FreeCalypso > hg > freecalypso-reveng
annotate mysteryffs/scan1.c @ 42:15c2ac2c5c73
pirollback: started
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sat, 06 Jul 2013 20:16:34 +0000 |
parents | d41c555d7f1d |
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rev | line source |
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21
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1 /* |
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2 * This program is the first MysteryFFS analysis tool written. |
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3 * Here I'm trying to understand the meaning of various fields |
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4 * in the index block records. |
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5 */ |
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6 |
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7 #include <sys/types.h> |
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8 #include <sys/file.h> |
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9 #include <sys/stat.h> |
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10 #include <endian.h> |
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11 #include <ctype.h> |
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12 #include <stdio.h> |
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13 #include <string.h> |
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14 #include <strings.h> |
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15 #include <stdlib.h> |
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16 #include <unistd.h> |
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17 |
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18 typedef unsigned char u8; |
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19 typedef unsigned short u16; |
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20 typedef unsigned int u32; |
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21 |
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22 u8 blank_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
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23 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
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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 unknown1; |
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30 u8 type; |
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31 u16 nptr1; |
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32 u16 nptr2; |
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33 u32 dataptr; |
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34 u16 unknown2; |
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35 u16 version; |
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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 read_img_file() |
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45 { |
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46 int fd; |
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47 struct stat st; |
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48 |
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49 fd = open(imgfile, O_RDONLY); |
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50 if (fd < 0) { |
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51 perror(imgfile); |
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52 exit(1); |
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53 } |
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54 fstat(fd, &st); |
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55 if (!S_ISREG(st.st_mode)) { |
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56 fprintf(stderr, "%s is not a regular file\n", imgfile); |
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57 exit(1); |
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58 } |
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59 if (st.st_size < total_img_size) { |
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60 fprintf(stderr, "%s has fewer than 0x%x bytes\n", imgfile, |
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61 total_img_size); |
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62 exit(1); |
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63 } |
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64 image = malloc(total_img_size); |
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65 if (!image) { |
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66 perror("malloc"); |
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67 exit(1); |
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68 } |
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69 read(fd, image, total_img_size); |
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70 close(fd); |
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71 } |
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72 |
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73 find_index_block() |
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74 { |
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75 int i; |
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76 u8 *ptr; |
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77 |
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78 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { |
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79 if (bcmp(ptr, mysteryffs_hdr, 6)) |
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80 continue; |
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81 if (ptr[8] != 0xAB) |
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82 continue; |
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83 indexblk = ptr; |
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84 return(0); |
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85 } |
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86 fprintf(stderr, "could not find a MysteryFFS index block in %s\n", |
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87 imgfile); |
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88 exit(1); |
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89 } |
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90 |
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91 is_namestr_ok(s) |
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92 char *s; |
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93 { |
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94 int cnt; |
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95 |
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96 for (cnt = 0; *s; s++, cnt++) { |
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97 if (cnt >= 32) |
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98 return(0); |
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99 if (!isprint(*s)) |
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100 return(0); |
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101 } |
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102 if (cnt) |
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103 return(1); |
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104 else |
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105 return(0); |
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106 } |
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107 |
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108 char * |
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109 dataptr_to_name(dptr) |
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110 u32 dptr; |
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111 { |
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112 u8 *data; |
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113 |
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114 if (dptr > 0x0FFFFFFF) { |
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115 inv: return("<invptr>"); |
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116 } |
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117 dptr <<= 4; |
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118 if (dptr >= total_img_size) |
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119 goto inv; |
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120 data = image + dptr; |
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121 if (is_namestr_ok(data)) |
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122 return(data); |
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123 else |
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124 return("<notname>"); |
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125 } |
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126 |
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127 dump_entry(rawptr, entrynum) |
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128 u8 *rawptr; |
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129 { |
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130 struct index_entry ent; |
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131 |
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132 bcopy(rawptr, &ent, 0x10); |
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133 ent.len = le16toh(ent.len); |
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134 ent.nptr1 = le16toh(ent.nptr1); |
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135 ent.nptr2 = le16toh(ent.nptr2); |
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136 ent.dataptr = le32toh(ent.dataptr); |
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137 ent.unknown2 = le16toh(ent.unknown2); |
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138 ent.version = le16toh(ent.version); |
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139 printf("%x %s: len=%x %02X %02X nptr1=%x nptr2=%x %04X %04X\n", |
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140 entrynum, dataptr_to_name(ent.dataptr), |
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141 ent.len, ent.unknown1, ent.type, |
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142 ent.nptr1, ent.nptr2, |
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143 ent.unknown2, ent.version); |
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144 } |
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145 |
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146 dump_index() |
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147 { |
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148 u32 offset; |
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149 u8 *entry; |
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150 |
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151 for (offset = 0x10; offset < eraseblk_size; offset += 0x10) { |
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152 entry = indexblk + offset; |
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153 if (!bcmp(entry, blank_line, 16)) |
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154 continue; |
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155 dump_entry(entry, offset >> 4); |
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156 } |
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157 } |
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158 |
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159 main(argc, argv) |
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160 char **argv; |
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161 { |
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162 if (argc != 4) { |
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163 fprintf(stderr, "usage: %s imgfile blksize nblocks\n", argv[0]); |
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164 exit(1); |
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165 } |
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166 imgfile = argv[1]; |
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167 eraseblk_size = strtoul(argv[2], 0, 0); |
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168 total_blocks = strtoul(argv[3], 0, 0); |
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169 total_img_size = eraseblk_size * total_blocks; |
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170 read_img_file(); |
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171 find_index_block(); |
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172 dump_index(); |
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173 exit(0); |
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174 } |