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