zlib/contrib/infback9/inflate9.h

   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 };