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gigapdf-lib v0.70.0

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@github-actions github-actions released this 23 Jun 16:30
· 111 commits to main since this release
v0.70.0
a199811

Fidelity + standards release: advanced (PAdES-B-T) timestamped signatures,
richer shading and JPEG decoding at the rasteriser, complex-script text shaping
for Indic writing systems, CFF flex curves, and RTF image import. The public API
is additive — existing behaviour is unchanged.

Added

  • PAdES-B-T trusted timestamps (RFC 3161). New SDK
    GigaPdfDoc.signTimestamped() (async) embeds an RFC 3161 timestamp token in
    the SignerInfo for an advanced-level PAdES-B-T signature — ETSI.CAdES.detached
    subfilter, signing-certificate-v2 (ESS) signed attribute, and the
    id-aa-timeStampToken unsigned attribute. Uses the engine's pure-data
    two-phase TSA flow (core emits the TimeStampReq, host POSTs it, core embeds
    the returned token) since the WASM core has no network stack; tsaFetch lets
    the host add auth/proxy/retries and apply its own SSRF allow-list, and the
    exported defaultTsaPost POSTs application/timestamp-query via fetch
    (e.g. FreeTSA). Signs with an imported PKCS#12 or a freshly generated
    self-signed identity.
  • Mesh shadings at the rasteriser. Free-form (type 4), lattice (type 5),
    Coons (type 6) and tensor (type 7) shadings are now rendered as Gouraud
    triangles (pure, zero-dep decoder; Coons/tensor patches tessellated per
    ISO 32000-1 §8.7.4.5.7), with per-vertex colour resolved through
    Separation/DeviceN/ICCBased/CMYK/Gray. Axial (2) and radial (3)
    shadings are unchanged.
  • Arithmetic-coded JPEG decoding. SOF9 (sequential) and SOF10 (progressive)
    JPEGs now decode via a hand-rolled ISO/IEC 10918-1 Annex MQ arithmetic decoder
    with the F.1.4 DC/AC context models and DAC conditioning. Baseline/Huffman
    paths are unchanged; lossless (SOF3/SOF11) and 12-bit Huffman (SOF1) remain
    gracefully unsupported.
  • Indic complex-script shaping. A syllabic reordering machine for the
    Brahmi-derived scripts (Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil,
    Telugu, Kannada, Malayalam) — reph and pre-base matra reordering — plus the
    missing OpenType lookups: GSUB 2 (multiple), GSUB 3 (alternate), GSUB 8
    (reverse chaining single) and GPOS 3 (cursive attachment). Latin and the
    existing contextual paths are unchanged.
  • CFF/Type2 flex operators. The Type2 charstring interpreter now implements
    the four flex operators (flex, flex1, hflex, hflex1, Adobe TN #5177),
    each emitting two cubic curves — CFF glyphs using flex no longer drop or
    mis-render contour segments.
  • RTF image import. RTF import parses the \pict group, extracting
    \pngblip/\jpegblip payloads as <img src="data:image/…;base64,…">
    (display size recovered from \picwgoal/\pichgoal), reusing the HTML
    engine's image-embed pipeline. DIB/BMP, WMF/EMF and binary \bin payloads are
    skipped (documented limits), guarded by a PNG/JPEG magic-byte check.
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