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inflate.h
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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#ifndef _INFLATE_H_
12#define _INFLATE_H_
13
14/* define NO_GZIP when compiling if you want to disable gzip header and
15 trailer decoding by inflate(). NO_GZIP would be used to avoid linking in
16 the crc code when it is not needed. For shared libraries, gzip decoding
17 should be left enabled. */
18#ifndef NO_GZIP
19# define GUNZIP
20#endif
21
22/* Possible inflate modes between inflate() calls */
23typedef enum {
24 HEAD, /* i: waiting for magic header */
25 FLAGS, /* i: waiting for method and flags (gzip) */
26 TIME, /* i: waiting for modification time (gzip) */
27 OS, /* i: waiting for extra flags and operating system (gzip) */
28 EXLEN, /* i: waiting for extra length (gzip) */
29 EXTRA, /* i: waiting for extra bytes (gzip) */
30 NAME, /* i: waiting for end of file name (gzip) */
31 COMMENT, /* i: waiting for end of comment (gzip) */
32 HCRC, /* i: waiting for header crc (gzip) */
33 DICTID, /* i: waiting for dictionary check value */
34 DICT, /* waiting for inflateSetDictionary() call */
35 TYPE, /* i: waiting for type bits, including last-flag bit */
36 TYPEDO, /* i: same, but skip check to exit inflate on new block */
37 STORED, /* i: waiting for stored size (length and complement) */
38 COPY, /* i/o: waiting for input or output to copy stored block */
39 TABLE, /* i: waiting for dynamic block table lengths */
40 LENLENS, /* i: waiting for code length code lengths */
41 CODELENS, /* i: waiting for length/lit and distance code lengths */
42 LEN, /* i: waiting for length/lit code */
43 LENEXT, /* i: waiting for length extra bits */
44 DIST, /* i: waiting for distance code */
45 DISTEXT, /* i: waiting for distance extra bits */
46 MATCH, /* o: waiting for output space to copy string */
47 LIT, /* o: waiting for output space to write literal */
48 CHECK, /* i: waiting for 32-bit check value */
49 LENGTH, /* i: waiting for 32-bit length (gzip) */
50 DONE, /* finished check, done -- remain here until reset */
51 BAD, /* got a data error -- remain here until reset */
52 MEM, /* got an inflate() memory error -- remain here until reset */
53 SYNC /* looking for synchronization bytes to restart inflate() */
55
56/*
57 State transitions between above modes -
58
59 (most modes can go to the BAD or MEM mode -- not shown for clarity)
60
61 Process header:
62 HEAD -> (gzip) or (zlib)
63 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME
64 NAME -> COMMENT -> HCRC -> TYPE
65 (zlib) -> DICTID or TYPE
66 DICTID -> DICT -> TYPE
67 Read deflate blocks:
68 TYPE -> STORED or TABLE or LEN or CHECK
69 STORED -> COPY -> TYPE
70 TABLE -> LENLENS -> CODELENS -> LEN
71 Read deflate codes:
72 LEN -> LENEXT or LIT or TYPE
73 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
74 LIT -> LEN
75 Process trailer:
76 CHECK -> LENGTH -> DONE
77 */
78
79/* state maintained between inflate() calls. Approximately 7K bytes. */
81 inflate_mode mode; /* current inflate mode */
82 int last; /* true if processing last block */
83 int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
84 int havedict; /* true if dictionary provided */
85 int flags; /* gzip header method and flags (0 if zlib) */
86 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
87 unsigned long check; /* protected copy of check value */
88 unsigned long total; /* protected copy of output count */
89 gz_headerp head; /* where to save gzip header information */
90 /* sliding window */
91 unsigned wbits; /* log base 2 of requested window size */
92 unsigned wsize; /* window size or zero if not using window */
93 unsigned whave; /* valid bytes in the window */
94 unsigned write; /* window write index */
95 unsigned char FAR *window; /* allocated sliding window, if needed */
96 /* bit accumulator */
97 unsigned long hold; /* input bit accumulator */
98 unsigned bits; /* number of bits in "in" */
99 /* for string and stored block copying */
100 unsigned length; /* literal or length of data to copy */
101 unsigned offset; /* distance back to copy string from */
102 /* for table and code decoding */
103 unsigned extra; /* extra bits needed */
104 /* fixed and dynamic code tables */
105 code const FAR *lencode; /* starting table for length/literal codes */
106 code const FAR *distcode; /* starting table for distance codes */
107 unsigned lenbits; /* index bits for lencode */
108 unsigned distbits; /* index bits for distcode */
109 /* dynamic table building */
110 unsigned ncode; /* number of code length code lengths */
111 unsigned nlen; /* number of length code lengths */
112 unsigned ndist; /* number of distance code lengths */
113 unsigned have; /* number of code lengths in lens[] */
114 code FAR *next; /* next available space in codes[] */
115 unsigned short lens[320]; /* temporary storage for code lengths */
116 unsigned short work[288]; /* work area for code table building */
117 code codes[ENOUGH]; /* space for code tables */
118};
119
120
121#endif
#define TIME
Definition Ay_Cpu.cpp:88
#define COPY(x)
#define ENOUGH
Definition inftrees.h:46
inflate_mode
Definition inflate.h:23
@ HEAD
Definition inflate.h:24
@ MATCH
Definition inflate.h:46
@ DICT
Definition inflate.h:34
@ TABLE
Definition inflate.h:39
@ LENGTH
Definition inflate.h:49
@ FLAGS
Definition inflate.h:25
@ LIT
Definition inflate.h:47
@ SYNC
Definition inflate.h:53
@ OS
Definition inflate.h:27
@ EXLEN
Definition inflate.h:28
@ MEM
Definition inflate.h:52
@ NAME
Definition inflate.h:30
@ CODELENS
Definition inflate.h:41
@ DICTID
Definition inflate.h:33
@ DONE
Definition inflate.h:50
@ TYPEDO
Definition inflate.h:36
@ COMMENT
Definition inflate.h:31
@ LENLENS
Definition inflate.h:40
@ TYPE
Definition inflate.h:35
@ DIST
Definition inflate.h:44
@ LENEXT
Definition inflate.h:43
@ HCRC
Definition inflate.h:32
@ CHECK
Definition inflate.h:48
@ DISTEXT
Definition inflate.h:45
@ BAD
Definition inflate.h:51
@ LEN
Definition inflate.h:42
@ EXTRA
Definition inflate.h:29
Definition inftrees.h:27
Definition inflate.h:80
code const FAR * distcode
Definition inflate.h:106
int havedict
Definition inflate.h:84
unsigned lenbits
Definition inflate.h:107
unsigned ndist
Definition inflate.h:112
code const FAR * lencode
Definition inflate.h:105
unsigned nlen
Definition inflate.h:111
unsigned have
Definition inflate.h:113
unsigned length
Definition inflate.h:100
unsigned long hold
Definition inflate.h:97
unsigned extra
Definition inflate.h:103
unsigned ncode
Definition inflate.h:110
unsigned whave
Definition inflate.h:93
unsigned wbits
Definition inflate.h:91
unsigned short work[288]
Definition inflate.h:116
code FAR * next
Definition inflate.h:114
unsigned write
Definition inflate.h:94
unsigned distbits
Definition inflate.h:108
int wrap
Definition inflate.h:83
inflate_mode mode
Definition inflate.h:81
unsigned char FAR * window
Definition inflate.h:95
int flags
Definition inflate.h:85
unsigned short lens[320]
Definition inflate.h:115
gz_headerp head
Definition inflate.h:89
unsigned bits
Definition inflate.h:98
int last
Definition inflate.h:82
unsigned wsize
Definition inflate.h:92
unsigned dmax
Definition inflate.h:86
unsigned long check
Definition inflate.h:87
unsigned offset
Definition inflate.h:101
code codes[ENOUGH]
Definition inflate.h:117
unsigned long total
Definition inflate.h:88
#define STORED
Definition unzpriv.h:1690
#define FAR
Definition zconf.h:270
gz_header FAR * gz_headerp
Definition zlib.h:127