diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/unzip.c | 55 |
1 files changed, 29 insertions, 26 deletions
diff --git a/libbb/unzip.c b/libbb/unzip.c index a747bae..6c3f322 100644 --- a/libbb/unzip.c +++ b/libbb/unzip.c @@ -186,6 +186,8 @@ static int huft_free(huft_t *t) return 0; } +typedef unsigned char extra_bits_t; + /* Given a list of code lengths and a maximum table size, make a set of * tables to decode that set of codes. Return zero on success, one if * the given code set is incomplete (the tables are still built in this @@ -201,7 +203,7 @@ static int huft_free(huft_t *t) * m: maximum lookup bits, returns actual */ static int huft_build(unsigned int *b, const unsigned int n, const unsigned int s, - const unsigned short *d, const unsigned short *e, huft_t **t, int *m) + const unsigned short *d, const extra_bits_t *e, huft_t **t, int *m) { unsigned a; /* counter for codes of length k */ unsigned c[BMAX + 1]; /* bit length count table */ @@ -489,6 +491,30 @@ static int inflate_codes(huft_t *tl, huft_t *td, int bl, int bd) return 0; } +static const unsigned short cplens[] = { /* Copy lengths for literal codes 257..285 */ + 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, + 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 +}; +/* note: see note #13 above about the 258 in this list. */ +static const extra_bits_t cplext[] = { /* Extra bits for literal codes 257..285 */ + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99 +}; /* 99==invalid */ +static const unsigned short cpdist[] = { /* Copy offsets for distance codes 0..29 */ + 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, + 8193, 12289, 16385, 24577 +}; +static const extra_bits_t cpdext[] = { /* Extra bits for distance codes */ + 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, + 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, + 12, 12, 13, 13 +}; +/* Tables for deflate from PKZIP's appnote.txt. */ +static const extra_bits_t border[] = { /* Order of the bit length code lengths */ + 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 +}; + /* * decompress an inflated block * e: last block flag @@ -500,25 +526,6 @@ static int inflate_block(int *e) unsigned t; /* block type */ register unsigned long b; /* bit buffer */ register unsigned k; /* number of bits in bit buffer */ - static unsigned short cplens[] = { /* Copy lengths for literal codes 257..285 */ - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, - 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 - }; - /* note: see note #13 above about the 258 in this list. */ - static unsigned short cplext[] = { /* Extra bits for literal codes 257..285 */ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, - 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99 - }; /* 99==invalid */ - static unsigned short cpdist[] = { /* Copy offsets for distance codes 0..29 */ - 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, - 8193, 12289, 16385, 24577 - }; - static unsigned short cpdext[] = { /* Extra bits for distance codes */ - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, - 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, - 12, 12, 13, 13 - }; /* make local bit buffer */ b = bb; @@ -657,12 +664,8 @@ static int inflate_block(int *e) } case 2: /* Inflate dynamic */ { - /* Tables for deflate from PKZIP's appnote.txt. */ - static unsigned border[] = { /* Order of the bit length code lengths */ - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 - }; - int dbits = 6; /* bits in base distance lookup table */ - int lbits = 9; /* bits in base literal/length lookup table */ + const int dbits = 6; /* bits in base distance lookup table */ + const int lbits = 9; /* bits in base literal/length lookup table */ int i; /* temporary variables */ unsigned j; |