include/jffs2/mini_inflate.h

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