| 411 | } |
| 412 | |
| 413 | bool findCentralDirectory(const uint8_t *data, uint64_t fileSize, uint64_t *cdOffset, uint64_t *totalEntries) |
| 414 | { |
| 415 | if (fileSize < KT_MIN_EOCD_SIZE) |
| 416 | return false; |
| 417 | |
| 418 | uint64_t searchStart = (fileSize > KT_MAX_EOCD_SEARCH) ? fileSize - KT_MAX_EOCD_SEARCH : 0; |
| 419 | |
| 420 | for (int64_t offset = fileSize - 4; offset >= (int64_t)searchStart; --offset) |
| 421 | { |
| 422 | uint32_t sig; |
| 423 | if (!read32(data, fileSize, offset, sig)) |
| 424 | continue; |
| 425 | |
| 426 | if (sig == KT_EOCD_SIGNATURE) |
| 427 | { |
| 428 | uint16_t entries16; |
| 429 | uint32_t cdOff32; |
| 430 | |
| 431 | if (!read16(data, fileSize, offset + 10, entries16)) |
| 432 | return false; |
| 433 | if (!read32(data, fileSize, offset + 16, cdOff32)) |
| 434 | return false; |
| 435 | |
| 436 | if (totalEntries) |
| 437 | *totalEntries = entries16; |
| 438 | |
| 439 | if (cdOffset) |
| 440 | *cdOffset = cdOff32; |
| 441 | |
| 442 | return true; |
| 443 | } |
| 444 | |
| 445 | if (sig == KT_ZIP64_EOCD_LOCATOR) |
| 446 | { |
| 447 | uint64_t zip64EOCDOffset; |
| 448 | if (!read64(data, fileSize, offset + 8, zip64EOCDOffset)) |
| 449 | return false; |
| 450 | |
| 451 | uint32_t zip64sig; |
| 452 | if (!read32(data, fileSize, zip64EOCDOffset, zip64sig)) |
| 453 | return false; |
| 454 | |
| 455 | if (zip64sig != KT_ZIP64_EOCD_SIGNATURE) |
| 456 | return false; |
| 457 | |
| 458 | uint64_t entries64; |
| 459 | uint64_t cdOff64; |
| 460 | |
| 461 | if (!read64(data, fileSize, zip64EOCDOffset + 24, entries64)) |
| 462 | return false; |
| 463 | |
| 464 | if (!read64(data, fileSize, zip64EOCDOffset + 48, cdOff64)) |
| 465 | return false; |
| 466 | |
| 467 | if (totalEntries) |
| 468 | *totalEntries = entries64; |
| 469 | |
| 470 | if (cdOffset) |
no test coverage detected