FreeCalypso > hg > freecalypso-tools

annotate ringtools/fc-e1decode.c @ 412:a5dab452be0d

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mokosrec2bin utility imported from the old freecalypso-reveng tree, header comments changed for new understanding and new usage in forward rather than reverse engineering
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 25 Oct 2018 19:23:35 +0000
parents c8806a5d4a6a
children
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176
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program decodes a binary Melody E1 file into the ASCII source format
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3 * of our own invention which fc-e1gen accepts as input.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <ctype.h>
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10 #include <string.h>
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11 #include <strings.h>
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12
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13 char *infname;
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14 FILE *inf, *outf;
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15
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16 static unsigned
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17 get_word()
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18 {
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19 u_char b[2];
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20 int i, c;
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21
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22 for (i = 0; i < 2; i++) {
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23 c = getc(inf);
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24 if (c < 0) {
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25 fprintf(stderr, "error: premature EOF in %s\n",
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26 infname);
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27 exit(1);
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28 }
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29 b[i] = c;
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30 }
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31 return((b[1] << 8) | b[0]);
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32 }
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33
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34 do_global_osc_set()
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35 {
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36 unsigned word, osc;
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37
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38 word = get_word();
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39 fprintf(outf, "osc-set (%u)", word & 0xFF);
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40 for (osc = 0; osc < 8; osc++)
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41 if (word & (1 << (osc + 8)))
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42 fprintf(outf, " %u", osc);
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43 putc('\n', outf);
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44 putc('\n', outf);
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45 }
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46
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47 convert_signed_14bit(u)
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48 unsigned u;
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49 {
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50 int i;
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51
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52 i = u;
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53 if (i >= 8192)
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54 i -= 16384;
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55 return (i);
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56 }
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57
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58 convert_signed_5bit(u)
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59 unsigned u;
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60 {
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61 int i;
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62
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63 i = u;
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64 if (i >= 16)
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65 i -= 32;
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66 return (i);
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67 }
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68
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69 process_oscwords(osc, warnflags)
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70 unsigned osc, *warnflags;
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71 {
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72 unsigned word0, word1, extraword;
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73
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74 word0 = get_word();
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75 word1 = get_word();
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76 if (word1 & 0xF)
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77 *warnflags |= 1;
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78 fprintf(outf, "osc %u (%u)", osc, word0 & 1);
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79 if (word0 & 2) {
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80 fprintf(outf, " df %d %u", convert_signed_14bit(word0 >> 2),
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81 word1 >> 6);
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82 } else {
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83 if (word0 & 4)
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84 fputs(" sq1", outf);
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85 if (word0 & 8)
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86 fputs(" sq2", outf);
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87 fprintf(outf, " %u %u %u", (word0 >> 4) & 0x3F, word0 >> 10,
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88 word1 >> 6);
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89 }
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90 if (word1 & 0x10) {
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91 extraword = get_word();
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92 if (extraword & 0xFF)
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93 *warnflags |= 2;
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94 fprintf(outf, " trem %u %d", (extraword >> 8) & 7,
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95 convert_signed_5bit(extraword >> 11));
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96 }
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97 if (word1 & 0x20) {
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98 extraword = get_word();
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99 fprintf(outf, " env %u %u %u %u %u", extraword & 0xF,
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100 extraword >> 13, (extraword >> 10) & 7,
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101 (extraword >> 7) & 7, (extraword >> 4) & 7);
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102 }
178
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103 putc('\n', outf);
176
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104 }
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105
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106 process_block(timeword)
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107 unsigned timeword;
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108 {
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109 unsigned osc, warnflags[8], anywarn;
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110
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111 fprintf(outf, "time %u\n", timeword & 0xFF);
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112 for (osc = 0; osc < 8; osc++) {
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113 warnflags[osc] = 0;
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114 if (timeword & (1 << (osc + 8)))
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115 process_oscwords(osc, warnflags + osc);
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116 }
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117 putc('\n', outf);
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118 anywarn = 0;
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119 for (osc = 0; osc < 8; osc++) {
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120 if (warnflags[osc] & 1) {
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121 fprintf(outf,
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122 "# warning: reserved bits set in osc %u word1 above\n",
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123 osc);
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124 anywarn = 1;
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125 }
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126 if (warnflags[osc] & 2) {
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127 fprintf(outf,
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128 "# warning: reserved bits set in osc %u word2 above\n",
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129 osc);
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130 anywarn = 1;
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131 }
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132 }
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133 if (anywarn)
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134 putc('\n', outf);
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135 }
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136
2b38691076b9 fc-e1decode utility written, compiles
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137 main(argc, argv)
2b38691076b9 fc-e1decode utility written, compiles
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138 char **argv;
2b38691076b9 fc-e1decode utility written, compiles
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139 {
2b38691076b9 fc-e1decode utility written, compiles
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140 unsigned timeword;
2b38691076b9 fc-e1decode utility written, compiles
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141
2b38691076b9 fc-e1decode utility written, compiles
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142 if (argc < 2 || argc > 3) {
2b38691076b9 fc-e1decode utility written, compiles
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143 fprintf(stderr, "usage: %s infile [outfile]\n", argv[0]);
2b38691076b9 fc-e1decode utility written, compiles
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144 exit(1);
2b38691076b9 fc-e1decode utility written, compiles
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145 }
2b38691076b9 fc-e1decode utility written, compiles
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146 infname = argv[1];
2b38691076b9 fc-e1decode utility written, compiles
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147 inf = fopen(infname, "r");
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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148 if (!inf) {
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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149 perror(infname);
2b38691076b9 fc-e1decode utility written, compiles
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150 exit(1);
2b38691076b9 fc-e1decode utility written, compiles
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151 }
2b38691076b9 fc-e1decode utility written, compiles
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152 if (argc > 2) {
2b38691076b9 fc-e1decode utility written, compiles
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153 outf = fopen(argv[2], "w");
2b38691076b9 fc-e1decode utility written, compiles
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154 if (!outf) {
2b38691076b9 fc-e1decode utility written, compiles
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155 perror(argv[2]);
2b38691076b9 fc-e1decode utility written, compiles
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156 exit(1);
2b38691076b9 fc-e1decode utility written, compiles
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157 }
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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158 } else
2b38691076b9 fc-e1decode utility written, compiles
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159 outf = stdout;
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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160 do_global_osc_set();
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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161 for (;;) {
2b38691076b9 fc-e1decode utility written, compiles
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162 timeword = get_word();
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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163 if (timeword == 0)
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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164 break;
2b38691076b9 fc-e1decode utility written, compiles
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165 process_block(timeword);
2b38691076b9 fc-e1decode utility written, compiles
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166 }
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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167 fputs("end\n", outf);
2b38691076b9 fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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168 exit(0);
2b38691076b9 fc-e1decode utility written, compiles
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169 }