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annotate mysteryffs/dump1.c @ 88:691551f0635b

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armdis: implemented decoding of data processing instructions
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 29 Mar 2014 20:28:13 +0000
parents 00ad22936ca5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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22
00ad22936ca5 MysteryFFS dump1 tool written
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1 /*
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2 * This program attempts to traverse the FFS directory tree
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3 * from the root down, following the descendant and sibling
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4 * pointers, and dumps everything it encounters.
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5 *
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6 * The objective is to understand how to extract the precise
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7 * content of data files.
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8 */
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9
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10 #include <sys/types.h>
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11 #include <sys/file.h>
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12 #include <sys/stat.h>
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13 #include <endian.h>
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14 #include <ctype.h>
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15 #include <stdio.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include <stdlib.h>
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19 #include <unistd.h>
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20
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21 typedef unsigned char u8;
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22 typedef unsigned short u16;
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23 typedef unsigned int u32;
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24
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25 u8 mysteryffs_hdr[6] = {'F', 'f', 's', '#', 0x10, 0x02};
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26
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27 struct index_entry {
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28 u16 len;
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29 u8 unknown_b1;
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30 u8 type;
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31 u16 descend;
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32 u16 sibling;
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33 u32 dataptr;
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34 u16 unknown_w1;
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35 u16 unknown_w2;
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36 };
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37
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38 char *imgfile;
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39 u32 eraseblk_size;
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40 int total_blocks;
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41 u32 total_img_size;
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42 u8 *image, *indexblk;
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43
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44 char workpath[512];
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45
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46 read_img_file()
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47 {
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48 int fd;
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49 struct stat st;
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50
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51 fd = open(imgfile, O_RDONLY);
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52 if (fd < 0) {
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53 perror(imgfile);
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54 exit(1);
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55 }
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56 fstat(fd, &st);
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57 if (!S_ISREG(st.st_mode)) {
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58 fprintf(stderr, "%s is not a regular file\n", imgfile);
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59 exit(1);
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60 }
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61 if (st.st_size < total_img_size) {
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62 fprintf(stderr, "%s has fewer than 0x%x bytes\n", imgfile,
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63 total_img_size);
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64 exit(1);
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65 }
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66 image = malloc(total_img_size);
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67 if (!image) {
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68 perror("malloc");
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69 exit(1);
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70 }
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71 read(fd, image, total_img_size);
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72 close(fd);
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73 }
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74
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75 find_index_block()
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76 {
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77 int i;
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78 u8 *ptr;
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79
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80 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) {
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81 if (bcmp(ptr, mysteryffs_hdr, 6))
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82 continue;
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83 if (ptr[8] != 0xAB)
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84 continue;
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85 printf("Found index in erase block #%d (offset %x)\n", i,
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86 ptr - image);
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87 indexblk = ptr;
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88 return(0);
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89 }
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90 fprintf(stderr, "could not find a MysteryFFS index block in %s\n",
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91 imgfile);
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92 exit(1);
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93 }
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94
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95 get_index_entry(num, host)
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96 int num;
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97 struct index_entry *host;
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98 {
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99 struct index_entry *le;
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100
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101 le = (struct index_entry *) indexblk + num;
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102 host->len = le16toh(le->len);
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103 host->unknown_b1 = le->unknown_b1;
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104 host->type = le->type;
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105 host->descend = le16toh(le->descend);
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106 host->sibling = le16toh(le->sibling);
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107 host->dataptr = le32toh(le->dataptr);
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108 host->unknown_w1 = le16toh(le->unknown_w1);
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109 host->unknown_w2 = le16toh(le->unknown_w2);
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110 }
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111
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112 is_namestr_ok(s)
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113 char *s;
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114 {
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115 int cnt;
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116
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117 for (cnt = 0; *s; s++, cnt++) {
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118 if (cnt >= 32)
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119 return(0);
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120 if (!isprint(*s))
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121 return(0);
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122 }
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123 if (cnt)
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124 return(1);
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125 else
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126 return(0);
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127 }
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128
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129 char *
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130 get_name(dptr)
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131 u32 dptr;
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132 {
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133 u8 *name;
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134
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135 if (dptr > 0x0FFFFFFF)
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136 return(0);
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137 dptr <<= 4;
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138 if (dptr >= total_img_size - 32)
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139 return(0);
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140 name = image + dptr;
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141 if (is_namestr_ok(name))
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142 return(name);
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143 else
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144 return(0);
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145 }
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146
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147 dump_common(idx, rec, path_prefix, typestr, newprefix)
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148 int idx, path_prefix, *newprefix;
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149 struct index_entry *rec;
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150 char *typestr;
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151 {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 u8 *name;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 name = get_name(rec->dataptr);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 if (!name) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 printf("entry #%x has an invalid name pointer!\n", idx);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 return(-1);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159 if (sizeof(workpath) - path_prefix < strlen(name) + 2) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 printf("entry #%x: pathname buffer overflow!\n", idx);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 return(-1);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 path_prefix += sprintf(workpath + path_prefix, "/%s", name);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 printf("\n%s (%s)\n", workpath, typestr);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 printf("len=%x, unknown fields: %02X %04X %04X\n", rec->len,
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 rec->unknown_b1, rec->unknown_w1, rec->unknown_w2);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
167 if (newprefix)
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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168 *newprefix = path_prefix;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
169 return(0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
170 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
171
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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172 dump_dir(firstent, path_prefix)
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
173 {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
174 struct index_entry rec;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
175 int ent;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
176 int subprefix;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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177
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 for (ent = firstent; ent != 0xFFFF; ent = rec.sibling) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
179 get_index_entry(ent, &rec);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
180 switch (rec.type) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
181 case 0x00:
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
182 /* deleted object - skip it */
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
183 continue;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
184 case 0xF2:
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
185 /* subdirectory */
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
186 if (dump_common(ent, &rec, path_prefix, "directory",
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
187 &subprefix) < 0)
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
188 continue;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
189 dump_dir(rec.descend, subprefix);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
190 continue;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
191 case 0xF1:
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
192 /* regular file */
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
193 dump_common(ent, &rec, path_prefix, "file", 0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
194 continue;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
195 case 0xE1:
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
196 /* special .journal file */
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
197 dump_common(ent, &rec, path_prefix, "E1 file", 0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
198 continue;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
199 default:
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
200 printf("entry #%x: unexpected type %02X\n", ent,
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
201 rec.type);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
202 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
203 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
204 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
205
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
206 dump_root()
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
207 {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
208 struct index_entry rec;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
209 char *name;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
210
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
211 get_index_entry(1, &rec);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
212 if (rec.type != 0xF2) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
213 fprintf(stderr,
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
214 "error: entry #1 (expected root dir) is not a directory\n");
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
215 exit(1);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
216 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
217 name = get_name(rec.dataptr);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
218 if (!name) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
219 fprintf(stderr, "root entry has an invalid name pointer!\n");
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
220 exit(1);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
221 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
222 printf("Root node name: %s\n", name);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
223 printf("len=%x, unknown fields: %02X %04X %04X\n", rec.len,
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
224 rec.unknown_b1, rec.unknown_w1, rec.unknown_w2);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
225 if (rec.sibling != 0xFFFF)
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
226 printf("warning: root entry has a non-nil sibling pointer\n");
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
227 dump_dir(rec.descend, 0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
228 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
229
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
230 main(argc, argv)
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
231 char **argv;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
232 {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
233 if (argc != 4) {
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
234 fprintf(stderr, "usage: %s imgfile blksize nblocks\n", argv[0]);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
235 exit(1);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
236 }
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
237 imgfile = argv[1];
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
238 eraseblk_size = strtoul(argv[2], 0, 0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
239 total_blocks = strtoul(argv[3], 0, 0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
240 total_img_size = eraseblk_size * total_blocks;
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
241 read_img_file();
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
242 find_index_block();
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
243 dump_root();
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
244 exit(0);
00ad22936ca5 MysteryFFS dump1 tool written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
245 }