sdk-world v2026.11.05
PS2 SDK - world tier (copyleft-allowed, non-essential packages)
Loading...
Searching...
No Matches
inflate.h
Go to the documentation of this file.
1/* inflate.h -- internal inflate state definition
2 * Copyright (C) 1995-2019 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. */
19#ifndef NO_GZIP
20# define GUNZIP
21#endif
22
23/* Possible inflate modes between inflate() calls */
24typedef enum {
25 HEAD = 16180, /* i: waiting for magic header */
26 FLAGS, /* i: waiting for method and flags (gzip) */
27 TIME, /* i: waiting for modification time (gzip) */
28 OS, /* i: waiting for extra flags and operating system (gzip) */
29 EXLEN, /* i: waiting for extra length (gzip) */
30 EXTRA, /* i: waiting for extra bytes (gzip) */
31 NAME, /* i: waiting for end of file name (gzip) */
32 COMMENT, /* i: waiting for end of comment (gzip) */
33 HCRC, /* i: waiting for header crc (gzip) */
34 DICTID, /* i: waiting for dictionary check value */
35 DICT, /* waiting for inflateSetDictionary() call */
36 TYPE, /* i: waiting for type bits, including last-flag bit */
37 TYPEDO, /* i: same, but skip check to exit inflate on new block */
38 STORED, /* i: waiting for stored size (length and complement) */
39 COPY_, /* i/o: same as COPY below, but only first time in */
40 COPY, /* i/o: waiting for input or output to copy stored block */
41 TABLE, /* i: waiting for dynamic block table lengths */
42 LENLENS, /* i: waiting for code length code lengths */
43 CODELENS, /* i: waiting for length/lit and distance code lengths */
44 LEN_, /* i: same as LEN below, but only first time in */
45 LEN, /* i: waiting for length/lit/eob code */
46 LENEXT, /* i: waiting for length extra bits */
47 DIST, /* i: waiting for distance code */
48 DISTEXT, /* i: waiting for distance extra bits */
49 MATCH, /* o: waiting for output space to copy string */
50 LIT, /* o: waiting for output space to write literal */
51 CHECK, /* i: waiting for 32-bit check value */
52 LENGTH, /* i: waiting for 32-bit length (gzip) */
53 DONE, /* finished check, done -- remain here until reset */
54 BAD, /* got a data error -- remain here until reset */
55 MEM, /* got an inflate() memory error -- remain here until reset */
56 SYNC /* looking for synchronization bytes to restart inflate() */
57} inflate_mode;
58
59/*
60 State transitions between above modes -
61
62 (most modes can go to BAD or MEM on error -- not shown for clarity)
63
64 Process header:
65 HEAD -> (gzip) or (zlib) or (raw)
66 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
67 HCRC -> TYPE
68 (zlib) -> DICTID or TYPE
69 DICTID -> DICT -> TYPE
70 (raw) -> TYPEDO
71 Read deflate blocks:
72 TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
73 STORED -> COPY_ -> COPY -> TYPE
74 TABLE -> LENLENS -> CODELENS -> LEN_
75 LEN_ -> LEN
76 Read deflate codes in fixed or dynamic block:
77 LEN -> LENEXT or LIT or TYPE
78 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
79 LIT -> LEN
80 Process trailer:
81 CHECK -> LENGTH -> DONE
82 */
83
84/* State maintained between inflate() calls -- approximately 7K bytes, not
85 including the allocated sliding window, which is up to 32K bytes. */
86struct inflate_state {
87 z_streamp strm; /* pointer back to this zlib stream */
88 inflate_mode mode; /* current inflate mode */
89 int last; /* true if processing last block */
90 int wrap; /* bit 0 true for zlib, bit 1 true for gzip,
91 bit 2 true to validate check value */
92 int havedict; /* true if dictionary provided */
93 int flags; /* gzip header method and flags, 0 if zlib, or
94 -1 if raw or no header yet */
95 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
96 unsigned long check; /* protected copy of check value */
97 unsigned long total; /* protected copy of output count */
98 gz_headerp head; /* where to save gzip header information */
99 /* sliding window */
100 unsigned wbits; /* log base 2 of requested window size */
101 unsigned wsize; /* window size or zero if not using window */
102 unsigned whave; /* valid bytes in the window */
103 unsigned wnext; /* window write index */
104 unsigned char FAR *window; /* allocated sliding window, if needed */
105 /* bit accumulator */
106 unsigned long hold; /* input bit accumulator */
107 unsigned bits; /* number of bits in "in" */
108 /* for string and stored block copying */
109 unsigned length; /* literal or length of data to copy */
110 unsigned offset; /* distance back to copy string from */
111 /* for table and code decoding */
112 unsigned extra; /* extra bits needed */
113 /* fixed and dynamic code tables */
114 code const FAR *lencode; /* starting table for length/literal codes */
115 code const FAR *distcode; /* starting table for distance codes */
116 unsigned lenbits; /* index bits for lencode */
117 unsigned distbits; /* index bits for distcode */
118 /* dynamic table building */
119 unsigned ncode; /* number of code length code lengths */
120 unsigned nlen; /* number of length code lengths */
121 unsigned ndist; /* number of distance code lengths */
122 unsigned have; /* number of code lengths in lens[] */
123 code FAR *next; /* next available space in codes[] */
124 unsigned short lens[320]; /* temporary storage for code lengths */
125 unsigned short work[288]; /* work area for code table building */
126 code codes[ENOUGH]; /* space for code tables */
127 int sane; /* if false, allow invalid distance too far */
128 int back; /* bits back of last unprocessed length/lit */
129 unsigned was; /* initial length of match */
130};
inflate_state
Definition inflate.h:89