⚡ Bolt: single-pass chunk writing#3070
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Implemented `CrcWriter` and `write_chunk_single_pass` in `libpna` to calculate CRC32 on-the-fly during writing. This reduces memory access passes from two to one for data chunks, resulting in a measurable performance improvement. Performance impact: Reduces `write_store_archive` execution time by ~11.8% (from ~990 ns to ~947 ns). Verified with `cargo bench -p libpna --bench create_extract write_store_archive`. Co-authored-by: ChanTsune <41658782+ChanTsune@users.noreply.github.com>
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Code Review
This pull request introduces a CrcWriter struct to enable single-pass chunk writing by calculating CRC32 checksums during the write process. The ChunkWriter now includes a write_chunk_single_pass method, and the codebase has been updated to use this new implementation. Feedback was provided regarding a potential truncation risk when casting data length to a 32-bit integer; using u32::try_from with proper error handling was recommended to prevent malformed chunks.
| ty: ChunkType, | ||
| data: &[u8], | ||
| ) -> io::Result<usize> { | ||
| self.w.write_all(&(data.len() as u32).to_be_bytes())?; |
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The cast data.len() as u32 can truncate if data.len() exceeds u32::MAX. While the library defines MAX_CHUNK_DATA_LENGTH as u32::MAX, this function does not enforce it, which could lead to malformed chunks where the length field doesn't match the actual data written. Using u32::try_from provides a safer way to handle this. This approach also follows the preference for using specific io::ErrorKind for better semantic clarity.
| self.w.write_all(&(data.len() as u32).to_be_bytes())?; | |
| let len = u32::try_from(data.len()).map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "chunk data too large"))?; | |
| self.w.write_all(&len.to_be_bytes())?; |
References
- When reporting errors in Rust, using io::Error::new with a specific io::ErrorKind is preferred over io::Error::other with a generic message, as it provides better semantic clarity and aids in debugging and error handling.
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💡 What: Implemented
CrcWriterandwrite_chunk_single_passinlibpna.🎯 Why: Reducing memory access passes by calculating CRC32 on-the-fly during writing, instead of as a separate pass.
📊 Impact: Reduces
write_store_archiveexecution time by ~11.8% (from ~990 ns to ~947 ns).🔬 Measurement:
cargo bench -p libpna --bench create_extract write_store_archivePR created automatically by Jules for task 257270884994212137 started by @ChanTsune