1*5ba6b03cSchristos /* inflate9.h -- internal inflate state definition
2*5ba6b03cSchristos  * Copyright (C) 1995-2003 Mark Adler
3*5ba6b03cSchristos  * For conditions of distribution and use, see copyright notice in zlib.h
4*5ba6b03cSchristos  */
5*5ba6b03cSchristos 
6*5ba6b03cSchristos /* WARNING: this file should *not* be used by applications. It is
7*5ba6b03cSchristos    part of the implementation of the compression library and is
8*5ba6b03cSchristos    subject to change. Applications should only use zlib.h.
9*5ba6b03cSchristos  */
10*5ba6b03cSchristos 
11*5ba6b03cSchristos /* Possible inflate modes between inflate() calls */
12*5ba6b03cSchristos typedef enum {
13*5ba6b03cSchristos         TYPE,       /* i: waiting for type bits, including last-flag bit */
14*5ba6b03cSchristos         STORED,     /* i: waiting for stored size (length and complement) */
15*5ba6b03cSchristos         TABLE,      /* i: waiting for dynamic block table lengths */
16*5ba6b03cSchristos             LEN,        /* i: waiting for length/lit code */
17*5ba6b03cSchristos     DONE,       /* finished check, done -- remain here until reset */
18*5ba6b03cSchristos     BAD         /* got a data error -- remain here until reset */
19*5ba6b03cSchristos } inflate_mode;
20*5ba6b03cSchristos 
21*5ba6b03cSchristos /*
22*5ba6b03cSchristos     State transitions between above modes -
23*5ba6b03cSchristos 
24*5ba6b03cSchristos     (most modes can go to the BAD mode -- not shown for clarity)
25*5ba6b03cSchristos 
26*5ba6b03cSchristos     Read deflate blocks:
27*5ba6b03cSchristos             TYPE -> STORED or TABLE or LEN or DONE
28*5ba6b03cSchristos             STORED -> TYPE
29*5ba6b03cSchristos             TABLE -> LENLENS -> CODELENS -> LEN
30*5ba6b03cSchristos     Read deflate codes:
31*5ba6b03cSchristos                 LEN -> LEN or TYPE
32*5ba6b03cSchristos  */
33*5ba6b03cSchristos 
34*5ba6b03cSchristos /* state maintained between inflate() calls.  Approximately 7K bytes. */
35*5ba6b03cSchristos struct inflate_state {
36*5ba6b03cSchristos         /* sliding window */
37*5ba6b03cSchristos     unsigned char FAR *window;  /* allocated sliding window, if needed */
38*5ba6b03cSchristos         /* dynamic table building */
39*5ba6b03cSchristos     unsigned ncode;             /* number of code length code lengths */
40*5ba6b03cSchristos     unsigned nlen;              /* number of length code lengths */
41*5ba6b03cSchristos     unsigned ndist;             /* number of distance code lengths */
42*5ba6b03cSchristos     unsigned have;              /* number of code lengths in lens[] */
43*5ba6b03cSchristos     code FAR *next;             /* next available space in codes[] */
44*5ba6b03cSchristos     unsigned short lens[320];   /* temporary storage for code lengths */
45*5ba6b03cSchristos     unsigned short work[288];   /* work area for code table building */
46*5ba6b03cSchristos     code codes[ENOUGH];         /* space for code tables */
47*5ba6b03cSchristos };
48