FreeCalypso > hg > freecalypso-tools

annotate ffstools/tiffs-rd/inode.c @ 850:52f507580d78

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CHANGES: document all current lunadrv changes
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 18 Aug 2021 04:30:21 +0000
parents e7502631a0f9
children
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0
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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50 if (inode_info[ino])
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Mychaela Falconia <falcon@freecalypso.org>
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51 return(1);
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Mychaela Falconia <falcon@freecalypso.org>
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52 fl = (struct inode_flash *)inode_block + ino;
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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89 ino, inf->type);
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Mychaela Falconia <falcon@freecalypso.org>
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90 free(inf);
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91 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
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92 }
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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99 }
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100 if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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101 fprintf(stderr,
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102 "warning: inode #%x: invalid sibling pointer, skipping\n",
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Mychaela Falconia <falcon@freecalypso.org>
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103 ino);
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Mychaela Falconia <falcon@freecalypso.org>
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104 free(inf);
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Mychaela Falconia <falcon@freecalypso.org>
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105 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
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106 }
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Mychaela Falconia <falcon@freecalypso.org>
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107 if (inf->len) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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108 inf->rawloc = le32toh(fl->dataptr);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 if (old_16bit_location)
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Mychaela Falconia <falcon@freecalypso.org>
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110 inf->rawloc >>= 16;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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111 if (inf->rawloc > 0x0FFFFFFF) {
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Mychaela Falconia <falcon@freecalypso.org>
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112 invdptr: fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
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113 "warning: inode #%x: invalid data pointer, skipping\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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114 ino);
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Mychaela Falconia <falcon@freecalypso.org>
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115 free(inf);
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Mychaela Falconia <falcon@freecalypso.org>
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116 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
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117 }
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
118 inf->offset = inf->rawloc << 4;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 if (inf->offset >= total_ffs_size)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 goto invdptr;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 if (inf->offset + inf->len > total_ffs_size) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 "warning: inode #%x: data pointer + length > FFS total size, skipping\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 ino);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 free(inf);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 return(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 inf->dataptr = image + inf->offset;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 inode_info[ino] = inf;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 return(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 find_root_inode()
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 int ino;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (root_inode) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 if (!validate_inode(root_inode)) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 "error: root inode specified with -r is invalid\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 return(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 for (ino = 1; ino < inode_limit; ino++) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 if (!validate_inode(ino))
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 continue;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 if (inode_info[ino]->type != 0xF2)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 continue;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 if (*inode_info[ino]->dataptr != '/')
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 continue;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 root_inode = ino;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 if (verbose)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 fprintf(stderr, "Found root inode at #%x\n", ino);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 if (inode_info[ino]->sibling)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 "warning: root inode #%x has a non-null sibling pointer\n",
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 ino);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 return(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 fprintf(stderr, "error: no root inode found; try -r\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 exit(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 }