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1 /* inflate.h -- internal inflate state definition | 1 /* inflate.h -- internal inflate state definition |
2 * Copyright (C) 1995-2004 Mark Adler | 2 * Copyright (C) 1995-2009 Mark Adler |
3 * For conditions of distribution and use, see copyright notice in zlib.h | 3 * For conditions of distribution and use, see copyright notice in zlib.h |
4 */ | 4 */ |
5 | 5 |
6 /* WARNING: this file should *not* be used by applications. It is | 6 /* WARNING: this file should *not* be used by applications. It is |
7 part of the implementation of the compression library and is | 7 part of the implementation of the compression library and is |
8 subject to change. Applications should only use zlib.h. | 8 subject to change. Applications should only use zlib.h. |
9 */ | 9 */ |
10 | 10 |
11 /* define NO_GZIP when compiling if you want to disable gzip header and | 11 /* define NO_GZIP when compiling if you want to disable gzip header and |
12 trailer decoding by inflate(). NO_GZIP would be used to avoid linking in | 12 trailer decoding by inflate(). NO_GZIP would be used to avoid linking in |
(...skipping 12 matching lines...) Expand all Loading... |
25 EXLEN, /* i: waiting for extra length (gzip) */ | 25 EXLEN, /* i: waiting for extra length (gzip) */ |
26 EXTRA, /* i: waiting for extra bytes (gzip) */ | 26 EXTRA, /* i: waiting for extra bytes (gzip) */ |
27 NAME, /* i: waiting for end of file name (gzip) */ | 27 NAME, /* i: waiting for end of file name (gzip) */ |
28 COMMENT, /* i: waiting for end of comment (gzip) */ | 28 COMMENT, /* i: waiting for end of comment (gzip) */ |
29 HCRC, /* i: waiting for header crc (gzip) */ | 29 HCRC, /* i: waiting for header crc (gzip) */ |
30 DICTID, /* i: waiting for dictionary check value */ | 30 DICTID, /* i: waiting for dictionary check value */ |
31 DICT, /* waiting for inflateSetDictionary() call */ | 31 DICT, /* waiting for inflateSetDictionary() call */ |
32 TYPE, /* i: waiting for type bits, including last-flag bit */ | 32 TYPE, /* i: waiting for type bits, including last-flag bit */ |
33 TYPEDO, /* i: same, but skip check to exit inflate on new block */ | 33 TYPEDO, /* i: same, but skip check to exit inflate on new block */ |
34 STORED, /* i: waiting for stored size (length and complement) */ | 34 STORED, /* i: waiting for stored size (length and complement) */ |
| 35 COPY_, /* i/o: same as COPY below, but only first time in */ |
35 COPY, /* i/o: waiting for input or output to copy stored block */ | 36 COPY, /* i/o: waiting for input or output to copy stored block */ |
36 TABLE, /* i: waiting for dynamic block table lengths */ | 37 TABLE, /* i: waiting for dynamic block table lengths */ |
37 LENLENS, /* i: waiting for code length code lengths */ | 38 LENLENS, /* i: waiting for code length code lengths */ |
38 CODELENS, /* i: waiting for length/lit and distance code lengths */ | 39 CODELENS, /* i: waiting for length/lit and distance code lengths */ |
39 LEN, /* i: waiting for length/lit code */ | 40 LEN_, /* i: same as LEN below, but only first time in */ |
| 41 LEN, /* i: waiting for length/lit/eob code */ |
40 LENEXT, /* i: waiting for length extra bits */ | 42 LENEXT, /* i: waiting for length extra bits */ |
41 DIST, /* i: waiting for distance code */ | 43 DIST, /* i: waiting for distance code */ |
42 DISTEXT, /* i: waiting for distance extra bits */ | 44 DISTEXT, /* i: waiting for distance extra bits */ |
43 MATCH, /* o: waiting for output space to copy string */ | 45 MATCH, /* o: waiting for output space to copy string */ |
44 LIT, /* o: waiting for output space to write literal */ | 46 LIT, /* o: waiting for output space to write literal */ |
45 CHECK, /* i: waiting for 32-bit check value */ | 47 CHECK, /* i: waiting for 32-bit check value */ |
46 LENGTH, /* i: waiting for 32-bit length (gzip) */ | 48 LENGTH, /* i: waiting for 32-bit length (gzip) */ |
47 DONE, /* finished check, done -- remain here until reset */ | 49 DONE, /* finished check, done -- remain here until reset */ |
48 BAD, /* got a data error -- remain here until reset */ | 50 BAD, /* got a data error -- remain here until reset */ |
49 MEM, /* got an inflate() memory error -- remain here until reset */ | 51 MEM, /* got an inflate() memory error -- remain here until reset */ |
50 SYNC /* looking for synchronization bytes to restart inflate() */ | 52 SYNC /* looking for synchronization bytes to restart inflate() */ |
51 } inflate_mode; | 53 } inflate_mode; |
52 | 54 |
53 /* | 55 /* |
54 State transitions between above modes - | 56 State transitions between above modes - |
55 | 57 |
56 (most modes can go to the BAD or MEM mode -- not shown for clarity) | 58 (most modes can go to BAD or MEM on error -- not shown for clarity) |
57 | 59 |
58 Process header: | 60 Process header: |
59 HEAD -> (gzip) or (zlib) | 61 HEAD -> (gzip) or (zlib) or (raw) |
60 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME | 62 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT -> |
61 NAME -> COMMENT -> HCRC -> TYPE | 63 HCRC -> TYPE |
62 (zlib) -> DICTID or TYPE | 64 (zlib) -> DICTID or TYPE |
63 DICTID -> DICT -> TYPE | 65 DICTID -> DICT -> TYPE |
| 66 (raw) -> TYPEDO |
64 Read deflate blocks: | 67 Read deflate blocks: |
65 TYPE -> STORED or TABLE or LEN or CHECK | 68 TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK |
66 STORED -> COPY -> TYPE | 69 STORED -> COPY_ -> COPY -> TYPE |
67 TABLE -> LENLENS -> CODELENS -> LEN | 70 TABLE -> LENLENS -> CODELENS -> LEN_ |
68 Read deflate codes: | 71 LEN_ -> LEN |
| 72 Read deflate codes in fixed or dynamic block: |
69 LEN -> LENEXT or LIT or TYPE | 73 LEN -> LENEXT or LIT or TYPE |
70 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN | 74 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN |
71 LIT -> LEN | 75 LIT -> LEN |
72 Process trailer: | 76 Process trailer: |
73 CHECK -> LENGTH -> DONE | 77 CHECK -> LENGTH -> DONE |
74 */ | 78 */ |
75 | 79 |
76 /* state maintained between inflate() calls. Approximately 7K bytes. */ | 80 /* state maintained between inflate() calls. Approximately 10K bytes. */ |
77 struct inflate_state { | 81 struct inflate_state { |
78 inflate_mode mode; /* current inflate mode */ | 82 inflate_mode mode; /* current inflate mode */ |
79 int last; /* true if processing last block */ | 83 int last; /* true if processing last block */ |
80 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */ | 84 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */ |
81 int havedict; /* true if dictionary provided */ | 85 int havedict; /* true if dictionary provided */ |
82 int flags; /* gzip header method and flags (0 if zlib) */ | 86 int flags; /* gzip header method and flags (0 if zlib) */ |
83 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */ | 87 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */ |
84 unsigned long check; /* protected copy of check value */ | 88 unsigned long check; /* protected copy of check value */ |
85 unsigned long total; /* protected copy of output count */ | 89 unsigned long total; /* protected copy of output count */ |
86 gz_headerp head; /* where to save gzip header information */ | 90 gz_headerp head; /* where to save gzip header information */ |
87 /* sliding window */ | 91 /* sliding window */ |
88 unsigned wbits; /* log base 2 of requested window size */ | 92 unsigned wbits; /* log base 2 of requested window size */ |
89 unsigned wsize; /* window size or zero if not using window */ | 93 unsigned wsize; /* window size or zero if not using window */ |
90 unsigned whave; /* valid bytes in the window */ | 94 unsigned whave; /* valid bytes in the window */ |
91 unsigned write; /* window write index */ | 95 unsigned wnext; /* window write index */ |
92 unsigned char FAR *window; /* allocated sliding window, if needed */ | 96 unsigned char FAR *window; /* allocated sliding window, if needed */ |
93 /* bit accumulator */ | 97 /* bit accumulator */ |
94 unsigned long hold; /* input bit accumulator */ | 98 unsigned long hold; /* input bit accumulator */ |
95 unsigned bits; /* number of bits in "in" */ | 99 unsigned bits; /* number of bits in "in" */ |
96 /* for string and stored block copying */ | 100 /* for string and stored block copying */ |
97 unsigned length; /* literal or length of data to copy */ | 101 unsigned length; /* literal or length of data to copy */ |
98 unsigned offset; /* distance back to copy string from */ | 102 unsigned offset; /* distance back to copy string from */ |
99 /* for table and code decoding */ | 103 /* for table and code decoding */ |
100 unsigned extra; /* extra bits needed */ | 104 unsigned extra; /* extra bits needed */ |
101 /* fixed and dynamic code tables */ | 105 /* fixed and dynamic code tables */ |
102 code const FAR *lencode; /* starting table for length/literal codes */ | 106 code const FAR *lencode; /* starting table for length/literal codes */ |
103 code const FAR *distcode; /* starting table for distance codes */ | 107 code const FAR *distcode; /* starting table for distance codes */ |
104 unsigned lenbits; /* index bits for lencode */ | 108 unsigned lenbits; /* index bits for lencode */ |
105 unsigned distbits; /* index bits for distcode */ | 109 unsigned distbits; /* index bits for distcode */ |
106 /* dynamic table building */ | 110 /* dynamic table building */ |
107 unsigned ncode; /* number of code length code lengths */ | 111 unsigned ncode; /* number of code length code lengths */ |
108 unsigned nlen; /* number of length code lengths */ | 112 unsigned nlen; /* number of length code lengths */ |
109 unsigned ndist; /* number of distance code lengths */ | 113 unsigned ndist; /* number of distance code lengths */ |
110 unsigned have; /* number of code lengths in lens[] */ | 114 unsigned have; /* number of code lengths in lens[] */ |
111 code FAR *next; /* next available space in codes[] */ | 115 code FAR *next; /* next available space in codes[] */ |
112 unsigned short lens[320]; /* temporary storage for code lengths */ | 116 unsigned short lens[320]; /* temporary storage for code lengths */ |
113 unsigned short work[288]; /* work area for code table building */ | 117 unsigned short work[288]; /* work area for code table building */ |
114 code codes[ENOUGH]; /* space for code tables */ | 118 code codes[ENOUGH]; /* space for code tables */ |
| 119 int sane; /* if false, allow invalid distance too far */ |
| 120 int back; /* bits back of last unprocessed length/lit */ |
| 121 unsigned was; /* initial length of match */ |
115 }; | 122 }; |
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