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#52

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What changed
•Improved inline documentation by refining function-level doc comments for clarity and correctness.
•Added a few targeted tests to cover key behaviors and edge cases.
•Minor wording/formatting tweaks to keep documentation style consistent across the codebase.

jackieismpc and others added 12 commits December 18, 2025 21:17
Signed-off-by: jackieismpc <jackieismpc@gmail.com>
Signed-off-by: jackieismpc <jackieismpc@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Quanyi Ma <eli@patch.sh>
Signed-off-by: jackieismpc <jackieismpc@gmail.com>
Signed-off-by: jackieismpc <jackieismpc@gmail.com>
@genedna genedna requested a review from Copilot December 19, 2025 12:26
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genedna commented Dec 19, 2025

@codex review

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Codex Review: Didn't find any major issues. 🎉

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Pull request overview

This PR enhances inline documentation across the delta and zstdelta modules by refining function-level doc comments for improved clarity and consistency. The changes include improved documentation of Git-style delta encoding/decoding operations, added unit tests for low-level utility functions, and translation of Chinese comments to English.

Key changes:

  • Refined doc comments for delta encoding/decoding functions and utilities to be more precise and descriptive
  • Added comprehensive unit tests for utility functions (varint reading, partial int assembly, etc.)
  • Renamed decode_op to encode_op in the encoder for better semantic accuracy
  • Translated Chinese inline comment to English

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 11 comments.

Show a summary per file
File Description
src/zstdelta/mod.rs Added doc comments to helper and test functions describing round-trip behavior and efficiency tests
src/delta/utils.rs Refined doc comments for utility functions and added comprehensive unit tests for varint and partial int operations
src/delta/mod.rs Enhanced function-level doc comments for heuristic and encoding rate functions, added detailed test descriptions
src/delta/errors.rs Updated error messages and added doc comments to error enum variants for better clarity
src/delta/encode/mod.rs Improved doc comments for encoding functions, renamed decode_op to encode_op, translated Chinese comment to English
src/delta/decode/mod.rs Enhanced module and function documentation, added unit tests for round-trip and error handling

Comment on lines +76 to +78
#[test]
/// Should read exactly N bytes into an array.
fn test_read_bytes() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines +105 to +107
#[test]
/// Partial int assembly based on presence bits (little-endian copy offsets).
fn test_read_partial_int() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines 121 to 127
#[test]
/// Heuristic vs accurate rates on small strings and edge cases:
/// - identical buffers => 1.0
/// - minor edits => partial rate between (0.5,1.0)
/// - totally different => low rate
/// - empty/empty => 1.0; empty vs non-empty => 0.0.
fn test_heuristic_encode_rate() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines 159 to 163
#[test]
/// Heuristic rates on large buffers:
/// - completely different large slices should early-stop to 0
/// - partially different large slices: parallel heuristic vs accurate rate should be close.
fn test_heuristic_encode_rate_large_files() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines +103 to +105
#[test]
/// Mismatched base length should return a decoder error.
fn base_size_mismatch_returns_error() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines 162 to 164
#[test]
/// Deterministic round-trip cases (empty, shrink, grow) to ensure zstd delta apply works.
fn test_round_trip_manual() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines 172 to 174
#[test]
/// Efficiency smoke test: random 1MB base with few byte flips should produce a small delta.
fn test_delta_efficiency() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines +84 to +86
#[test]
/// Varint byte: lower 7 bits value, msb indicates continuation.
fn test_read_var_int_byte() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines +96 to +98
#[test]
/// Full varint assembly: two-byte encoding of 300.
fn test_read_size_encoding() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
Comment on lines +91 to +93
#[test]
/// Delta encode + decode should round-trip to the new buffer.
fn round_trip_matches_source() {
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Doc comment is placed after the #[test] attribute instead of before it. In Rust, doc comments should always precede attributes to be properly associated with the item. The doc comment should be moved above the #[test] attribute.

Copilot uses AI. Check for mistakes.
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