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1 | /* inflate9.h -- internal inflate state definition |
2 | * Copyright (C) 1995-2003 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 | /* Possible inflate modes between inflate() calls */ | |
12 | typedef enum { | |
13 | TYPE, /* i: waiting for type bits, including last-flag bit */ | |
14 | STORED, /* i: waiting for stored size (length and complement) */ | |
15 | TABLE, /* i: waiting for dynamic block table lengths */ | |
16 | LEN, /* i: waiting for length/lit code */ | |
17 | DONE, /* finished check, done -- remain here until reset */ | |
18 | BAD /* got a data error -- remain here until reset */ | |
19 | } inflate_mode; | |
20 | ||
21 | /* | |
22 | State transitions between above modes - | |
23 | ||
24 | (most modes can go to the BAD mode -- not shown for clarity) | |
25 | ||
26 | Read deflate blocks: | |
27 | TYPE -> STORED or TABLE or LEN or DONE | |
28 | STORED -> TYPE | |
29 | TABLE -> LENLENS -> CODELENS -> LEN | |
30 | Read deflate codes: | |
31 | LEN -> LEN or TYPE | |
32 | */ | |
33 | ||
34 | /* state maintained between inflate() calls. Approximately 7K bytes. */ | |
35 | struct inflate_state { | |
36 | /* sliding window */ | |
37 | unsigned char FAR *window; /* allocated sliding window, if needed */ | |
38 | /* dynamic table building */ | |
39 | unsigned ncode; /* number of code length code lengths */ | |
40 | unsigned nlen; /* number of length code lengths */ | |
41 | unsigned ndist; /* number of distance code lengths */ | |
42 | unsigned have; /* number of code lengths in lens[] */ | |
43 | code FAR *next; /* next available space in codes[] */ | |
44 | unsigned short lens[320]; /* temporary storage for code lengths */ | |
45 | unsigned short work[288]; /* work area for code table building */ | |
46 | code codes[ENOUGH]; /* space for code tables */ | |
47 | }; |