diff options
| -rw-r--r-- | lib/zlib/inftrees.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/lib/zlib/inftrees.c b/lib/zlib/inftrees.c index b71b9695a8..caee502f88 100644 --- a/lib/zlib/inftrees.c +++ b/lib/zlib/inftrees.c @@ -50,7 +50,7 @@ int inflate_table(codetype type, unsigned short FAR *lens, unsigned codes, 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 */ @@ -178,19 +178,17 @@ int inflate_table(codetype type, unsigned short FAR *lens, unsigned codes, 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 */ base = dbase; extra = dext; - end = -1; + match = 0; } /* initialize state for loop */ @@ -212,13 +210,12 @@ int inflate_table(codetype type, unsigned short FAR *lens, unsigned codes, for (;;) { /* create table entry */ this.bits = (unsigned char)(len - drop); - if ((int)(work[sym]) < end) { + if (work[sym] + 1 < match) { this.op = (unsigned char)0; this.val = work[sym]; - } - else if ((int)(work[sym]) > end) { - this.op = (unsigned char)(extra[work[sym]]); - this.val = base[work[sym]]; + } else if (work[sym] >= match) { + this.op = (unsigned char)(extra[work[sym] - match]); + this.val = base[work[sym] - match]; } else { this.op = (unsigned char)(32 + 64); /* end of block */ |