FreeCalypso > hg > freecalypso-sw
annotate ffstools/tiffs-rd/inode.c @ 276:909f00c15f27
more fc-fsio foundation
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sun, 23 Feb 2014 21:31:30 +0000 |
parents | 024042383a26 |
children | 09b8b2327838 |
rev | line source |
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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->ino = ino; |
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62 inf->len = le16toh(fl->len); |
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63 if (inf->len & 0xF) { |
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64 fprintf(stderr, |
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65 "warning: inode #%x: invalid length, skipping\n", ino); |
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66 free(inf); |
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67 return(0); |
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68 } |
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69 inf->type = fl->type; |
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70 switch (inf->type) { |
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71 case 0x00: |
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72 break; |
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73 case 0xE1: |
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74 case 0xF1: |
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75 case 0xF2: |
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76 case 0xF3: |
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77 case 0xF4: |
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78 if (!inf->len) { |
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79 fprintf(stderr, |
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80 "warning: inode #%x: non-deleted object has zero length, skipping\n", |
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81 ino); |
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82 free(inf); |
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83 return(0); |
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84 } |
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85 break; |
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86 default: |
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87 fprintf(stderr, |
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88 "warning: inode #%x: unexpected object type %02X, skipping\n", |
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89 ino, inf->type); |
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90 free(inf); |
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91 return(0); |
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92 } |
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93 if (convert_ptr(le16toh(fl->descend), &inf->descend) < 0) { |
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94 fprintf(stderr, |
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95 "warning: inode #%x: invalid descend pointer, skipping\n", |
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96 ino); |
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97 free(inf); |
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98 return(0); |
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99 } |
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100 if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) { |
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101 fprintf(stderr, |
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102 "warning: inode #%x: invalid sibling pointer, skipping\n", |
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103 ino); |
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104 free(inf); |
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105 return(0); |
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106 } |
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107 if (inf->len) { |
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108 inf->rawloc = le32toh(fl->dataptr); |
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109 if (inf->rawloc > 0x0FFFFFFF) { |
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110 invdptr: fprintf(stderr, |
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111 "warning: inode #%x: invalid data pointer, skipping\n", |
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112 ino); |
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113 free(inf); |
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114 return(0); |
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115 } |
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116 inf->offset = inf->rawloc << 4; |
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117 if (inf->offset >= total_ffs_size) |
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118 goto invdptr; |
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119 if (inf->offset + inf->len > total_ffs_size) { |
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120 fprintf(stderr, |
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121 "warning: inode #%x: data pointer + length > FFS total size, skipping\n", |
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122 ino); |
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123 free(inf); |
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124 return(0); |
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125 } |
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126 inf->dataptr = image + inf->offset; |
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127 } |
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128 inode_info[ino] = inf; |
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129 return(1); |
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130 } |
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131 |
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132 find_root_inode() |
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133 { |
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134 int ino; |
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135 |
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136 if (root_inode) { |
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137 if (!validate_inode(root_inode)) { |
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138 fprintf(stderr, |
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139 "error: root inode specified with -r is invalid\n"); |
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140 exit(1); |
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141 } |
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142 return(1); |
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143 } |
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144 for (ino = 1; ino < inode_limit; ino++) { |
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145 if (!validate_inode(ino)) |
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146 continue; |
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147 if (inode_info[ino]->type != 0xF2) |
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148 continue; |
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149 if (*inode_info[ino]->dataptr != '/') |
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150 continue; |
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151 root_inode = ino; |
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152 if (verbose) |
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153 fprintf(stderr, "Found root inode at #%x\n", ino); |
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154 if (inode_info[ino]->sibling) |
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155 fprintf(stderr, |
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156 "warning: root inode #%x has a non-null sibling pointer\n", |
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157 ino); |
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158 return(0); |
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159 } |
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160 fprintf(stderr, "error: no root inode found; try -r\n"); |
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161 exit(1); |
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162 } |