1 #ifndef INFLATE_H 1
2 #define INFLATE_H
3
4 /* inflate.h -- internal inflate state definit
5 * Copyright (C) 1995-2004 Mark Adler
6 * For conditions of distribution and use, see
7 */
8
9 /* WARNING: this file should *not* be used by
10 part of the implementation of the compressi
11 subject to change. Applications should only
12 */
13
14 #include "inftrees.h"
15
16 /* Possible inflate modes between inflate() ca
17 typedef enum {
18 HEAD, /* i: waiting for magic header
19 FLAGS, /* i: waiting for method and f
20 TIME, /* i: waiting for modification
21 OS, /* i: waiting for extra flags
22 EXLEN, /* i: waiting for extra length
23 EXTRA, /* i: waiting for extra bytes
24 NAME, /* i: waiting for end of file
25 COMMENT, /* i: waiting for end of comme
26 HCRC, /* i: waiting for header crc (
27 DICTID, /* i: waiting for dictionary c
28 DICT, /* waiting for inflateSetDicti
29 TYPE, /* i: waiting for type bit
30 TYPEDO, /* i: same, but skip check
31 STORED, /* i: waiting for stored s
32 COPY, /* i/o: waiting for input
33 TABLE, /* i: waiting for dynamic
34 LENLENS, /* i: waiting for code len
35 CODELENS, /* i: waiting for length/l
36 LEN, /* i: waiting for leng
37 LENEXT, /* i: waiting for leng
38 DIST, /* i: waiting for dist
39 DISTEXT, /* i: waiting for dist
40 MATCH, /* o: waiting for outp
41 LIT, /* o: waiting for outp
42 CHECK, /* i: waiting for 32-bit check
43 LENGTH, /* i: waiting for 32-bit lengt
44 DONE, /* finished check, done -- rem
45 BAD, /* got a data error -- remain
46 MEM, /* got an inflate() memory err
47 SYNC /* looking for synchronization
48 } inflate_mode;
49
50 /*
51 State transitions between above modes -
52
53 (most modes can go to the BAD or MEM mode
54
55 Process header:
56 HEAD -> (gzip) or (zlib)
57 (gzip) -> FLAGS -> TIME -> OS -> EXLEN
58 NAME -> COMMENT -> HCRC -> TYPE
59 (zlib) -> DICTID or TYPE
60 DICTID -> DICT -> TYPE
61 Read deflate blocks:
62 TYPE -> STORED or TABLE or LEN or
63 STORED -> COPY -> TYPE
64 TABLE -> LENLENS -> CODELENS -> LE
65 Read deflate codes:
66 LEN -> LENEXT or LIT or TYPE
67 LENEXT -> DIST -> DISTEXT -> M
68 LIT -> LEN
69 Process trailer:
70 CHECK -> LENGTH -> DONE
71 */
72
73 /* state maintained between inflate() calls.
74 struct inflate_state {
75 inflate_mode mode; /* current inf
76 int last; /* true if pro
77 int wrap; /* bit 0 true
78 int havedict; /* true if dic
79 int flags; /* gzip header
80 unsigned dmax; /* zlib header
81 unsigned long check; /* protected c
82 unsigned long total; /* protected c
83 /* gz_headerp head; */ /* where t
84 /* sliding window */
85 unsigned wbits; /* log base 2
86 unsigned wsize; /* window size
87 unsigned whave; /* valid bytes
88 unsigned write; /* window writ
89 unsigned char *window; /* allocated slidi
90 /* bit accumulator */
91 unsigned long hold; /* input bit a
92 unsigned bits; /* number of b
93 /* for string and stored block copying
94 unsigned length; /* literal or
95 unsigned offset; /* distance ba
96 /* for table and code decoding */
97 unsigned extra; /* extra bits
98 /* fixed and dynamic code tables */
99 code const *lencode; /* starting table
100 code const *distcode; /* starting table
101 unsigned lenbits; /* index bits
102 unsigned distbits; /* index bits
103 /* dynamic table building */
104 unsigned ncode; /* number of c
105 unsigned nlen; /* number of l
106 unsigned ndist; /* number of d
107 unsigned have; /* number of c
108 code *next; /* next available
109 unsigned short lens[320]; /* temporary s
110 unsigned short work[288]; /* work area f
111 code codes[ENOUGH]; /* space for c
112 };
113
114 /* Reverse the bytes in a 32-bit value */
115 #define REVERSE(q) \
116 ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff
117 (((q) & 0xff00) << 8) + (((q) & 0xff) <<
118
119 #endif
120
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