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 */
12typedef 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. */
35struct 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};
48