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 10typedef __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 */ 20struct 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 31struct 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 65long decompress_block(unsigned char *dest, unsigned char *source, 66 void *(*inflate_memcpy)(void *dest, const void *src, size n)); 67