diff options
Diffstat (limited to 'cpan/Compress-Raw-Zlib/zlib-src/inftrees.c')
| -rw-r--r-- | cpan/Compress-Raw-Zlib/zlib-src/inftrees.c | 60 |
1 files changed, 18 insertions, 42 deletions
diff --git a/cpan/Compress-Raw-Zlib/zlib-src/inftrees.c b/cpan/Compress-Raw-Zlib/zlib-src/inftrees.c index b0b60f9702..60bbd58bfb 100644 --- a/cpan/Compress-Raw-Zlib/zlib-src/inftrees.c +++ b/cpan/Compress-Raw-Zlib/zlib-src/inftrees.c @@ -1,5 +1,5 @@ /* inftrees.c -- generate Huffman trees for efficient decoding - * Copyright (C) 1995-2010 Mark Adler + * Copyright (C) 1995-2012 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 1.2.5 Copyright 1995-2010 Mark Adler "; + " inflate 1.2.6 Copyright 1995-2012 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 @@ -29,13 +29,13 @@ const char inflate_copyright[] = table index bits. It will differ if the request is greater than the longest code or if it is less than the shortest code. */ -int ZLIB_INTERNAL inflate_table( - codetype type, - unsigned short FAR *lens, - unsigned codes, - code FAR * FAR *table, - unsigned FAR *bits, - unsigned short FAR *work) +int ZLIB_INTERNAL inflate_table(type, lens, codes, table, bits, work) +codetype type; +unsigned short FAR *lens; +unsigned codes; +code FAR * FAR *table; +unsigned FAR *bits; +unsigned short FAR *work; { unsigned len; /* a code's length in bits */ unsigned sym; /* index of code symbols */ @@ -62,7 +62,7 @@ int ZLIB_INTERNAL inflate_table( 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, 73, 195}; + 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 203, 69}; 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, @@ -289,38 +289,14 @@ int ZLIB_INTERNAL inflate_table( } } - /* - Fill in rest of table for incomplete codes. This loop is similar to the - loop above in incrementing huff for table indices. It is assumed that - len is equal to curr + drop, so there is no loop needed to increment - through high index bits. When the current sub-table is filled, the loop - drops back to the root table to fill in any remaining entries there. - */ - here.op = (unsigned char)64; /* invalid code marker */ - here.bits = (unsigned char)(len - drop); - here.val = (unsigned short)0; - while (huff != 0) { - /* when done with sub-table, drop back to root table */ - if (drop != 0 && (huff & mask) != low) { - drop = 0; - len = root; - next = *table; - here.bits = (unsigned char)len; - } - - /* put invalid code marker in table */ - next[huff >> drop] = here; - - /* backwards increment the len-bit code huff */ - incr = 1U << (len - 1); - while (huff & incr) - incr >>= 1; - if (incr != 0) { - huff &= incr - 1; - huff += incr; - } - else - huff = 0; + /* fill in remaining table entry if code is incomplete (guaranteed to have + at most one remaining entry, since if the code is incomplete, the + maximum code length that was allowed to get this far is one bit) */ + if (huff != 0) { + here.op = (unsigned char)64; /* invalid code marker */ + here.bits = (unsigned char)(len - drop); + here.val = (unsigned short)0; + next[huff] = here; } /* set return parameters */ |