FreeCalypso > hg > freecalypso-reveng
annotate mysteryffs/extract.c @ 362:b4fb0c7dfdf4
fluid-mnf: added -oC option to use cmd39.m0 for Calypso C05
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 14 Mar 2020 19:44:44 +0000 |
parents | d19b4e20ff9f |
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rev | line source |
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25
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1 /* |
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2 * This program is the logical culmination of the MysteryFFS reverse eng |
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3 * experiments: it walks the FFS directory tree from the root down, |
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4 * recreates a matching tree in the local Unix file system, and |
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5 * extracts the full content of all data files. |
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6 * |
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7 * All acquired understanding of the MysteryFFS structure is tested |
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8 * in the process. |
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9 */ |
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10 |
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11 #include <sys/types.h> |
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12 #include <sys/file.h> |
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13 #include <sys/stat.h> |
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14 #include <endian.h> |
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15 #include <ctype.h> |
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16 #include <stdio.h> |
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17 #include <string.h> |
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18 #include <strings.h> |
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19 #include <stdlib.h> |
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20 #include <unistd.h> |
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21 |
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22 typedef unsigned char u8; |
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23 typedef unsigned short u16; |
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24 typedef unsigned int u32; |
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25 |
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26 u8 mysteryffs_hdr[6] = {'F', 'f', 's', '#', 0x10, 0x02}; |
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27 |
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28 /* actual MysteryFFS on-media structure */ |
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29 struct mysteryffs_index { |
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30 u16 len; |
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31 u8 unknown_b1; |
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32 u8 type; |
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33 u16 descend; |
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34 u16 sibling; |
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35 u32 dataptr; |
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36 u16 unknown_w1; |
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37 u16 unknown_w2; |
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38 }; |
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39 |
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40 /* our own struct for convenience */ |
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41 struct objinfo { |
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42 u16 entryno; |
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43 struct mysteryffs_index *idxrec; |
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44 u8 *dataptr; |
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45 u32 offset; |
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46 u16 len; |
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47 u8 type; |
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48 u16 descend; |
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49 u16 sibling; |
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50 }; |
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51 |
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52 char *imgfile; |
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53 u32 eraseblk_size; |
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54 int total_blocks; |
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55 u32 total_img_size; |
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56 u8 *image, *indexblk; |
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57 |
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58 char workpath[512]; |
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59 |
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60 read_img_file() |
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61 { |
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62 int fd; |
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63 struct stat st; |
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64 |
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65 fd = open(imgfile, O_RDONLY); |
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66 if (fd < 0) { |
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67 perror(imgfile); |
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68 exit(1); |
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69 } |
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70 fstat(fd, &st); |
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71 if (!S_ISREG(st.st_mode)) { |
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72 fprintf(stderr, "%s is not a regular file\n", imgfile); |
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73 exit(1); |
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74 } |
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75 if (st.st_size < total_img_size) { |
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76 fprintf(stderr, "%s has fewer than 0x%x bytes\n", imgfile, |
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77 total_img_size); |
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78 exit(1); |
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79 } |
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80 image = malloc(total_img_size); |
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81 if (!image) { |
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82 perror("malloc"); |
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83 exit(1); |
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84 } |
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85 read(fd, image, total_img_size); |
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86 close(fd); |
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87 } |
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88 |
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89 find_index_block() |
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90 { |
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91 int i; |
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92 u8 *ptr; |
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93 |
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94 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { |
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95 if (bcmp(ptr, mysteryffs_hdr, 6)) |
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96 continue; |
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97 if (ptr[8] != 0xAB) |
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98 continue; |
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99 printf("Found index in erase block #%d (offset %x)\n", i, |
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100 ptr - image); |
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101 indexblk = ptr; |
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102 return(0); |
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103 } |
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104 fprintf(stderr, "could not find a MysteryFFS index block in %s\n", |
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105 imgfile); |
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106 exit(1); |
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107 } |
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108 |
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109 get_index_entry(oi) |
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110 struct objinfo *oi; |
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111 { |
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112 struct mysteryffs_index *le; |
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113 |
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114 if (oi->entryno >= (eraseblk_size >> 4)) { |
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115 fprintf(stderr, |
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116 "error: index block pointer %x past the erase block size!\n", |
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117 oi->entryno); |
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118 exit(1); |
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119 } |
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120 le = (struct mysteryffs_index *) indexblk + oi->entryno; |
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121 oi->idxrec = le; |
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122 oi->len = le16toh(le->len); |
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123 oi->type = le->type; |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
124 oi->descend = le16toh(le->descend); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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125 oi->sibling = le16toh(le->sibling); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
126 return(0); |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
127 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
128 |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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129 validate_chunk(oi) |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
130 struct objinfo *oi; |
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131 { |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
132 u32 dptr; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
133 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
134 if (oi->len & 0xF || !oi->len) { |
ae5337f881e3
MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
135 fprintf(stderr, "index entry #%x: invalid chunk length\n", |
ae5337f881e3
MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
136 oi->entryno); |
ae5337f881e3
MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
137 exit(1); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
138 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
139 dptr = le32toh(oi->idxrec->dataptr); |
ae5337f881e3
MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
140 if (dptr > 0x0FFFFFFF) { |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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141 invdptr: fprintf(stderr, "index entry #%x: invalid data pointer\n", |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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142 oi->entryno); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
143 exit(1); |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
144 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
145 dptr <<= 4; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
146 if (dptr >= total_img_size - oi->len) |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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147 goto invdptr; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
148 oi->offset = dptr; |
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149 oi->dataptr = image + dptr; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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150 return(0); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
151 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
152 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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153 validate_obj_name(oi) |
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154 struct objinfo *oi; |
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|
155 { |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
156 u8 *cp; |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
157 int cnt; |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
158 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
159 for (cp = oi->dataptr, cnt = 0; ; cp++, cnt++) { |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
160 if (cnt >= oi->len) { |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
161 fprintf(stderr, |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
162 "object at index %x: name expected at %x: length overrun\n", |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
163 oi->entryno, oi->offset); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
164 exit(1); |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
165 } |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
166 if (!*cp) |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
167 break; |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
168 if (*cp < '!' || *cp > '~') { |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
169 fprintf(stderr, |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
170 "object at index %x: name expected at %x: bad character\n", |
ae5337f881e3
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diff
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|
171 oi->entryno, oi->offset); |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
172 exit(1); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
173 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
174 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
175 if (!cnt) { |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
176 fprintf(stderr, |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
177 "object at index %x: name expected at %x: null string\n", |
ae5337f881e3
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|
178 oi->entryno, oi->offset); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
179 exit(1); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
180 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
181 return(0); |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
182 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
183 |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
184 name_safe_for_extract(oi) |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
185 struct objinfo *oi; |
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diff
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|
186 { |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
187 char *s; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
188 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
189 s = (char *)oi->dataptr; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
190 if (!isalnum(*s) && *s != '_') |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
191 return(0); |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
192 for (s++; *s; s++) |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
193 if (!isalnum(*s) && *s != '_' && *s != '.') |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
194 return(0); |
ae5337f881e3
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
195 return(1); |
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MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
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|
196 } |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
197 |
26
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|
198 u8 * |
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diff
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|
199 find_end_of_chunk(ch) |
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25
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|
200 struct objinfo *ch; |
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25
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|
201 { |
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25
diff
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|
202 u8 *p; |
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25
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|
203 int i; |
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25
diff
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|
204 |
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25
diff
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|
205 p = ch->dataptr + ch->len; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
25
diff
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|
206 for (i = 1; i <= 16; i++) { |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
changeset
|
207 if (!p[-i]) |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
208 return(p - i); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
209 if (p[-1] != 0xFF) |
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25
diff
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|
210 break; |
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25
diff
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|
211 } |
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25
diff
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|
212 fprintf(stderr, |
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25
diff
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|
213 "chunk starting at %x (index entry %x): no valid termination found\n", |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
214 ch->offset, ch->entryno); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
215 exit(1); |
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25
diff
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|
216 } |
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25
diff
changeset
|
217 |
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parents:
25
diff
changeset
|
218 void |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
219 dump_head_chunk(fd, ch) |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
220 struct objinfo *ch; |
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25
diff
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|
221 { |
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25
diff
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|
222 u8 *endname, *endchunk; |
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25
diff
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|
223 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
224 endname = (u8 *) index((char *)ch->dataptr, '\0') + 1; |
d19b4e20ff9f
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25
diff
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|
225 endchunk = find_end_of_chunk(ch); |
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25
diff
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|
226 if (endchunk <= endname) |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
227 return; |
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25
diff
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|
228 write(fd, endname, endchunk - endname); |
d19b4e20ff9f
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25
diff
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|
229 } |
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25
diff
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|
230 |
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25
diff
changeset
|
231 void |
d19b4e20ff9f
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25
diff
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|
232 dump_extra_chunk(fd, ch) |
d19b4e20ff9f
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25
diff
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|
233 struct objinfo *ch; |
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25
diff
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|
234 { |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
235 u8 *endchunk; |
d19b4e20ff9f
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25
diff
changeset
|
236 |
d19b4e20ff9f
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parents:
25
diff
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|
237 endchunk = find_end_of_chunk(ch); |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
238 write(fd, ch->dataptr, endchunk - ch->dataptr); |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
239 } |
d19b4e20ff9f
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25
diff
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|
240 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
25
diff
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|
241 extract_file(head) |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
242 struct objinfo *head; |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
243 { |
d19b4e20ff9f
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
diff
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|
244 int fd; |
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245 int ent; |
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246 struct objinfo ch; |
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247 |
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248 fd = open(workpath + 1, O_WRONLY|O_CREAT|O_TRUNC, 0666); |
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249 if (fd < 0) { |
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250 perror(workpath + 1); |
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251 exit(1); |
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252 } |
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253 dump_head_chunk(fd, head); |
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254 for (ent = head->descend; ent != 0xFFFF; ent = ch.descend) { |
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255 ch.entryno = ent; |
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256 get_index_entry(&ch); |
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257 if (ch.type != 0xF4) { |
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258 fprintf(stderr, |
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259 "file continuation object at index %x: type %02X != expected F4\n", |
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260 ent, ch.type); |
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261 exit(1); |
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262 } |
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263 validate_chunk(&ch); |
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264 dump_extra_chunk(fd, &ch); |
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265 if (ch.sibling != 0xFFFF) |
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266 printf("warning: file continuation object (index %x) has a non-nil sibling pointer\n", |
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267 ent); |
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268 } |
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269 close(fd); |
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270 } |
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271 |
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272 dump_dir(firstent, path_prefix) |
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273 { |
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274 int ent; |
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275 struct objinfo obj; |
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276 |
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277 for (ent = firstent; ent != 0xFFFF; ent = obj.sibling) { |
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278 obj.entryno = ent; |
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279 get_index_entry(&obj); |
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280 if (!obj.type) /* skip deleted objects w/o further validation */ |
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281 continue; |
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282 validate_chunk(&obj); |
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283 validate_obj_name(&obj); |
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284 if (path_prefix + strlen(obj.dataptr) + 2 > sizeof workpath) { |
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285 fprintf(stderr, |
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286 "handling object at index %x, name \"%s\": path buffer overflow\n", |
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287 obj.entryno, (char *)obj.dataptr); |
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288 exit(1); |
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289 } |
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290 sprintf(workpath + path_prefix, "/%s", (char *)obj.dataptr); |
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291 switch (obj.type) { |
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292 case 0xF2: |
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293 /* directory */ |
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294 printf("dir: %s\n", workpath); |
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295 if (!name_safe_for_extract(&obj)) { |
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296 printf("name contains unsafe characters; subtree skipped\n"); |
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297 continue; |
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298 } |
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299 if (mkdir(workpath + 1, 0777) < 0) { |
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300 perror(workpath + 1); |
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301 exit(1); |
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302 } |
25
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303 dump_dir(obj.descend, strlen(workpath)); |
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304 continue; |
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305 case 0xF1: |
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306 /* regular file */ |
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307 printf("file: %s\n", workpath); |
26
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308 if (!name_safe_for_extract(&obj)) { |
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309 printf("name contains unsafe characters; file skipped\n"); |
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310 continue; |
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311 } |
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312 extract_file(&obj); |
25
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313 continue; |
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314 case 0xE1: |
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315 /* special .journal file */ |
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316 if (path_prefix == 0 && |
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317 !strcmp((char *)obj.dataptr, ".journal")) |
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318 printf("skipping /.journal\n"); |
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319 else |
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320 printf("skipping unexpected E1 file: %s\n", |
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|
321 workpath); |
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322 continue; |
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|
323 default: |
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|
324 printf("%s (index entry #%x): unexpected type %02X; skipping\n", |
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|
325 workpath, obj.entryno, obj.type); |
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|
326 continue; |
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diff
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|
327 } |
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|
328 } |
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diff
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|
329 } |
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diff
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|
330 |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
331 dump_root() |
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diff
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|
332 { |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff
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|
333 struct objinfo root; |
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diff
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|
334 |
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|
335 root.entryno = 1; |
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336 get_index_entry(&root); |
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337 validate_chunk(&root); |
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|
338 validate_obj_name(&root); |
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|
339 printf("Root node name: %s\n", (char *)root.dataptr); |
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|
340 if (root.type != 0xF2) { |
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|
341 fprintf(stderr, |
ae5337f881e3
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diff
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|
342 "error: index entry #1 (expected root dir) is not a directory\n"); |
ae5337f881e3
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diff
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|
343 exit(1); |
ae5337f881e3
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diff
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|
344 } |
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|
345 if (root.sibling != 0xFFFF) |
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|
346 printf("warning: root entry has a non-nil sibling pointer\n"); |
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|
347 dump_dir(root.descend, 0); |
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|
348 } |
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diff
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|
349 |
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|
350 main(argc, argv) |
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|
351 char **argv; |
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diff
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|
352 { |
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|
353 if (argc != 4) { |
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|
354 fprintf(stderr, "usage: %s imgfile blksize nblocks\n", argv[0]); |
ae5337f881e3
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diff
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|
355 exit(1); |
ae5337f881e3
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diff
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|
356 } |
ae5337f881e3
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|
357 imgfile = argv[1]; |
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|
358 eraseblk_size = strtoul(argv[2], 0, 0); |
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|
359 total_blocks = strtoul(argv[3], 0, 0); |
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diff
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|
360 total_img_size = eraseblk_size * total_blocks; |
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|
361 read_img_file(); |
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|
362 find_index_block(); |
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diff
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|
363 dump_root(); |
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364 exit(0); |
ae5337f881e3
MysteryFFS: beginning of the extract utility
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
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365 } |