inflate.h (180208) | inflate.h (205471) |
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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 4 */ 5 6/* WARNING: this file should *not* be used by applications. It is 7 part of the implementation of the compression library and is 8 subject to change. Applications should only use zlib.h. 9 */ 10 --- 16 unchanged lines hidden (view full) --- 27 NAME, /* i: waiting for end of file name (gzip) */ 28 COMMENT, /* i: waiting for end of comment (gzip) */ 29 HCRC, /* i: waiting for header crc (gzip) */ 30 DICTID, /* i: waiting for dictionary check value */ 31 DICT, /* waiting for inflateSetDictionary() call */ 32 TYPE, /* i: waiting for type bits, including last-flag bit */ 33 TYPEDO, /* i: same, but skip check to exit inflate on new block */ 34 STORED, /* i: waiting for stored size (length and complement) */ | 3 * For conditions of distribution and use, see copyright notice in zlib.h 4 */ 5 6/* WARNING: this file should *not* be used by applications. It is 7 part of the implementation of the compression library and is 8 subject to change. Applications should only use zlib.h. 9 */ 10 --- 16 unchanged lines hidden (view full) --- 27 NAME, /* i: waiting for end of file name (gzip) */ 28 COMMENT, /* i: waiting for end of comment (gzip) */ 29 HCRC, /* i: waiting for header crc (gzip) */ 30 DICTID, /* i: waiting for dictionary check value */ 31 DICT, /* waiting for inflateSetDictionary() call */ 32 TYPE, /* i: waiting for type bits, including last-flag bit */ 33 TYPEDO, /* i: same, but skip check to exit inflate on new block */ 34 STORED, /* i: waiting for stored size (length and complement) */ |
35 COPY_, /* i/o: same as COPY below, but only first time in */ |
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35 COPY, /* i/o: waiting for input or output to copy stored block */ 36 TABLE, /* i: waiting for dynamic block table lengths */ 37 LENLENS, /* i: waiting for code length code lengths */ 38 CODELENS, /* i: waiting for length/lit and distance code lengths */ | 36 COPY, /* i/o: waiting for input or output to copy stored block */ 37 TABLE, /* i: waiting for dynamic block table lengths */ 38 LENLENS, /* i: waiting for code length 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 */ 41 DIST, /* i: waiting for distance code */ 42 DISTEXT, /* i: waiting for distance extra bits */ 43 MATCH, /* o: waiting for output space to copy string */ 44 LIT, /* o: waiting for output space to write literal */ 45 CHECK, /* i: waiting for 32-bit check value */ 46 LENGTH, /* i: waiting for 32-bit length (gzip) */ 47 DONE, /* finished check, done -- remain here until reset */ 48 BAD, /* got a data error -- remain here until reset */ 49 MEM, /* got an inflate() memory error -- remain here until reset */ 50 SYNC /* looking for synchronization bytes to restart inflate() */ 51} inflate_mode; 52 53/* 54 State transitions between above modes - 55 | 42 LENEXT, /* i: waiting for length extra bits */ 43 DIST, /* i: waiting for distance code */ 44 DISTEXT, /* i: waiting for distance extra bits */ 45 MATCH, /* o: waiting for output space to copy string */ 46 LIT, /* o: waiting for output space to write literal */ 47 CHECK, /* i: waiting for 32-bit check value */ 48 LENGTH, /* i: waiting for 32-bit length (gzip) */ 49 DONE, /* finished check, done -- remain here until reset */ 50 BAD, /* got a data error -- remain here until reset */ 51 MEM, /* got an inflate() memory error -- remain here until reset */ 52 SYNC /* looking for synchronization bytes to restart inflate() */ 53} inflate_mode; 54 55/* 56 State transitions between above modes - 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 58 Process header: | 59 60 Process header: |
59 HEAD -> (gzip) or (zlib) 60 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME 61 NAME -> COMMENT -> HCRC -> TYPE | 61 HEAD -> (gzip) or (zlib) or (raw) 62 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT -> 63 HCRC -> TYPE |
62 (zlib) -> DICTID or TYPE 63 DICTID -> DICT -> TYPE | 64 (zlib) -> DICTID or TYPE 65 DICTID -> DICT -> TYPE |
66 (raw) -> TYPEDO |
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64 Read deflate blocks: | 67 Read deflate blocks: |
65 TYPE -> STORED or TABLE or LEN or CHECK 66 STORED -> COPY -> TYPE 67 TABLE -> LENLENS -> CODELENS -> LEN 68 Read deflate codes: | 68 TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK 69 STORED -> COPY_ -> COPY -> TYPE 70 TABLE -> LENLENS -> CODELENS -> LEN_ 71 LEN_ -> LEN 72 Read deflate codes in fixed or dynamic block: |
69 LEN -> LENEXT or LIT or TYPE 70 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN 71 LIT -> LEN 72 Process trailer: 73 CHECK -> LENGTH -> DONE 74 */ 75 | 73 LEN -> LENEXT or LIT or TYPE 74 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN 75 LIT -> LEN 76 Process trailer: 77 CHECK -> LENGTH -> DONE 78 */ 79 |
76/* state maintained between inflate() calls. Approximately 7K bytes. */ | 80/* state maintained between inflate() calls. Approximately 10K bytes. */ |
77struct inflate_state { 78 inflate_mode mode; /* current inflate mode */ 79 int last; /* true if processing last block */ 80 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */ 81 int havedict; /* true if dictionary provided */ 82 int flags; /* gzip header method and flags (0 if zlib) */ 83 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */ 84 unsigned long check; /* protected copy of check value */ 85 unsigned long total; /* protected copy of output count */ 86 gz_headerp head; /* where to save gzip header information */ 87 /* sliding window */ 88 unsigned wbits; /* log base 2 of requested window size */ 89 unsigned wsize; /* window size or zero if not using window */ 90 unsigned whave; /* valid bytes in the window */ | 81struct inflate_state { 82 inflate_mode mode; /* current inflate mode */ 83 int last; /* true if processing last block */ 84 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */ 85 int havedict; /* true if dictionary provided */ 86 int flags; /* gzip header method and flags (0 if zlib) */ 87 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */ 88 unsigned long check; /* protected copy of check value */ 89 unsigned long total; /* protected copy of output count */ 90 gz_headerp head; /* where to save gzip header information */ 91 /* sliding window */ 92 unsigned wbits; /* log base 2 of requested window size */ 93 unsigned wsize; /* window size or zero if not using 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 */ 93 /* bit accumulator */ 94 unsigned long hold; /* input bit accumulator */ 95 unsigned bits; /* number of bits in "in" */ 96 /* for string and stored block copying */ 97 unsigned length; /* literal or length of data to copy */ 98 unsigned offset; /* distance back to copy string from */ 99 /* for table and code decoding */ --- 7 unchanged lines hidden (view full) --- 107 unsigned ncode; /* number of code length code lengths */ 108 unsigned nlen; /* number of length code lengths */ 109 unsigned ndist; /* number of distance code lengths */ 110 unsigned have; /* number of code lengths in lens[] */ 111 code FAR *next; /* next available space in codes[] */ 112 unsigned short lens[320]; /* temporary storage for code lengths */ 113 unsigned short work[288]; /* work area for code table building */ 114 code codes[ENOUGH]; /* space for code tables */ | 96 unsigned char FAR *window; /* allocated sliding window, if needed */ 97 /* bit accumulator */ 98 unsigned long hold; /* input bit accumulator */ 99 unsigned bits; /* number of bits in "in" */ 100 /* for string and stored block copying */ 101 unsigned length; /* literal or length of data to copy */ 102 unsigned offset; /* distance back to copy string from */ 103 /* for table and code decoding */ --- 7 unchanged lines hidden (view full) --- 111 unsigned ncode; /* number of code length code lengths */ 112 unsigned nlen; /* number of length code lengths */ 113 unsigned ndist; /* number of distance code lengths */ 114 unsigned have; /* number of code lengths in lens[] */ 115 code FAR *next; /* next available space in codes[] */ 116 unsigned short lens[320]; /* temporary storage for code lengths */ 117 unsigned short work[288]; /* work area for code table building */ 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 */ |
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115}; | 122}; |