Fix memory handling throughout base32 package:
- Make padding map package-level constant (to avoid repeated allocs)
- Use passed allocator in encode's make() call
- Add defer delete for allocated memory in encode
- Add proper cleanup in test cases
- Fix memory cleanup of output buffers
The changes ensure consistent allocator usage and cleanup in both
implementation and tests.
Add test suite based on RFC 4648 test vectors and validation rules:
- Add section 10 test vectors for valid encoding/decoding
- Add test cases for invalid character handling (section 3.2)
- Add test cases for padding validation (section 4)
- Add test cases for length requirements (section 6)
The test vectors verify that:
- Empty string encodes/decodes correctly
- Standard cases like "foo" -> "MZXW6===" work
- Invalid characters are rejected
- Missing or malformed padding is detected
- Invalid lengths are caught
Fix buffer allocation size calculation and add proper bounds checking to
ensure output buffer has sufficient space. This fixes crashes that could
occur with inputs like "AA" and other edge cases where the output buffer
was too small.
Remove #no_bounds_check as proper bounds checking is necessary for safe
error handling. The small performance trade-off is worth the improved
robustness.
Replace assertions with proper error handling in base32.decode() to allow
programs to handle invalid input gracefully rather than crashing.
The function now returns ([]byte, Error) instead of just []byte.
