9a3e4ce514
Add structures and functions to record inline images (BI/ID/EI sequences) as ImageXObject entries in a page's image list. This enables Phase 4.4 figure detection to correctly classify blocks containing only images. Changes: - Add InlineImageHeader struct for inline image metadata - Add ImageBytesRef enum for image byte references - Add ImageXObject struct unifying XObject and inline images - Add collect_image_xobjects() to collect all images with bboxes - Add parse_inline_image() to parse BI/ID/EI sequences - Add compute_unit_square_bbox() for bbox computation from CTM - Add comprehensive unit tests for all acceptance criteria Acceptance criteria: - Inline image with no CTM: bbox == [0,0,1,1] ✅ - Inline image with CTM 100 0 0 50 200 300: bbox == [200,300,300,350] ✅ - Page with 3 images: page_image_list has 3 entries with correct bboxes ✅ - Image mask: recorded with is_mask flag ✅ - Rotation normalization: handled via CTM ✅ Closes: pdftract-axcri |
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| .. | ||
| benches | ||
| build | ||
| examples | ||
| proptest-regressions/parser/lexer | ||
| src | ||
| tests | ||
| __test__.pdf | ||
| build.rs | ||
| Cargo.toml | ||
| pdftract-core.cdx.json | ||
| README.md | ||
pdftract-core
The core Rust library for PDF text extraction. This crate provides the parsing, layout analysis, font encoding recovery, and text extraction primitives used by the CLI (pdftract-cli) and Python bindings (pdftract-py).
Cargo.lock Policy
This workspace checks in Cargo.lock at the repository root. This is unconventional for library crates—the Cargo Book historically suggested that only binary crates should check in lockfiles, allowing library consumers to resolve their own dependency versions.
pdftract departs from this convention for release reproducibility:
-
SLSA Level 3 provenance requires that every milestone tag produces byte-identical artifacts across builds. Without a checked-in lockfile, two runs of
cargo buildon the same commit can resolve different transitive dependency versions, producing different binary hashes. -
Multi-output artifacts—this workspace produces Rust crates (
pdftract-core,pdftract-cli), Python wheels (pdftract-py), and Docker images. All must be built from the same dependency tree. -
Supply-chain security—the lockfile pins checksums for all transitive dependencies, enabling
cargo auditto detect yanked or compromised crates. -
Downstream consumers can still ignore the lockfile if needed. Cargo allows
cargo build --frozenwith a local lockfile override, or consumers can vendor the crate with their own dependency resolution.
The tradeoff—occasional merge conflicts when PRs update overlapping dependencies—is worth the guarantee of reproducible releases. See CONTRIBUTING.md for the lockfile-update workflow.
Modules
parser: PDF spec parsing (xref, trailer, object streams, indirect references)font: Font encoding recovery, glyph name lookup, fingerprintinglayout: Page layout analysis, region segmentation, reading orderextract: Text extraction with provenance (bounding boxes, confidence scores)ocr: Tesseract integration for raster pages
Usage
use pdftract_core::{extract_text, ExtractOptions};
let options = ExtractOptions::default();
let result = extract_text("document.pdf", &options)?;
println!("{}", result.text);