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pdftract/notes/pdftract-2cnmr.md
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docs(pdftract-2cnmr): add verification note for PdfSource trait implementation
2026-05-28 03:50:05 -04:00

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pdftract-2cnmr: PdfSource trait + MmapSource + FileSource

Summary

The PdfSource trait abstraction with MmapSource and FileSource implementations was already implemented in the codebase prior to this bead. All core acceptance criteria are met.

Implementation Status

PASS Criteria

  1. PdfSource trait defined and exported ✓

    • Location: crates/pdftract-core/src/source/mod.rs
    • Provides len(), read_range(offset, length), and prefetch() methods
    • Object-safe trait with Read + Seek + Send + Sync bounds for rayon parallelism

  2. MmapSource implementation ✓

    • Location: crates/pdftract-core/src/source/mmap.rs
    • Uses memmap2 = "0.9" for memory-mapped I/O
    • Implements advise_sequential() for MADV_SEQUENTIAL hint
    • Comprehensive test suite (29 tests) covering all operations

  3. FileSource implementation ✓

    • Location: crates/pdftract-core/src/source/file_source.rs
    • Uses parking_lot::Mutex for thread-safe &self access
    • Handles special files (e.g., /proc) that don't support mmap
    • Comprehensive test suite (15 tests)

  4. MemorySource implementation (bonus)

    • Location: crates/pdftract-core/src/source/memory.rs
    • In-memory source for testing with zero-copy Bytes

  5. Exports from lib.rs ✓

    • All source types re-exported from pdftract_core::source
    • Line 90: pub use source::{FileSource, MmapSource, PdfSource};

Dependencies

All required dependencies are present in Cargo.toml:

  • bytes = "1" - Zero-copy slice type
  • memmap2 = "0.9" - Memory mapping
  • parking_lot = "0.12" - Mutex for FileSource

Build Status

  • Lib compilation: PASS - cargo build --package pdftract-core --lib succeeds
  • Test compilation: BLOCKED - Unrelated test errors in markdown.rs (API signature mismatches in test-only code)

The source module itself compiles cleanly. Test compilation errors are in test code for the markdown module (block_to_markdown and page_to_markdown function calls with outdated signatures), which is unrelated to the source abstraction work.

Code Quality

  • All implementations include comprehensive test suites
  • Thread-safe (Send + Sync) for rayon parallelism
  • Proper error handling with io::Result
  • Well-documented with examples and safety notes

INV-8 Verification

INV-8 (Invariants) appears to be maintained:

  • Source abstraction properly abstracts over storage medium
  • Thread safety enforced via trait bounds
  • No assumptions about file mutability (documented as known limitation for mmap)

Files Examined

  1. crates/pdftract-core/src/source/mod.rs - PdfSource trait definition
  2. crates/pdftract-core/src/source/mmap.rs - MmapSource implementation
  3. crates/pdftract-core/src/source/file_source.rs - FileSource implementation
  4. crates/pdftract-core/src/source/memory.rs - MemorySource implementation
  5. crates/pdftract-core/src/lib.rs - Public exports
  6. crates/pdftract-core/Cargo.toml - Dependencies verified

Conclusion

The PdfSource trait and implementations are complete and meet all acceptance criteria. The bead work was already done in a prior commit. No new code changes were required for this bead.