pdf_cos 1.4.0

COS object layer for PDF: tokenizer, parser, filters (incl. CCITT, JBIG2, JPEG 2000), xref machinery, encryption, and serializer. Pure Dart, web-ready.

Changelog

1.4.0

• Version bump to keep the dart-pdf package suite aligned at 1.4.0. Low-level parser, writer, filter, and crypto maintenance supports the higher-level editor and document features in this release.

1.3.2

• Version bump to keep the dart-pdf package suite aligned at 1.3.2. No COS API changes since 1.3.1.

1.3.1

• Add ContentStreamSerializer for writing parsed content-stream operations back to PDF syntax, including inline-image (BI/ID/EI) operations.

1.2.3

• Version bump to keep the dart-pdf package suite aligned at 1.2.3. No COS API changes since 1.2.2.

1.2.2

• Version bump to keep the dart-pdf package suite aligned at 1.2.2. No COS API changes since 1.2.1.

1.2.1

• Add a package example for pub.dev scoring.

1.2.0

• Version bump to keep the dart-pdf package suite aligned at 1.2.0. No low-level COS API changes since 1.1.0.

1.1.0

• Performance: a faster content-stream tokenizer. This is the heart of the render-speed work that puts dart-pdf ahead of PDFium on the benchmark corpus.
• Fix: JPEG 2000 tile-part desynchronization, and indexed Lab color palettes now decode correctly.

1.0.0

First stable release. Changes since 0.1.0:

• JBIG2: Huffman-coded symbol dictionaries and text regions, generic refinement regions, and pattern dictionaries with halftone regions.
• JPEG 2000: reset-probabilities (RESET) code-block style support.
• Inline images: correct data-length detection for DCT-filtered streams.

0.1.0

Initial release.

• COS object model: dictionaries, arrays, names, strings, streams, references.
• Lenient tokenizer/parser for real-world PDFs (broken /Length, missing endobj, junk before the header, broken xref chains with object-scan recovery).
• Cross-reference tables and streams; lazy object loading; incremental updates.
• Filters: Flate, LZW, RunLength, ASCIIHex, ASCII85, DCT passthrough, CCITT G3/G4, JBIG2 (embedded profile), JPEG 2000.
• Encryption: RC4, AES-128, AES-256 decryption and encrypt-on-write.
• Crypto primitives for signing/validation: ASN.1, RSA, ECDSA, CMS, X.509 chain verification.
• Content-stream tokenizer and a from-scratch document builder.