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-rw-r--r--gfx/graphite2/src/Silf.cpp438
1 files changed, 438 insertions, 0 deletions
diff --git a/gfx/graphite2/src/Silf.cpp b/gfx/graphite2/src/Silf.cpp
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index 000000000..e36b50289
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+++ b/gfx/graphite2/src/Silf.cpp
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+/* GRAPHITE2 LICENSING
+
+ Copyright 2010, SIL International
+ All rights reserved.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should also have received a copy of the GNU Lesser General Public
+ License along with this library in the file named "LICENSE".
+ If not, write to the Free Software Foundation, 51 Franklin Street,
+ Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+ internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#include <cstdlib>
+#include "graphite2/Segment.h"
+#include "inc/debug.h"
+#include "inc/Endian.h"
+#include "inc/Silf.h"
+#include "inc/Segment.h"
+#include "inc/Rule.h"
+#include "inc/Error.h"
+
+
+using namespace graphite2;
+
+namespace { static const uint32 ERROROFFSET = 0xFFFFFFFF; }
+
+Silf::Silf() throw()
+: m_passes(0),
+ m_pseudos(0),
+ m_classOffsets(0),
+ m_classData(0),
+ m_justs(0),
+ m_numPasses(0),
+ m_numJusts(0),
+ m_sPass(0),
+ m_pPass(0),
+ m_jPass(0),
+ m_bPass(0),
+ m_flags(0),
+ m_dir(0),
+ m_aPseudo(0),
+ m_aBreak(0),
+ m_aUser(0),
+ m_aBidi(0),
+ m_aMirror(0),
+ m_aPassBits(0),
+ m_iMaxComp(0),
+ m_aCollision(0),
+ m_aLig(0),
+ m_numPseudo(0),
+ m_nClass(0),
+ m_nLinear(0),
+ m_gEndLine(0)
+{
+ memset(&m_silfinfo, 0, sizeof m_silfinfo);
+}
+
+Silf::~Silf() throw()
+{
+ releaseBuffers();
+}
+
+void Silf::releaseBuffers() throw()
+{
+ delete [] m_passes;
+ delete [] m_pseudos;
+ free(m_classOffsets);
+ free(m_classData);
+ free(m_justs);
+ m_passes= 0;
+ m_pseudos = 0;
+ m_classOffsets = 0;
+ m_classData = 0;
+ m_justs = 0;
+}
+
+
+bool Silf::readGraphite(const byte * const silf_start, size_t lSilf, Face& face, uint32 version)
+{
+ const byte * p = silf_start,
+ * const silf_end = p + lSilf;
+ Error e;
+
+ if (e.test(version >= 0x00060000, E_BADSILFVERSION))
+ {
+ releaseBuffers(); return face.error(e);
+ }
+ if (version >= 0x00030000)
+ {
+ if (e.test(lSilf < 28, E_BADSIZE)) { releaseBuffers(); return face.error(e); }
+ be::skip<int32>(p); // ruleVersion
+ be::skip<uint16>(p,2); // passOffset & pseudosOffset
+ }
+ else if (e.test(lSilf < 20, E_BADSIZE)) { releaseBuffers(); return face.error(e); }
+ const uint16 maxGlyph = be::read<uint16>(p);
+ m_silfinfo.extra_ascent = be::read<uint16>(p);
+ m_silfinfo.extra_descent = be::read<uint16>(p);
+ m_numPasses = be::read<uint8>(p);
+ m_sPass = be::read<uint8>(p);
+ m_pPass = be::read<uint8>(p);
+ m_jPass = be::read<uint8>(p);
+ m_bPass = be::read<uint8>(p);
+ m_flags = be::read<uint8>(p);
+ be::skip<uint8>(p,2); // max{Pre,Post}Context.
+ m_aPseudo = be::read<uint8>(p);
+ m_aBreak = be::read<uint8>(p);
+ m_aBidi = be::read<uint8>(p);
+ m_aMirror = be::read<uint8>(p);
+ m_aPassBits = be::read<uint8>(p);
+
+ // Read Justification levels.
+ m_numJusts = be::read<uint8>(p);
+ if (e.test(maxGlyph >= face.glyphs().numGlyphs(), E_BADMAXGLYPH)
+ || e.test(p + m_numJusts * 8 >= silf_end, E_BADNUMJUSTS))
+ {
+ releaseBuffers(); return face.error(e);
+ }
+
+ if (m_numJusts)
+ {
+ m_justs = gralloc<Justinfo>(m_numJusts);
+ if (e.test(!m_justs, E_OUTOFMEM)) return face.error(e);
+
+ for (uint8 i = 0; i < m_numJusts; i++)
+ {
+ ::new(m_justs + i) Justinfo(p[0], p[1], p[2], p[3]);
+ be::skip<byte>(p,8);
+ }
+ }
+
+ if (e.test(p + sizeof(uint16) + sizeof(uint8)*8 >= silf_end, E_BADENDJUSTS)) { releaseBuffers(); return face.error(e); }
+ m_aLig = be::read<uint16>(p);
+ m_aUser = be::read<uint8>(p);
+ m_iMaxComp = be::read<uint8>(p);
+ m_dir = be::read<uint8>(p) - 1;
+ m_aCollision = be::read<uint8>(p);
+ be::skip<byte>(p,3);
+ be::skip<uint16>(p, be::read<uint8>(p)); // don't need critical features yet
+ be::skip<byte>(p); // reserved
+ if (e.test(p >= silf_end, E_BADCRITFEATURES)) { releaseBuffers(); return face.error(e); }
+ be::skip<uint32>(p, be::read<uint8>(p)); // don't use scriptTag array.
+ if (e.test(p + sizeof(uint16) + sizeof(uint32) >= silf_end, E_BADSCRIPTTAGS)) { releaseBuffers(); return face.error(e); }
+ m_gEndLine = be::read<uint16>(p); // lbGID
+ const byte * o_passes = p;
+ uint32 passes_start = be::read<uint32>(p);
+
+ const size_t num_attrs = face.glyphs().numAttrs();
+ if (e.test(m_aPseudo >= num_attrs, E_BADAPSEUDO)
+ || e.test(m_aBreak >= num_attrs, E_BADABREAK)
+ || e.test(m_aBidi >= num_attrs, E_BADABIDI)
+ || e.test(m_aMirror>= num_attrs, E_BADAMIRROR)
+ || e.test(m_aCollision && m_aCollision >= num_attrs - 5, E_BADACOLLISION)
+ || e.test(m_numPasses > 128, E_BADNUMPASSES) || e.test(passes_start >= lSilf, E_BADPASSESSTART)
+ || e.test(m_pPass < m_sPass, E_BADPASSBOUND) || e.test(m_pPass > m_numPasses, E_BADPPASS) || e.test(m_sPass > m_numPasses, E_BADSPASS)
+ || e.test(m_jPass < m_pPass, E_BADJPASSBOUND) || e.test(m_jPass > m_numPasses, E_BADJPASS)
+ || e.test((m_bPass != 0xFF && (m_bPass < m_jPass || m_bPass > m_numPasses)), E_BADBPASS)
+ || e.test(m_aLig > 127, E_BADALIG))
+ {
+ releaseBuffers();
+ return face.error(e);
+ }
+ be::skip<uint32>(p, m_numPasses);
+ if (e.test(unsigned(p - silf_start) + sizeof(uint16) >= passes_start, E_BADPASSESSTART)) { releaseBuffers(); return face.error(e); }
+ m_numPseudo = be::read<uint16>(p);
+ be::skip<uint16>(p, 3); // searchPseudo, pseudoSelector, pseudoShift
+ m_pseudos = new Pseudo[m_numPseudo];
+ if (e.test(unsigned(p - silf_start) + m_numPseudo*(sizeof(uint32) + sizeof(uint16)) >= passes_start, E_BADNUMPSEUDO)
+ || e.test(!m_pseudos, E_OUTOFMEM))
+ {
+ releaseBuffers(); return face.error(e);
+ }
+ for (int i = 0; i < m_numPseudo; i++)
+ {
+ m_pseudos[i].uid = be::read<uint32>(p);
+ m_pseudos[i].gid = be::read<uint16>(p);
+ }
+
+ const size_t clen = readClassMap(p, passes_start + silf_start - p, version, e);
+ m_passes = new Pass[m_numPasses];
+ if (e || e.test(clen > unsigned(passes_start + silf_start - p), E_BADPASSESSTART)
+ || e.test(!m_passes, E_OUTOFMEM))
+ { releaseBuffers(); return face.error(e); }
+
+ for (size_t i = 0; i < m_numPasses; ++i)
+ {
+ uint32 pass_start = be::read<uint32>(o_passes);
+ uint32 pass_end = be::peek<uint32>(o_passes);
+ face.error_context((face.error_context() & 0xFF00) + EC_ASILF + (i << 16));
+ if (e.test(pass_start > pass_end, E_BADPASSSTART)
+ || e.test(pass_start < passes_start, E_BADPASSSTART)
+ || e.test(pass_end > lSilf, E_BADPASSEND)) {
+ releaseBuffers(); return face.error(e);
+ }
+
+ enum passtype pt = PASS_TYPE_UNKNOWN;
+ if (i >= m_jPass) pt = PASS_TYPE_JUSTIFICATION;
+ else if (i >= m_pPass) pt = PASS_TYPE_POSITIONING;
+ else if (i >= m_sPass) pt = PASS_TYPE_SUBSTITUTE;
+ else pt = PASS_TYPE_LINEBREAK;
+
+ m_passes[i].init(this);
+ if (!m_passes[i].readPass(silf_start + pass_start, pass_end - pass_start, pass_start, face, pt,
+ version, e))
+ {
+ releaseBuffers();
+ return false;
+ }
+ }
+
+ // fill in gr_faceinfo
+ m_silfinfo.upem = face.glyphs().unitsPerEm();
+ m_silfinfo.has_bidi_pass = (m_bPass != 0xFF);
+ m_silfinfo.justifies = (m_numJusts != 0) || (m_jPass < m_pPass);
+ m_silfinfo.line_ends = (m_flags & 1);
+ m_silfinfo.space_contextuals = gr_faceinfo::gr_space_contextuals((m_flags >> 2) & 0x7);
+ return true;
+}
+
+template<typename T> inline uint32 Silf::readClassOffsets(const byte *&p, size_t data_len, Error &e)
+{
+ const T cls_off = 2*sizeof(uint16) + sizeof(T)*(m_nClass+1);
+ const size_t max_off = (be::peek<T>(p + sizeof(T)*m_nClass) - cls_off)/sizeof(uint16);
+ // Check that the last+1 offset is less than or equal to the class map length.
+ if (e.test(be::peek<T>(p) != cls_off, E_MISALIGNEDCLASSES)
+ || e.test(max_off > (data_len - cls_off)/sizeof(uint16), E_HIGHCLASSOFFSET))
+ return ERROROFFSET;
+
+ // Read in all the offsets.
+ m_classOffsets = gralloc<uint32>(m_nClass+1);
+ if (e.test(!m_classOffsets, E_OUTOFMEM)) return ERROROFFSET;
+ for (uint32 * o = m_classOffsets, * const o_end = o + m_nClass + 1; o != o_end; ++o)
+ {
+ *o = (be::read<T>(p) - cls_off)/sizeof(uint16);
+ if (e.test(*o > max_off, E_HIGHCLASSOFFSET))
+ return ERROROFFSET;
+ }
+ return max_off;
+}
+
+size_t Silf::readClassMap(const byte *p, size_t data_len, uint32 version, Error &e)
+{
+ if (e.test(data_len < sizeof(uint16)*2, E_BADCLASSSIZE)) return ERROROFFSET;
+
+ m_nClass = be::read<uint16>(p);
+ m_nLinear = be::read<uint16>(p);
+
+ // Check that numLinear < numClass,
+ // that there is at least enough data for numClasses offsets.
+ if (e.test(m_nLinear > m_nClass, E_TOOMANYLINEAR)
+ || e.test((m_nClass + 1) * (version >= 0x00040000 ? sizeof(uint32) : sizeof(uint16)) > (data_len - 4), E_CLASSESTOOBIG))
+ return ERROROFFSET;
+
+ uint32 max_off;
+ if (version >= 0x00040000)
+ max_off = readClassOffsets<uint32>(p, data_len, e);
+ else
+ max_off = readClassOffsets<uint16>(p, data_len, e);
+
+ if (max_off == ERROROFFSET) return ERROROFFSET;
+
+ if (e.test((int)max_off < m_nLinear + (m_nClass - m_nLinear) * 6, E_CLASSESTOOBIG))
+ return ERROROFFSET;
+
+ // Check the linear offsets are sane, these must be monotonically increasing.
+ for (const uint32 *o = m_classOffsets, * const o_end = o + m_nLinear; o != o_end; ++o)
+ if (e.test(o[0] > o[1], E_BADCLASSOFFSET))
+ return ERROROFFSET;
+
+ // Fortunately the class data is all uint16s so we can decode these now
+ m_classData = gralloc<uint16>(max_off);
+ if (e.test(!m_classData, E_OUTOFMEM)) return ERROROFFSET;
+ for (uint16 *d = m_classData, * const d_end = d + max_off; d != d_end; ++d)
+ *d = be::read<uint16>(p);
+
+ // Check the lookup class invariants for each non-linear class
+ for (const uint32 *o = m_classOffsets + m_nLinear, * const o_end = m_classOffsets + m_nClass; o != o_end; ++o)
+ {
+ const uint16 * lookup = m_classData + *o;
+ if (e.test(*o + 4 > max_off, E_HIGHCLASSOFFSET) // LookupClass doesn't stretch over max_off
+ || e.test(lookup[0] == 0 // A LookupClass with no looks is a suspicious thing ...
+ || lookup[0] * 2 + *o + 4 > max_off // numIDs lookup pairs fits within (start of LookupClass' lookups array, max_off]
+ || lookup[3] + lookup[1] != lookup[0], E_BADCLASSLOOKUPINFO) // rangeShift: numIDs - searchRange
+ || e.test(((o[1] - *o) & 1) != 0, ERROROFFSET)) // glyphs are in pairs so difference must be even.
+ return ERROROFFSET;
+ }
+
+ return max_off;
+}
+
+uint16 Silf::findPseudo(uint32 uid) const
+{
+ for (int i = 0; i < m_numPseudo; i++)
+ if (m_pseudos[i].uid == uid) return m_pseudos[i].gid;
+ return 0;
+}
+
+uint16 Silf::findClassIndex(uint16 cid, uint16 gid) const
+{
+ if (cid > m_nClass) return -1;
+
+ const uint16 * cls = m_classData + m_classOffsets[cid];
+ if (cid < m_nLinear) // output class being used for input, shouldn't happen
+ {
+ for (unsigned int i = 0, n = m_classOffsets[cid + 1] - m_classOffsets[cid]; i < n; ++i, ++cls)
+ if (*cls == gid) return i;
+ return -1;
+ }
+ else
+ {
+ const uint16 * min = cls + 4, // lookups array
+ * max = min + cls[0]*2; // lookups aray is numIDs (cls[0]) uint16 pairs long
+ do
+ {
+ const uint16 * p = min + (-2 & ((max-min)/2));
+ if (p[0] > gid) max = p;
+ else min = p;
+ }
+ while (max - min > 2);
+ return min[0] == gid ? min[1] : -1;
+ }
+}
+
+uint16 Silf::getClassGlyph(uint16 cid, unsigned int index) const
+{
+ if (cid > m_nClass) return 0;
+
+ uint32 loc = m_classOffsets[cid];
+ if (cid < m_nLinear)
+ {
+ if (index < m_classOffsets[cid + 1] - loc)
+ return m_classData[index + loc];
+ }
+ else // input class being used for output. Shouldn't happen
+ {
+ for (unsigned int i = loc + 4; i < m_classOffsets[cid + 1]; i += 2)
+ if (m_classData[i + 1] == index) return m_classData[i];
+ }
+ return 0;
+}
+
+
+bool Silf::runGraphite(Segment *seg, uint8 firstPass, uint8 lastPass, int dobidi) const
+{
+ assert(seg != 0);
+ unsigned int maxSize = seg->slotCount() * MAX_SEG_GROWTH_FACTOR;
+ SlotMap map(*seg, m_dir, maxSize);
+ FiniteStateMachine fsm(map, seg->getFace()->logger());
+ vm::Machine m(map);
+ uint8 lbidi = m_bPass;
+#if !defined GRAPHITE2_NTRACING
+ json * const dbgout = seg->getFace()->logger();
+#endif
+
+ if (lastPass == 0)
+ {
+ if (firstPass == lastPass && lbidi == 0xFF)
+ return true;
+ lastPass = m_numPasses;
+ }
+ if ((firstPass < lbidi || (dobidi && firstPass == lbidi)) && (lastPass >= lbidi || (dobidi && lastPass + 1 == lbidi)))
+ lastPass++;
+ else
+ lbidi = 0xFF;
+
+ for (size_t i = firstPass; i < lastPass; ++i)
+ {
+ // bidi and mirroring
+ if (i == lbidi)
+ {
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ {
+ *dbgout << json::item << json::object
+// << "pindex" << i // for debugging
+ << "id" << -1
+ << "slotsdir" << (seg->currdir() ? "rtl" : "ltr")
+ << "passdir" << (m_dir & 1 ? "rtl" : "ltr")
+ << "slots" << json::array;
+ seg->positionSlots(0, 0, 0, seg->currdir());
+ for(Slot * s = seg->first(); s; s = s->next())
+ *dbgout << dslot(seg, s);
+ *dbgout << json::close
+ << "rules" << json::array << json::close
+ << json::close;
+ }
+#endif
+ if (seg->currdir() != (m_dir & 1))
+ seg->reverseSlots();
+ if (m_aMirror && (seg->dir() & 3) == 3)
+ seg->doMirror(m_aMirror);
+ --i;
+ lbidi = lastPass;
+ --lastPass;
+ continue;
+ }
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ {
+ *dbgout << json::item << json::object
+// << "pindex" << i // for debugging
+ << "id" << i+1
+ << "slotsdir" << (seg->currdir() ? "rtl" : "ltr")
+ << "passdir" << ((m_dir & 1) ^ m_passes[i].reverseDir() ? "rtl" : "ltr")
+ << "slots" << json::array;
+ seg->positionSlots(0, 0, 0, seg->currdir());
+ for(Slot * s = seg->first(); s; s = s->next())
+ *dbgout << dslot(seg, s);
+ *dbgout << json::close;
+ }
+#endif
+
+ // test whether to reorder, prepare for positioning
+ bool reverse = (lbidi == 0xFF) && (seg->currdir() != ((m_dir & 1) ^ m_passes[i].reverseDir()));
+ if ((i >= 32 || (seg->passBits() & (1 << i)) == 0 || m_passes[i].collisionLoops())
+ && !m_passes[i].runGraphite(m, fsm, reverse))
+ return false;
+ // only subsitution passes can change segment length, cached subsegments are short for their text
+ if (m.status() != vm::Machine::finished
+ || (seg->slotCount() && seg->slotCount() > maxSize))
+ return false;
+ }
+ return true;
+}
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