FreeCalypso > hg > freecalypso-reveng
annotate miscprog/mokosrec2bin.c @ 219:e3bbb8cfbbc0
pircalextr: added second argument for output directory
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 28 May 2017 20:33:26 +0000 |
parents | 597143ba1c37 |
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rev | line source |
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cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /* |
cb736d95338d
mokosrec2bin utility written
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2 * The *.m0 format in which the Closedmoko firmware images have been |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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3 * distributed is a form of SREC, but further examination quickly |
cb736d95338d
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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4 * reveals that the data bytes are swapped: the byte order is neither |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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5 * the natural little-endian ARM one of the Calypso, nor a word-wise |
cb736d95338d
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6 * ARM BE; instead the upper and lower bytes of each 16-bit shortword |
cb736d95338d
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7 * are swapped relative to the natural byte/word order of the Calypso |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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8 * ARM processor. |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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9 * |
cb736d95338d
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10 * Before this Closedmoko firmware can be examined with any of the |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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11 * standard reverse eng tools (ARM disassemblers or even the good old |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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12 * strings), it needs to be converted from the weird byte-swapped SREC |
cb736d95338d
mokosrec2bin utility written
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13 * format to straight binary in the natural byte order. The present |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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14 * utility accomplishes that conversion. |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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15 * |
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16 * Written by Spacefalcon the Outlaw. |
cb736d95338d
mokosrec2bin utility written
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17 */ |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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18 |
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19 #include <sys/types.h> |
cb736d95338d
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20 #include <stdio.h> |
cb736d95338d
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21 #include <ctype.h> |
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22 #include <strings.h> |
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23 |
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24 char *infname; |
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25 FILE *inf, *outf; |
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26 u_char fillbyte; |
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27 char srecbuf[80]; |
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28 u_char srecbin[40]; |
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29 int lineno, state; |
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30 u_long lastaddr; |
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31 |
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32 u_char header[6] = {0x06, 0x00, 0x00, 'H', 'D', 'R'}; |
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33 |
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34 decode_hex_byte(s) |
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35 char *s; |
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36 { |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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37 register int u, l; |
cb736d95338d
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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38 |
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39 if (!isxdigit(s[0]) || !isxdigit(s[1])) |
cb736d95338d
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40 return(-1); |
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41 if (isdigit(s[0])) |
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42 u = s[0] - '0'; |
cb736d95338d
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43 else if (isupper(s[0])) |
cb736d95338d
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44 u = s[0] - 'A' + 10; |
cb736d95338d
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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45 else |
cb736d95338d
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46 u = s[0] - 'a' + 10; |
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47 if (isdigit(s[1])) |
cb736d95338d
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48 l = s[1] - '0'; |
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49 else if (isupper(s[1])) |
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50 l = s[1] - 'A' + 10; |
cb736d95338d
mokosrec2bin utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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51 else |
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52 l = s[1] - 'a' + 10; |
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53 return((u << 4) | l); |
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54 } |
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55 |
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56 srec2bin() |
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57 { |
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58 register int i, l, b; |
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59 |
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60 l = decode_hex_byte(srecbuf + 2); |
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61 if (l < 1) { |
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62 fprintf(stderr, "%s line %d: S-record length octet is bad\n", |
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63 infname, lineno); |
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64 exit(1); |
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65 } |
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66 srecbin[0] = l; |
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67 if (l > 35) { |
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68 fprintf(stderr, |
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69 "%s line %d: S-record is longer than expected\n", |
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70 infname, lineno); |
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71 exit(1); |
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72 } |
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73 for (i = 1; i <= l; i++) { |
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74 b = decode_hex_byte(srecbuf + i*2 + 2); |
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75 if (b < 0) { |
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76 fprintf(stderr, "%s line %d: hex decode error\n", |
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77 infname, lineno); |
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78 exit(1); |
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79 } |
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80 srecbin[i] = b; |
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81 } |
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82 return(0); |
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83 } |
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84 |
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85 srec_cksum() |
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86 { |
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87 u_char accum; |
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88 register int i, len; |
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89 |
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90 len = srecbin[0] + 1; |
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91 accum = 0; |
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92 for (i = 0; i < len; i++) |
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93 accum += srecbin[i]; |
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94 if (accum != 0xFF) { |
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95 fprintf(stderr, "%s line %d: bad checksum\n", infname, lineno); |
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96 exit(1); |
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97 } |
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98 return(0); |
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99 } |
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100 |
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101 main(argc, argv) |
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102 char **argv; |
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103 { |
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104 register int i; |
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105 u_long curaddr; |
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106 int datalen; |
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107 |
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108 if (argc < 3 || argc > 4) { |
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109 usage: fprintf(stderr, "usage: %s input.m0 output.bin [fill-byte]\n", |
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110 argv[0]); |
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111 exit(1); |
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112 } |
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113 infname = argv[1]; |
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114 inf = fopen(infname, "r"); |
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115 if (!inf) { |
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116 perror(infname); |
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117 exit(1); |
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118 } |
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119 if (argc > 3) { |
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120 i = decode_hex_byte(argv[3]); |
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121 if (i >= 0) |
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122 fillbyte = i; |
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123 else |
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124 goto usage; |
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125 } else |
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126 fillbyte = 0; |
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127 |
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128 state = 0; |
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129 for (lineno = 1; ; lineno++) { |
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130 if (!fgets(srecbuf, sizeof srecbuf, inf)) { |
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131 fprintf(stderr, "%s: premature EOF\n", infname); |
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132 exit(1); |
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133 } |
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134 if (srecbuf[0] != 'S') { |
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135 fprintf(stderr, "%s line %d: not an S-record\n", |
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136 infname, lineno); |
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137 exit(1); |
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138 } |
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139 switch (srecbuf[1]) { |
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140 case '0': |
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141 if (state == 0) |
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142 break; |
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143 else |
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144 goto badtype; |
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145 case '3': |
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146 if (state == 0) |
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147 goto badtype; |
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148 else |
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149 break; |
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150 case '7': |
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151 if (state == 2) |
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152 break; |
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153 else |
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154 goto badtype; |
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155 default: |
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156 badtype: |
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157 fprintf(stderr, |
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158 "%s line %d: S-record type unexpected\n", |
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159 infname, lineno); |
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160 exit(1); |
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161 } |
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162 srec2bin(); |
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163 srec_cksum(); |
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164 if (state == 0) { |
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165 if (bcmp(srecbin, header, 6)) { |
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166 fprintf(stderr, "%s: expected header missing\n", |
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167 infname); |
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168 exit(1); |
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169 } |
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170 state = 1; |
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171 continue; |
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172 } |
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173 switch (srecbuf[1]) { |
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174 case '3': |
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175 if (srecbin[0] < 6) { |
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176 fprintf(stderr, |
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177 "%s line %d: S3 record is too short\n", |
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178 infname, lineno); |
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179 exit(1); |
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180 } |
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181 curaddr = (srecbin[1] << 24) | (srecbin[2] << 16) | |
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182 (srecbin[3] << 8) | srecbin[4]; |
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183 if (curaddr & 1) { |
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184 fprintf(stderr, "%s line %d: odd address\n", |
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185 infname, lineno); |
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186 exit(1); |
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187 } |
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188 datalen = srecbin[0] - 5; |
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189 if (datalen & 1) { |
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190 fprintf(stderr, "%s line %d: odd data length\n", |
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191 infname, lineno); |
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192 exit(1); |
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193 } |
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194 if (state < 2) { |
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195 outf = fopen(argv[2], "w"); |
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196 if (!outf) { |
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197 perror(argv[2]); |
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198 exit(1); |
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199 } |
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200 state = 2; |
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201 lastaddr = 0; |
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202 } |
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203 if (curaddr < lastaddr) { |
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204 fprintf(stderr, |
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205 "%s line %d: address going backwards\n", |
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206 infname, lineno); |
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207 exit(1); |
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|
208 } |
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209 while (lastaddr < curaddr) { |
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210 putc(fillbyte, outf); |
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211 lastaddr++; |
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212 } |
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213 for (i = 0; i < datalen; i += 2) { |
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214 putc(srecbin[i + 6], outf); |
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215 putc(srecbin[i + 5], outf); |
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216 } |
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217 lastaddr = curaddr + datalen; |
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218 continue; |
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219 case '7': |
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220 fclose(outf); |
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221 exit(0); |
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222 default: |
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223 abort(); |
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224 } |
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225 } |
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226 } |