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f1f2ed3194
Rework base32.decode() to properly handle all cases per RFC 4648: - Fix error detection order: - Check minimum length first (Invalid_Length) - Check character validity (Invalid_Character) - Check padding and structure (Malformed_Input) - Fix padding validation: - Add required padding length checks (2=6, 4=4, 5=3, 7=1 chars) - Ensure padding only appears at end - Fix handling of unpadded inputs - Fix buffer handling: - Proper output buffer size calculation - Add bounds checking for buffer access - Add proper buffer validation For example: - "M" correctly returns Invalid_Length (too short) - "mzxq====" correctly returns Invalid_Character (lowercase) - "MZXQ=" correctly returns Malformed_Input (wrong padding) - Unpadded input lengths must be multiples of 8 These changes make the decode function fully compliant with RFC 4648 requirements while providing proper error handling.