| 415 | } |
| 416 | |
| 417 | ULONG Compressor::getUnpackedLength(ULONG inLength, const UCHAR* input) |
| 418 | { |
| 419 | /************************************** |
| 420 | * |
| 421 | * Calculate the unpacked length of the input compressed string. |
| 422 | * |
| 423 | **************************************/ |
| 424 | const auto end = input + inLength; |
| 425 | ULONG result = 0; |
| 426 | |
| 427 | while (input < end) |
| 428 | { |
| 429 | const int length = (signed char) *input++; |
| 430 | |
| 431 | if (length < 0) |
| 432 | { |
| 433 | auto zipLength = (unsigned) -length; |
| 434 | |
| 435 | if (length == -1) |
| 436 | { |
| 437 | zipLength = get_short(input); |
| 438 | input += sizeof(USHORT); |
| 439 | } |
| 440 | else if (length == -2) |
| 441 | { |
| 442 | zipLength = get_long(input); |
| 443 | input += sizeof(ULONG); |
| 444 | } |
| 445 | |
| 446 | if (input >= end) |
| 447 | return 0; // decompression error |
| 448 | |
| 449 | input++; |
| 450 | result += zipLength; |
| 451 | } |
| 452 | else |
| 453 | { |
| 454 | result += length; |
| 455 | input += length; |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | return result; |
| 460 | } |
| 461 | |
| 462 | UCHAR* Compressor::unpack(ULONG inLength, const UCHAR* input, |
| 463 | ULONG outLength, UCHAR* output) |