| 1 | 1 | def encode(numbers: list[int]) -> list[int]: |
| 2 | | pass |
| 2 | result = [] |
| 3 | for number in numbers: |
| 4 | if number < 0 or number > 0xFFFFFFFF: |
| 5 | raise ValueError("number out of range") |
| 6 | |
| 7 | # Edge Case: Zero value encoding |
| 8 | if number == 0: |
| 9 | result.append(0) |
| 10 | continue |
| 11 | |
| 12 | # Convert number to VLQ format |
| 13 | bytes_list = [] |
| 14 | while number > 0: |
| 15 | # Take the 7 least significant bits |
| 16 | byte = number & 0x7F |
| 17 | number >>= 7 |
| 18 | bytes_list.append(byte) |
| 19 | |
| 20 | # Reverse to get most significant byte first |
| 21 | bytes_list.reverse() |
| 22 | |
| 23 | # Set continuation bit for all but the last byte |
| 24 | for i in range(len(bytes_list) - 1): |
| 25 | bytes_list[i] |= 0x80 |
| 26 | |
| 27 | result.extend(bytes_list) |
| 28 | |
| 29 | return result |
| 30 | # Handled Edge Cases: zero value encoding, maximum 32-bit integer value, empty input sequences |
| 3 | 31 | |
| 4 | 32 | |
| 5 | 33 | def decode(bytes_: list[int]) -> list[int]: |
| 6 | | pass |
| 34 | result = [] |
| 35 | number = 0 |
| 36 | |
| 37 | # Edge Case: Empty input sequence |
| 38 | if not bytes_: |
| 39 | return result |
| 40 | |
| 41 | for byte in bytes_: |
| 42 | # Edge Case: Invalid byte value (greater than 255) |
| 43 | if byte < 0 or byte > 255: |
| 44 | raise ValueError("invalid byte") |
| 45 | |
| 46 | # Add the 7 significant bits to our number |
| 47 | number = (number << 7) | (byte & 0x7F) |
| 48 | |
| 49 | # If this is the last byte in the sequence |
| 50 | if (byte & 0x80) == 0: |
| 51 | # Edge Case: Number exceeds 32-bit unsigned integer |
| 52 | if number > 0xFFFFFFFF: |
| 53 | raise ValueError("number too large") |
| 54 | result.append(number) |
| 55 | number = 0 |
| 56 | |
| 57 | # Edge Case: Incomplete byte sequence (last byte missing continuation marker) |
| 58 | if number != 0: |
| 59 | raise ValueError("incomplete sequence") |
| 60 | |
| 61 | return result |
| 62 | # Handled Edge Cases: incomplete byte sequences during decoding, empty input sequences, maximum 32-bit integer value, invalid byte values, number exceeds 32-bit unsigned integer |