feat: introduce golomb-rice encoding package #564
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This adds a new package 'pkg/golomb' containing generic Golomb-Rice encoding and decoding logic. The package includes a BitWriter and BitReader for bit-level I/O, as well as an Encoder and Decoder for numerical values (both uint64 and big.Int). This logic was previously embedded within 'pkg/nixcacheindex' but is now extracted into its own package to improve reusability and maintain a cleaner separation of concerns.
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Summary of ChangesHello @kalbasit, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request establishes a new Highlights
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Code Review
This pull request successfully extracts Golomb-Rice encoding logic into a new, reusable package pkg/golomb. The implementation is clean and includes support for both uint64 and big.Int values, along with comprehensive tests. My review focuses on improving the performance of the big.Int handling, which can be significantly slow for large numbers in its current form. I've also suggested a minor improvement in the test suite to ensure all potential errors are caught. Overall, this is a great addition that improves modularity.
This commit addresses performance concerns raised in PR 564. Changes: - Optimizes `EncodeBig` and `DecodeBig` in `pkg/golomb` to use `uint64` arithmetic for quotient operations when possible, avoiding expensive `big.Int` allocations and operations for common cases. - Updates `pkg/golomb/golomb_test.go` to properly handle errors from `Flush()`. This significantly reduces the overhead of Golomb coding for standard integer sizes while maintaining correctness for arbitrarily large numbers. Follow-up on #564 that I merged prematurely by accident.
This adds a new package 'pkg/golomb' containing generic Golomb-Rice encoding and decoding logic. The package includes a BitWriter and BitReader for bit-level I/O, as well as an Encoder and Decoder for numerical values (both uint64 and big.Int).
This logic was previously embedded within 'pkg/nixcacheindex' but is now extracted into its own package to improve reusability and maintain a cleaner separation of concerns.