common/dist/zlib/contrib/infback9/inflate9.h

   1 /*      $NetBSD: inflate9.h,v 1.1.1.1 2006/01/14 20:10:51 christos Exp $        */
   2
   3 /* inflate9.h -- internal inflate state definition
   4  * Copyright (C) 1995-2003 Mark Adler
   5  * For conditions of distribution and use, see copyright notice in zlib.h
   6  */
   7
   8 /* WARNING: this file should *not* be used by applications. It is
   9    part of the implementation of the compression library and is
  10    subject to change. Applications should only use zlib.h.
  11  */
  12
  13 /* Possible inflate modes between inflate() calls */
  14 typedef enum {
  15         TYPE,       /* i: waiting for type bits, including last-flag bit */
  16         STORED,     /* i: waiting for stored size (length and complement) */
  17         TABLE,      /* i: waiting for dynamic block table lengths */
  18             LEN,        /* i: waiting for length/lit code */
  19     DONE,       /* finished check, done -- remain here until reset */
  20     BAD         /* got a data error -- remain here until reset */
  21 } inflate_mode;
  22
  23 /*
  24     State transitions between above modes -
  25
  26     (most modes can go to the BAD mode -- not shown for clarity)
  27
  28     Read deflate blocks:
  29             TYPE -> STORED or TABLE or LEN or DONE
  30             STORED -> TYPE
  31             TABLE -> LENLENS -> CODELENS -> LEN
  32     Read deflate codes:
  33                 LEN -> LEN or TYPE
  34  */
  35
  36 /* state maintained between inflate() calls.  Approximately 7K bytes. */
  37 struct inflate_state {
  38         /* sliding window */
  39     unsigned char FAR *window;  /* allocated sliding window, if needed */
  40         /* dynamic table building */
  41     unsigned ncode;             /* number of code length code lengths */
  42     unsigned nlen;              /* number of length code lengths */
  43     unsigned ndist;             /* number of distance code lengths */
  44     unsigned have;              /* number of code lengths in lens[] */
  45     code FAR *next;             /* next available space in codes[] */
  46     unsigned short lens[320];   /* temporary storage for code lengths */
  47     unsigned short work[288];   /* work area for code table building */
  48     code codes[ENOUGH];         /* space for code tables */
  49 };