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Source at commit 1079 created 13 years 1 month ago. By meklort, began implimenting Bios disk changes. Code taken from biosfn.c | |
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1 | /* inflate.h -- internal inflate state definition␊ |
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 | ␊ |
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: same as COPY below, but only first time in */␊ |
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 */␊ |
40 | LEN_, /* i: same as LEN below, but only first time in */␊ |
41 | LEN, /* i: waiting for length/lit/eob code */␊ |
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 | ␊ |
58 | (most modes can go to BAD or MEM on error -- not shown for clarity)␊ |
59 | ␊ |
60 | Process header:␊ |
61 | HEAD -> (gzip) or (zlib) or (raw)␊ |
62 | (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->␊ |
63 | HCRC -> TYPE␊ |
64 | (zlib) -> DICTID or TYPE␊ |
65 | DICTID -> DICT -> TYPE␊ |
66 | (raw) -> TYPEDO␊ |
67 | Read deflate blocks:␊ |
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:␊ |
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 | ␊ |
80 | /* state maintained between inflate() calls. Approximately 10K bytes. */␊ |
81 | struct 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 */␊ |
95 | unsigned wnext; /* window write index */␊ |
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 */␊ |
104 | unsigned extra; /* extra bits needed */␊ |
105 | /* fixed and dynamic code tables */␊ |
106 | code const FAR *lencode; /* starting table for length/literal codes */␊ |
107 | code const FAR *distcode; /* starting table for distance codes */␊ |
108 | unsigned lenbits; /* index bits for lencode */␊ |
109 | unsigned distbits; /* index bits for distcode */␊ |
110 | /* dynamic table building */␊ |
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 */␊ |
122 | };␊ |
123 |