FreeCalypso > hg > freecalypso-tools
annotate ffstools/tiffs-rd/basics.c @ 941:8fc3b72eb2c6
rvinterf -vv TCH raw dump: write to log only if running with -l
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 24 May 2023 06:46:26 +0000 |
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0
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1 /* |
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2 * This C module implements the "basics" of TIFFS image analysis. |
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3 */ |
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4 |
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5 #include <sys/types.h> |
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6 #include <sys/file.h> |
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7 #include <sys/stat.h> |
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8 #include <sys/mman.h> |
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9 #include <stdio.h> |
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10 #include <stdlib.h> |
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11 #include <unistd.h> |
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12 #include <string.h> |
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13 #include <strings.h> |
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14 #include "types.h" |
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15 #include "struct.h" |
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16 #include "globals.h" |
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17 |
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18 u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02}; |
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19 |
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20 read_ffs_image() |
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21 { |
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22 int fd; |
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23 struct stat st; |
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24 |
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25 fd = open(imgfile, O_RDONLY); |
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26 if (fd < 0) { |
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27 perror(imgfile); |
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28 exit(1); |
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29 } |
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30 fstat(fd, &st); |
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31 if (!S_ISREG(st.st_mode)) { |
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32 fprintf(stderr, "error: %s is not a regular file\n", imgfile); |
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33 exit(1); |
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34 } |
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35 if (st.st_size < imgfile_offset) { |
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36 fprintf(stderr, |
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37 "error: offset given with -o exceeds the size of the file\n"); |
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38 exit(1); |
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39 } |
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40 if (st.st_size - imgfile_offset < total_ffs_size) { |
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41 fprintf(stderr, |
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42 "error: %s is shorter than FFS size of 0x%lx bytes\n", |
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43 imgfile, (u_long)total_ffs_size); |
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44 exit(1); |
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45 } |
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46 image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, |
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47 imgfile_offset); |
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48 if (image == MAP_FAILED) { |
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49 perror("mmap"); |
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50 exit(1); |
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51 } |
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52 close(fd); |
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53 } |
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54 |
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55 cmd_blkhdr() |
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56 { |
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57 int blk; |
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58 u8 *blkhdr; |
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59 |
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60 read_ffs_image(); |
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61 for (blk = 0; blk < total_blocks; blk++) { |
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62 printf("Block %3d: ", blk); |
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63 blkhdr = image + blk * eraseblk_size; |
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64 if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) { |
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65 printf("No TIFFS header\n"); |
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66 continue; |
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67 } |
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68 printf("age %02X%02X, type/status %02X\n", |
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69 blkhdr[7], blkhdr[6], blkhdr[8]); |
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70 } |
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71 exit(0); |
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72 } |
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73 |
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74 find_inode_block() |
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75 { |
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76 int i, abcnt; |
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77 u8 *ptr; |
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78 |
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79 if (index_blk_num >= 0) { |
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80 if (index_blk_num >= total_blocks) { |
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81 fprintf(stderr, |
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82 "invalid block # given with the -a option\n"); |
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83 exit(1); |
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84 } |
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85 ptr = image + index_blk_num * eraseblk_size; |
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86 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { |
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87 fprintf(stderr, |
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88 "error: block specified with -a has no TIFFS header\n"); |
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89 exit(1); |
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90 } |
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91 if (ptr[8] != 0xAB) { |
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92 fprintf(stderr, |
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93 "error: block specified with -a is not an AB block\n"); |
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94 exit(1); |
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95 } |
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96 inode_block = ptr; |
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97 return(0); |
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98 } |
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99 abcnt = 0; |
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100 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { |
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101 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { |
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102 fprintf(stderr, |
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103 "warning: no TIFFS signature in erase block #%d (offset %x)\n", |
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104 i, ptr - image); |
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105 continue; |
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106 } |
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107 switch (ptr[8]) { |
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108 case 0xAB: |
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109 if (verbose) |
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110 fprintf(stderr, |
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111 "Found AB index in erase block #%d (offset %x)\n", |
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112 i, ptr - image); |
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113 index_blk_num = i; |
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114 inode_block = ptr; |
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115 abcnt++; |
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116 continue; |
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117 case 0xBD: |
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118 case 0xBF: |
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119 continue; |
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120 } |
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121 fprintf(stderr, |
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122 "warning: unexpected block type/status %02X at offset %x\n", |
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123 ptr[8], ptr - image); |
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124 } |
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125 if (!inode_block) { |
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126 fprintf(stderr, |
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127 "error: could not find an active inode block in %s\n", |
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128 imgfile); |
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129 exit(1); |
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130 } |
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131 if (abcnt > 1) { |
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132 fprintf(stderr, |
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133 "error: found more than one AB block; use -a\n"); |
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134 exit(1); |
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135 } |
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136 return(0); |
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137 } |
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138 |
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139 cmd_fsinfo() |
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140 { |
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141 read_ffs_image(); |
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142 find_inode_block(); |
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143 printf("Active inode block (AB) is block #%d\n", index_blk_num); |
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144 alloc_inode_table(); |
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145 find_root_inode(); |
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146 printf("Root inode is #%x\n", root_inode); |
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147 if (validate_obj_name(root_inode, 1)) { |
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148 printf("Root inode (format) name: %s\n", |
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149 inode_info[root_inode]->dataptr); |
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150 exit(0); |
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151 } else { |
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152 printf("No valid name found in the root inode!\n"); |
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153 exit(1); |
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154 } |
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155 } |