CMake build system, big pile of libs: bspatch, quazip, java, the launcher

13 files changed, 5564 insertions, 0 deletions

diff --git a/patchlib/CMakeLists.txt b/patchlib/CMakeLists.txt
new file mode 100644
index 00000000..4130e08f
--- /dev/null
+++ b/patchlib/CMakeLists.txt
@@ -0,0 +1,14 @@
+project(patchlib C)
+
+set(SRCS 
+blocksort.c
+huffman.c
+crctable.c
+randtable.c
+compress.c
+decompress.c
+bzlib.c
+bspatch.c
+)
+
+add_library(patchlib STATIC ${SRCS})
diff --git a/patchlib/LICENSE-bzip2 b/patchlib/LICENSE-bzip2
new file mode 100644
index 00000000..cc614178
--- /dev/null
+++ b/patchlib/LICENSE-bzip2
@@ -0,0 +1,42 @@
+
+--------------------------------------------------------------------------
+
+This program, "bzip2", the associated library "libbzip2", and all
+documentation, are copyright (C) 1996-2010 Julian R Seward.  All
+rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. The origin of this software must not be misrepresented; you must 
+   not claim that you wrote the original software.  If you use this 
+   software in a product, an acknowledgment in the product 
+   documentation would be appreciated but is not required.
+
+3. Altered source versions must be plainly marked as such, and must
+   not be misrepresented as being the original software.
+
+4. The name of the author may not be used to endorse or promote 
+   products derived from this software without specific prior written 
+   permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Julian Seward, jseward@bzip.org
+bzip2/libbzip2 version 1.0.6 of 6 September 2010
+
+--------------------------------------------------------------------------
diff --git a/patchlib/blocksort.c b/patchlib/blocksort.c
new file mode 100644
index 00000000..d63dbbf8
--- /dev/null
+++ b/patchlib/blocksort.c
@@ -0,0 +1,1095 @@
+
+/*-------------------------------------------------------------*/
+/*--- Block sorting machinery                               ---*/
+/*---                                           blocksort.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include "bzlib_private.h"
+
+/*---------------------------------------------*/
+/*--- Fallback O(N log(N)^2) sorting        ---*/
+/*--- algorithm, for repetitive blocks      ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static 
+__inline__
+void fallbackSimpleSort ( UInt32* fmap, 
+                          UInt32* eclass, 
+                          Int32   lo, 
+                          Int32   hi )
+{
+   Int32 i, j, tmp;
+   UInt32 ec_tmp;
+
+   if (lo == hi) return;
+
+   if (hi - lo > 3) {
+      for ( i = hi-4; i >= lo; i-- ) {
+         tmp = fmap[i];
+         ec_tmp = eclass[tmp];
+         for ( j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4 )
+            fmap[j-4] = fmap[j];
+         fmap[j-4] = tmp;
+      }
+   }
+
+   for ( i = hi-1; i >= lo; i-- ) {
+      tmp = fmap[i];
+      ec_tmp = eclass[tmp];
+      for ( j = i+1; j <= hi && ec_tmp > eclass[fmap[j]]; j++ )
+         fmap[j-1] = fmap[j];
+      fmap[j-1] = tmp;
+   }
+}
+
+
+/*---------------------------------------------*/
+#define fswap(zz1, zz2) \
+   { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
+
+#define fvswap(zzp1, zzp2, zzn)       \
+{                                     \
+   Int32 yyp1 = (zzp1);               \
+   Int32 yyp2 = (zzp2);               \
+   Int32 yyn  = (zzn);                \
+   while (yyn > 0) {                  \
+      fswap(fmap[yyp1], fmap[yyp2]);  \
+      yyp1++; yyp2++; yyn--;          \
+   }                                  \
+}
+
+
+#define fmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define fpush(lz,hz) { stackLo[sp] = lz; \
+                       stackHi[sp] = hz; \
+                       sp++; }
+
+#define fpop(lz,hz) { sp--;              \
+                      lz = stackLo[sp];  \
+                      hz = stackHi[sp]; }
+
+#define FALLBACK_QSORT_SMALL_THRESH 10
+#define FALLBACK_QSORT_STACK_SIZE   100
+
+
+static
+void fallbackQSort3 ( UInt32* fmap, 
+                      UInt32* eclass,
+                      Int32   loSt, 
+                      Int32   hiSt )
+{
+   Int32 unLo, unHi, ltLo, gtHi, n, m;
+   Int32 sp, lo, hi;
+   UInt32 med, r, r3;
+   Int32 stackLo[FALLBACK_QSORT_STACK_SIZE];
+   Int32 stackHi[FALLBACK_QSORT_STACK_SIZE];
+
+   r = 0;
+
+   sp = 0;
+   fpush ( loSt, hiSt );
+
+   while (sp > 0) {
+
+      AssertH ( sp < FALLBACK_QSORT_STACK_SIZE - 1, 1004 );
+
+      fpop ( lo, hi );
+      if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) {
+         fallbackSimpleSort ( fmap, eclass, lo, hi );
+         continue;
+      }
+
+      /* Random partitioning.  Median of 3 sometimes fails to
+         avoid bad cases.  Median of 9 seems to help but 
+         looks rather expensive.  This too seems to work but
+         is cheaper.  Guidance for the magic constants 
+         7621 and 32768 is taken from Sedgewick's algorithms
+         book, chapter 35.
+      */
+      r = ((r * 7621) + 1) % 32768;
+      r3 = r % 3;
+      if (r3 == 0) med = eclass[fmap[lo]]; else
+      if (r3 == 1) med = eclass[fmap[(lo+hi)>>1]]; else
+                   med = eclass[fmap[hi]];
+
+      unLo = ltLo = lo;
+      unHi = gtHi = hi;
+
+      while (1) {
+         while (1) {
+            if (unLo > unHi) break;
+            n = (Int32)eclass[fmap[unLo]] - (Int32)med;
+            if (n == 0) { 
+               fswap(fmap[unLo], fmap[ltLo]); 
+               ltLo++; unLo++; 
+               continue; 
+            };
+            if (n > 0) break;
+            unLo++;
+         }
+         while (1) {
+            if (unLo > unHi) break;
+            n = (Int32)eclass[fmap[unHi]] - (Int32)med;
+            if (n == 0) { 
+               fswap(fmap[unHi], fmap[gtHi]); 
+               gtHi--; unHi--; 
+               continue; 
+            };
+            if (n < 0) break;
+            unHi--;
+         }
+         if (unLo > unHi) break;
+         fswap(fmap[unLo], fmap[unHi]); unLo++; unHi--;
+      }
+
+      AssertD ( unHi == unLo-1, "fallbackQSort3(2)" );
+
+      if (gtHi < ltLo) continue;
+
+      n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n);
+      m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m);
+
+      n = lo + unLo - ltLo - 1;
+      m = hi - (gtHi - unHi) + 1;
+
+      if (n - lo > hi - m) {
+         fpush ( lo, n );
+         fpush ( m, hi );
+      } else {
+         fpush ( m, hi );
+         fpush ( lo, n );
+      }
+   }
+}
+
+#undef fmin
+#undef fpush
+#undef fpop
+#undef fswap
+#undef fvswap
+#undef FALLBACK_QSORT_SMALL_THRESH
+#undef FALLBACK_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > 0
+      eclass exists for [0 .. nblock-1]
+      ((UChar*)eclass) [0 .. nblock-1] holds block
+      ptr exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)eclass) [0 .. nblock-1] holds block
+      All other areas of eclass destroyed
+      fmap [0 .. nblock-1] holds sorted order
+      bhtab [ 0 .. 2+(nblock/32) ] destroyed
+*/
+
+#define       SET_BH(zz)  bhtab[(zz) >> 5] |= (1 << ((zz) & 31))
+#define     CLEAR_BH(zz)  bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31))
+#define     ISSET_BH(zz)  (bhtab[(zz) >> 5] & (1 << ((zz) & 31)))
+#define      WORD_BH(zz)  bhtab[(zz) >> 5]
+#define UNALIGNED_BH(zz)  ((zz) & 0x01f)
+
+static
+void fallbackSort ( UInt32* fmap, 
+                    UInt32* eclass, 
+                    UInt32* bhtab,
+                    Int32   nblock,
+                    Int32   verb )
+{
+   Int32 ftab[257];
+   Int32 ftabCopy[256];
+   Int32 H, i, j, k, l, r, cc, cc1;
+   Int32 nNotDone;
+   Int32 nBhtab;
+   UChar* eclass8 = (UChar*)eclass;
+
+   /*--
+      Initial 1-char radix sort to generate
+      initial fmap and initial BH bits.
+   --*/
+   if (verb >= 4)
+      VPrintf0 ( "        bucket sorting ...\n" );
+   for (i = 0; i < 257;    i++) ftab[i] = 0;
+   for (i = 0; i < nblock; i++) ftab[eclass8[i]]++;
+   for (i = 0; i < 256;    i++) ftabCopy[i] = ftab[i];
+   for (i = 1; i < 257;    i++) ftab[i] += ftab[i-1];
+
+   for (i = 0; i < nblock; i++) {
+      j = eclass8[i];
+      k = ftab[j] - 1;
+      ftab[j] = k;
+      fmap[k] = i;
+   }
+
+   nBhtab = 2 + (nblock / 32);
+   for (i = 0; i < nBhtab; i++) bhtab[i] = 0;
+   for (i = 0; i < 256; i++) SET_BH(ftab[i]);
+
+   /*--
+      Inductively refine the buckets.  Kind-of an
+      "exponential radix sort" (!), inspired by the
+      Manber-Myers suffix array construction algorithm.
+   --*/
+
+   /*-- set sentinel bits for block-end detection --*/
+   for (i = 0; i < 32; i++) { 
+      SET_BH(nblock + 2*i);
+      CLEAR_BH(nblock + 2*i + 1);
+   }
+
+   /*-- the log(N) loop --*/
+   H = 1;
+   while (1) {
+
+      if (verb >= 4) 
+         VPrintf1 ( "        depth %6d has ", H );
+
+      j = 0;
+      for (i = 0; i < nblock; i++) {
+         if (ISSET_BH(i)) j = i;
+         k = fmap[i] - H; if (k < 0) k += nblock;
+         eclass[k] = j;
+      }
+
+      nNotDone = 0;
+      r = -1;
+      while (1) {
+
+	 /*-- find the next non-singleton bucket --*/
+         k = r + 1;
+         while (ISSET_BH(k) && UNALIGNED_BH(k)) k++;
+         if (ISSET_BH(k)) {
+            while (WORD_BH(k) == 0xffffffff) k += 32;
+            while (ISSET_BH(k)) k++;
+         }
+         l = k - 1;
+         if (l >= nblock) break;
+         while (!ISSET_BH(k) && UNALIGNED_BH(k)) k++;
+         if (!ISSET_BH(k)) {
+            while (WORD_BH(k) == 0x00000000) k += 32;
+            while (!ISSET_BH(k)) k++;
+         }
+         r = k - 1;
+         if (r >= nblock) break;
+
+         /*-- now [l, r] bracket current bucket --*/
+         if (r > l) {
+            nNotDone += (r - l + 1);
+            fallbackQSort3 ( fmap, eclass, l, r );
+
+            /*-- scan bucket and generate header bits-- */
+            cc = -1;
+            for (i = l; i <= r; i++) {
+               cc1 = eclass[fmap[i]];
+               if (cc != cc1) { SET_BH(i); cc = cc1; };
+            }
+         }
+      }
+
+      if (verb >= 4) 
+         VPrintf1 ( "%6d unresolved strings\n", nNotDone );
+
+      H *= 2;
+      if (H > nblock || nNotDone == 0) break;
+   }
+
+   /*-- 
+      Reconstruct the original block in
+      eclass8 [0 .. nblock-1], since the
+      previous phase destroyed it.
+   --*/
+   if (verb >= 4)
+      VPrintf0 ( "        reconstructing block ...\n" );
+   j = 0;
+   for (i = 0; i < nblock; i++) {
+      while (ftabCopy[j] == 0) j++;
+      ftabCopy[j]--;
+      eclass8[fmap[i]] = (UChar)j;
+   }
+   AssertH ( j < 256, 1005 );
+}
+
+#undef       SET_BH
+#undef     CLEAR_BH
+#undef     ISSET_BH
+#undef      WORD_BH
+#undef UNALIGNED_BH
+
+
+/*---------------------------------------------*/
+/*--- The main, O(N^2 log(N)) sorting       ---*/
+/*--- algorithm.  Faster for "normal"       ---*/
+/*--- non-repetitive blocks.                ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+__inline__
+Bool mainGtU ( UInt32  i1, 
+               UInt32  i2,
+               UChar*  block, 
+               UInt16* quadrant,
+               UInt32  nblock,
+               Int32*  budget )
+{
+   Int32  k;
+   UChar  c1, c2;
+   UInt16 s1, s2;
+
+   AssertD ( i1 != i2, "mainGtU" );
+   /* 1 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 2 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 3 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 4 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 5 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 6 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 7 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 8 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 9 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 10 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 11 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 12 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+
+   k = nblock + 8;
+
+   do {
+      /* 1 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 2 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 3 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 4 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 5 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 6 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 7 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 8 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+
+      if (i1 >= nblock) i1 -= nblock;
+      if (i2 >= nblock) i2 -= nblock;
+
+      k -= 8;
+      (*budget)--;
+   }
+      while (k >= 0);
+
+   return False;
+}
+
+
+/*---------------------------------------------*/
+/*--
+   Knuth's increments seem to work better
+   than Incerpi-Sedgewick here.  Possibly
+   because the number of elems to sort is
+   usually small, typically <= 20.
+--*/
+static
+Int32 incs[14] = { 1, 4, 13, 40, 121, 364, 1093, 3280,
+                   9841, 29524, 88573, 265720,
+                   797161, 2391484 };
+
+static
+void mainSimpleSort ( UInt32* ptr,
+                      UChar*  block,
+                      UInt16* quadrant,
+                      Int32   nblock,
+                      Int32   lo, 
+                      Int32   hi, 
+                      Int32   d,
+                      Int32*  budget )
+{
+   Int32 i, j, h, bigN, hp;
+   UInt32 v;
+
+   bigN = hi - lo + 1;
+   if (bigN < 2) return;
+
+   hp = 0;
+   while (incs[hp] < bigN) hp++;
+   hp--;
+
+   for (; hp >= 0; hp--) {
+      h = incs[hp];
+
+      i = lo + h;
+      while (True) {
+
+         /*-- copy 1 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         /*-- copy 2 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         /*-- copy 3 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         if (*budget < 0) return;
+      }
+   }
+}
+
+
+/*---------------------------------------------*/
+/*--
+   The following is an implementation of
+   an elegant 3-way quicksort for strings,
+   described in a paper "Fast Algorithms for
+   Sorting and Searching Strings", by Robert
+   Sedgewick and Jon L. Bentley.
+--*/
+
+#define mswap(zz1, zz2) \
+   { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
+
+#define mvswap(zzp1, zzp2, zzn)       \
+{                                     \
+   Int32 yyp1 = (zzp1);               \
+   Int32 yyp2 = (zzp2);               \
+   Int32 yyn  = (zzn);                \
+   while (yyn > 0) {                  \
+      mswap(ptr[yyp1], ptr[yyp2]);    \
+      yyp1++; yyp2++; yyn--;          \
+   }                                  \
+}
+
+static 
+__inline__
+UChar mmed3 ( UChar a, UChar b, UChar c )
+{
+   UChar t;
+   if (a > b) { t = a; a = b; b = t; };
+   if (b > c) { 
+      b = c;
+      if (a > b) b = a;
+   }
+   return b;
+}
+
+#define mmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define mpush(lz,hz,dz) { stackLo[sp] = lz; \
+                          stackHi[sp] = hz; \
+                          stackD [sp] = dz; \
+                          sp++; }
+
+#define mpop(lz,hz,dz) { sp--;             \
+                         lz = stackLo[sp]; \
+                         hz = stackHi[sp]; \
+                         dz = stackD [sp]; }
+
+
+#define mnextsize(az) (nextHi[az]-nextLo[az])
+
+#define mnextswap(az,bz)                                        \
+   { Int32 tz;                                                  \
+     tz = nextLo[az]; nextLo[az] = nextLo[bz]; nextLo[bz] = tz; \
+     tz = nextHi[az]; nextHi[az] = nextHi[bz]; nextHi[bz] = tz; \
+     tz = nextD [az]; nextD [az] = nextD [bz]; nextD [bz] = tz; }
+
+
+#define MAIN_QSORT_SMALL_THRESH 20
+#define MAIN_QSORT_DEPTH_THRESH (BZ_N_RADIX + BZ_N_QSORT)
+#define MAIN_QSORT_STACK_SIZE 100
+
+static
+void mainQSort3 ( UInt32* ptr,
+                  UChar*  block,
+                  UInt16* quadrant,
+                  Int32   nblock,
+                  Int32   loSt, 
+                  Int32   hiSt, 
+                  Int32   dSt,
+                  Int32*  budget )
+{
+   Int32 unLo, unHi, ltLo, gtHi, n, m, med;
+   Int32 sp, lo, hi, d;
+
+   Int32 stackLo[MAIN_QSORT_STACK_SIZE];
+   Int32 stackHi[MAIN_QSORT_STACK_SIZE];
+   Int32 stackD [MAIN_QSORT_STACK_SIZE];
+
+   Int32 nextLo[3];
+   Int32 nextHi[3];
+   Int32 nextD [3];
+
+   sp = 0;
+   mpush ( loSt, hiSt, dSt );
+
+   while (sp > 0) {
+
+      AssertH ( sp < MAIN_QSORT_STACK_SIZE - 2, 1001 );
+
+      mpop ( lo, hi, d );
+      if (hi - lo < MAIN_QSORT_SMALL_THRESH || 
+          d > MAIN_QSORT_DEPTH_THRESH) {
+         mainSimpleSort ( ptr, block, quadrant, nblock, lo, hi, d, budget );
+         if (*budget < 0) return;
+         continue;
+      }
+
+      med = (Int32) 
+            mmed3 ( block[ptr[ lo         ]+d],
+                    block[ptr[ hi         ]+d],
+                    block[ptr[ (lo+hi)>>1 ]+d] );
+
+      unLo = ltLo = lo;
+      unHi = gtHi = hi;
+
+      while (True) {
+         while (True) {
+            if (unLo > unHi) break;
+            n = ((Int32)block[ptr[unLo]+d]) - med;
+            if (n == 0) { 
+               mswap(ptr[unLo], ptr[ltLo]); 
+               ltLo++; unLo++; continue; 
+            };
+            if (n >  0) break;
+            unLo++;
+         }
+         while (True) {
+            if (unLo > unHi) break;
+            n = ((Int32)block[ptr[unHi]+d]) - med;
+            if (n == 0) { 
+               mswap(ptr[unHi], ptr[gtHi]); 
+               gtHi--; unHi--; continue; 
+            };
+            if (n <  0) break;
+            unHi--;
+         }
+         if (unLo > unHi) break;
+         mswap(ptr[unLo], ptr[unHi]); unLo++; unHi--;
+      }
+
+      AssertD ( unHi == unLo-1, "mainQSort3(2)" );
+
+      if (gtHi < ltLo) {
+         mpush(lo, hi, d+1 );
+         continue;
+      }
+
+      n = mmin(ltLo-lo, unLo-ltLo); mvswap(lo, unLo-n, n);
+      m = mmin(hi-gtHi, gtHi-unHi); mvswap(unLo, hi-m+1, m);
+
+      n = lo + unLo - ltLo - 1;
+      m = hi - (gtHi - unHi) + 1;
+
+      nextLo[0] = lo;  nextHi[0] = n;   nextD[0] = d;
+      nextLo[1] = m;   nextHi[1] = hi;  nextD[1] = d;
+      nextLo[2] = n+1; nextHi[2] = m-1; nextD[2] = d+1;
+
+      if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+      if (mnextsize(1) < mnextsize(2)) mnextswap(1,2);
+      if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+
+      AssertD (mnextsize(0) >= mnextsize(1), "mainQSort3(8)" );
+      AssertD (mnextsize(1) >= mnextsize(2), "mainQSort3(9)" );
+
+      mpush (nextLo[0], nextHi[0], nextD[0]);
+      mpush (nextLo[1], nextHi[1], nextD[1]);
+      mpush (nextLo[2], nextHi[2], nextD[2]);
+   }
+}
+
+#undef mswap
+#undef mvswap
+#undef mpush
+#undef mpop
+#undef mmin
+#undef mnextsize
+#undef mnextswap
+#undef MAIN_QSORT_SMALL_THRESH
+#undef MAIN_QSORT_DEPTH_THRESH
+#undef MAIN_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > N_OVERSHOOT
+      block32 exists for [0 .. nblock-1 +N_OVERSHOOT]
+      ((UChar*)block32) [0 .. nblock-1] holds block
+      ptr exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)block32) [0 .. nblock-1] holds block
+      All other areas of block32 destroyed
+      ftab [0 .. 65536 ] destroyed
+      ptr [0 .. nblock-1] holds sorted order
+      if (*budget < 0), sorting was abandoned
+*/
+
+#define BIGFREQ(b) (ftab[((b)+1) << 8] - ftab[(b) << 8])
+#define SETMASK (1 << 21)
+#define CLEARMASK (~(SETMASK))
+
+static
+void mainSort ( UInt32* ptr, 
+                UChar*  block,
+                UInt16* quadrant, 
+                UInt32* ftab,
+                Int32   nblock,
+                Int32   verb,
+                Int32*  budget )
+{
+   Int32  i, j, k, ss, sb;
+   Int32  runningOrder[256];
+   Bool   bigDone[256];
+   Int32  copyStart[256];
+   Int32  copyEnd  [256];
+   UChar  c1;
+   Int32  numQSorted;
+   UInt16 s;
+   if (verb >= 4) VPrintf0 ( "        main sort initialise ...\n" );
+
+   /*-- set up the 2-byte frequency table --*/
+   for (i = 65536; i >= 0; i--) ftab[i] = 0;
+
+   j = block[0] << 8;
+   i = nblock-1;
+   for (; i >= 3; i -= 4) {
+      quadrant[i] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i]) << 8);
+      ftab[j]++;
+      quadrant[i-1] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-1]) << 8);
+      ftab[j]++;
+      quadrant[i-2] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-2]) << 8);
+      ftab[j]++;
+      quadrant[i-3] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-3]) << 8);
+      ftab[j]++;
+   }
+   for (; i >= 0; i--) {
+      quadrant[i] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i]) << 8);
+      ftab[j]++;
+   }
+
+   /*-- (emphasises close relationship of block & quadrant) --*/
+   for (i = 0; i < BZ_N_OVERSHOOT; i++) {
+      block   [nblock+i] = block[i];
+      quadrant[nblock+i] = 0;
+   }
+
+   if (verb >= 4) VPrintf0 ( "        bucket sorting ...\n" );
+
+   /*-- Complete the initial radix sort --*/
+   for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1];
+
+   s = block[0] << 8;
+   i = nblock-1;
+   for (; i >= 3; i -= 4) {
+      s = (s >> 8) | (block[i] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i;
+      s = (s >> 8) | (block[i-1] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-1;
+      s = (s >> 8) | (block[i-2] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-2;
+      s = (s >> 8) | (block[i-3] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-3;
+   }
+   for (; i >= 0; i--) {
+      s = (s >> 8) | (block[i] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i;
+   }
+
+   /*--
+      Now ftab contains the first loc of every small bucket.
+      Calculate the running order, from smallest to largest
+      big bucket.
+   --*/
+   for (i = 0; i <= 255; i++) {
+      bigDone     [i] = False;
+      runningOrder[i] = i;
+   }
+
+   {
+      Int32 vv;
+      Int32 h = 1;
+      do h = 3 * h + 1; while (h <= 256);
+      do {
+         h = h / 3;
+         for (i = h; i <= 255; i++) {
+            vv = runningOrder[i];
+            j = i;
+            while ( BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv) ) {
+               runningOrder[j] = runningOrder[j-h];
+               j = j - h;
+               if (j <= (h - 1)) goto zero;
+            }
+            zero:
+            runningOrder[j] = vv;
+         }
+      } while (h != 1);
+   }
+
+   /*--
+      The main sorting loop.
+   --*/
+
+   numQSorted = 0;
+
+   for (i = 0; i <= 255; i++) {
+
+      /*--
+         Process big buckets, starting with the least full.
+         Basically this is a 3-step process in which we call
+         mainQSort3 to sort the small buckets [ss, j], but
+         also make a big effort to avoid the calls if we can.
+      --*/
+      ss = runningOrder[i];
+
+      /*--
+         Step 1:
+         Complete the big bucket [ss] by quicksorting
+         any unsorted small buckets [ss, j], for j != ss.  
+         Hopefully previous pointer-scanning phases have already
+         completed many of the small buckets [ss, j], so
+         we don't have to sort them at all.
+      --*/
+      for (j = 0; j <= 255; j++) {
+         if (j != ss) {
+            sb = (ss << 8) + j;
+            if ( ! (ftab[sb] & SETMASK) ) {
+               Int32 lo = ftab[sb]   & CLEARMASK;
+               Int32 hi = (ftab[sb+1] & CLEARMASK) - 1;
+               if (hi > lo) {
+                  if (verb >= 4)
+                     VPrintf4 ( "        qsort [0x%x, 0x%x]   "
+                                "done %d   this %d\n",
+                                ss, j, numQSorted, hi - lo + 1 );
+                  mainQSort3 ( 
+                     ptr, block, quadrant, nblock, 
+                     lo, hi, BZ_N_RADIX, budget 
+                  );   
+                  numQSorted += (hi - lo + 1);
+                  if (*budget < 0) return;
+               }
+            }
+            ftab[sb] |= SETMASK;
+         }
+      }
+
+      AssertH ( !bigDone[ss], 1006 );
+
+      /*--
+         Step 2:
+         Now scan this big bucket [ss] so as to synthesise the
+         sorted order for small buckets [t, ss] for all t,
+         including, magically, the bucket [ss,ss] too.
+         This will avoid doing Real Work in subsequent Step 1's.
+      --*/
+      {
+         for (j = 0; j <= 255; j++) {
+            copyStart[j] =  ftab[(j << 8) + ss]     & CLEARMASK;
+            copyEnd  [j] = (ftab[(j << 8) + ss + 1] & CLEARMASK) - 1;
+         }
+         for (j = ftab[ss << 8] & CLEARMASK; j < copyStart[ss]; j++) {
+            k = ptr[j]-1; if (k < 0) k += nblock;
+            c1 = block[k];
+            if (!bigDone[c1])
+               ptr[ copyStart[c1]++ ] = k;
+         }
+         for (j = (ftab[(ss+1) << 8] & CLEARMASK) - 1; j > copyEnd[ss]; j--) {
+            k = ptr[j]-1; if (k < 0) k += nblock;
+            c1 = block[k];
+            if (!bigDone[c1]) 
+               ptr[ copyEnd[c1]-- ] = k;
+         }
+      }
+
+      AssertH ( (copyStart[ss]-1 == copyEnd[ss])
+                || 
+                /* Extremely rare case missing in bzip2-1.0.0 and 1.0.1.
+                   Necessity for this case is demonstrated by compressing 
+                   a sequence of approximately 48.5 million of character 
+                   251; 1.0.0/1.0.1 will then die here. */
+                (copyStart[ss] == 0 && copyEnd[ss] == nblock-1),
+                1007 )
+
+      for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK;
+
+      /*--
+         Step 3:
+         The [ss] big bucket is now done.  Record this fact,
+         and update the quadrant descriptors.  Remember to
+         update quadrants in the overshoot area too, if
+         necessary.  The "if (i < 255)" test merely skips
+         this updating for the last bucket processed, since
+         updating for the last bucket is pointless.
+
+         The quadrant array provides a way to incrementally
+         cache sort orderings, as they appear, so as to 
+         make subsequent comparisons in fullGtU() complete
+         faster.  For repetitive blocks this makes a big
+         difference (but not big enough to be able to avoid
+         the fallback sorting mechanism, exponential radix sort).
+
+         The precise meaning is: at all times:
+
+            for 0 <= i < nblock and 0 <= j <= nblock
+
+            if block[i] != block[j], 
+
+               then the relative values of quadrant[i] and 
+                    quadrant[j] are meaningless.
+
+               else {
+                  if quadrant[i] < quadrant[j]
+                     then the string starting at i lexicographically
+                     precedes the string starting at j
+
+                  else if quadrant[i] > quadrant[j]
+                     then the string starting at j lexicographically
+                     precedes the string starting at i
+
+                  else
+                     the relative ordering of the strings starting
+                     at i and j has not yet been determined.
+               }
+      --*/
+      bigDone[ss] = True;
+
+      if (i < 255) {
+         Int32 bbStart  = ftab[ss << 8] & CLEARMASK;
+         Int32 bbSize   = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart;
+         Int32 shifts   = 0;
+
+         while ((bbSize >> shifts) > 65534) shifts++;
+
+         for (j = bbSize-1; j >= 0; j--) {
+            Int32 a2update     = ptr[bbStart + j];
+            UInt16 qVal        = (UInt16)(j >> shifts);
+            quadrant[a2update] = qVal;
+            if (a2update < BZ_N_OVERSHOOT)
+               quadrant[a2update + nblock] = qVal;
+         }
+         AssertH ( ((bbSize-1) >> shifts) <= 65535, 1002 );
+      }
+
+   }
+
+   if (verb >= 4)
+      VPrintf3 ( "        %d pointers, %d sorted, %d scanned\n",
+                 nblock, numQSorted, nblock - numQSorted );
+}
+
+#undef BIGFREQ
+#undef SETMASK
+#undef CLEARMASK
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > 0
+      arr2 exists for [0 .. nblock-1 +N_OVERSHOOT]
+      ((UChar*)arr2)  [0 .. nblock-1] holds block
+      arr1 exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)arr2) [0 .. nblock-1] holds block
+      All other areas of block destroyed
+      ftab [ 0 .. 65536 ] destroyed
+      arr1 [0 .. nblock-1] holds sorted order
+*/
+void BZ2_blockSort ( EState* s )
+{
+   UInt32* ptr    = s->ptr; 
+   UChar*  block  = s->block;
+   UInt32* ftab   = s->ftab;
+   Int32   nblock = s->nblock;
+   Int32   verb   = s->verbosity;
+   Int32   wfact  = s->workFactor;
+   UInt16* quadrant;
+   Int32   budget;
+   Int32   budgetInit;
+   Int32   i;
+
+   if (nblock < 10000) {
+      fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
+   } else {
+      /* Calculate the location for quadrant, remembering to get
+         the alignment right.  Assumes that &(block[0]) is at least
+         2-byte aligned -- this should be ok since block is really
+         the first section of arr2.
+      */
+      i = nblock+BZ_N_OVERSHOOT;
+      if (i & 1) i++;
+      quadrant = (UInt16*)(&(block[i]));
+
+      /* (wfact-1) / 3 puts the default-factor-30
+         transition point at very roughly the same place as 
+         with v0.1 and v0.9.0.  
+         Not that it particularly matters any more, since the
+         resulting compressed stream is now the same regardless
+         of whether or not we use the main sort or fallback sort.
+      */
+      if (wfact < 1  ) wfact = 1;
+      if (wfact > 100) wfact = 100;
+      budgetInit = nblock * ((wfact-1) / 3);
+      budget = budgetInit;
+
+      mainSort ( ptr, block, quadrant, ftab, nblock, verb, &budget );
+      if (verb >= 3) 
+         VPrintf3 ( "      %d work, %d block, ratio %5.2f\n",
+                    budgetInit - budget,
+                    nblock, 
+                    (float)(budgetInit - budget) /
+                    (float)(nblock==0 ? 1 : nblock) ); 
+      if (budget < 0) {
+         if (verb >= 2) 
+            VPrintf0 ( "    too repetitive; using fallback"
+                       " sorting algorithm\n" );
+         fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
+      }
+   }
+
+   s->origPtr = -1;
+   for (i = 0; i < s->nblock; i++)
+      if (ptr[i] == 0)
+         { s->origPtr = i; break; };
+
+   AssertH( s->origPtr != -1, 1003 );
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                       blocksort.c ---*/
+/*-------------------------------------------------------------*/
+
diff --git a/patchlib/bspatch.c b/patchlib/bspatch.c
new file mode 100644
index 00000000..e8469edc
--- /dev/null
+++ b/patchlib/bspatch.c
@@ -0,0 +1,303 @@
+/*-
+ * Copyright 2003-2005 Colin Percival
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions 
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef _MSC_VER
+	// bogus 'secure' nonsense
+	#define _CRT_SECURE_NO_WARNINGS
+	// bogus signed/unsigned mismatch
+	#pragma warning( disable: 4018)
+#endif
+
+#ifdef _WIN32
+	#include <sys/types.h>
+	#define ssize_t size_t
+#else
+	#include <unistd.h>
+#endif
+
+#if defined __APPLE__ && defined __MACH__
+	typedef unsigned char u_char;
+#endif
+
+#include "bzlib.h"
+#include "bspatch.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+static off_t offtin(u_char *buf)
+{
+	off_t y;
+
+	y=buf[7]&0x7F;
+	y=y*256;y+=buf[6];
+	y=y*256;y+=buf[5];
+	y=y*256;y+=buf[4];
+	y=y*256;y+=buf[3];
+	y=y*256;y+=buf[2];
+	y=y*256;y+=buf[1];
+	y=y*256;y+=buf[0];
+
+	if(buf[7]&0x80) y=-y;
+
+	return y;
+}
+
+int bspatch(const char * oldfile, const char * newfile, const char * patchfile)
+{
+	FILE * f, * cpf, * dpf, * epf;
+	BZFILE * cpfbz2, * dpfbz2, * epfbz2;
+	int cbz2err, dbz2err, ebz2err;
+	FILE * temp;
+	ssize_t oldsize,newsize;
+	ssize_t bzctrllen,bzdatalen;
+	unsigned char header[32],buf[8];
+	unsigned char *old_contents;
+	unsigned char *new_contents;
+	off_t oldpos,newpos;
+	off_t ctrl[3];
+	off_t lenread;
+	off_t i;
+
+	/* Open patch file */
+	if ((f = fopen(patchfile, "rb")) == NULL)
+	{
+		//err(1, "fopen(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+
+	/*
+	File format:
+		0	8	"BSDIFF40"
+		8	8	X
+		16	8	Y
+		24	8	sizeof(newfile)
+		32	X	bzip2(control block)
+		32+X	Y	bzip2(diff block)
+		32+X+Y	???	bzip2(extra block)
+	with control block a set of triples (x,y,z) meaning "add x bytes
+	from oldfile to x bytes from the diff block; copy y bytes from the
+	extra block; seek forwards in oldfile by z bytes".
+	*/
+
+	/* Read header */
+	if (fread(header, 1, 32, f) < 32)
+	{
+		if (feof(f))
+		{
+			//errx(1, "Corrupt patch\n");
+			return ERR_CORRUPT_PATCH;
+		}
+		//err(1, "fread(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+
+	/* Check for appropriate magic */
+	if (memcmp(header, "BSDIFF40", 8) != 0)
+	{
+		//errx(1, "Corrupt patch\n");
+		return ERR_CORRUPT_PATCH;
+	}
+
+	/* Read lengths from header */
+	bzctrllen=offtin(header+8);
+	bzdatalen=offtin(header+16);
+	newsize=offtin(header+24);
+	if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
+	{
+		//errx(1,"Corrupt patch\n");
+		return ERR_CORRUPT_PATCH;
+	}
+
+	/* Close patch file and re-open it via libbzip2 at the right places */
+	if (fclose(f))
+	{
+		//err(1, "fclose(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+	if ((cpf = fopen(patchfile, "rb")) == NULL)
+	{
+		//err(1, "fopen(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+	if (fseek(cpf, 32, SEEK_SET))
+	{
+		// err(1, "fseeko(%s, %lld)", argv[3], (long long)32);
+		return ERR_OTHER;
+	}
+	if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
+	{
+		//errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
+		return ERR_OTHER;
+	}
+	if ((dpf = fopen(patchfile, "rb")) == NULL)
+	{
+		//err(1, "fopen(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+	if (fseek(dpf, 32 + bzctrllen, SEEK_SET))
+	{
+		//err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen));
+		return ERR_OTHER;
+	}
+	if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
+	{
+		//errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
+		return ERR_OTHER;
+	}
+	if ((epf = fopen(patchfile, "rb")) == NULL)
+	{
+		//err(1, "fopen(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+	if (fseek(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
+	{
+		//err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen + bzdatalen));
+		return ERR_OTHER;
+	}
+	if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
+	{
+		//errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
+		return ERR_OTHER;
+	}
+
+	if((temp=fopen(oldfile,"rb")) == NULL)
+	{
+		return ERR_OTHER;
+	}
+	if((fseek(temp,0,SEEK_END))!=0)
+	{
+		return ERR_OTHER;
+	}
+	oldsize = ftell(temp);
+	if((old_contents=malloc(oldsize+1))==NULL)
+	{
+		return ERR_OTHER;
+	}
+	rewind(temp);
+	if(fread(old_contents,oldsize,1,temp)!=1)
+	{
+		return ERR_OTHER;
+	}
+	if(fclose(temp)==EOF)
+	{
+		return ERR_OTHER;
+	}
+	if((new_contents=malloc(newsize+1))==NULL)
+	{
+		//err(1,NULL);
+		return ERR_OTHER;
+	}
+
+	oldpos=0;newpos=0;
+	while(newpos<newsize)
+	{
+		/* Read control data */
+		for(i=0;i<=2;i++) {
+			lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
+			if ((lenread < 8) || ((cbz2err != BZ_OK) && (cbz2err != BZ_STREAM_END)))
+			{
+				//errx(1, "Corrupt patch\n");
+				return ERR_CORRUPT_PATCH;
+			}
+			ctrl[i]=offtin(buf);
+		};
+
+		/* Sanity-check */
+		if(newpos+ctrl[0]>newsize)
+		{
+			//errx(1,"Corrupt patch\n");
+			return ERR_CORRUPT_PATCH;
+		}
+
+		/* Read diff string */
+		lenread = BZ2_bzRead(&dbz2err, dpfbz2, new_contents + newpos, ctrl[0]);
+		if ((lenread < ctrl[0]) || ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
+		{
+			//errx(1, "Corrupt patch\n");
+			return ERR_CORRUPT_PATCH;
+		}
+
+		/* Add old data to diff string */
+		for(i=0;i<ctrl[0];i++)
+		{
+			if((oldpos+i>=0) && (oldpos+i<oldsize))
+			{
+				new_contents[newpos+i]+=old_contents[oldpos+i];
+			}
+		}
+
+		/* Adjust pointers */
+		newpos+=ctrl[0];
+		oldpos+=ctrl[0];
+
+		/* Sanity-check */
+		if(newpos+ctrl[1]>newsize)
+		{
+			//errx(1,"Corrupt patch\n");
+			return ERR_CORRUPT_PATCH;
+		}
+
+		/* Read extra string */
+		lenread = BZ2_bzRead(&ebz2err, epfbz2, new_contents + newpos, ctrl[1]);
+		if ((lenread < ctrl[1]) || ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
+		{
+			//errx(1, "Corrupt patch\n");
+			return ERR_CORRUPT_PATCH;
+		}
+
+		/* Adjust pointers */
+		newpos+=ctrl[1];
+		oldpos+=ctrl[2];
+	};
+
+	/* Clean up the bzip2 reads */
+	BZ2_bzReadClose(&cbz2err, cpfbz2);
+	BZ2_bzReadClose(&dbz2err, dpfbz2);
+	BZ2_bzReadClose(&ebz2err, epfbz2);
+	if (fclose(cpf) || fclose(dpf) || fclose(epf))
+	{
+		//err(1, "fclose(%s)", argv[3]);
+		return ERR_OTHER;
+	}
+
+	/* Write the new file */
+	if(
+		((temp=fopen(newfile,"wb"))==NULL) ||
+		(fwrite(new_contents,newsize,1,temp)==0) ||
+		(fclose(temp)==EOF)
+	)
+	{
+		//err(1,"%s",argv[2]);
+		return ERR_OTHER;
+	}
+
+	free(new_contents);
+	free(old_contents);
+
+	return ERR_NONE;
+}
diff --git a/patchlib/bspatch.h b/patchlib/bspatch.h
new file mode 100644
index 00000000..efb83ee5
--- /dev/null
+++ b/patchlib/bspatch.h
@@ -0,0 +1,27 @@
+#ifndef _BSPATCH_H
+#define _BSPATCH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum BSPatchError
+{
+	ERR_CORRUPT_PATCH,
+	ERR_OTHER,
+	ERR_NONE,
+};
+
+/**
+ * patch oldfile by using patchfile and write the output to newfile.
+ *
+ * Returns ERR_NONE if successful
+ */
+int bspatch(const char * oldfile, const char * newfile, const char * patchfile);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
diff --git a/patchlib/bzlib.c b/patchlib/bzlib.c
new file mode 100644
index 00000000..e2994b44
--- /dev/null
+++ b/patchlib/bzlib.c
@@ -0,0 +1,1579 @@
+
+/*-------------------------------------------------------------*/
+/*--- Library top-level functions.                          ---*/
+/*---                                               bzlib.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+/* CHANGES
+   0.9.0    -- original version.
+   0.9.0a/b -- no changes in this file.
+   0.9.0c   -- made zero-length BZ_FLUSH work correctly in bzCompress().
+     fixed bzWrite/bzRead to ignore zero-length requests.
+     fixed bzread to correctly handle read requests after EOF.
+     wrong parameter order in call to bzDecompressInit in
+     bzBuffToBuffDecompress.  Fixed.
+*/
+
+#ifdef _MSC_VER
+	//'function': was declared deprecated
+	#define _CRT_SECURE_NO_DEPRECATE
+	#define _SCL_SECURE_NO_DEPRECATE
+	#pragma warning( disable: 4996 )
+#endif
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+/*--- Compression stuff                           ---*/
+/*---------------------------------------------------*/
+
+
+/*---------------------------------------------------*/
+#ifndef BZ_NO_STDIO
+void BZ2_bz__AssertH__fail ( int errcode )
+{
+   fprintf(stderr, 
+      "\n\nbzip2/libbzip2: internal error number %d.\n"
+      "This is a bug in bzip2/libbzip2, %s.\n"
+      "Please report it to me at: jseward@bzip.org.  If this happened\n"
+      "when you were using some program which uses libbzip2 as a\n"
+      "component, you should also report this bug to the author(s)\n"
+      "of that program.  Please make an effort to report this bug;\n"
+      "timely and accurate bug reports eventually lead to higher\n"
+      "quality software.  Thanks.  Julian Seward, 10 December 2007.\n\n",
+      errcode,
+      BZ2_bzlibVersion()
+   );
+
+   if (errcode == 1007) {
+   fprintf(stderr,
+      "\n*** A special note about internal error number 1007 ***\n"
+      "\n"
+      "Experience suggests that a common cause of i.e. 1007\n"
+      "is unreliable memory or other hardware.  The 1007 assertion\n"
+      "just happens to cross-check the results of huge numbers of\n"
+      "memory reads/writes, and so acts (unintendedly) as a stress\n"
+      "test of your memory system.\n"
+      "\n"
+      "I suggest the following: try compressing the file again,\n"
+      "possibly monitoring progress in detail with the -vv flag.\n"
+      "\n"
+      "* If the error cannot be reproduced, and/or happens at different\n"
+      "  points in compression, you may have a flaky memory system.\n"
+      "  Try a memory-test program.  I have used Memtest86\n"
+      "  (www.memtest86.com).  At the time of writing it is free (GPLd).\n"
+      "  Memtest86 tests memory much more thorougly than your BIOSs\n"
+      "  power-on test, and may find failures that the BIOS doesn't.\n"
+      "\n"
+      "* If the error can be repeatably reproduced, this is a bug in\n"
+      "  bzip2, and I would very much like to hear about it.  Please\n"
+      "  let me know, and, ideally, save a copy of the file causing the\n"
+      "  problem -- without which I will be unable to investigate it.\n"
+      "\n"
+   );
+   }
+
+   exit(3);
+}
+#endif
+
+
+/*---------------------------------------------------*/
+static
+int bz_config_ok ( void )
+{
+   if (sizeof(int)   != 4) return 0;
+   if (sizeof(short) != 2) return 0;
+   if (sizeof(char)  != 1) return 0;
+   return 1;
+}
+
+
+/*---------------------------------------------------*/
+static
+void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
+{
+   void* v = malloc ( items * size );
+   return v;
+}
+
+static
+void default_bzfree ( void* opaque, void* addr )
+{
+   if (addr != NULL) free ( addr );
+}
+
+
+/*---------------------------------------------------*/
+static
+void prepare_new_block ( EState* s )
+{
+   Int32 i;
+   s->nblock = 0;
+   s->numZ = 0;
+   s->state_out_pos = 0;
+   BZ_INITIALISE_CRC ( s->blockCRC );
+   for (i = 0; i < 256; i++) s->inUse[i] = False;
+   s->blockNo++;
+}
+
+
+/*---------------------------------------------------*/
+static
+void init_RL ( EState* s )
+{
+   s->state_in_ch  = 256;
+   s->state_in_len = 0;
+}
+
+
+static
+Bool isempty_RL ( EState* s )
+{
+   if (s->state_in_ch < 256 && s->state_in_len > 0)
+      return False; else
+      return True;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressInit) 
+                    ( bz_stream* strm, 
+                     int        blockSize100k,
+                     int        verbosity,
+                     int        workFactor )
+{
+   Int32   n;
+   EState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL || 
+       blockSize100k < 1 || blockSize100k > 9 ||
+       workFactor < 0 || workFactor > 250)
+     return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(EState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm = strm;
+
+   s->arr1 = NULL;
+   s->arr2 = NULL;
+   s->ftab = NULL;
+
+   n       = 100000 * blockSize100k;
+   s->arr1 = BZALLOC( n                  * sizeof(UInt32) );
+   s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
+   s->ftab = BZALLOC( 65537              * sizeof(UInt32) );
+
+   if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
+      if (s->arr1 != NULL) BZFREE(s->arr1);
+      if (s->arr2 != NULL) BZFREE(s->arr2);
+      if (s->ftab != NULL) BZFREE(s->ftab);
+      if (s       != NULL) BZFREE(s);
+      return BZ_MEM_ERROR;
+   }
+
+   s->blockNo           = 0;
+   s->state             = BZ_S_INPUT;
+   s->mode              = BZ_M_RUNNING;
+   s->combinedCRC       = 0;
+   s->blockSize100k     = blockSize100k;
+   s->nblockMAX         = 100000 * blockSize100k - 19;
+   s->verbosity         = verbosity;
+   s->workFactor        = workFactor;
+
+   s->block             = (UChar*)s->arr2;
+   s->mtfv              = (UInt16*)s->arr1;
+   s->zbits             = NULL;
+   s->ptr               = (UInt32*)s->arr1;
+
+   strm->state          = s;
+   strm->total_in_lo32  = 0;
+   strm->total_in_hi32  = 0;
+   strm->total_out_lo32 = 0;
+   strm->total_out_hi32 = 0;
+   init_RL ( s );
+   prepare_new_block ( s );
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+static
+void add_pair_to_block ( EState* s )
+{
+   Int32 i;
+   UChar ch = (UChar)(s->state_in_ch);
+   for (i = 0; i < s->state_in_len; i++) {
+      BZ_UPDATE_CRC( s->blockCRC, ch );
+   }
+   s->inUse[s->state_in_ch] = True;
+   switch (s->state_in_len) {
+      case 1:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 2:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 3:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      default:
+         s->inUse[s->state_in_len-4] = True;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = ((UChar)(s->state_in_len-4));
+         s->nblock++;
+         break;
+   }
+}
+
+
+/*---------------------------------------------------*/
+static
+void flush_RL ( EState* s )
+{
+   if (s->state_in_ch < 256) add_pair_to_block ( s );
+   init_RL ( s );
+}
+
+
+/*---------------------------------------------------*/
+#define ADD_CHAR_TO_BLOCK(zs,zchh0)               \
+{                                                 \
+   UInt32 zchh = (UInt32)(zchh0);                 \
+   /*-- fast track the common case --*/           \
+   if (zchh != zs->state_in_ch &&                 \
+       zs->state_in_len == 1) {                   \
+      UChar ch = (UChar)(zs->state_in_ch);        \
+      BZ_UPDATE_CRC( zs->blockCRC, ch );          \
+      zs->inUse[zs->state_in_ch] = True;          \
+      zs->block[zs->nblock] = (UChar)ch;          \
+      zs->nblock++;                               \
+      zs->state_in_ch = zchh;                     \
+   }                                              \
+   else                                           \
+   /*-- general, uncommon cases --*/              \
+   if (zchh != zs->state_in_ch ||                 \
+      zs->state_in_len == 255) {                  \
+      if (zs->state_in_ch < 256)                  \
+         add_pair_to_block ( zs );                \
+      zs->state_in_ch = zchh;                     \
+      zs->state_in_len = 1;                       \
+   } else {                                       \
+      zs->state_in_len++;                         \
+   }                                              \
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_input_until_stop ( EState* s )
+{
+   Bool progress_in = False;
+
+   if (s->mode == BZ_M_RUNNING) {
+
+      /*-- fast track the common case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+      }
+
+   } else {
+
+      /*-- general, uncommon case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         /*-- flush/finish end? --*/
+         if (s->avail_in_expect == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+         s->avail_in_expect--;
+      }
+   }
+   return progress_in;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_output_until_stop ( EState* s )
+{
+   Bool progress_out = False;
+
+   while (True) {
+
+      /*-- no output space? --*/
+      if (s->strm->avail_out == 0) break;
+
+      /*-- block done? --*/
+      if (s->state_out_pos >= s->numZ) break;
+
+      progress_out = True;
+      *(s->strm->next_out) = s->zbits[s->state_out_pos];
+      s->state_out_pos++;
+      s->strm->avail_out--;
+      s->strm->next_out++;
+      s->strm->total_out_lo32++;
+      if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+   }
+
+   return progress_out;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool handle_compress ( bz_stream* strm )
+{
+   Bool progress_in  = False;
+   Bool progress_out = False;
+   EState* s = strm->state;
+   
+   while (True) {
+
+      if (s->state == BZ_S_OUTPUT) {
+         progress_out |= copy_output_until_stop ( s );
+         if (s->state_out_pos < s->numZ) break;
+         if (s->mode == BZ_M_FINISHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+         prepare_new_block ( s );
+         s->state = BZ_S_INPUT;
+         if (s->mode == BZ_M_FLUSHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+      }
+
+      if (s->state == BZ_S_INPUT) {
+         progress_in |= copy_input_until_stop ( s );
+         if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
+            flush_RL ( s );
+            BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->nblock >= s->nblockMAX) {
+            BZ2_compressBlock ( s, False );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->strm->avail_in == 0) {
+            break;
+         }
+      }
+
+   }
+
+   return progress_in || progress_out;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
+{
+   Bool progress;
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   preswitch:
+   switch (s->mode) {
+
+      case BZ_M_IDLE:
+         return BZ_SEQUENCE_ERROR;
+
+      case BZ_M_RUNNING:
+         if (action == BZ_RUN) {
+            progress = handle_compress ( strm );
+            return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
+         } 
+         else
+	 if (action == BZ_FLUSH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FLUSHING;
+            goto preswitch;
+         }
+         else
+         if (action == BZ_FINISH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FINISHING;
+            goto preswitch;
+         }
+         else 
+            return BZ_PARAM_ERROR;
+
+      case BZ_M_FLUSHING:
+         if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
+         s->mode = BZ_M_RUNNING;
+         return BZ_RUN_OK;
+
+      case BZ_M_FINISHING:
+         if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (!progress) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FINISH_OK;
+         s->mode = BZ_M_IDLE;
+         return BZ_STREAM_END;
+   }
+   return BZ_OK; /*--not reached--*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressEnd)  ( bz_stream *strm )
+{
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->arr1 != NULL) BZFREE(s->arr1);
+   if (s->arr2 != NULL) BZFREE(s->arr2);
+   if (s->ftab != NULL) BZFREE(s->ftab);
+   BZFREE(strm->state);
+
+   strm->state = NULL;   
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/*--- Decompression stuff                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressInit) 
+                     ( bz_stream* strm, 
+                       int        verbosity,
+                       int        small )
+{
+   DState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   if (small != 0 && small != 1) return BZ_PARAM_ERROR;
+   if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
+
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(DState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm                  = strm;
+   strm->state              = s;
+   s->state                 = BZ_X_MAGIC_1;
+   s->bsLive                = 0;
+   s->bsBuff                = 0;
+   s->calculatedCombinedCRC = 0;
+   strm->total_in_lo32      = 0;
+   strm->total_in_hi32      = 0;
+   strm->total_out_lo32     = 0;
+   strm->total_out_hi32     = 0;
+   s->smallDecompress       = (Bool)small;
+   s->ll4                   = NULL;
+   s->ll16                  = NULL;
+   s->tt                    = NULL;
+   s->currBlockNo           = 0;
+   s->verbosity             = verbosity;
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/* Return  True iff data corruption is discovered.
+   Returns False if there is no problem.
+*/
+static
+Bool unRLE_obuf_to_output_FAST ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+               
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      /* restore */
+      UInt32        c_calculatedBlockCRC = s->calculatedBlockCRC;
+      UChar         c_state_out_ch       = s->state_out_ch;
+      Int32         c_state_out_len      = s->state_out_len;
+      Int32         c_nblock_used        = s->nblock_used;
+      Int32         c_k0                 = s->k0;
+      UInt32*       c_tt                 = s->tt;
+      UInt32        c_tPos               = s->tPos;
+      char*         cs_next_out          = s->strm->next_out;
+      unsigned int  cs_avail_out         = s->strm->avail_out;
+      Int32         ro_blockSize100k     = s->blockSize100k;
+      /* end restore */
+
+      UInt32       avail_out_INIT = cs_avail_out;
+      Int32        s_save_nblockPP = s->save_nblock+1;
+      unsigned int total_out_lo32_old;
+
+      while (True) {
+
+         /* try to finish existing run */
+         if (c_state_out_len > 0) {
+            while (True) {
+               if (cs_avail_out == 0) goto return_notr;
+               if (c_state_out_len == 1) break;
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               c_state_out_len--;
+               cs_next_out++;
+               cs_avail_out--;
+            }
+            s_state_out_len_eq_one:
+            {
+               if (cs_avail_out == 0) { 
+                  c_state_out_len = 1; goto return_notr;
+               };
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               cs_next_out++;
+               cs_avail_out--;
+            }
+         }   
+         /* Only caused by corrupt data stream? */
+         if (c_nblock_used > s_save_nblockPP)
+            return True;
+
+         /* can a new run be started? */
+         if (c_nblock_used == s_save_nblockPP) {
+            c_state_out_len = 0; goto return_notr;
+         };   
+         c_state_out_ch = c_k0;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (k1 != c_k0) { 
+            c_k0 = k1; goto s_state_out_len_eq_one; 
+         };
+         if (c_nblock_used == s_save_nblockPP) 
+            goto s_state_out_len_eq_one;
+   
+         c_state_out_len = 2;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         c_state_out_len = 3;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         c_state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST_C(c_k0); c_nblock_used++;
+      }
+
+      return_notr:
+      total_out_lo32_old = s->strm->total_out_lo32;
+      s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
+      if (s->strm->total_out_lo32 < total_out_lo32_old)
+         s->strm->total_out_hi32++;
+
+      /* save */
+      s->calculatedBlockCRC = c_calculatedBlockCRC;
+      s->state_out_ch       = c_state_out_ch;
+      s->state_out_len      = c_state_out_len;
+      s->nblock_used        = c_nblock_used;
+      s->k0                 = c_k0;
+      s->tt                 = c_tt;
+      s->tPos               = c_tPos;
+      s->strm->next_out     = cs_next_out;
+      s->strm->avail_out    = cs_avail_out;
+      /* end save */
+   }
+   return False;
+}
+
+
+
+/*---------------------------------------------------*/
+__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
+{
+   Int32 nb, na, mid;
+   nb = 0;
+   na = 256;
+   do {
+      mid = (nb + na) >> 1;
+      if (indx >= cftab[mid]) nb = mid; else na = mid;
+   }
+   while (na - nb != 1);
+   return nb;
+}
+
+
+/*---------------------------------------------------*/
+/* Return  True iff data corruption is discovered.
+   Returns False if there is no problem.
+*/
+static
+Bool unRLE_obuf_to_output_SMALL ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); s->nblock_used++;
+      }
+
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
+{
+   Bool    corrupt;
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   while (True) {
+      if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
+      if (s->state == BZ_X_OUTPUT) {
+         if (s->smallDecompress)
+            corrupt = unRLE_obuf_to_output_SMALL ( s ); else
+            corrupt = unRLE_obuf_to_output_FAST  ( s );
+         if (corrupt) return BZ_DATA_ERROR;
+         if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
+            BZ_FINALISE_CRC ( s->calculatedBlockCRC );
+            if (s->verbosity >= 3) 
+               VPrintf2 ( " {0x%08x, 0x%08x}", s->storedBlockCRC, 
+                          s->calculatedBlockCRC );
+            if (s->verbosity >= 2) VPrintf0 ( "]" );
+            if (s->calculatedBlockCRC != s->storedBlockCRC)
+               return BZ_DATA_ERROR;
+            s->calculatedCombinedCRC 
+               = (s->calculatedCombinedCRC << 1) | 
+                    (s->calculatedCombinedCRC >> 31);
+            s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
+            s->state = BZ_X_BLKHDR_1;
+         } else {
+            return BZ_OK;
+         }
+      }
+      if (s->state >= BZ_X_MAGIC_1) {
+         Int32 r = BZ2_decompress ( s );
+         if (r == BZ_STREAM_END) {
+            if (s->verbosity >= 3)
+               VPrintf2 ( "\n    combined CRCs: stored = 0x%08x, computed = 0x%08x", 
+                          s->storedCombinedCRC, s->calculatedCombinedCRC );
+            if (s->calculatedCombinedCRC != s->storedCombinedCRC)
+               return BZ_DATA_ERROR;
+            return r;
+         }
+         if (s->state != BZ_X_OUTPUT) return r;
+      }
+   }
+
+   AssertH ( 0, 6001 );
+
+   return 0;  /*NOTREACHED*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressEnd)  ( bz_stream *strm )
+{
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->tt   != NULL) BZFREE(s->tt);
+   if (s->ll16 != NULL) BZFREE(s->ll16);
+   if (s->ll4  != NULL) BZFREE(s->ll4);
+
+   BZFREE(strm->state);
+   strm->state = NULL;
+
+   return BZ_OK;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+/*--- File I/O stuff                              ---*/
+/*---------------------------------------------------*/
+
+#define BZ_SETERR(eee)                    \
+{                                         \
+   if (bzerror != NULL) *bzerror = eee;   \
+   if (bzf != NULL) bzf->lastErr = eee;   \
+}
+
+typedef 
+   struct {
+      FILE*     handle;
+      Char      buf[BZ_MAX_UNUSED];
+      Int32     bufN;
+      Bool      writing;
+      bz_stream strm;
+      Int32     lastErr;
+      Bool      initialisedOk;
+   }
+   bzFile;
+
+
+/*---------------------------------------------*/
+static Bool myfeof ( FILE* f )
+{
+   Int32 c = fgetc ( f );
+   if (c == EOF) return True;
+   ungetc ( c, f );
+   return False;
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzWriteOpen) 
+                    ( int*  bzerror,      
+                      FILE* f, 
+                      int   blockSize100k, 
+                      int   verbosity,
+                      int   workFactor )
+{
+   Int32   ret;
+   bzFile* bzf = NULL;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL ||
+       (blockSize100k < 1 || blockSize100k > 9) ||
+       (workFactor < 0 || workFactor > 250) ||
+       (verbosity < 0 || verbosity > 4))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+   bzf->initialisedOk = False;
+   bzf->bufN          = 0;
+   bzf->handle        = f;
+   bzf->writing       = True;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+
+   if (workFactor == 0) workFactor = 30;
+   ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = 0;
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWrite)
+             ( int*    bzerror, 
+               BZFILE* b, 
+               void*   buf, 
+               int     len )
+{
+   Int32 n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return; };
+
+   bzf->strm.avail_in = len;
+   bzf->strm.next_in  = buf;
+
+   while (True) {
+      bzf->strm.avail_out = BZ_MAX_UNUSED;
+      bzf->strm.next_out = bzf->buf;
+      ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
+      if (ret != BZ_RUN_OK)
+         { BZ_SETERR(ret); return; };
+
+      if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+         n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+         n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                       n, bzf->handle );
+         if (n != n2 || ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return; };
+      }
+
+      if (bzf->strm.avail_in == 0)
+         { BZ_SETERR(BZ_OK); return; };
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWriteClose)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in,
+                    unsigned int* nbytes_out )
+{
+   BZ2_bzWriteClose64 ( bzerror, b, abandon, 
+                        nbytes_in, NULL, nbytes_out, NULL );
+}
+
+
+void BZ_API(BZ2_bzWriteClose64)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in_lo32,
+                    unsigned int* nbytes_in_hi32,
+                    unsigned int* nbytes_out_lo32,
+                    unsigned int* nbytes_out_hi32 )
+{
+   Int32   n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
+   if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
+   if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
+   if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
+
+   if ((!abandon) && bzf->lastErr == BZ_OK) {
+      while (True) {
+         bzf->strm.avail_out = BZ_MAX_UNUSED;
+         bzf->strm.next_out = bzf->buf;
+         ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
+         if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
+            { BZ_SETERR(ret); return; };
+
+         if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+            n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+            n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                          n, bzf->handle );
+            if (n != n2 || ferror(bzf->handle))
+               { BZ_SETERR(BZ_IO_ERROR); return; };
+         }
+
+         if (ret == BZ_STREAM_END) break;
+      }
+   }
+
+   if ( !abandon && !ferror ( bzf->handle ) ) {
+      fflush ( bzf->handle );
+      if (ferror(bzf->handle))
+         { BZ_SETERR(BZ_IO_ERROR); return; };
+   }
+
+   if (nbytes_in_lo32 != NULL)
+      *nbytes_in_lo32 = bzf->strm.total_in_lo32;
+   if (nbytes_in_hi32 != NULL)
+      *nbytes_in_hi32 = bzf->strm.total_in_hi32;
+   if (nbytes_out_lo32 != NULL)
+      *nbytes_out_lo32 = bzf->strm.total_out_lo32;
+   if (nbytes_out_hi32 != NULL)
+      *nbytes_out_hi32 = bzf->strm.total_out_hi32;
+
+   BZ_SETERR(BZ_OK);
+   BZ2_bzCompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzReadOpen) 
+                   ( int*  bzerror, 
+                     FILE* f, 
+                     int   verbosity,
+                     int   small,
+                     void* unused,
+                     int   nUnused )
+{
+   bzFile* bzf = NULL;
+   int     ret;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL || 
+       (small != 0 && small != 1) ||
+       (verbosity < 0 || verbosity > 4) ||
+       (unused == NULL && nUnused != 0) ||
+       (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL) 
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+
+   bzf->initialisedOk = False;
+   bzf->handle        = f;
+   bzf->bufN          = 0;
+   bzf->writing       = False;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+   
+   while (nUnused > 0) {
+      bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
+      unused = ((void*)( 1 + ((UChar*)(unused))  ));
+      nUnused--;
+   }
+
+   ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = bzf->bufN;
+   bzf->strm.next_in  = bzf->buf;
+
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
+{
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+
+   if (bzf->initialisedOk)
+      (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzRead) 
+           ( int*    bzerror, 
+             BZFILE* b, 
+             void*   buf, 
+             int     len )
+{
+   Int32   n, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return 0; };
+
+   bzf->strm.avail_out = len;
+   bzf->strm.next_out = buf;
+
+   while (True) {
+
+      if (ferror(bzf->handle)) 
+         { BZ_SETERR(BZ_IO_ERROR); return 0; };
+
+      if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) {
+         n = fread ( bzf->buf, sizeof(UChar), 
+                     BZ_MAX_UNUSED, bzf->handle );
+         if (ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return 0; };
+         bzf->bufN = n;
+         bzf->strm.avail_in = bzf->bufN;
+         bzf->strm.next_in = bzf->buf;
+      }
+
+      ret = BZ2_bzDecompress ( &(bzf->strm) );
+
+      if (ret != BZ_OK && ret != BZ_STREAM_END)
+         { BZ_SETERR(ret); return 0; };
+
+      if (ret == BZ_OK && myfeof(bzf->handle) && 
+          bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
+         { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
+
+      if (ret == BZ_STREAM_END)
+         { BZ_SETERR(BZ_STREAM_END);
+           return len - bzf->strm.avail_out; };
+      if (bzf->strm.avail_out == 0)
+         { BZ_SETERR(BZ_OK); return len; };
+      
+   }
+
+   return 0; /*not reached*/
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadGetUnused) 
+                     ( int*    bzerror, 
+                       BZFILE* b, 
+                       void**  unused, 
+                       int*    nUnused )
+{
+   bzFile* bzf = (bzFile*)b;
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (bzf->lastErr != BZ_STREAM_END)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (unused == NULL || nUnused == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+
+   BZ_SETERR(BZ_OK);
+   *nUnused = bzf->strm.avail_in;
+   *unused = bzf->strm.next_in;
+}
+#endif
+
+
+/*---------------------------------------------------*/
+/*--- Misc convenience stuff                      ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffCompress) 
+                         ( char*         dest, 
+                           unsigned int* destLen,
+                           char*         source, 
+                           unsigned int  sourceLen,
+                           int           blockSize100k, 
+                           int           verbosity, 
+                           int           workFactor )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       blockSize100k < 1 || blockSize100k > 9 ||
+       verbosity < 0 || verbosity > 4 ||
+       workFactor < 0 || workFactor > 250) 
+      return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzCompressInit ( &strm, blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzCompress ( &strm, BZ_FINISH );
+   if (ret == BZ_FINISH_OK) goto output_overflow;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;   
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow:
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OUTBUFF_FULL;
+
+   errhandler:
+   BZ2_bzCompressEnd ( &strm );
+   return ret;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffDecompress) 
+                           ( char*         dest, 
+                             unsigned int* destLen,
+                             char*         source, 
+                             unsigned int  sourceLen,
+                             int           small,
+                             int           verbosity )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       (small != 0 && small != 1) ||
+       verbosity < 0 || verbosity > 4) 
+          return BZ_PARAM_ERROR;
+
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzDecompress ( &strm );
+   if (ret == BZ_OK) goto output_overflow_or_eof;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;
+   BZ2_bzDecompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow_or_eof:
+   if (strm.avail_out > 0) {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_UNEXPECTED_EOF;
+   } else {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_OUTBUFF_FULL;
+   };      
+
+   errhandler:
+   BZ2_bzDecompressEnd ( &strm );
+   return ret; 
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
+   to support better zlib compatibility.
+   This code is not _officially_ part of libbzip2 (yet);
+   I haven't tested it, documented it, or considered the
+   threading-safeness of it.
+   If this code breaks, please contact both Yoshioka and me.
+--*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+/*--
+   return version like "0.9.5d, 4-Sept-1999".
+--*/
+const char * BZ_API(BZ2_bzlibVersion)(void)
+{
+   return BZ_VERSION;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+
+#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
+#   include <fcntl.h>
+#   include <io.h>
+#   define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
+#else
+#   define SET_BINARY_MODE(file)
+#endif
+static
+BZFILE * bzopen_or_bzdopen
+               ( const char *path,   /* no use when bzdopen */
+                 int fd,             /* no use when bzdopen */
+                 const char *mode,
+                 int open_mode)      /* bzopen: 0, bzdopen:1 */
+{
+   int    bzerr;
+   char   unused[BZ_MAX_UNUSED];
+   int    blockSize100k = 9;
+   int    writing       = 0;
+   char   mode2[10]     = "";
+   FILE   *fp           = NULL;
+   BZFILE *bzfp         = NULL;
+   int    verbosity     = 0;
+   int    workFactor    = 30;
+   int    smallMode     = 0;
+   int    nUnused       = 0; 
+
+   if (mode == NULL) return NULL;
+   while (*mode) {
+      switch (*mode) {
+      case 'r':
+         writing = 0; break;
+      case 'w':
+         writing = 1; break;
+      case 's':
+         smallMode = 1; break;
+      default:
+         if (isdigit((int)(*mode))) {
+            blockSize100k = *mode-BZ_HDR_0;
+         }
+      }
+      mode++;
+   }
+   strcat(mode2, writing ? "w" : "r" );
+   strcat(mode2,"b");   /* binary mode */
+
+   if (open_mode==0) {
+      if (path==NULL || strcmp(path,"")==0) {
+        fp = (writing ? stdout : stdin);
+        SET_BINARY_MODE(fp);
+      } else {
+        fp = fopen(path,mode2);
+      }
+   } else {
+#ifdef BZ_STRICT_ANSI
+      fp = NULL;
+#else
+      fp = fdopen(fd,mode2);
+#endif
+   }
+   if (fp == NULL) return NULL;
+
+   if (writing) {
+      /* Guard against total chaos and anarchy -- JRS */
+      if (blockSize100k < 1) blockSize100k = 1;
+      if (blockSize100k > 9) blockSize100k = 9; 
+      bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
+                             verbosity,workFactor);
+   } else {
+      bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
+                            unused,nUnused);
+   }
+   if (bzfp == NULL) {
+      if (fp != stdin && fp != stdout) fclose(fp);
+      return NULL;
+   }
+   return bzfp;
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   open file for read or write.
+      ex) bzopen("file","w9")
+      case path="" or NULL => use stdin or stdout.
+--*/
+BZFILE * BZ_API(BZ2_bzopen)
+               ( const char *path,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
+}
+
+
+/*---------------------------------------------------*/
+BZFILE * BZ_API(BZ2_bzdopen)
+               ( int fd,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
+{
+   int bzerr, nread;
+   if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
+   nread = BZ2_bzRead(&bzerr,b,buf,len);
+   if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
+      return nread;
+   } else {
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
+{
+   int bzerr;
+
+   BZ2_bzWrite(&bzerr,b,buf,len);
+   if(bzerr == BZ_OK){
+      return len;
+   }else{
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzflush) (BZFILE *b)
+{
+   /* do nothing now... */
+   return 0;
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzclose) (BZFILE* b)
+{
+   int bzerr;
+   FILE *fp;
+   
+   if (b==NULL) {return;}
+   fp = ((bzFile *)b)->handle;
+   if(((bzFile*)b)->writing){
+      BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
+      if(bzerr != BZ_OK){
+         BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
+      }
+   }else{
+      BZ2_bzReadClose(&bzerr,b);
+   }
+   if(fp!=stdin && fp!=stdout){
+      fclose(fp);
+   }
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   return last error code 
+--*/
+static const char *bzerrorstrings[] = {
+       "OK"
+      ,"SEQUENCE_ERROR"
+      ,"PARAM_ERROR"
+      ,"MEM_ERROR"
+      ,"DATA_ERROR"
+      ,"DATA_ERROR_MAGIC"
+      ,"IO_ERROR"
+      ,"UNEXPECTED_EOF"
+      ,"OUTBUFF_FULL"
+      ,"CONFIG_ERROR"
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+};
+
+
+const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
+{
+   int err = ((bzFile *)b)->lastErr;
+
+   if(err>0) err = 0;
+   *errnum = err;
+   return bzerrorstrings[err*-1];
+}
+#endif
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/patchlib/bzlib.h b/patchlib/bzlib.h
new file mode 100644
index 00000000..7676f23a
--- /dev/null
+++ b/patchlib/bzlib.h
@@ -0,0 +1,283 @@
+
+/*-------------------------------------------------------------*/
+/*--- Public header file for the library.                   ---*/
+/*---                                               bzlib.h ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#ifndef _BZLIB_H
+#define _BZLIB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define BZ_RUN               0
+#define BZ_FLUSH             1
+#define BZ_FINISH            2
+
+#define BZ_OK                0
+#define BZ_RUN_OK            1
+#define BZ_FLUSH_OK          2
+#define BZ_FINISH_OK         3
+#define BZ_STREAM_END        4
+#define BZ_SEQUENCE_ERROR    (-1)
+#define BZ_PARAM_ERROR       (-2)
+#define BZ_MEM_ERROR         (-3)
+#define BZ_DATA_ERROR        (-4)
+#define BZ_DATA_ERROR_MAGIC  (-5)
+#define BZ_IO_ERROR          (-6)
+#define BZ_UNEXPECTED_EOF    (-7)
+#define BZ_OUTBUFF_FULL      (-8)
+#define BZ_CONFIG_ERROR      (-9)
+
+typedef 
+   struct {
+      char *next_in;
+      unsigned int avail_in;
+      unsigned int total_in_lo32;
+      unsigned int total_in_hi32;
+
+      char *next_out;
+      unsigned int avail_out;
+      unsigned int total_out_lo32;
+      unsigned int total_out_hi32;
+
+      void *state;
+
+      void *(*bzalloc)(void *,int,int);
+      void (*bzfree)(void *,void *);
+      void *opaque;
+   } 
+   bz_stream;
+
+
+#ifndef BZ_IMPORT
+#define BZ_EXPORT
+#endif
+
+#ifndef BZ_NO_STDIO
+/* Need a definitition for FILE */
+#include <stdio.h>
+#endif
+
+#ifdef _WIN32
+#   include <windows.h>
+#   ifdef small
+      /* windows.h define small to char */
+#      undef small
+#   endif
+#   ifdef BZ_EXPORT
+#   define BZ_API(func) WINAPI func
+#   define BZ_EXTERN extern
+#   else
+   /* import windows dll dynamically */
+#   define BZ_API(func) (WINAPI * func)
+#   define BZ_EXTERN
+#   endif
+#else
+#   define BZ_API(func) func
+#   define BZ_EXTERN extern
+#endif
+
+
+/*-- Core (low-level) library functions --*/
+
+BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( 
+      bz_stream* strm, 
+      int        blockSize100k, 
+      int        verbosity, 
+      int        workFactor 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzCompress) ( 
+      bz_stream* strm, 
+      int action 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( 
+      bz_stream* strm 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( 
+      bz_stream *strm, 
+      int       verbosity, 
+      int       small
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( 
+      bz_stream* strm 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( 
+      bz_stream *strm 
+   );
+
+
+
+/*-- High(er) level library functions --*/
+
+#ifndef BZ_NO_STDIO
+#define BZ_MAX_UNUSED 5000
+
+typedef void BZFILE;
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( 
+      int*  bzerror,   
+      FILE* f, 
+      int   verbosity, 
+      int   small,
+      void* unused,    
+      int   nUnused 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( 
+      int*    bzerror, 
+      BZFILE* b 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void**  unused,  
+      int*    nUnused 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzRead) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( 
+      int*  bzerror,      
+      FILE* f, 
+      int   blockSize100k, 
+      int   verbosity, 
+      int   workFactor 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWrite) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in, 
+      unsigned int* nbytes_out 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in_lo32, 
+      unsigned int* nbytes_in_hi32, 
+      unsigned int* nbytes_out_lo32, 
+      unsigned int* nbytes_out_hi32
+   );
+#endif
+
+
+/*-- Utility functions --*/
+
+BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( 
+      char*         dest, 
+      unsigned int* destLen,
+      char*         source, 
+      unsigned int  sourceLen,
+      int           blockSize100k, 
+      int           verbosity, 
+      int           workFactor 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( 
+      char*         dest, 
+      unsigned int* destLen,
+      char*         source, 
+      unsigned int  sourceLen,
+      int           small, 
+      int           verbosity 
+   );
+
+
+/*--
+   Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
+   to support better zlib compatibility.
+   This code is not _officially_ part of libbzip2 (yet);
+   I haven't tested it, documented it, or considered the
+   threading-safeness of it.
+   If this code breaks, please contact both Yoshioka and me.
+--*/
+
+BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) (
+      void
+   );
+
+#ifndef BZ_NO_STDIO
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) (
+      const char *path,
+      const char *mode
+   );
+
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) (
+      int        fd,
+      const char *mode
+   );
+         
+BZ_EXTERN int BZ_API(BZ2_bzread) (
+      BZFILE* b, 
+      void* buf, 
+      int len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzwrite) (
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzflush) (
+      BZFILE* b
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzclose) (
+      BZFILE* b
+   );
+
+BZ_EXTERN const char * BZ_API(BZ2_bzerror) (
+      BZFILE *b, 
+      int    *errnum
+   );
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.h ---*/
+/*-------------------------------------------------------------*/
+
diff --git a/patchlib/bzlib_private.h b/patchlib/bzlib_private.h
new file mode 100644
index 00000000..b134e220
--- /dev/null
+++ b/patchlib/bzlib_private.h
@@ -0,0 +1,510 @@
+
+/*-------------------------------------------------------------*/
+/*--- Private header file for the library.                  ---*/
+/*---                                       bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#ifndef _BZLIB_PRIVATE_H
+#define _BZLIB_PRIVATE_H
+
+#include <stdlib.h>
+
+#ifndef BZ_NO_STDIO
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#endif
+
+#include "bzlib.h"
+
+
+
+/*-- General stuff. --*/
+
+#define BZ_VERSION  "1.0.6, 6-Sept-2010"
+
+typedef char            Char;
+typedef unsigned char   Bool;
+typedef unsigned char   UChar;
+typedef int             Int32;
+typedef unsigned int    UInt32;
+typedef short           Int16;
+typedef unsigned short  UInt16;
+
+#define True  ((Bool)1)
+#define False ((Bool)0)
+
+#ifndef __GNUC__
+#define __inline__  /* */
+#endif 
+
+#ifndef BZ_NO_STDIO
+
+extern void BZ2_bz__AssertH__fail ( int errcode );
+#define AssertH(cond,errcode) \
+   { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
+
+#if BZ_DEBUG
+#define AssertD(cond,msg) \
+   { if (!(cond)) {       \
+      fprintf ( stderr,   \
+        "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
+      exit(1); \
+   }}
+#else
+#define AssertD(cond,msg) /* */
+#endif
+
+#define VPrintf0(zf) \
+   fprintf(stderr,zf)
+#define VPrintf1(zf,za1) \
+   fprintf(stderr,zf,za1)
+#define VPrintf2(zf,za1,za2) \
+   fprintf(stderr,zf,za1,za2)
+#define VPrintf3(zf,za1,za2,za3) \
+   fprintf(stderr,zf,za1,za2,za3)
+#define VPrintf4(zf,za1,za2,za3,za4) \
+   fprintf(stderr,zf,za1,za2,za3,za4)
+#define VPrintf5(zf,za1,za2,za3,za4,za5) \
+   fprintf(stderr,zf,za1,za2,za3,za4,za5)
+
+#else
+
+extern void bz_internal_error ( int errcode );
+#define AssertH(cond,errcode) \
+   { if (!(cond)) bz_internal_error ( errcode ); }
+#define AssertD(cond,msg)                do { } while (0)
+#define VPrintf0(zf)                     do { } while (0)
+#define VPrintf1(zf,za1)                 do { } while (0)
+#define VPrintf2(zf,za1,za2)             do { } while (0)
+#define VPrintf3(zf,za1,za2,za3)         do { } while (0)
+#define VPrintf4(zf,za1,za2,za3,za4)     do { } while (0)
+#define VPrintf5(zf,za1,za2,za3,za4,za5) do { } while (0)
+
+#endif
+
+
+#define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
+#define BZFREE(ppp)  (strm->bzfree)(strm->opaque,(ppp))
+
+
+/*-- Header bytes. --*/
+
+#define BZ_HDR_B 0x42   /* 'B' */
+#define BZ_HDR_Z 0x5a   /* 'Z' */
+#define BZ_HDR_h 0x68   /* 'h' */
+#define BZ_HDR_0 0x30   /* '0' */
+  
+/*-- Constants for the back end. --*/
+
+#define BZ_MAX_ALPHA_SIZE 258
+#define BZ_MAX_CODE_LEN    23
+
+#define BZ_RUNA 0
+#define BZ_RUNB 1
+
+#define BZ_N_GROUPS 6
+#define BZ_G_SIZE   50
+#define BZ_N_ITERS  4
+
+#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
+
+
+
+/*-- Stuff for randomising repetitive blocks. --*/
+
+extern Int32 BZ2_rNums[512];
+
+#define BZ_RAND_DECLS                          \
+   Int32 rNToGo;                               \
+   Int32 rTPos                                 \
+
+#define BZ_RAND_INIT_MASK                      \
+   s->rNToGo = 0;                              \
+   s->rTPos  = 0                               \
+
+#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
+
+#define BZ_RAND_UPD_MASK                       \
+   if (s->rNToGo == 0) {                       \
+      s->rNToGo = BZ2_rNums[s->rTPos];         \
+      s->rTPos++;                              \
+      if (s->rTPos == 512) s->rTPos = 0;       \
+   }                                           \
+   s->rNToGo--;
+
+
+
+/*-- Stuff for doing CRCs. --*/
+
+extern UInt32 BZ2_crc32Table[256];
+
+#define BZ_INITIALISE_CRC(crcVar)              \
+{                                              \
+   crcVar = 0xffffffffL;                       \
+}
+
+#define BZ_FINALISE_CRC(crcVar)                \
+{                                              \
+   crcVar = ~(crcVar);                         \
+}
+
+#define BZ_UPDATE_CRC(crcVar,cha)              \
+{                                              \
+   crcVar = (crcVar << 8) ^                    \
+            BZ2_crc32Table[(crcVar >> 24) ^    \
+                           ((UChar)cha)];      \
+}
+
+
+
+/*-- States and modes for compression. --*/
+
+#define BZ_M_IDLE      1
+#define BZ_M_RUNNING   2
+#define BZ_M_FLUSHING  3
+#define BZ_M_FINISHING 4
+
+#define BZ_S_OUTPUT    1
+#define BZ_S_INPUT     2
+
+#define BZ_N_RADIX 2
+#define BZ_N_QSORT 12
+#define BZ_N_SHELL 18
+#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
+
+
+
+
+/*-- Structure holding all the compression-side stuff. --*/
+
+typedef
+   struct {
+      /* pointer back to the struct bz_stream */
+      bz_stream* strm;
+
+      /* mode this stream is in, and whether inputting */
+      /* or outputting data */
+      Int32    mode;
+      Int32    state;
+
+      /* remembers avail_in when flush/finish requested */
+      UInt32   avail_in_expect;
+
+      /* for doing the block sorting */
+      UInt32*  arr1;
+      UInt32*  arr2;
+      UInt32*  ftab;
+      Int32    origPtr;
+
+      /* aliases for arr1 and arr2 */
+      UInt32*  ptr;
+      UChar*   block;
+      UInt16*  mtfv;
+      UChar*   zbits;
+
+      /* for deciding when to use the fallback sorting algorithm */
+      Int32    workFactor;
+
+      /* run-length-encoding of the input */
+      UInt32   state_in_ch;
+      Int32    state_in_len;
+      BZ_RAND_DECLS;
+
+      /* input and output limits and current posns */
+      Int32    nblock;
+      Int32    nblockMAX;
+      Int32    numZ;
+      Int32    state_out_pos;
+
+      /* map of bytes used in block */
+      Int32    nInUse;
+      Bool     inUse[256];
+      UChar    unseqToSeq[256];
+
+      /* the buffer for bit stream creation */
+      UInt32   bsBuff;
+      Int32    bsLive;
+
+      /* block and combined CRCs */
+      UInt32   blockCRC;
+      UInt32   combinedCRC;
+
+      /* misc administratium */
+      Int32    verbosity;
+      Int32    blockNo;
+      Int32    blockSize100k;
+
+      /* stuff for coding the MTF values */
+      Int32    nMTF;
+      Int32    mtfFreq    [BZ_MAX_ALPHA_SIZE];
+      UChar    selector   [BZ_MAX_SELECTORS];
+      UChar    selectorMtf[BZ_MAX_SELECTORS];
+
+      UChar    len     [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    code    [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    rfreq   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      /* second dimension: only 3 needed; 4 makes index calculations faster */
+      UInt32   len_pack[BZ_MAX_ALPHA_SIZE][4];
+
+   }
+   EState;
+
+
+
+/*-- externs for compression. --*/
+
+extern void 
+BZ2_blockSort ( EState* );
+
+extern void 
+BZ2_compressBlock ( EState*, Bool );
+
+extern void 
+BZ2_bsInitWrite ( EState* );
+
+extern void 
+BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
+
+extern void 
+BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
+
+
+
+/*-- states for decompression. --*/
+
+#define BZ_X_IDLE        1
+#define BZ_X_OUTPUT      2
+
+#define BZ_X_MAGIC_1     10
+#define BZ_X_MAGIC_2     11
+#define BZ_X_MAGIC_3     12
+#define BZ_X_MAGIC_4     13
+#define BZ_X_BLKHDR_1    14
+#define BZ_X_BLKHDR_2    15
+#define BZ_X_BLKHDR_3    16
+#define BZ_X_BLKHDR_4    17
+#define BZ_X_BLKHDR_5    18
+#define BZ_X_BLKHDR_6    19
+#define BZ_X_BCRC_1      20
+#define BZ_X_BCRC_2      21
+#define BZ_X_BCRC_3      22
+#define BZ_X_BCRC_4      23
+#define BZ_X_RANDBIT     24
+#define BZ_X_ORIGPTR_1   25
+#define BZ_X_ORIGPTR_2   26
+#define BZ_X_ORIGPTR_3   27
+#define BZ_X_MAPPING_1   28
+#define BZ_X_MAPPING_2   29
+#define BZ_X_SELECTOR_1  30
+#define BZ_X_SELECTOR_2  31
+#define BZ_X_SELECTOR_3  32
+#define BZ_X_CODING_1    33
+#define BZ_X_CODING_2    34
+#define BZ_X_CODING_3    35
+#define BZ_X_MTF_1       36
+#define BZ_X_MTF_2       37
+#define BZ_X_MTF_3       38
+#define BZ_X_MTF_4       39
+#define BZ_X_MTF_5       40
+#define BZ_X_MTF_6       41
+#define BZ_X_ENDHDR_2    42
+#define BZ_X_ENDHDR_3    43
+#define BZ_X_ENDHDR_4    44
+#define BZ_X_ENDHDR_5    45
+#define BZ_X_ENDHDR_6    46
+#define BZ_X_CCRC_1      47
+#define BZ_X_CCRC_2      48
+#define BZ_X_CCRC_3      49
+#define BZ_X_CCRC_4      50
+
+
+
+/*-- Constants for the fast MTF decoder. --*/
+
+#define MTFA_SIZE 4096
+#define MTFL_SIZE 16
+
+
+
+/*-- Structure holding all the decompression-side stuff. --*/
+
+typedef
+   struct {
+      /* pointer back to the struct bz_stream */
+      bz_stream* strm;
+
+      /* state indicator for this stream */
+      Int32    state;
+
+      /* for doing the final run-length decoding */
+      UChar    state_out_ch;
+      Int32    state_out_len;
+      Bool     blockRandomised;
+      BZ_RAND_DECLS;
+
+      /* the buffer for bit stream reading */
+      UInt32   bsBuff;
+      Int32    bsLive;
+
+      /* misc administratium */
+      Int32    blockSize100k;
+      Bool     smallDecompress;
+      Int32    currBlockNo;
+      Int32    verbosity;
+
+      /* for undoing the Burrows-Wheeler transform */
+      Int32    origPtr;
+      UInt32   tPos;
+      Int32    k0;
+      Int32    unzftab[256];
+      Int32    nblock_used;
+      Int32    cftab[257];
+      Int32    cftabCopy[257];
+
+      /* for undoing the Burrows-Wheeler transform (FAST) */
+      UInt32   *tt;
+
+      /* for undoing the Burrows-Wheeler transform (SMALL) */
+      UInt16   *ll16;
+      UChar    *ll4;
+
+      /* stored and calculated CRCs */
+      UInt32   storedBlockCRC;
+      UInt32   storedCombinedCRC;
+      UInt32   calculatedBlockCRC;
+      UInt32   calculatedCombinedCRC;
+
+      /* map of bytes used in block */
+      Int32    nInUse;
+      Bool     inUse[256];
+      Bool     inUse16[16];
+      UChar    seqToUnseq[256];
+
+      /* for decoding the MTF values */
+      UChar    mtfa   [MTFA_SIZE];
+      Int32    mtfbase[256 / MTFL_SIZE];
+      UChar    selector   [BZ_MAX_SELECTORS];
+      UChar    selectorMtf[BZ_MAX_SELECTORS];
+      UChar    len  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+
+      Int32    limit  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    base   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    perm   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    minLens[BZ_N_GROUPS];
+
+      /* save area for scalars in the main decompress code */
+      Int32    save_i;
+      Int32    save_j;
+      Int32    save_t;
+      Int32    save_alphaSize;
+      Int32    save_nGroups;
+      Int32    save_nSelectors;
+      Int32    save_EOB;
+      Int32    save_groupNo;
+      Int32    save_groupPos;
+      Int32    save_nextSym;
+      Int32    save_nblockMAX;
+      Int32    save_nblock;
+      Int32    save_es;
+      Int32    save_N;
+      Int32    save_curr;
+      Int32    save_zt;
+      Int32    save_zn; 
+      Int32    save_zvec;
+      Int32    save_zj;
+      Int32    save_gSel;
+      Int32    save_gMinlen;
+      Int32*   save_gLimit;
+      Int32*   save_gBase;
+      Int32*   save_gPerm;
+
+   }
+   DState;
+
+
+
+/*-- Macros for decompression. --*/
+
+#define BZ_GET_FAST(cccc)                     \
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
+    s->tPos = s->tt[s->tPos];                 \
+    cccc = (UChar)(s->tPos & 0xff);           \
+    s->tPos >>= 8;
+
+#define BZ_GET_FAST_C(cccc)                   \
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (c_tPos >= (UInt32)100000 * (UInt32)ro_blockSize100k) return True; \
+    c_tPos = c_tt[c_tPos];                    \
+    cccc = (UChar)(c_tPos & 0xff);            \
+    c_tPos >>= 8;
+
+#define SET_LL4(i,n)                                          \
+   { if (((i) & 0x1) == 0)                                    \
+        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else    \
+        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4);  \
+   }
+
+#define GET_LL4(i)                             \
+   ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
+
+#define SET_LL(i,n)                          \
+   { s->ll16[i] = (UInt16)(n & 0x0000ffff);  \
+     SET_LL4(i, n >> 16);                    \
+   }
+
+#define GET_LL(i) \
+   (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
+
+#define BZ_GET_SMALL(cccc)                            \
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
+    cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
+    s->tPos = GET_LL(s->tPos);
+
+
+/*-- externs for decompression. --*/
+
+extern Int32 
+BZ2_indexIntoF ( Int32, Int32* );
+
+extern Int32 
+BZ2_decompress ( DState* );
+
+extern void 
+BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
+                           Int32,  Int32, Int32 );
+
+
+#endif
+
+
+/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
+
+#ifdef BZ_NO_STDIO
+#ifndef NULL
+#define NULL 0
+#endif
+#endif
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                   bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
+
diff --git a/patchlib/compress.c b/patchlib/compress.c
new file mode 100644
index 00000000..caf76960
--- /dev/null
+++ b/patchlib/compress.c
@@ -0,0 +1,672 @@
+
+/*-------------------------------------------------------------*/
+/*--- Compression machinery (not incl block sorting)        ---*/
+/*---                                            compress.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+/* CHANGES
+    0.9.0    -- original version.
+    0.9.0a/b -- no changes in this file.
+    0.9.0c   -- changed setting of nGroups in sendMTFValues() 
+                so as to do a bit better on small files
+*/
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+/*--- Bit stream I/O                              ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+void BZ2_bsInitWrite ( EState* s )
+{
+   s->bsLive = 0;
+   s->bsBuff = 0;
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsFinishWrite ( EState* s )
+{
+   while (s->bsLive > 0) {
+      s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
+      s->numZ++;
+      s->bsBuff <<= 8;
+      s->bsLive -= 8;
+   }
+}
+
+
+/*---------------------------------------------------*/
+#define bsNEEDW(nz)                           \
+{                                             \
+   while (s->bsLive >= 8) {                   \
+      s->zbits[s->numZ]                       \
+         = (UChar)(s->bsBuff >> 24);          \
+      s->numZ++;                              \
+      s->bsBuff <<= 8;                        \
+      s->bsLive -= 8;                         \
+   }                                          \
+}
+
+
+/*---------------------------------------------------*/
+static
+__inline__
+void bsW ( EState* s, Int32 n, UInt32 v )
+{
+   bsNEEDW ( n );
+   s->bsBuff |= (v << (32 - s->bsLive - n));
+   s->bsLive += n;
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutUInt32 ( EState* s, UInt32 u )
+{
+   bsW ( s, 8, (u >> 24) & 0xffL );
+   bsW ( s, 8, (u >> 16) & 0xffL );
+   bsW ( s, 8, (u >>  8) & 0xffL );
+   bsW ( s, 8,  u        & 0xffL );
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutUChar ( EState* s, UChar c )
+{
+   bsW( s, 8, (UInt32)c );
+}
+
+
+/*---------------------------------------------------*/
+/*--- The back end proper                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+static
+void makeMaps_e ( EState* s )
+{
+   Int32 i;
+   s->nInUse = 0;
+   for (i = 0; i < 256; i++)
+      if (s->inUse[i]) {
+         s->unseqToSeq[i] = s->nInUse;
+         s->nInUse++;
+      }
+}
+
+
+/*---------------------------------------------------*/
+static
+void generateMTFValues ( EState* s )
+{
+   UChar   yy[256];
+   Int32   i, j;
+   Int32   zPend;
+   Int32   wr;
+   Int32   EOB;
+
+   /* 
+      After sorting (eg, here),
+         s->arr1 [ 0 .. s->nblock-1 ] holds sorted order,
+         and
+         ((UChar*)s->arr2) [ 0 .. s->nblock-1 ] 
+         holds the original block data.
+
+      The first thing to do is generate the MTF values,
+      and put them in
+         ((UInt16*)s->arr1) [ 0 .. s->nblock-1 ].
+      Because there are strictly fewer or equal MTF values
+      than block values, ptr values in this area are overwritten
+      with MTF values only when they are no longer needed.
+
+      The final compressed bitstream is generated into the
+      area starting at
+         (UChar*) (&((UChar*)s->arr2)[s->nblock])
+
+      These storage aliases are set up in bzCompressInit(),
+      except for the last one, which is arranged in 
+      compressBlock().
+   */
+   UInt32* ptr   = s->ptr;
+   UChar* block  = s->block;
+   UInt16* mtfv  = s->mtfv;
+
+   makeMaps_e ( s );
+   EOB = s->nInUse+1;
+
+   for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0;
+
+   wr = 0;
+   zPend = 0;
+   for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i;
+
+   for (i = 0; i < s->nblock; i++) {
+      UChar ll_i;
+      AssertD ( wr <= i, "generateMTFValues(1)" );
+      j = ptr[i]-1; if (j < 0) j += s->nblock;
+      ll_i = s->unseqToSeq[block[j]];
+      AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" );
+
+      if (yy[0] == ll_i) { 
+         zPend++;
+      } else {
+
+         if (zPend > 0) {
+            zPend--;
+            while (True) {
+               if (zPend & 1) {
+                  mtfv[wr] = BZ_RUNB; wr++; 
+                  s->mtfFreq[BZ_RUNB]++; 
+               } else {
+                  mtfv[wr] = BZ_RUNA; wr++; 
+                  s->mtfFreq[BZ_RUNA]++; 
+               }
+               if (zPend < 2) break;
+               zPend = (zPend - 2) / 2;
+            };
+            zPend = 0;
+         }
+         {
+            register UChar  rtmp;
+            register UChar* ryy_j;
+            register UChar  rll_i;
+            rtmp  = yy[1];
+            yy[1] = yy[0];
+            ryy_j = &(yy[1]);
+            rll_i = ll_i;
+            while ( rll_i != rtmp ) {
+               register UChar rtmp2;
+               ryy_j++;
+               rtmp2  = rtmp;
+               rtmp   = *ryy_j;
+               *ryy_j = rtmp2;
+            };
+            yy[0] = rtmp;
+            j = ryy_j - &(yy[0]);
+            mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++;
+         }
+
+      }
+   }
+
+   if (zPend > 0) {
+      zPend--;
+      while (True) {
+         if (zPend & 1) {
+            mtfv[wr] = BZ_RUNB; wr++; 
+            s->mtfFreq[BZ_RUNB]++; 
+         } else {
+            mtfv[wr] = BZ_RUNA; wr++; 
+            s->mtfFreq[BZ_RUNA]++; 
+         }
+         if (zPend < 2) break;
+         zPend = (zPend - 2) / 2;
+      };
+      zPend = 0;
+   }
+
+   mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;
+
+   s->nMTF = wr;
+}
+
+
+/*---------------------------------------------------*/
+#define BZ_LESSER_ICOST  0
+#define BZ_GREATER_ICOST 15
+
+static
+void sendMTFValues ( EState* s )
+{
+   Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
+   Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
+   Int32 nGroups, nBytes;
+
+   /*--
+   UChar  len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   is a global since the decoder also needs it.
+
+   Int32  code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   Int32  rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   are also globals only used in this proc.
+   Made global to keep stack frame size small.
+   --*/
+
+
+   UInt16 cost[BZ_N_GROUPS];
+   Int32  fave[BZ_N_GROUPS];
+
+   UInt16* mtfv = s->mtfv;
+
+   if (s->verbosity >= 3)
+      VPrintf3( "      %d in block, %d after MTF & 1-2 coding, "
+                "%d+2 syms in use\n", 
+                s->nblock, s->nMTF, s->nInUse );
+
+   alphaSize = s->nInUse+2;
+   for (t = 0; t < BZ_N_GROUPS; t++)
+      for (v = 0; v < alphaSize; v++)
+         s->len[t][v] = BZ_GREATER_ICOST;
+
+   /*--- Decide how many coding tables to use ---*/
+   AssertH ( s->nMTF > 0, 3001 );
+   if (s->nMTF < 200)  nGroups = 2; else
+   if (s->nMTF < 600)  nGroups = 3; else
+   if (s->nMTF < 1200) nGroups = 4; else
+   if (s->nMTF < 2400) nGroups = 5; else
+                       nGroups = 6;
+
+   /*--- Generate an initial set of coding tables ---*/
+   { 
+      Int32 nPart, remF, tFreq, aFreq;
+
+      nPart = nGroups;
+      remF  = s->nMTF;
+      gs = 0;
+      while (nPart > 0) {
+         tFreq = remF / nPart;
+         ge = gs-1;
+         aFreq = 0;
+         while (aFreq < tFreq && ge < alphaSize-1) {
+            ge++;
+            aFreq += s->mtfFreq[ge];
+         }
+
+         if (ge > gs 
+             && nPart != nGroups && nPart != 1 
+             && ((nGroups-nPart) % 2 == 1)) {
+            aFreq -= s->mtfFreq[ge];
+            ge--;
+         }
+
+         if (s->verbosity >= 3)
+            VPrintf5( "      initial group %d, [%d .. %d], "
+                      "has %d syms (%4.1f%%)\n",
+                      nPart, gs, ge, aFreq, 
+                      (100.0 * (float)aFreq) / (float)(s->nMTF) );
+ 
+         for (v = 0; v < alphaSize; v++)
+            if (v >= gs && v <= ge) 
+               s->len[nPart-1][v] = BZ_LESSER_ICOST; else
+               s->len[nPart-1][v] = BZ_GREATER_ICOST;
+ 
+         nPart--;
+         gs = ge+1;
+         remF -= aFreq;
+      }
+   }
+
+   /*--- 
+      Iterate up to BZ_N_ITERS times to improve the tables.
+   ---*/
+   for (iter = 0; iter < BZ_N_ITERS; iter++) {
+
+      for (t = 0; t < nGroups; t++) fave[t] = 0;
+
+      for (t = 0; t < nGroups; t++)
+         for (v = 0; v < alphaSize; v++)
+            s->rfreq[t][v] = 0;
+
+      /*---
+        Set up an auxiliary length table which is used to fast-track
+	the common case (nGroups == 6). 
+      ---*/
+      if (nGroups == 6) {
+         for (v = 0; v < alphaSize; v++) {
+            s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
+            s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
+            s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
+	 }
+      }
+
+      nSelectors = 0;
+      totc = 0;
+      gs = 0;
+      while (True) {
+
+         /*--- Set group start & end marks. --*/
+         if (gs >= s->nMTF) break;
+         ge = gs + BZ_G_SIZE - 1; 
+         if (ge >= s->nMTF) ge = s->nMTF-1;
+
+         /*-- 
+            Calculate the cost of this group as coded
+            by each of the coding tables.
+         --*/
+         for (t = 0; t < nGroups; t++) cost[t] = 0;
+
+         if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+            register UInt32 cost01, cost23, cost45;
+            register UInt16 icv;
+            cost01 = cost23 = cost45 = 0;
+
+#           define BZ_ITER(nn)                \
+               icv = mtfv[gs+(nn)];           \
+               cost01 += s->len_pack[icv][0]; \
+               cost23 += s->len_pack[icv][1]; \
+               cost45 += s->len_pack[icv][2]; \
+
+            BZ_ITER(0);  BZ_ITER(1);  BZ_ITER(2);  BZ_ITER(3);  BZ_ITER(4);
+            BZ_ITER(5);  BZ_ITER(6);  BZ_ITER(7);  BZ_ITER(8);  BZ_ITER(9);
+            BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
+            BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
+            BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
+            BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
+            BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
+            BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
+            BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
+            BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);
+
+#           undef BZ_ITER
+
+            cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
+            cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
+            cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;
+
+         } else {
+	    /*--- slow version which correctly handles all situations ---*/
+            for (i = gs; i <= ge; i++) { 
+               UInt16 icv = mtfv[i];
+               for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
+            }
+         }
+ 
+         /*-- 
+            Find the coding table which is best for this group,
+            and record its identity in the selector table.
+         --*/
+         bc = 999999999; bt = -1;
+         for (t = 0; t < nGroups; t++)
+            if (cost[t] < bc) { bc = cost[t]; bt = t; };
+         totc += bc;
+         fave[bt]++;
+         s->selector[nSelectors] = bt;
+         nSelectors++;
+
+         /*-- 
+            Increment the symbol frequencies for the selected table.
+          --*/
+         if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+
+#           define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++
+
+            BZ_ITUR(0);  BZ_ITUR(1);  BZ_ITUR(2);  BZ_ITUR(3);  BZ_ITUR(4);
+            BZ_ITUR(5);  BZ_ITUR(6);  BZ_ITUR(7);  BZ_ITUR(8);  BZ_ITUR(9);
+            BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
+            BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
+            BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
+            BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
+            BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
+            BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
+            BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
+            BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);
+
+#           undef BZ_ITUR
+
+         } else {
+	    /*--- slow version which correctly handles all situations ---*/
+            for (i = gs; i <= ge; i++)
+               s->rfreq[bt][ mtfv[i] ]++;
+         }
+
+         gs = ge+1;
+      }
+      if (s->verbosity >= 3) {
+         VPrintf2 ( "      pass %d: size is %d, grp uses are ", 
+                   iter+1, totc/8 );
+         for (t = 0; t < nGroups; t++)
+            VPrintf1 ( "%d ", fave[t] );
+         VPrintf0 ( "\n" );
+      }
+
+      /*--
+        Recompute the tables based on the accumulated frequencies.
+      --*/
+      /* maxLen was changed from 20 to 17 in bzip2-1.0.3.  See 
+         comment in huffman.c for details. */
+      for (t = 0; t < nGroups; t++)
+         BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]), 
+                                 alphaSize, 17 /*20*/ );
+   }
+
+
+   AssertH( nGroups < 8, 3002 );
+   AssertH( nSelectors < 32768 &&
+            nSelectors <= (2 + (900000 / BZ_G_SIZE)),
+            3003 );
+
+
+   /*--- Compute MTF values for the selectors. ---*/
+   {
+      UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
+      for (i = 0; i < nGroups; i++) pos[i] = i;
+      for (i = 0; i < nSelectors; i++) {
+         ll_i = s->selector[i];
+         j = 0;
+         tmp = pos[j];
+         while ( ll_i != tmp ) {
+            j++;
+            tmp2 = tmp;
+            tmp = pos[j];
+            pos[j] = tmp2;
+         };
+         pos[0] = tmp;
+         s->selectorMtf[i] = j;
+      }
+   };
+
+   /*--- Assign actual codes for the tables. --*/
+   for (t = 0; t < nGroups; t++) {
+      minLen = 32;
+      maxLen = 0;
+      for (i = 0; i < alphaSize; i++) {
+         if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
+         if (s->len[t][i] < minLen) minLen = s->len[t][i];
+      }
+      AssertH ( !(maxLen > 17 /*20*/ ), 3004 );
+      AssertH ( !(minLen < 1),  3005 );
+      BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]), 
+                          minLen, maxLen, alphaSize );
+   }
+
+   /*--- Transmit the mapping table. ---*/
+   { 
+      Bool inUse16[16];
+      for (i = 0; i < 16; i++) {
+          inUse16[i] = False;
+          for (j = 0; j < 16; j++)
+             if (s->inUse[i * 16 + j]) inUse16[i] = True;
+      }
+     
+      nBytes = s->numZ;
+      for (i = 0; i < 16; i++)
+         if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0);
+
+      for (i = 0; i < 16; i++)
+         if (inUse16[i])
+            for (j = 0; j < 16; j++) {
+               if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0);
+            }
+
+      if (s->verbosity >= 3) 
+         VPrintf1( "      bytes: mapping %d, ", s->numZ-nBytes );
+   }
+
+   /*--- Now the selectors. ---*/
+   nBytes = s->numZ;
+   bsW ( s, 3, nGroups );
+   bsW ( s, 15, nSelectors );
+   for (i = 0; i < nSelectors; i++) { 
+      for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1);
+      bsW(s,1,0);
+   }
+   if (s->verbosity >= 3)
+      VPrintf1( "selectors %d, ", s->numZ-nBytes );
+
+   /*--- Now the coding tables. ---*/
+   nBytes = s->numZ;
+
+   for (t = 0; t < nGroups; t++) {
+      Int32 curr = s->len[t][0];
+      bsW ( s, 5, curr );
+      for (i = 0; i < alphaSize; i++) {
+         while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ };
+         while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ };
+         bsW ( s, 1, 0 );
+      }
+   }
+
+   if (s->verbosity >= 3)
+      VPrintf1 ( "code lengths %d, ", s->numZ-nBytes );
+
+   /*--- And finally, the block data proper ---*/
+   nBytes = s->numZ;
+   selCtr = 0;
+   gs = 0;
+   while (True) {
+      if (gs >= s->nMTF) break;
+      ge = gs + BZ_G_SIZE - 1; 
+      if (ge >= s->nMTF) ge = s->nMTF-1;
+      AssertH ( s->selector[selCtr] < nGroups, 3006 );
+
+      if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+            UInt16 mtfv_i;
+            UChar* s_len_sel_selCtr 
+               = &(s->len[s->selector[selCtr]][0]);
+            Int32* s_code_sel_selCtr
+               = &(s->code[s->selector[selCtr]][0]);
+
+#           define BZ_ITAH(nn)                      \
+               mtfv_i = mtfv[gs+(nn)];              \
+               bsW ( s,                             \
+                     s_len_sel_selCtr[mtfv_i],      \
+                     s_code_sel_selCtr[mtfv_i] )
+
+            BZ_ITAH(0);  BZ_ITAH(1);  BZ_ITAH(2);  BZ_ITAH(3);  BZ_ITAH(4);
+            BZ_ITAH(5);  BZ_ITAH(6);  BZ_ITAH(7);  BZ_ITAH(8);  BZ_ITAH(9);
+            BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
+            BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
+            BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
+            BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
+            BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
+            BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
+            BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
+            BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);
+
+#           undef BZ_ITAH
+
+      } else {
+	 /*--- slow version which correctly handles all situations ---*/
+         for (i = gs; i <= ge; i++) {
+            bsW ( s, 
+                  s->len  [s->selector[selCtr]] [mtfv[i]],
+                  s->code [s->selector[selCtr]] [mtfv[i]] );
+         }
+      }
+
+
+      gs = ge+1;
+      selCtr++;
+   }
+   AssertH( selCtr == nSelectors, 3007 );
+
+   if (s->verbosity >= 3)
+      VPrintf1( "codes %d\n", s->numZ-nBytes );
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_compressBlock ( EState* s, Bool is_last_block )
+{
+   if (s->nblock > 0) {
+
+      BZ_FINALISE_CRC ( s->blockCRC );
+      s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
+      s->combinedCRC ^= s->blockCRC;
+      if (s->blockNo > 1) s->numZ = 0;
+
+      if (s->verbosity >= 2)
+         VPrintf4( "    block %d: crc = 0x%08x, "
+                   "combined CRC = 0x%08x, size = %d\n",
+                   s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );
+
+      BZ2_blockSort ( s );
+   }
+
+   s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);
+
+   /*-- If this is the first block, create the stream header. --*/
+   if (s->blockNo == 1) {
+      BZ2_bsInitWrite ( s );
+      bsPutUChar ( s, BZ_HDR_B );
+      bsPutUChar ( s, BZ_HDR_Z );
+      bsPutUChar ( s, BZ_HDR_h );
+      bsPutUChar ( s, (UChar)(BZ_HDR_0 + s->blockSize100k) );
+   }
+
+   if (s->nblock > 0) {
+
+      bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 );
+      bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 );
+      bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 );
+
+      /*-- Now the block's CRC, so it is in a known place. --*/
+      bsPutUInt32 ( s, s->blockCRC );
+
+      /*-- 
+         Now a single bit indicating (non-)randomisation. 
+         As of version 0.9.5, we use a better sorting algorithm
+         which makes randomisation unnecessary.  So always set
+         the randomised bit to 'no'.  Of course, the decoder
+         still needs to be able to handle randomised blocks
+         so as to maintain backwards compatibility with
+         older versions of bzip2.
+      --*/
+      bsW(s,1,0);
+
+      bsW ( s, 24, s->origPtr );
+      generateMTFValues ( s );
+      sendMTFValues ( s );
+   }
+
+
+   /*-- If this is the last block, add the stream trailer. --*/
+   if (is_last_block) {
+
+      bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 );
+      bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 );
+      bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
+      bsPutUInt32 ( s, s->combinedCRC );
+      if (s->verbosity >= 2)
+         VPrintf1( "    final combined CRC = 0x%08x\n   ", s->combinedCRC );
+      bsFinishWrite ( s );
+   }
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        compress.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/patchlib/crctable.c b/patchlib/crctable.c
new file mode 100644
index 00000000..1fea7e94
--- /dev/null
+++ b/patchlib/crctable.c
@@ -0,0 +1,104 @@
+
+/*-------------------------------------------------------------*/
+/*--- Table for doing CRCs                                  ---*/
+/*---                                            crctable.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include "bzlib_private.h"
+
+/*--
+  I think this is an implementation of the AUTODIN-II,
+  Ethernet & FDDI 32-bit CRC standard.  Vaguely derived
+  from code by Rob Warnock, in Section 51 of the
+  comp.compression FAQ.
+--*/
+
+UInt32 BZ2_crc32Table[256] = {
+
+   /*-- Ugly, innit? --*/
+
+   0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L,
+   0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L,
+   0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L,
+   0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL,
+   0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L,
+   0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L,
+   0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L,
+   0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL,
+   0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L,
+   0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L,
+   0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L,
+   0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL,
+   0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L,
+   0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L,
+   0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L,
+   0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL,
+   0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL,
+   0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L,
+   0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L,
+   0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL,
+   0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL,
+   0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L,
+   0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L,
+   0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL,
+   0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL,
+   0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L,
+   0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L,
+   0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL,
+   0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL,
+   0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L,
+   0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L,
+   0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL,
+   0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L,
+   0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL,
+   0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL,
+   0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L,
+   0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L,
+   0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL,
+   0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL,
+   0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L,
+   0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L,
+   0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL,
+   0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL,
+   0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L,
+   0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L,
+   0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL,
+   0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL,
+   0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L,
+   0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L,
+   0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL,
+   0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L,
+   0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L,
+   0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L,
+   0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL,
+   0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L,
+   0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L,
+   0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L,
+   0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL,
+   0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L,
+   0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L,
+   0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L,
+   0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL,
+   0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L,
+   0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L
+};
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        crctable.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/patchlib/decompress.c b/patchlib/decompress.c
new file mode 100644
index 00000000..311f5668
--- /dev/null
+++ b/patchlib/decompress.c
@@ -0,0 +1,646 @@
+
+/*-------------------------------------------------------------*/
+/*--- Decompression machinery                               ---*/
+/*---                                          decompress.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+static
+void makeMaps_d ( DState* s )
+{
+   Int32 i;
+   s->nInUse = 0;
+   for (i = 0; i < 256; i++)
+      if (s->inUse[i]) {
+         s->seqToUnseq[s->nInUse] = i;
+         s->nInUse++;
+      }
+}
+
+
+/*---------------------------------------------------*/
+#define RETURN(rrr)                               \
+   { retVal = rrr; goto save_state_and_return; };
+
+#define GET_BITS(lll,vvv,nnn)                     \
+   case lll: s->state = lll;                      \
+   while (True) {                                 \
+      if (s->bsLive >= nnn) {                     \
+         UInt32 v;                                \
+         v = (s->bsBuff >>                        \
+             (s->bsLive-nnn)) & ((1 << nnn)-1);   \
+         s->bsLive -= nnn;                        \
+         vvv = v;                                 \
+         break;                                   \
+      }                                           \
+      if (s->strm->avail_in == 0) RETURN(BZ_OK);  \
+      s->bsBuff                                   \
+         = (s->bsBuff << 8) |                     \
+           ((UInt32)                              \
+              (*((UChar*)(s->strm->next_in))));   \
+      s->bsLive += 8;                             \
+      s->strm->next_in++;                         \
+      s->strm->avail_in--;                        \
+      s->strm->total_in_lo32++;                   \
+      if (s->strm->total_in_lo32 == 0)            \
+         s->strm->total_in_hi32++;                \
+   }
+
+#define GET_UCHAR(lll,uuu)                        \
+   GET_BITS(lll,uuu,8)
+
+#define GET_BIT(lll,uuu)                          \
+   GET_BITS(lll,uuu,1)
+
+/*---------------------------------------------------*/
+#define GET_MTF_VAL(label1,label2,lval)           \
+{                                                 \
+   if (groupPos == 0) {                           \
+      groupNo++;                                  \
+      if (groupNo >= nSelectors)                  \
+         RETURN(BZ_DATA_ERROR);                   \
+      groupPos = BZ_G_SIZE;                       \
+      gSel = s->selector[groupNo];                \
+      gMinlen = s->minLens[gSel];                 \
+      gLimit = &(s->limit[gSel][0]);              \
+      gPerm = &(s->perm[gSel][0]);                \
+      gBase = &(s->base[gSel][0]);                \
+   }                                              \
+   groupPos--;                                    \
+   zn = gMinlen;                                  \
+   GET_BITS(label1, zvec, zn);                    \
+   while (1) {                                    \
+      if (zn > 20 /* the longest code */)         \
+         RETURN(BZ_DATA_ERROR);                   \
+      if (zvec <= gLimit[zn]) break;              \
+      zn++;                                       \
+      GET_BIT(label2, zj);                        \
+      zvec = (zvec << 1) | zj;                    \
+   };                                             \
+   if (zvec - gBase[zn] < 0                       \
+       || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE)  \
+      RETURN(BZ_DATA_ERROR);                      \
+   lval = gPerm[zvec - gBase[zn]];                \
+}
+
+
+/*---------------------------------------------------*/
+Int32 BZ2_decompress ( DState* s )
+{
+   UChar      uc;
+   Int32      retVal;
+   Int32      minLen, maxLen;
+   bz_stream* strm = s->strm;
+
+   /* stuff that needs to be saved/restored */
+   Int32  i;
+   Int32  j;
+   Int32  t;
+   Int32  alphaSize;
+   Int32  nGroups;
+   Int32  nSelectors;
+   Int32  EOB;
+   Int32  groupNo;
+   Int32  groupPos;
+   Int32  nextSym;
+   Int32  nblockMAX;
+   Int32  nblock;
+   Int32  es;
+   Int32  N;
+   Int32  curr;
+   Int32  zt;
+   Int32  zn; 
+   Int32  zvec;
+   Int32  zj;
+   Int32  gSel;
+   Int32  gMinlen;
+   Int32* gLimit;
+   Int32* gBase;
+   Int32* gPerm;
+
+   if (s->state == BZ_X_MAGIC_1) {
+      /*initialise the save area*/
+      s->save_i           = 0;
+      s->save_j           = 0;
+      s->save_t           = 0;
+      s->save_alphaSize   = 0;
+      s->save_nGroups     = 0;
+      s->save_nSelectors  = 0;
+      s->save_EOB         = 0;
+      s->save_groupNo     = 0;
+      s->save_groupPos    = 0;
+      s->save_nextSym     = 0;
+      s->save_nblockMAX   = 0;
+      s->save_nblock      = 0;
+      s->save_es          = 0;
+      s->save_N           = 0;
+      s->save_curr        = 0;
+      s->save_zt          = 0;
+      s->save_zn          = 0;
+      s->save_zvec        = 0;
+      s->save_zj          = 0;
+      s->save_gSel        = 0;
+      s->save_gMinlen     = 0;
+      s->save_gLimit      = NULL;
+      s->save_gBase       = NULL;
+      s->save_gPerm       = NULL;
+   }
+
+   /*restore from the save area*/
+   i           = s->save_i;
+   j           = s->save_j;
+   t           = s->save_t;
+   alphaSize   = s->save_alphaSize;
+   nGroups     = s->save_nGroups;
+   nSelectors  = s->save_nSelectors;
+   EOB         = s->save_EOB;
+   groupNo     = s->save_groupNo;
+   groupPos    = s->save_groupPos;
+   nextSym     = s->save_nextSym;
+   nblockMAX   = s->save_nblockMAX;
+   nblock      = s->save_nblock;
+   es          = s->save_es;
+   N           = s->save_N;
+   curr        = s->save_curr;
+   zt          = s->save_zt;
+   zn          = s->save_zn; 
+   zvec        = s->save_zvec;
+   zj          = s->save_zj;
+   gSel        = s->save_gSel;
+   gMinlen     = s->save_gMinlen;
+   gLimit      = s->save_gLimit;
+   gBase       = s->save_gBase;
+   gPerm       = s->save_gPerm;
+
+   retVal = BZ_OK;
+
+   switch (s->state) {
+
+      GET_UCHAR(BZ_X_MAGIC_1, uc);
+      if (uc != BZ_HDR_B) RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_UCHAR(BZ_X_MAGIC_2, uc);
+      if (uc != BZ_HDR_Z) RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_UCHAR(BZ_X_MAGIC_3, uc)
+      if (uc != BZ_HDR_h) RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8)
+      if (s->blockSize100k < (BZ_HDR_0 + 1) || 
+          s->blockSize100k > (BZ_HDR_0 + 9)) RETURN(BZ_DATA_ERROR_MAGIC);
+      s->blockSize100k -= BZ_HDR_0;
+
+      if (s->smallDecompress) {
+         s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) );
+         s->ll4  = BZALLOC( 
+                      ((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar) 
+                   );
+         if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR);
+      } else {
+         s->tt  = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) );
+         if (s->tt == NULL) RETURN(BZ_MEM_ERROR);
+      }
+
+      GET_UCHAR(BZ_X_BLKHDR_1, uc);
+
+      if (uc == 0x17) goto endhdr_2;
+      if (uc != 0x31) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_2, uc);
+      if (uc != 0x41) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_3, uc);
+      if (uc != 0x59) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_4, uc);
+      if (uc != 0x26) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_5, uc);
+      if (uc != 0x53) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_6, uc);
+      if (uc != 0x59) RETURN(BZ_DATA_ERROR);
+
+      s->currBlockNo++;
+      if (s->verbosity >= 2)
+         VPrintf1 ( "\n    [%d: huff+mtf ", s->currBlockNo );
+ 
+      s->storedBlockCRC = 0;
+      GET_UCHAR(BZ_X_BCRC_1, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_2, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_3, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_4, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+
+      GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1);
+
+      s->origPtr = 0;
+      GET_UCHAR(BZ_X_ORIGPTR_1, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+      GET_UCHAR(BZ_X_ORIGPTR_2, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+      GET_UCHAR(BZ_X_ORIGPTR_3, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+
+      if (s->origPtr < 0)
+         RETURN(BZ_DATA_ERROR);
+      if (s->origPtr > 10 + 100000*s->blockSize100k) 
+         RETURN(BZ_DATA_ERROR);
+
+      /*--- Receive the mapping table ---*/
+      for (i = 0; i < 16; i++) {
+         GET_BIT(BZ_X_MAPPING_1, uc);
+         if (uc == 1) 
+            s->inUse16[i] = True; else 
+            s->inUse16[i] = False;
+      }
+
+      for (i = 0; i < 256; i++) s->inUse[i] = False;
+
+      for (i = 0; i < 16; i++)
+         if (s->inUse16[i])
+            for (j = 0; j < 16; j++) {
+               GET_BIT(BZ_X_MAPPING_2, uc);
+               if (uc == 1) s->inUse[i * 16 + j] = True;
+            }
+      makeMaps_d ( s );
+      if (s->nInUse == 0) RETURN(BZ_DATA_ERROR);
+      alphaSize = s->nInUse+2;
+
+      /*--- Now the selectors ---*/
+      GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
+      if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
+      GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
+      if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
+      for (i = 0; i < nSelectors; i++) {
+         j = 0;
+         while (True) {
+            GET_BIT(BZ_X_SELECTOR_3, uc);
+            if (uc == 0) break;
+            j++;
+            if (j >= nGroups) RETURN(BZ_DATA_ERROR);
+         }
+         s->selectorMtf[i] = j;
+      }
+
+      /*--- Undo the MTF values for the selectors. ---*/
+      {
+         UChar pos[BZ_N_GROUPS], tmp, v;
+         for (v = 0; v < nGroups; v++) pos[v] = v;
+   
+         for (i = 0; i < nSelectors; i++) {
+            v = s->selectorMtf[i];
+            tmp = pos[v];
+            while (v > 0) { pos[v] = pos[v-1]; v--; }
+            pos[0] = tmp;
+            s->selector[i] = tmp;
+         }
+      }
+
+      /*--- Now the coding tables ---*/
+      for (t = 0; t < nGroups; t++) {
+         GET_BITS(BZ_X_CODING_1, curr, 5);
+         for (i = 0; i < alphaSize; i++) {
+            while (True) {
+               if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR);
+               GET_BIT(BZ_X_CODING_2, uc);
+               if (uc == 0) break;
+               GET_BIT(BZ_X_CODING_3, uc);
+               if (uc == 0) curr++; else curr--;
+            }
+            s->len[t][i] = curr;
+         }
+      }
+
+      /*--- Create the Huffman decoding tables ---*/
+      for (t = 0; t < nGroups; t++) {
+         minLen = 32;
+         maxLen = 0;
+         for (i = 0; i < alphaSize; i++) {
+            if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
+            if (s->len[t][i] < minLen) minLen = s->len[t][i];
+         }
+         BZ2_hbCreateDecodeTables ( 
+            &(s->limit[t][0]), 
+            &(s->base[t][0]), 
+            &(s->perm[t][0]), 
+            &(s->len[t][0]),
+            minLen, maxLen, alphaSize
+         );
+         s->minLens[t] = minLen;
+      }
+
+      /*--- Now the MTF values ---*/
+
+      EOB      = s->nInUse+1;
+      nblockMAX = 100000 * s->blockSize100k;
+      groupNo  = -1;
+      groupPos = 0;
+
+      for (i = 0; i <= 255; i++) s->unzftab[i] = 0;
+
+      /*-- MTF init --*/
+      {
+         Int32 ii, jj, kk;
+         kk = MTFA_SIZE-1;
+         for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) {
+            for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
+               s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj);
+               kk--;
+            }
+            s->mtfbase[ii] = kk + 1;
+         }
+      }
+      /*-- end MTF init --*/
+
+      nblock = 0;
+      GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym);
+
+      while (True) {
+
+         if (nextSym == EOB) break;
+
+         if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
+
+            es = -1;
+            N = 1;
+            do {
+               /* Check that N doesn't get too big, so that es doesn't
+                  go negative.  The maximum value that can be
+                  RUNA/RUNB encoded is equal to the block size (post
+                  the initial RLE), viz, 900k, so bounding N at 2
+                  million should guard against overflow without
+                  rejecting any legitimate inputs. */
+               if (N >= 2*1024*1024) RETURN(BZ_DATA_ERROR);
+               if (nextSym == BZ_RUNA) es = es + (0+1) * N; else
+               if (nextSym == BZ_RUNB) es = es + (1+1) * N;
+               N = N * 2;
+               GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym);
+            }
+               while (nextSym == BZ_RUNA || nextSym == BZ_RUNB);
+
+            es++;
+            uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ];
+            s->unzftab[uc] += es;
+
+            if (s->smallDecompress)
+               while (es > 0) {
+                  if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+                  s->ll16[nblock] = (UInt16)uc;
+                  nblock++;
+                  es--;
+               }
+            else
+               while (es > 0) {
+                  if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+                  s->tt[nblock] = (UInt32)uc;
+                  nblock++;
+                  es--;
+               };
+
+            continue;
+
+         } else {
+
+            if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+
+            /*-- uc = MTF ( nextSym-1 ) --*/
+            {
+               Int32 ii, jj, kk, pp, lno, off;
+               UInt32 nn;
+               nn = (UInt32)(nextSym - 1);
+
+               if (nn < MTFL_SIZE) {
+                  /* avoid general-case expense */
+                  pp = s->mtfbase[0];
+                  uc = s->mtfa[pp+nn];
+                  while (nn > 3) {
+                     Int32 z = pp+nn;
+                     s->mtfa[(z)  ] = s->mtfa[(z)-1];
+                     s->mtfa[(z)-1] = s->mtfa[(z)-2];
+                     s->mtfa[(z)-2] = s->mtfa[(z)-3];
+                     s->mtfa[(z)-3] = s->mtfa[(z)-4];
+                     nn -= 4;
+                  }
+                  while (nn > 0) { 
+                     s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--; 
+                  };
+                  s->mtfa[pp] = uc;
+               } else { 
+                  /* general case */
+                  lno = nn / MTFL_SIZE;
+                  off = nn % MTFL_SIZE;
+                  pp = s->mtfbase[lno] + off;
+                  uc = s->mtfa[pp];
+                  while (pp > s->mtfbase[lno]) { 
+                     s->mtfa[pp] = s->mtfa[pp-1]; pp--; 
+                  };
+                  s->mtfbase[lno]++;
+                  while (lno > 0) {
+                     s->mtfbase[lno]--;
+                     s->mtfa[s->mtfbase[lno]] 
+                        = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1];
+                     lno--;
+                  }
+                  s->mtfbase[0]--;
+                  s->mtfa[s->mtfbase[0]] = uc;
+                  if (s->mtfbase[0] == 0) {
+                     kk = MTFA_SIZE-1;
+                     for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) {
+                        for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
+                           s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj];
+                           kk--;
+                        }
+                        s->mtfbase[ii] = kk + 1;
+                     }
+                  }
+               }
+            }
+            /*-- end uc = MTF ( nextSym-1 ) --*/
+
+            s->unzftab[s->seqToUnseq[uc]]++;
+            if (s->smallDecompress)
+               s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]); else
+               s->tt[nblock]   = (UInt32)(s->seqToUnseq[uc]);
+            nblock++;
+
+            GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym);
+            continue;
+         }
+      }
+
+      /* Now we know what nblock is, we can do a better sanity
+         check on s->origPtr.
+      */
+      if (s->origPtr < 0 || s->origPtr >= nblock)
+         RETURN(BZ_DATA_ERROR);
+
+      /*-- Set up cftab to facilitate generation of T^(-1) --*/
+      /* Check: unzftab entries in range. */
+      for (i = 0; i <= 255; i++) {
+         if (s->unzftab[i] < 0 || s->unzftab[i] > nblock)
+            RETURN(BZ_DATA_ERROR);
+      }
+      /* Actually generate cftab. */
+      s->cftab[0] = 0;
+      for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
+      for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
+      /* Check: cftab entries in range. */
+      for (i = 0; i <= 256; i++) {
+         if (s->cftab[i] < 0 || s->cftab[i] > nblock) {
+            /* s->cftab[i] can legitimately be == nblock */
+            RETURN(BZ_DATA_ERROR);
+         }
+      }
+      /* Check: cftab entries non-descending. */
+      for (i = 1; i <= 256; i++) {
+         if (s->cftab[i-1] > s->cftab[i]) {
+            RETURN(BZ_DATA_ERROR);
+         }
+      }
+
+      s->state_out_len = 0;
+      s->state_out_ch  = 0;
+      BZ_INITIALISE_CRC ( s->calculatedBlockCRC );
+      s->state = BZ_X_OUTPUT;
+      if (s->verbosity >= 2) VPrintf0 ( "rt+rld" );
+
+      if (s->smallDecompress) {
+
+         /*-- Make a copy of cftab, used in generation of T --*/
+         for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i];
+
+         /*-- compute the T vector --*/
+         for (i = 0; i < nblock; i++) {
+            uc = (UChar)(s->ll16[i]);
+            SET_LL(i, s->cftabCopy[uc]);
+            s->cftabCopy[uc]++;
+         }
+
+         /*-- Compute T^(-1) by pointer reversal on T --*/
+         i = s->origPtr;
+         j = GET_LL(i);
+         do {
+            Int32 tmp = GET_LL(j);
+            SET_LL(j, i);
+            i = j;
+            j = tmp;
+         }
+            while (i != s->origPtr);
+
+         s->tPos = s->origPtr;
+         s->nblock_used = 0;
+         if (s->blockRandomised) {
+            BZ_RAND_INIT_MASK;
+            BZ_GET_SMALL(s->k0); s->nblock_used++;
+            BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; 
+         } else {
+            BZ_GET_SMALL(s->k0); s->nblock_used++;
+         }
+
+      } else {
+
+         /*-- compute the T^(-1) vector --*/
+         for (i = 0; i < nblock; i++) {
+            uc = (UChar)(s->tt[i] & 0xff);
+            s->tt[s->cftab[uc]] |= (i << 8);
+            s->cftab[uc]++;
+         }
+
+         s->tPos = s->tt[s->origPtr] >> 8;
+         s->nblock_used = 0;
+         if (s->blockRandomised) {
+            BZ_RAND_INIT_MASK;
+            BZ_GET_FAST(s->k0); s->nblock_used++;
+            BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; 
+         } else {
+            BZ_GET_FAST(s->k0); s->nblock_used++;
+         }
+
+      }
+
+      RETURN(BZ_OK);
+
+
+
+    endhdr_2:
+
+      GET_UCHAR(BZ_X_ENDHDR_2, uc);
+      if (uc != 0x72) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_3, uc);
+      if (uc != 0x45) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_4, uc);
+      if (uc != 0x38) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_5, uc);
+      if (uc != 0x50) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_6, uc);
+      if (uc != 0x90) RETURN(BZ_DATA_ERROR);
+
+      s->storedCombinedCRC = 0;
+      GET_UCHAR(BZ_X_CCRC_1, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_2, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_3, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_4, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+
+      s->state = BZ_X_IDLE;
+      RETURN(BZ_STREAM_END);
+
+      default: AssertH ( False, 4001 );
+   }
+
+   AssertH ( False, 4002 );
+
+   save_state_and_return:
+
+   s->save_i           = i;
+   s->save_j           = j;
+   s->save_t           = t;
+   s->save_alphaSize   = alphaSize;
+   s->save_nGroups     = nGroups;
+   s->save_nSelectors  = nSelectors;
+   s->save_EOB         = EOB;
+   s->save_groupNo     = groupNo;
+   s->save_groupPos    = groupPos;
+   s->save_nextSym     = nextSym;
+   s->save_nblockMAX   = nblockMAX;
+   s->save_nblock      = nblock;
+   s->save_es          = es;
+   s->save_N           = N;
+   s->save_curr        = curr;
+   s->save_zt          = zt;
+   s->save_zn          = zn;
+   s->save_zvec        = zvec;
+   s->save_zj          = zj;
+   s->save_gSel        = gSel;
+   s->save_gMinlen     = gMinlen;
+   s->save_gLimit      = gLimit;
+   s->save_gBase       = gBase;
+   s->save_gPerm       = gPerm;
+
+   return retVal;   
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                      decompress.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/patchlib/huffman.c b/patchlib/huffman.c
new file mode 100644
index 00000000..2283fdbc
--- /dev/null
+++ b/patchlib/huffman.c
@@ -0,0 +1,205 @@
+
+/*-------------------------------------------------------------*/
+/*--- Huffman coding low-level stuff                        ---*/
+/*---                                             huffman.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include "bzlib_private.h"
+
+/*---------------------------------------------------*/
+#define WEIGHTOF(zz0)  ((zz0) & 0xffffff00)
+#define DEPTHOF(zz1)   ((zz1) & 0x000000ff)
+#define MYMAX(zz2,zz3) ((zz2) > (zz3) ? (zz2) : (zz3))
+
+#define ADDWEIGHTS(zw1,zw2)                           \
+   (WEIGHTOF(zw1)+WEIGHTOF(zw2)) |                    \
+   (1 + MYMAX(DEPTHOF(zw1),DEPTHOF(zw2)))
+
+#define UPHEAP(z)                                     \
+{                                                     \
+   Int32 zz, tmp;                                     \
+   zz = z; tmp = heap[zz];                            \
+   while (weight[tmp] < weight[heap[zz >> 1]]) {      \
+      heap[zz] = heap[zz >> 1];                       \
+      zz >>= 1;                                       \
+   }                                                  \
+   heap[zz] = tmp;                                    \
+}
+
+#define DOWNHEAP(z)                                   \
+{                                                     \
+   Int32 zz, yy, tmp;                                 \
+   zz = z; tmp = heap[zz];                            \
+   while (True) {                                     \
+      yy = zz << 1;                                   \
+      if (yy > nHeap) break;                          \
+      if (yy < nHeap &&                               \
+          weight[heap[yy+1]] < weight[heap[yy]])      \
+         yy++;                                        \
+      if (weight[tmp] < weight[heap[yy]]) break;      \
+      heap[zz] = heap[yy];                            \
+      zz = yy;                                        \
+   }                                                  \
+   heap[zz] = tmp;                                    \
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbMakeCodeLengths ( UChar *len, 
+                             Int32 *freq,
+                             Int32 alphaSize,
+                             Int32 maxLen )
+{
+   /*--
+      Nodes and heap entries run from 1.  Entry 0
+      for both the heap and nodes is a sentinel.
+   --*/
+   Int32 nNodes, nHeap, n1, n2, i, j, k;
+   Bool  tooLong;
+
+   Int32 heap   [ BZ_MAX_ALPHA_SIZE + 2 ];
+   Int32 weight [ BZ_MAX_ALPHA_SIZE * 2 ];
+   Int32 parent [ BZ_MAX_ALPHA_SIZE * 2 ]; 
+
+   for (i = 0; i < alphaSize; i++)
+      weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8;
+
+   while (True) {
+
+      nNodes = alphaSize;
+      nHeap = 0;
+
+      heap[0] = 0;
+      weight[0] = 0;
+      parent[0] = -2;
+
+      for (i = 1; i <= alphaSize; i++) {
+         parent[i] = -1;
+         nHeap++;
+         heap[nHeap] = i;
+         UPHEAP(nHeap);
+      }
+
+      AssertH( nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001 );
+   
+      while (nHeap > 1) {
+         n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+         n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+         nNodes++;
+         parent[n1] = parent[n2] = nNodes;
+         weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]);
+         parent[nNodes] = -1;
+         nHeap++;
+         heap[nHeap] = nNodes;
+         UPHEAP(nHeap);
+      }
+
+      AssertH( nNodes < (BZ_MAX_ALPHA_SIZE * 2), 2002 );
+
+      tooLong = False;
+      for (i = 1; i <= alphaSize; i++) {
+         j = 0;
+         k = i;
+         while (parent[k] >= 0) { k = parent[k]; j++; }
+         len[i-1] = j;
+         if (j > maxLen) tooLong = True;
+      }
+      
+      if (! tooLong) break;
+
+      /* 17 Oct 04: keep-going condition for the following loop used
+         to be 'i < alphaSize', which missed the last element,
+         theoretically leading to the possibility of the compressor
+         looping.  However, this count-scaling step is only needed if
+         one of the generated Huffman code words is longer than
+         maxLen, which up to and including version 1.0.2 was 20 bits,
+         which is extremely unlikely.  In version 1.0.3 maxLen was
+         changed to 17 bits, which has minimal effect on compression
+         ratio, but does mean this scaling step is used from time to
+         time, enough to verify that it works.
+
+         This means that bzip2-1.0.3 and later will only produce
+         Huffman codes with a maximum length of 17 bits.  However, in
+         order to preserve backwards compatibility with bitstreams
+         produced by versions pre-1.0.3, the decompressor must still
+         handle lengths of up to 20. */
+
+      for (i = 1; i <= alphaSize; i++) {
+         j = weight[i] >> 8;
+         j = 1 + (j / 2);
+         weight[i] = j << 8;
+      }
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbAssignCodes ( Int32 *code,
+                         UChar *length,
+                         Int32 minLen,
+                         Int32 maxLen,
+                         Int32 alphaSize )
+{
+   Int32 n, vec, i;
+
+   vec = 0;
+   for (n = minLen; n <= maxLen; n++) {
+      for (i = 0; i < alphaSize; i++)
+         if (length[i] == n) { code[i] = vec; vec++; };
+      vec <<= 1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbCreateDecodeTables ( Int32 *limit,
+                                Int32 *base,
+                                Int32 *perm,
+                                UChar *length,
+                                Int32 minLen,
+                                Int32 maxLen,
+                                Int32 alphaSize )
+{
+   Int32 pp, i, j, vec;
+
+   pp = 0;
+   for (i = minLen; i <= maxLen; i++)
+      for (j = 0; j < alphaSize; j++)
+         if (length[j] == i) { perm[pp] = j; pp++; };
+
+   for (i = 0; i < BZ_MAX_CODE_LEN; i++) base[i] = 0;
+   for (i = 0; i < alphaSize; i++) base[length[i]+1]++;
+
+   for (i = 1; i < BZ_MAX_CODE_LEN; i++) base[i] += base[i-1];
+
+   for (i = 0; i < BZ_MAX_CODE_LEN; i++) limit[i] = 0;
+   vec = 0;
+
+   for (i = minLen; i <= maxLen; i++) {
+      vec += (base[i+1] - base[i]);
+      limit[i] = vec-1;
+      vec <<= 1;
+   }
+   for (i = minLen + 1; i <= maxLen; i++)
+      base[i] = ((limit[i-1] + 1) << 1) - base[i];
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                         huffman.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/patchlib/randtable.c b/patchlib/randtable.c
new file mode 100644
index 00000000..6d624599
--- /dev/null
+++ b/patchlib/randtable.c
@@ -0,0 +1,84 @@
+
+/*-------------------------------------------------------------*/
+/*--- Table for randomising repetitive blocks               ---*/
+/*---                                           randtable.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.6 of 6 September 2010
+   Copyright (C) 1996-2010 Julian Seward <jseward@bzip.org>
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------*/
+Int32 BZ2_rNums[512] = { 
+   619, 720, 127, 481, 931, 816, 813, 233, 566, 247, 
+   985, 724, 205, 454, 863, 491, 741, 242, 949, 214, 
+   733, 859, 335, 708, 621, 574, 73, 654, 730, 472, 
+   419, 436, 278, 496, 867, 210, 399, 680, 480, 51, 
+   878, 465, 811, 169, 869, 675, 611, 697, 867, 561, 
+   862, 687, 507, 283, 482, 129, 807, 591, 733, 623, 
+   150, 238, 59, 379, 684, 877, 625, 169, 643, 105, 
+   170, 607, 520, 932, 727, 476, 693, 425, 174, 647, 
+   73, 122, 335, 530, 442, 853, 695, 249, 445, 515, 
+   909, 545, 703, 919, 874, 474, 882, 500, 594, 612, 
+   641, 801, 220, 162, 819, 984, 589, 513, 495, 799, 
+   161, 604, 958, 533, 221, 400, 386, 867, 600, 782, 
+   382, 596, 414, 171, 516, 375, 682, 485, 911, 276, 
+   98, 553, 163, 354, 666, 933, 424, 341, 533, 870, 
+   227, 730, 475, 186, 263, 647, 537, 686, 600, 224, 
+   469, 68, 770, 919, 190, 373, 294, 822, 808, 206, 
+   184, 943, 795, 384, 383, 461, 404, 758, 839, 887, 
+   715, 67, 618, 276, 204, 918, 873, 777, 604, 560, 
+   951, 160, 578, 722, 79, 804, 96, 409, 713, 940, 
+   652, 934, 970, 447, 318, 353, 859, 672, 112, 785, 
+   645, 863, 803, 350, 139, 93, 354, 99, 820, 908, 
+   609, 772, 154, 274, 580, 184, 79, 626, 630, 742, 
+   653, 282, 762, 623, 680, 81, 927, 626, 789, 125, 
+   411, 521, 938, 300, 821, 78, 343, 175, 128, 250, 
+   170, 774, 972, 275, 999, 639, 495, 78, 352, 126, 
+   857, 956, 358, 619, 580, 124, 737, 594, 701, 612, 
+   669, 112, 134, 694, 363, 992, 809, 743, 168, 974, 
+   944, 375, 748, 52, 600, 747, 642, 182, 862, 81, 
+   344, 805, 988, 739, 511, 655, 814, 334, 249, 515, 
+   897, 955, 664, 981, 649, 113, 974, 459, 893, 228, 
+   433, 837, 553, 268, 926, 240, 102, 654, 459, 51, 
+   686, 754, 806, 760, 493, 403, 415, 394, 687, 700, 
+   946, 670, 656, 610, 738, 392, 760, 799, 887, 653, 
+   978, 321, 576, 617, 626, 502, 894, 679, 243, 440, 
+   680, 879, 194, 572, 640, 724, 926, 56, 204, 700, 
+   707, 151, 457, 449, 797, 195, 791, 558, 945, 679, 
+   297, 59, 87, 824, 713, 663, 412, 693, 342, 606, 
+   134, 108, 571, 364, 631, 212, 174, 643, 304, 329, 
+   343, 97, 430, 751, 497, 314, 983, 374, 822, 928, 
+   140, 206, 73, 263, 980, 736, 876, 478, 430, 305, 
+   170, 514, 364, 692, 829, 82, 855, 953, 676, 246, 
+   369, 970, 294, 750, 807, 827, 150, 790, 288, 923, 
+   804, 378, 215, 828, 592, 281, 565, 555, 710, 82, 
+   896, 831, 547, 261, 524, 462, 293, 465, 502, 56, 
+   661, 821, 976, 991, 658, 869, 905, 758, 745, 193, 
+   768, 550, 608, 933, 378, 286, 215, 979, 792, 961, 
+   61, 688, 793, 644, 986, 403, 106, 366, 905, 644, 
+   372, 567, 466, 434, 645, 210, 389, 550, 919, 135, 
+   780, 773, 635, 389, 707, 100, 626, 958, 165, 504, 
+   920, 176, 193, 713, 857, 265, 203, 50, 668, 108, 
+   645, 990, 626, 197, 510, 357, 358, 850, 858, 364, 
+   936, 638
+};
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                       randtable.c ---*/
+/*-------------------------------------------------------------*/