Walkthrough

The pull request modifies the merge_diff_copy function in src/diff/algorithm.rs to return a mutable slice of unwritten trailing bytes instead of unit type, enforcing that destination length equals diffset.changed_len(). It also adds a new InfallibleError variant to the DlpError enum in src/error.rs.

Changes

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Focus areas requiring extra attention:
  • Complex branching logic in merge_diff_copy for handling destination length validation and shrink/expand scenarios
  • Correctness of unwritten trailing byte calculation and slice return semantics
  • Test coverage for edge cases in expanded/shrunk account data scenarios, particularly the TODO note regarding future optimization

Possibly related PRs

• feat: Optimize CommitDiff using efficient merge_diff_copy that avoids heap allocation  #113: Directly modifies the same merge_diff_copy implementation and updates error enum variants
• feat: Add diff module that provides compute_diff, apply_diff_*, DiffSet #111: Implements related diff-apply functionality in the same module (src/diff/algorithm.rs), adding apply_diff_copy and DiffSet which interact with the modified merge_diff_copy function

Suggested reviewers

• GabrielePicco

Pre-merge checks and finishing touches

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• feat: Add CommitDiffFromBuffer ix #118
• feat: Handle account shrinking/expansion in merge_diff_copy #116 👈 (View in Graphite)
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