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-rw-r--r--modules/zlib/src/inftrees.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/modules/zlib/src/inftrees.c b/modules/zlib/src/inftrees.c
index 44d89cf24..2ea08fc13 100644
--- a/modules/zlib/src/inftrees.c
+++ b/modules/zlib/src/inftrees.c
@@ -1,5 +1,5 @@
/* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -9,7 +9,7 @@
#define MAXBITS 15
const char inflate_copyright[] =
- " inflate 1.2.8 Copyright 1995-2013 Mark Adler ";
+ " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
/*
If you use the zlib library in a product, an acknowledgment is welcome
in the documentation of your product. If for some reason you cannot
@@ -54,7 +54,7 @@ unsigned short FAR *work;
code FAR *next; /* next available space in table */
const unsigned short FAR *base; /* base value table to use */
const unsigned short FAR *extra; /* extra bits table to use */
- int end; /* use base and extra for symbol > end */
+ unsigned match; /* use base and extra for symbol >= match */
unsigned short count[MAXBITS+1]; /* number of codes of each length */
unsigned short offs[MAXBITS+1]; /* offsets in table for each length */
static const unsigned short lbase[31] = { /* Length codes 257..285 base */
@@ -62,7 +62,7 @@ unsigned short FAR *work;
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
static const unsigned short lext[31] = { /* Length codes 257..285 extra */
16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
- 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78};
+ 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
@@ -181,19 +181,17 @@ unsigned short FAR *work;
switch (type) {
case CODES:
base = extra = work; /* dummy value--not used */
- end = 19;
+ match = 20;
break;
case LENS:
base = lbase;
- base -= 257;
extra = lext;
- extra -= 257;
- end = 256;
+ match = 257;
break;
- default: /* DISTS */
+ default: /* DISTS */
base = dbase;
extra = dext;
- end = -1;
+ match = 0;
}
/* initialize state for loop */
@@ -216,13 +214,13 @@ unsigned short FAR *work;
for (;;) {
/* create table entry */
here.bits = (unsigned char)(len - drop);
- if ((int)(work[sym]) < end) {
+ if (work[sym] + 1U < match) {
here.op = (unsigned char)0;
here.val = work[sym];
}
- else if ((int)(work[sym]) > end) {
- here.op = (unsigned char)(extra[work[sym]]);
- here.val = base[work[sym]];
+ else if (work[sym] >= match) {
+ here.op = (unsigned char)(extra[work[sym] - match]);
+ here.val = base[work[sym] - match];
}
else {
here.op = (unsigned char)(32 + 64); /* end of block */