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annotate fluid-mnf/lz.h @ 348:37b5f94de802

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fluid-mnf: sensible target tty specification
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 13 Mar 2020 06:41:44 +0000
parents 9cecc930d78f
children
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311
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1 /******************************************************************************
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2 * FLUID (Flash Loader Utility Independent of Device)
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3 *
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4 * Simple LZ77 compressor (c) Texas Instruments, Jesper Pedersem TI-DK
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5 *
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6 * $Id: lz.h 1.4 Thu, 31 Oct 2002 13:12:27 +0100 tsj $
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7 *
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8 ******************************************************************************/
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9
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10 #ifndef _LZ_H_
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11 #define _LZ_H_ 1
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12
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13 // Algorithmn efficiency constants
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14
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15 // Don't compress unless we have a > THRESHOLD match
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16 #define THRESHOLD 2
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17
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18 // Number of bits to use for position, when storing a match
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19 #define POS_BITS 12
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20 #define POS_MASK 0x0FFF
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21
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22 // Number of bits to use for length, when storing a match
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23 #define LEN_BITS 4
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24 #define LEN_MASK 0xF000
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25
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26 // Size and size-mask of sliding window
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27 #define WINDOW_SIZE (1 << POS_BITS)
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28 #define WINDOW_MASK (WINDOW_SIZE - 1)
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29
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30 // Maximum match length
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31 #define MAX_MATCH ((1 << LEN_BITS) + THRESHOLD)
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32
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33 // This structure is only being used by lzdecode/decompress().
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34 struct lz_s {
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35 uint8 window[WINDOW_SIZE]; // Sliding window buffer
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36 int16 window_pos; // Current window position
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37
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38 // Static variables for get_bits()
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39 uint32 bitbuf; // buffer for remaining bits
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40 uint8 bitbuf_size; // number of bits in buffer
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41
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42 // Global input/output buffer pointers and sizes
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43 uint8 *buffer_in;
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44 uint32 buffer_in_size;
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45 uint32 total_in_size;
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46 uint8 *buffer_out;
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47 uint32 buffer_out_size;
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48 uint32 total_out_size;
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49 };
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50
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51
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52 void compress_init(void);
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53 int compress(char *outbuf, char *inbuf, int size);
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54
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55 void decompress_init(struct lz_s *plz);
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56 int decompress(struct lz_s *plz,
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57 unsigned char *outbuf, unsigned char *inbuf, int size);
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58
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59 #endif