Mercurial > hg > CbC > CbC_gcc
comparison zlib/inflate.h @ 51:ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 07 Feb 2010 18:27:48 +0900 |
parents | |
children | 04ced10e8804 |
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47:3bfb6c00c1e0 | 51:ae3a4bfb450b |
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1 /* inflate.h -- internal inflate state definition | |
2 * Copyright (C) 1995-2004 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 | |
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 | |
13 the crc code when it is not needed. For shared libraries, gzip decoding | |
14 should be left enabled. */ | |
15 #ifndef NO_GZIP | |
16 # define GUNZIP | |
17 #endif | |
18 | |
19 /* Possible inflate modes between inflate() calls */ | |
20 typedef enum { | |
21 HEAD, /* i: waiting for magic header */ | |
22 FLAGS, /* i: waiting for method and flags (gzip) */ | |
23 TIME, /* i: waiting for modification time (gzip) */ | |
24 OS, /* i: waiting for extra flags and operating system (gzip) */ | |
25 EXLEN, /* i: waiting for extra length (gzip) */ | |
26 EXTRA, /* i: waiting for extra bytes (gzip) */ | |
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: 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 */ | |
39 LEN, /* i: waiting for length/lit 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 | |
56 (most modes can go to the BAD or MEM mode -- not shown for clarity) | |
57 | |
58 Process header: | |
59 HEAD -> (gzip) or (zlib) | |
60 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME | |
61 NAME -> COMMENT -> HCRC -> TYPE | |
62 (zlib) -> DICTID or TYPE | |
63 DICTID -> DICT -> TYPE | |
64 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: | |
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 | |
76 /* state maintained between inflate() calls. Approximately 7K bytes. */ | |
77 struct 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 */ | |
91 unsigned write; /* 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 */ | |
100 unsigned extra; /* extra bits needed */ | |
101 /* fixed and dynamic code tables */ | |
102 code const FAR *lencode; /* starting table for length/literal codes */ | |
103 code const FAR *distcode; /* starting table for distance codes */ | |
104 unsigned lenbits; /* index bits for lencode */ | |
105 unsigned distbits; /* index bits for distcode */ | |
106 /* dynamic table building */ | |
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 */ | |
115 }; |