FreeCalypso > hg > freecalypso-reveng
annotate fluid-mnf/lzdecode.c @ 391:a40557e5b35f
compal/melody-extr: wrote table extractor
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 01 Apr 2022 05:04:23 +0000 |
parents | 9cecc930d78f |
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rev | line source |
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1 /******************************************************************************* |
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2 * |
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3 * Simple LZ77 compressor (c) Texas Instruments, Jesper Pedersem TI-DK |
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4 * |
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5 * File format: |
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6 * --------------------------------------------------- |
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7 * | Tag | Data | Tag | Data | Tag | Data etc... |
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8 * --------------------------------------------------- |
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9 * |
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10 * Where TAG is 1 bit indicating how to interpret the following data |
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11 * (0 = uncompressed, 1 = compressed) |
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12 * |
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13 * Depending on TAG the Data is: |
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14 * 0 : One uncompressed char of raw data |
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15 * 1 : A length of and a pointer to a match in the previous data |
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16 * |
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17 * ---------------------------------------- |
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18 * Length + pointer = | Length (3 bits) | Position (12 bits) | |
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19 * ---------------------------------------- |
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20 * MSB LSB MSB LSB |
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21 * |
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22 * Compression threshold is 1 i.e. add 1 to Length to get the actual Length. |
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23 * |
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24 * It has been found that 5+14 bits is the most optimum for our kind of |
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25 * data, but we use only 3+12 bits for improoved speed. Compression is |
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26 * almost as good because we can set the threshold at 1 instead of 2 (2 char |
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27 * matches can be compressed to 12+3 bits) |
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28 * |
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29 * With a 12 bit position we can use 4K for the sliding window. Position |
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30 * indicates where the match exists as an absolute address into the |
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31 * window. This way we have a very simple "pseudo sliding window" which |
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32 * automatically enables RLE (Run Length Encoding). |
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33 * |
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34 * The code performs a "lazy" string search i.e. a match will be dropped if |
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35 * it prevents an even greater match for the very next string. This yeild |
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36 * slightly better compression (approx. 1%) at minor cost of compression |
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37 * speed - decompression time is the same! A second order lazy match could |
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38 * be implemented, but it gives an insignificant improovement of about 0.1% |
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39 * when compressing executeables |
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40 * |
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41 ******************************************************************************/ |
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42 |
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43 #if (TARGET == 0) |
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44 #include "fluid.h" |
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45 #include <stdlib.h> |
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46 #endif |
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47 |
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48 #include "lz.h" |
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49 |
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50 |
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51 /****************************************************************************** |
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52 * Globals |
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53 ******************************************************************************/ |
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54 |
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55 |
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56 /****************************************************************************** |
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57 * getchar/putchar |
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58 ******************************************************************************/ |
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59 |
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60 #define EOF -1 |
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61 |
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62 #define LZ_PUTCHAR(data) \ |
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63 *plz->buffer_out++ = data; \ |
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64 plz->buffer_out_size++; |
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65 |
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66 |
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67 |
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68 /****************************************************************************** |
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69 * Code |
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70 ******************************************************************************/ |
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71 uint8 get_byte(struct lz_s *plz) |
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72 { |
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73 plz->buffer_in_size--; |
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74 return(*plz->buffer_in++); |
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75 } |
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76 |
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77 uint16 get_word(struct lz_s *plz) |
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78 { |
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79 uint16 tmp; |
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80 |
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81 tmp = (*plz->buffer_in++) << 8; |
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82 tmp |= (*plz->buffer_in++); |
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83 plz->buffer_in_size -= 2; |
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84 return(tmp); |
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85 } |
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86 |
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87 |
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88 void decompress_init(struct lz_s *plz) |
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89 { |
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90 plz->window_pos = 0; |
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91 plz->bitbuf = 0; |
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92 plz->bitbuf_size = 0; |
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93 } |
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94 |
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95 int decompress(struct lz_s *plz, |
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96 unsigned char *outbuf, unsigned char *inbuf, int size) |
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97 { |
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98 int16 match_pos; |
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99 int16 match_len, i; |
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100 int8 ch; |
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101 uint8 tag_byte; |
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102 uint8 tag_pos; |
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103 uint16 tmp; |
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104 |
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105 |
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106 plz->buffer_out = outbuf; |
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107 plz->buffer_out_size = 0; |
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108 plz->buffer_in = inbuf; |
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109 plz->buffer_in_size = size; |
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110 |
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111 while(plz->buffer_in_size > 0) |
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112 { |
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113 tag_byte = get_byte(plz); |
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114 |
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115 for(tag_pos = 0x80; (plz->buffer_in_size > 0) && (tag_pos > 0x00); tag_pos >>= 0x01) |
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116 { |
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117 if(tag_byte & tag_pos) // Compressed? |
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118 { |
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119 tmp = get_word(plz); |
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120 match_len = (tmp >> POS_BITS) + THRESHOLD + 1; |
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121 match_pos = (tmp & POS_MASK); |
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122 for (i = 0; i < match_len; i++) |
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123 { |
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124 plz->window[plz->window_pos] = plz->window[WINDOW_MASK & (match_pos + i)]; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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125 LZ_PUTCHAR(plz->window[plz->window_pos]); |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
126 plz->window_pos++; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
127 plz->window_pos &= WINDOW_MASK; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
128 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
129 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
130 else |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
131 { |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
132 ch = get_byte(plz); |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
133 plz->window[plz->window_pos] = ch; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
134 LZ_PUTCHAR(ch); |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
135 plz->window_pos++; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
136 plz->window_pos &= WINDOW_MASK; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
137 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
138 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
139 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
140 return plz->buffer_out_size; |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
141 } |
9cecc930d78f
fluid-mnf: original source from TI,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
142 |