annotate ffstools/tiffs-rd/inode.c @ 231:5ceacdbd4490

tiffs IVA: finds the root inode
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 26 Jan 2014 08:11:42 +0000
parents
children 73372cfdaf7f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
231
5ceacdbd4490 tiffs IVA: finds the root inode
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1 /*
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2 * This C module implements the reading and decoding of inode information.
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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 <endian.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "types.h"
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12 #include "struct.h"
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13 #include "globals.h"
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14
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15 u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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16 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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17
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18 alloc_inode_table()
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19 {
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20 inode_info = malloc(sizeof(struct inode_info *) * inode_limit);
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21 if (!inode_info) {
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22 perror("malloc of inode table");
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23 exit(1);
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24 }
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25 bzero(inode_info, sizeof(struct inode_info *) * inode_limit);
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26 }
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27
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28 static int
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29 convert_ptr(in, infp)
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30 int in;
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31 int *infp;
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32 {
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33 if (in == 0xFFFF) {
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34 *infp = 0;
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35 return(0);
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36 }
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37 if (in < 1 || in >= inode_limit)
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38 return(-1);
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39 *infp = in;
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40 return(1);
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41 }
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42
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43 validate_inode(ino)
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44 {
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45 struct inode_flash *fl;
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46 struct inode_info *inf;
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47
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48 if (ino < 1 || ino >= inode_limit)
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49 return(0);
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50 if (inode_info[ino])
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51 return(1);
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52 fl = (struct inode_flash *)inode_block + ino;
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53 if (!bcmp(fl, blank_flash_line, sizeof blank_flash_line))
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54 return(0);
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55 inf = malloc(sizeof(struct inode_info));
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56 if (!inf) {
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57 perror("malloc of struct inode_info");
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58 exit(1);
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59 }
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60 bzero(inf, sizeof(struct inode_info));
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61 inf->len = le16toh(fl->len);
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62 if (inf->len & 0xF) {
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63 fprintf(stderr,
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64 "warning: inode #%x: invalid length, skipping\n", ino);
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65 free(inf);
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66 return(0);
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67 }
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68 inf->type = fl->type;
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69 switch (inf->type) {
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70 case 0x00:
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71 break;
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72 case 0xE1:
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73 case 0xF1:
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74 case 0xF2:
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75 case 0xF3:
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76 case 0xF4:
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77 if (!inf->len) {
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78 fprintf(stderr,
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79 "warning: inode #%x: non-deleted object has zero length, skipping\n",
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80 ino);
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81 free(inf);
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82 return(0);
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83 }
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84 break;
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85 default:
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86 fprintf(stderr,
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87 "warning: inode #%x: unexpected object type %02X, skipping\n",
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88 ino, inf->type);
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89 free(inf);
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90 return(0);
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91 }
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92 if (convert_ptr(le16toh(fl->descend), &inf->descend) < 0) {
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93 fprintf(stderr,
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94 "warning: inode #%x: invalid descend pointer, skipping\n",
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95 ino);
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96 free(inf);
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97 return(0);
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98 }
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99 if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) {
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100 fprintf(stderr,
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101 "warning: inode #%x: invalid sibling pointer, skipping\n",
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102 ino);
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103 free(inf);
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104 return(0);
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105 }
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106 if (inf->len) {
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107 inf->rawloc = le32toh(fl->dataptr);
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108 if (inf->rawloc > 0x0FFFFFFF) {
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109 invdptr: fprintf(stderr,
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110 "warning: inode #%x: invalid data pointer, skipping\n",
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111 ino);
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112 free(inf);
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113 return(0);
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114 }
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115 inf->offset = inf->rawloc << 4;
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116 if (inf->offset >= total_ffs_size)
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117 goto invdptr;
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118 if (inf->offset + inf->len > total_ffs_size) {
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119 fprintf(stderr,
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120 "warning: inode #%x: data pointer + length > FFS total size, skipping\n",
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121 ino);
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122 free(inf);
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123 return(0);
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124 }
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125 inf->dataptr = image + inf->offset;
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126 }
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127 inode_info[ino] = inf;
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128 return(1);
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129 }
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130
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131 find_root_inode()
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132 {
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133 int ino;
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134
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135 if (root_inode) {
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136 if (!validate_inode(root_inode)) {
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137 fprintf(stderr,
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138 "error: root inode specified with -r is invalid\n");
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139 exit(1);
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140 }
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141 return(1);
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142 }
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parents:
diff changeset
143 for (ino = 1; ino < inode_limit; ino++) {
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144 if (!validate_inode(ino))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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145 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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146 if (inode_info[ino]->type != 0xF2)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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147 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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148 if (*inode_info[ino]->dataptr != '/')
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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149 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 root_inode = ino;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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151 if (verbose)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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152 fprintf(stderr, "Found root inode at #%x\n", ino);
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parents:
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153 if (inode_info[ino]->sibling)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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154 fprintf(stderr,
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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155 "warning: root inode #%x has a non-null sibling pointer\n",
5ceacdbd4490 tiffs IVA: finds the root inode
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 ino);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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157 return(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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158 }
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parents:
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159 fprintf(stderr, "error: no root inode found; try -r\n");
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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160 exit(1);
5ceacdbd4490 tiffs IVA: finds the root inode
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 }