FreeCalypso > hg > freecalypso-sw
annotate ffstools/tiffs-rd/basics.c @ 230:ffaa033e7643
tiffs IVA: find_inode_block() integrated
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sun, 26 Jan 2014 00:34:22 +0000 |
parents | 24ed817dd25d |
children | 5ceacdbd4490 |
rev | line source |
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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 |
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16 u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02}; |
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17 u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
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18 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
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19 |
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20 extern char *imgfile; |
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21 extern u32 eraseblk_size; |
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22 extern int total_blocks; |
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23 extern u32 total_ffs_size; |
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24 extern int index_blk_num, root_node_no; |
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25 extern int verbose; |
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26 |
230
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27 u8 *image, *inode_block; |
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28 |
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29 read_ffs_image() |
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30 { |
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31 int fd; |
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32 struct stat st; |
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33 |
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34 fd = open(imgfile, O_RDONLY); |
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35 if (fd < 0) { |
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36 perror(imgfile); |
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37 exit(1); |
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38 } |
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39 fstat(fd, &st); |
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40 if (!S_ISREG(st.st_mode)) { |
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41 fprintf(stderr, "error: %s is not a regular file\n", imgfile); |
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42 exit(1); |
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43 } |
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44 if (st.st_size < total_ffs_size) { |
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45 fprintf(stderr, |
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46 "error: %s is shorter than FFS size of 0x%lx bytes\n", |
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47 imgfile, (u_long)total_ffs_size); |
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48 exit(1); |
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49 } |
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50 image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, 0); |
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51 if (image == MAP_FAILED) { |
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52 perror("mmap"); |
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53 exit(1); |
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54 } |
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55 } |
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56 |
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57 cmd_blkhdr() |
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58 { |
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59 int blk; |
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60 u8 *blkhdr; |
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61 |
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62 read_ffs_image(); |
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63 for (blk = 0; blk < total_blocks; blk++) { |
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64 printf("Block %3d: ", blk); |
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65 blkhdr = image + blk * eraseblk_size; |
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66 if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) { |
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67 printf("No TIFFS header\n"); |
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68 continue; |
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69 } |
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70 printf("age %02X%02X, type/status %02X\n", |
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71 blkhdr[7], blkhdr[6], blkhdr[8]); |
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72 } |
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73 exit(0); |
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74 } |
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75 |
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76 find_inode_block() |
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77 { |
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78 int i, abcnt; |
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79 u8 *ptr; |
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80 |
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81 if (index_blk_num >= 0) { |
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82 if (index_blk_num >= total_blocks) { |
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83 fprintf(stderr, |
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84 "invalid block # given with the -a option\n"); |
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85 exit(1); |
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86 } |
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87 ptr = image + index_blk_num * eraseblk_size; |
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88 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { |
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89 fprintf(stderr, |
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90 "error: block specified with -a has no TIFFS header\n"); |
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91 exit(1); |
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92 } |
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93 if (ptr[8] != 0xAB) { |
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94 fprintf(stderr, |
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95 "error: block specified with -a is not an AB block\n"); |
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96 exit(1); |
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97 } |
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98 inode_block = ptr; |
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99 return(0); |
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100 } |
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101 abcnt = 0; |
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102 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { |
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103 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { |
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104 fprintf(stderr, |
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105 "warning: no TIFFS signature in erase block #%d (offset %x)\n", |
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106 i, ptr - image); |
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107 continue; |
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108 } |
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109 switch (ptr[8]) { |
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110 case 0xAB: |
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111 if (verbose) |
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112 printf( |
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113 "Found AB index in erase block #%d (offset %x)\n", |
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114 i, ptr - image); |
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115 index_blk_num = i; |
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116 inode_block = ptr; |
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117 abcnt++; |
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118 continue; |
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119 case 0xBD: |
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120 case 0xBF: |
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121 continue; |
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122 } |
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123 fprintf(stderr, |
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124 "warning: unexpected block type/status %02X at offset %x\n", |
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125 ptr[8], ptr - image); |
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126 } |
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127 if (!inode_block) { |
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128 fprintf(stderr, |
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129 "error: could not find an active inode block in %s\n", |
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130 imgfile); |
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131 exit(1); |
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132 } |
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133 if (abcnt > 1) { |
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134 fprintf(stderr, |
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135 "error: found more than one AB block; use -a\n"); |
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136 exit(1); |
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137 } |
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138 return(0); |
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139 } |
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140 |
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141 cmd_fsinfo() |
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142 { |
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143 read_ffs_image(); |
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144 find_inode_block(); |
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145 printf("Active inode block (AB) is block #%d\n", index_blk_num); |
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146 exit(0); |
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147 } |