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 };
48