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comparison fluid-mnf/lz.h @ 311:9cecc930d78f

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fluid-mnf: original source from TI, defenestrated line endings and rearranged directory structure, but no *.[ch] source file content changes yet
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 29 Feb 2020 05:36:07 +0000
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310:ae39d76d5b7a 311:9cecc930d78f
1 /******************************************************************************
2 * FLUID (Flash Loader Utility Independent of Device)
3 *
4 * Simple LZ77 compressor (c) Texas Instruments, Jesper Pedersem TI-DK
5 *
6 * $Id: lz.h 1.4 Thu, 31 Oct 2002 13:12:27 +0100 tsj $
7 *
8 ******************************************************************************/
9
10 #ifndef _LZ_H_
11 #define _LZ_H_ 1
12
13 // Algorithmn efficiency constants
14
15 // Don't compress unless we have a > THRESHOLD match
16 #define THRESHOLD 2
17
18 // Number of bits to use for position, when storing a match
19 #define POS_BITS 12
20 #define POS_MASK 0x0FFF
21
22 // Number of bits to use for length, when storing a match
23 #define LEN_BITS 4
24 #define LEN_MASK 0xF000
25
26 // Size and size-mask of sliding window
27 #define WINDOW_SIZE (1 << POS_BITS)
28 #define WINDOW_MASK (WINDOW_SIZE - 1)
29
30 // Maximum match length
31 #define MAX_MATCH ((1 << LEN_BITS) + THRESHOLD)
32
33 // This structure is only being used by lzdecode/decompress().
34 struct lz_s {
35 uint8 window[WINDOW_SIZE]; // Sliding window buffer
36 int16 window_pos; // Current window position
37
38 // Static variables for get_bits()
39 uint32 bitbuf; // buffer for remaining bits
40 uint8 bitbuf_size; // number of bits in buffer
41
42 // Global input/output buffer pointers and sizes
43 uint8 *buffer_in;
44 uint32 buffer_in_size;
45 uint32 total_in_size;
46 uint8 *buffer_out;
47 uint32 buffer_out_size;
48 uint32 total_out_size;
49 };
50
51
52 void compress_init(void);
53 int compress(char *outbuf, char *inbuf, int size);
54
55 void decompress_init(struct lz_s *plz);
56 int decompress(struct lz_s *plz,
57 unsigned char *outbuf, unsigned char *inbuf, int size);
58
59 #endif