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| Rev 3403 | Rev 3535 | ||
|---|---|---|---|
| Line 32... | Line 32... | ||
| 32 | 32 | ||
| 33 | import sys |
33 | import sys |
| 34 | import os |
34 | import os |
| 35 | import random |
35 | import random |
| 36 | import xstruct |
36 | import xstruct |
| - | 37 | import array |
|
| - | 38 | ||
| - | 39 | def align_up(size, alignment): |
|
| - | 40 | "Return size aligned up to alignment" |
|
| - | 41 | ||
| - | 42 | if (size % alignment == 0): |
|
| - | 43 | return size |
|
| - | 44 | ||
| - | 45 | return (((size / alignment) + 1) * alignment) |
|
| - | 46 | ||
| - | 47 | def subtree_size(root, cluster_size, dirent_size): |
|
| - | 48 | "Recursive directory walk and calculate size" |
|
| - | 49 | ||
| - | 50 | size = 0 |
|
| - | 51 | files = 2 |
|
| - | 52 | ||
| - | 53 | for name in os.listdir(root): |
|
| - | 54 | canon = os.path.join(root, name) |
|
| - | 55 | ||
| - | 56 | if (os.path.isfile(canon)): |
|
| - | 57 | size += align_up(os.path.getsize(canon), cluster_size) |
|
| - | 58 | files += 1 |
|
| - | 59 | ||
| - | 60 | if (os.path.isdir(canon)): |
|
| - | 61 | size += subtree_size(canon, cluster_size, dirent_size) |
|
| - | 62 | files += 1 |
|
| - | 63 | ||
| - | 64 | return size + align_up(files * dirent_size, cluster_size) |
|
| - | 65 | ||
| - | 66 | def root_entries(root): |
|
| - | 67 | "Return number of root directory entries" |
|
| - | 68 | ||
| - | 69 | return len(os.listdir(root)) |
|
| - | 70 | ||
| - | 71 | def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters): |
|
| - | 72 | "Store the contents of a file" |
|
| - | 73 | ||
| - | 74 | size = os.path.getsize(path) |
|
| - | 75 | prev = -1 |
|
| - | 76 | first = 0 |
|
| - | 77 | ||
| - | 78 | inf = file(path, "r") |
|
| - | 79 | rd = 0; |
|
| - | 80 | while (rd < size): |
|
| - | 81 | empty_cluster = fat.index(0) |
|
| - | 82 | fat[empty_cluster] = 0xffff |
|
| - | 83 | ||
| - | 84 | if (prev != -1): |
|
| - | 85 | fat[prev] = empty_cluster |
|
| - | 86 | else: |
|
| - | 87 | first = empty_cluster |
|
| - | 88 | ||
| - | 89 | prev = empty_cluster |
|
| - | 90 | ||
| - | 91 | data = inf.read(cluster_size); |
|
| - | 92 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
|
| - | 93 | outf.write(data) |
|
| - | 94 | rd += len(data) |
|
| - | 95 | inf.close() |
|
| - | 96 | ||
| - | 97 | return first, size |
|
| - | 98 | ||
| - | 99 | def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster): |
|
| - | 100 | "Store the contents of a directory" |
|
| - | 101 | ||
| - | 102 | length = len(directory) |
|
| - | 103 | size = length * dirent_size |
|
| - | 104 | prev = -1 |
|
| - | 105 | first = 0 |
|
| - | 106 | ||
| - | 107 | i = 0 |
|
| - | 108 | rd = 0; |
|
| - | 109 | while (rd < size): |
|
| - | 110 | if (prev != -1): |
|
| - | 111 | empty_cluster = fat.index(0) |
|
| - | 112 | fat[empty_cluster] = 0xffff |
|
| - | 113 | fat[prev] = empty_cluster |
|
| - | 114 | else: |
|
| - | 115 | first = empty_cluster |
|
| - | 116 | ||
| - | 117 | prev = empty_cluster |
|
| - | 118 | ||
| - | 119 | data = '' |
|
| - | 120 | data_len = 0 |
|
| - | 121 | while ((i < length) and (data_len < cluster_size)): |
|
| - | 122 | if (i == 0): |
|
| - | 123 | directory[i].cluster = empty_cluster |
|
| - | 124 | ||
| - | 125 | data += directory[i].pack() |
|
| - | 126 | data_len += dirent_size |
|
| - | 127 | i += 1 |
|
| - | 128 | ||
| - | 129 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
|
| - | 130 | outf.write(data) |
|
| - | 131 | rd += len(data) |
|
| - | 132 | ||
| - | 133 | return first, size |
|
| - | 134 | ||
| - | 135 | DIR_ENTRY = """little: |
|
| - | 136 | char name[8] /* file name */ |
|
| - | 137 | char ext[3] /* file extension */ |
|
| - | 138 | uint8_t attr /* file attributes */ |
|
| - | 139 | padding[1] /* reserved for NT */ |
|
| - | 140 | uint8_t ctime_fine /* create time (fine resolution) */ |
|
| - | 141 | uint16_t ctime /* create time */ |
|
| - | 142 | uint16_t cdate /* create date */ |
|
| - | 143 | uint16_t adate /* access date */ |
|
| - | 144 | padding[2] /* EA-index */ |
|
| - | 145 | uint16_t mtime /* modification time */ |
|
| - | 146 | uint16_t mdate /* modification date */ |
|
| - | 147 | uint16_t cluster /* first cluster */ |
|
| - | 148 | uint32_t size /* file size */ |
|
| - | 149 | """ |
|
| - | 150 | ||
| - | 151 | DOT_DIR_ENTRY = """little: |
|
| - | 152 | uint8_t signature /* 0x2e signature */ |
|
| - | 153 | char name[7] /* empty */ |
|
| - | 154 | char ext[3] /* empty */ |
|
| - | 155 | uint8_t attr /* file attributes */ |
|
| - | 156 | padding[1] /* reserved for NT */ |
|
| - | 157 | uint8_t ctime_fine /* create time (fine resolution) */ |
|
| - | 158 | uint16_t ctime /* create time */ |
|
| - | 159 | uint16_t cdate /* create date */ |
|
| - | 160 | uint16_t adate /* access date */ |
|
| - | 161 | padding[2] /* EA-index */ |
|
| - | 162 | uint16_t mtime /* modification time */ |
|
| - | 163 | uint16_t mdate /* modification date */ |
|
| - | 164 | uint16_t cluster /* first cluster */ |
|
| - | 165 | uint32_t size /* file size */ |
|
| - | 166 | """ |
|
| - | 167 | ||
| - | 168 | DOTDOT_DIR_ENTRY = """little: |
|
| - | 169 | uint8_t signature[2] /* 0x2e signature */ |
|
| - | 170 | char name[6] /* empty */ |
|
| - | 171 | char ext[3] /* empty */ |
|
| - | 172 | uint8_t attr /* file attributes */ |
|
| - | 173 | padding[1] /* reserved for NT */ |
|
| - | 174 | uint8_t ctime_fine /* create time (fine resolution) */ |
|
| - | 175 | uint16_t ctime /* create time */ |
|
| - | 176 | uint16_t cdate /* create date */ |
|
| - | 177 | uint16_t adate /* access date */ |
|
| - | 178 | padding[2] /* EA-index */ |
|
| - | 179 | uint16_t mtime /* modification time */ |
|
| - | 180 | uint16_t mdate /* modification date */ |
|
| - | 181 | uint16_t cluster /* first cluster */ |
|
| - | 182 | uint32_t size /* file size */ |
|
| - | 183 | """ |
|
| - | 184 | ||
| - | 185 | def mangle_fname(name): |
|
| - | 186 | # FIXME: filter illegal characters |
|
| - | 187 | parts = name.split('.') |
|
| - | 188 | ||
| - | 189 | if (len(parts) > 0): |
|
| - | 190 | fname = parts[0] |
|
| - | 191 | else: |
|
| - | 192 | fname = '' |
|
| - | 193 | ||
| - | 194 | return (fname + ' ').upper()[0:8] |
|
| - | 195 | ||
| - | 196 | def mangle_ext(name): |
|
| - | 197 | # FIXME: filter illegal characters |
|
| - | 198 | parts = name.split('.') |
|
| - | 199 | ||
| - | 200 | if (len(parts) > 1): |
|
| - | 201 | ext = parts[1] |
|
| - | 202 | else: |
|
| - | 203 | ext = '' |
|
| - | 204 | ||
| - | 205 | return (ext + ' ').upper()[0:3] |
|
| - | 206 | ||
| - | 207 | def create_dirent(name, directory, cluster, size): |
|
| - | 208 | dir_entry = xstruct.create(DIR_ENTRY) |
|
| - | 209 | ||
| - | 210 | dir_entry.name = mangle_fname(name) |
|
| - | 211 | dir_entry.ext = mangle_ext(name) |
|
| - | 212 | ||
| - | 213 | if (directory): |
|
| - | 214 | dir_entry.attr = 0x30 |
|
| - | 215 | else: |
|
| - | 216 | dir_entry.attr = 0x20 |
|
| - | 217 | ||
| - | 218 | dir_entry.ctime_fine = 0 # FIXME |
|
| - | 219 | dir_entry.ctime = 0 # FIXME |
|
| - | 220 | dir_entry.cdate = 0 # FIXME |
|
| - | 221 | dir_entry.adate = 0 # FIXME |
|
| - | 222 | dir_entry.mtime = 0 # FIXME |
|
| - | 223 | dir_entry.mdate = 0 # FIXME |
|
| - | 224 | dir_entry.cluster = cluster |
|
| - | 225 | ||
| - | 226 | if (directory): |
|
| - | 227 | dir_entry.size = 0 |
|
| - | 228 | else: |
|
| - | 229 | dir_entry.size = size |
|
| - | 230 | ||
| - | 231 | return dir_entry |
|
| - | 232 | ||
| - | 233 | def create_dot_dirent(empty_cluster): |
|
| - | 234 | dir_entry = xstruct.create(DOT_DIR_ENTRY) |
|
| - | 235 | ||
| - | 236 | dir_entry.signature = 0x2e |
|
| - | 237 | dir_entry.name = ' ' |
|
| - | 238 | dir_entry.ext = ' ' |
|
| - | 239 | dir_entry.attr = 0x10 |
|
| - | 240 | ||
| - | 241 | dir_entry.ctime_fine = 0 # FIXME |
|
| - | 242 | dir_entry.ctime = 0 # FIXME |
|
| - | 243 | dir_entry.cdate = 0 # FIXME |
|
| - | 244 | dir_entry.adate = 0 # FIXME |
|
| - | 245 | dir_entry.mtime = 0 # FIXME |
|
| - | 246 | dir_entry.mdate = 0 # FIXME |
|
| - | 247 | dir_entry.cluster = empty_cluster |
|
| - | 248 | dir_entry.size = 0 |
|
| - | 249 | ||
| - | 250 | return dir_entry |
|
| - | 251 | ||
| - | 252 | def create_dotdot_dirent(parent_cluster): |
|
| - | 253 | dir_entry = xstruct.create(DOTDOT_DIR_ENTRY) |
|
| - | 254 | ||
| - | 255 | dir_entry.signature = [0x2e, 0x2e] |
|
| - | 256 | dir_entry.name = ' ' |
|
| - | 257 | dir_entry.ext = ' ' |
|
| - | 258 | dir_entry.attr = 0x10 |
|
| - | 259 | ||
| - | 260 | dir_entry.ctime_fine = 0 # FIXME |
|
| - | 261 | dir_entry.ctime = 0 # FIXME |
|
| - | 262 | dir_entry.cdate = 0 # FIXME |
|
| - | 263 | dir_entry.adate = 0 # FIXME |
|
| - | 264 | dir_entry.mtime = 0 # FIXME |
|
| - | 265 | dir_entry.mdate = 0 # FIXME |
|
| - | 266 | dir_entry.cluster = parent_cluster |
|
| - | 267 | dir_entry.size = 0 |
|
| - | 268 | ||
| - | 269 | return dir_entry |
|
| - | 270 | ||
| - | 271 | def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster): |
|
| - | 272 | "Recursive directory walk" |
|
| - | 273 | ||
| - | 274 | directory = [] |
|
| - | 275 | ||
| - | 276 | if (not head): |
|
| - | 277 | # Directory cluster preallocation |
|
| - | 278 | empty_cluster = fat.index(0) |
|
| - | 279 | fat[empty_cluster] = 0xffff |
|
| - | 280 | ||
| - | 281 | directory.append(create_dot_dirent(empty_cluster)) |
|
| - | 282 | directory.append(create_dotdot_dirent(parent_cluster)) |
|
| - | 283 | else: |
|
| - | 284 | empty_cluster = 0 |
|
| - | 285 | ||
| - | 286 | for name in os.listdir(root): |
|
| - | 287 | canon = os.path.join(root, name) |
|
| - | 288 | ||
| - | 289 | if (os.path.isfile(canon)): |
|
| - | 290 | rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters) |
|
| - | 291 | directory.append(create_dirent(name, False, rv[0], rv[1])) |
|
| - | 292 | ||
| - | 293 | if (os.path.isdir(canon)): |
|
| - | 294 | rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
|
| - | 295 | directory.append(create_dirent(name, True, rv[0], rv[1])) |
|
| - | 296 | ||
| - | 297 | if (head): |
|
| - | 298 | outf.seek(root_start) |
|
| - | 299 | for dir_entry in directory: |
|
| - | 300 | outf.write(dir_entry.pack()) |
|
| - | 301 | else: |
|
| - | 302 | return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
|
| 37 | 303 | ||
| 38 | BOOT_SECTOR = """little: |
304 | BOOT_SECTOR = """little: |
| 39 | uint8_t jmp[3] /* jump instruction */ |
305 | uint8_t jmp[3] /* jump instruction */ |
| 40 | char oem[8] /* OEM string */ |
306 | char oem[8] /* OEM string */ |
| 41 | uint16_t sector /* bytes per sector */ |
307 | uint16_t sector /* bytes per sector */ |
| Line 60... | Line 326... | ||
| 60 | char fstype[8] /* filesystem type */ |
326 | char fstype[8] /* filesystem type */ |
| 61 | padding[448] /* boot code */ |
327 | padding[448] /* boot code */ |
| 62 | uint8_t boot_signature[2] /* boot signature */ |
328 | uint8_t boot_signature[2] /* boot signature */ |
| 63 | """ |
329 | """ |
| 64 | 330 | ||
| - | 331 | EMPTY_SECTOR = """little: |
|
| - | 332 | padding[512] /* empty sector data */ |
|
| - | 333 | """ |
|
| - | 334 | ||
| - | 335 | FAT_ENTRY = """little: |
|
| - | 336 | uint16_t next /* FAT16 entry */ |
|
| - | 337 | """ |
|
| - | 338 | ||
| 65 | def usage(prname): |
339 | def usage(prname): |
| 66 | "Print usage syntax" |
340 | "Print usage syntax" |
| 67 | print prname + " <PATH> <IMAGE>" |
341 | print prname + " <PATH> <IMAGE>" |
| 68 | 342 | ||
| 69 | def main(): |
343 | def main(): |
| Line 74... | Line 348... | ||
| 74 | path = os.path.abspath(sys.argv[1]) |
348 | path = os.path.abspath(sys.argv[1]) |
| 75 | if (not os.path.isdir(path)): |
349 | if (not os.path.isdir(path)): |
| 76 | print "<PATH> must be a directory" |
350 | print "<PATH> must be a directory" |
| 77 | return |
351 | return |
| 78 | 352 | ||
| - | 353 | fat16_clusters = 4096 |
|
| - | 354 | min_cluster_size = 1024 |
|
| - | 355 | ||
| - | 356 | sector_size = 512 |
|
| - | 357 | cluster_size = 4096 |
|
| - | 358 | dirent_size = 32 |
|
| - | 359 | fatent_size = 2 |
|
| - | 360 | fat_count = 2 |
|
| - | 361 | reserved_clusters = 2 |
|
| - | 362 | ||
| - | 363 | # Make sure the filesystem is large enought for FAT16 |
|
| - | 364 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
|
| - | 365 | while (size / cluster_size < fat16_clusters): |
|
| - | 366 | if (cluster_size > min_cluster_size): |
|
| - | 367 | cluster_size /= 2 |
|
| - | 368 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
|
| - | 369 | else: |
|
| - | 370 | size = fat16_clusters * cluster_size + reserved_clusters * cluster_size |
|
| - | 371 | ||
| - | 372 | root_size = align_up(root_entries(path) * dirent_size, cluster_size) |
|
| - | 373 | ||
| - | 374 | fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size) |
|
| - | 375 | ||
| - | 376 | sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size |
|
| - | 377 | root_start = cluster_size + fat_count * fat_size |
|
| - | 378 | data_start = root_start + root_size |
|
| - | 379 | ||
| 79 | outf = file(sys.argv[2], "w") |
380 | outf = file(sys.argv[2], "w") |
| 80 | 381 | ||
| 81 | boot_sector = xstruct.create(BOOT_SECTOR) |
382 | boot_sector = xstruct.create(BOOT_SECTOR) |
| 82 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
383 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
| 83 | boot_sector.oem = "MSDOS5.0" |
384 | boot_sector.oem = "MSDOS5.0" |
| 84 | boot_sector.sector = 512 |
385 | boot_sector.sector = sector_size |
| 85 | boot_sector.cluster = 8 # 4096 bytes per cluster |
386 | boot_sector.cluster = cluster_size / sector_size |
| 86 | boot_sector.reserved = 1 |
387 | boot_sector.reserved = cluster_size / sector_size |
| 87 | boot_sector.fats = 2 |
388 | boot_sector.fats = fat_count |
| 88 | boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned |
389 | boot_sector.rootdir = root_size / dirent_size |
| - | 390 | if (sectors <= 65535): |
|
| - | 391 | boot_sector.sectors = sectors |
|
| - | 392 | else: |
|
| 89 | boot_sector.sectors = 0 # FIXME |
393 | boot_sector.sectors = 0 |
| 90 | boot_sector.descriptor = 0xF8 |
394 | boot_sector.descriptor = 0xF8 |
| 91 | boot_sector.fat_sectors = 0 # FIXME |
395 | boot_sector.fat_sectors = fat_size / sector_size |
| 92 | boot_sector.track_sectors = 0 # FIXME |
396 | boot_sector.track_sectors = 63 |
| 93 | boot_sector.heads = 0 # FIXME |
397 | boot_sector.heads = 6 |
| 94 | boot_sector.hidden = 0 |
398 | boot_sector.hidden = 0 |
| - | 399 | if (sectors > 65535): |
|
| - | 400 | boot_sector.sectors_big = sectors |
|
| - | 401 | else: |
|
| 95 | boot_sector.sectors_big = 0 # FIXME |
402 | boot_sector.sectors_big = 0 |
| 96 | 403 | ||
| 97 | boot_sector.drive = 0 |
404 | boot_sector.drive = 0x80 |
| 98 | boot_sector.extboot_signature = 0x29 |
405 | boot_sector.extboot_signature = 0x29 |
| 99 | boot_sector.serial = random.randint(0, 0xFFFFFFFF) |
406 | boot_sector.serial = random.randint(0, 0x7fffffff) |
| 100 | boot_sector.label = "HELENOS" |
407 | boot_sector.label = "HELENOS" |
| 101 | boot_sector.fstype = "FAT16 " |
408 | boot_sector.fstype = "FAT16 " |
| 102 | boot_sector.boot_signature = [0x55, 0xAA] |
409 | boot_sector.boot_signature = [0x55, 0xAA] |
| 103 | 410 | ||
| 104 | outf.write(boot_sector.pack()) |
411 | outf.write(boot_sector.pack()) |
| 105 | 412 | ||
| - | 413 | empty_sector = xstruct.create(EMPTY_SECTOR) |
|
| - | 414 | ||
| - | 415 | # Reserved sectors |
|
| - | 416 | for i in range(1, cluster_size / sector_size): |
|
| - | 417 | outf.write(empty_sector.pack()) |
|
| - | 418 | ||
| - | 419 | # FAT tables |
|
| - | 420 | for i in range(0, fat_count): |
|
| - | 421 | for j in range(0, fat_size / sector_size): |
|
| - | 422 | outf.write(empty_sector.pack()) |
|
| - | 423 | ||
| - | 424 | # Root directory |
|
| - | 425 | for i in range(0, root_size / sector_size): |
|
| - | 426 | outf.write(empty_sector.pack()) |
|
| - | 427 | ||
| - | 428 | # Data |
|
| - | 429 | for i in range(0, size / sector_size): |
|
| - | 430 | outf.write(empty_sector.pack()) |
|
| - | 431 | ||
| - | 432 | fat = array.array('L', [0] * (fat_size / fatent_size)) |
|
| - | 433 | fat[0] = 0xfff8 |
|
| - | 434 | fat[1] = 0xffff |
|
| - | 435 | ||
| - | 436 | recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0) |
|
| - | 437 | ||
| - | 438 | # Store FAT |
|
| - | 439 | fat_entry = xstruct.create(FAT_ENTRY) |
|
| - | 440 | for i in range(0, fat_count): |
|
| - | 441 | outf.seek(cluster_size + i * fat_size) |
|
| - | 442 | for j in range(0, fat_size / fatent_size): |
|
| - | 443 | fat_entry.next = fat[j] |
|
| - | 444 | outf.write(fat_entry.pack()) |
|
| - | 445 | ||
| 106 | outf.close() |
446 | outf.close() |
| 107 | 447 | ||
| 108 | if __name__ == '__main__': |
448 | if __name__ == '__main__': |
| 109 | main() |
449 | main() |