include/jffs2/mini_inflate.h

   1 /*-------------------------------------------------------------------------
   2  * Filename:      mini_inflate.h
   3  * Version:       $Id: mini_inflate.h,v 1.2 2002/01/17 00:53:20 nyet Exp $
   4  * Copyright:     Copyright (C) 2001, Russ Dill
   5  * Author:        Russ Dill <Russ.Dill@asu.edu>
   6  * Description:   Mini deflate implementation
   7  *-----------------------------------------------------------------------*/
   8 /*
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 typedef __SIZE_TYPE__ size;
  13
  14 #define NO_ERROR 0
  15 #define COMP_UNKNOWN 1   /* The specififed bytype is invalid */
  16 #define CODE_NOT_FOUND 2 /* a huffman code in the stream could not be decoded */
  17 #define TOO_MANY_BITS 3  /* pull_bits was passed an argument that is too
  18                           * large */
  19
  20 /* This struct represents an entire huffman code set. It has various lookup
  21  * tables to speed decoding */
  22 struct huffman_set {
  23         int bits;        /* maximum bit length */
  24         int num_symbols; /* Number of symbols this code can represent */
  25         int *lengths;    /* The bit length of symbols */
  26         int *symbols;    /* All of the symbols, sorted by the huffman code */
  27         int *count;      /* the number of codes of this bit length */
  28         int *first;      /* the first code of this bit length */
  29         int *pos;        /* the symbol that first represents (in the symbols
  30                           * array) */
  31 };
  32
  33 struct bitstream {
  34         unsigned char *data; /* increments as we move from byte to byte */
  35         unsigned char bit;   /* 0 to 7 */
  36         void *(*memcpy)(void *, const void *, size);
  37         unsigned long decoded; /* The number of bytes decoded */
  38         int error;
  39
  40         int  distance_count[16];
  41         int  distance_first[16];
  42         int  distance_pos[16];
  43         int  distance_lengths[32];
  44         int  distance_symbols[32];
  45
  46         int  code_count[8];
  47         int  code_first[8];
  48         int  code_pos[8];
  49         int  code_lengths[19];
  50         int  code_symbols[19];
  51
  52         int  length_count[16];
  53         int  length_first[16];
  54         int  length_pos[16];
  55         int  length_lengths[288];
  56         int  length_symbols[288];
  57
  58         struct huffman_set codes;
  59         struct huffman_set lengths;
  60         struct huffman_set distance;
  61 };
  62
  63 #define NO_COMP 0
  64 #define FIXED_COMP 1
  65 #define DYNAMIC_COMP 2
  66
  67 long decompress_block(unsigned char *dest, unsigned char *source,
  68                       void *(*inflate_memcpy)(void *dest, const void *src, size n));