Dylan M. Taylor
c6d5c62d5a
* PSD: bounded zip errors, budgeted prediction row, row-bounded PackBits, channel checks before the result A failed inflate was formatted with Debug, which prints the whole partial output; only the status is kept. The 32-bit ZIP prediction scratch row was allocated outside the decode budget; it is charged now. PackBits packets were appended whole even past the row's end, growing the reserved plane; they are cut at the row. The composite and layer decodes allocated the document-sized result before checking that the channel data exists; the compression and raw/RLE lengths are checked first. * address review: check short ZIP composite data and the layer mask channel before allocating the result * address review: drop the channel prechecks that rejected PSDs the lenient decode accepts; keep the allocation bounds
effectcraft-psd
Reads Photoshop documents (.psd, and .psb large documents) for File ▸ Import (as footage, as a
composition, or as a composition with layer sizes retained), and writes a minimal subset (used to
generate test fixtures).
Implemented from Adobe's public Adobe Photoshop File Formats Specification (November 2019
edition): file header, colour mode data, image resources, layer and mask information (layer
records, channel image data, layer mask data, additional layer information: luni, lsct/lsdk,
lyid, iOpa, TySh, lfx2, SoCo, nvrt, brit, hue2, levl, expA, vmsk/vsms,
Lr16/Lr32, smart objects: SoLd/SoLE/PlLd placement and lnk2/lnkD/lnk3/lnkE
linked layer data with embedded files), the descriptor (action) structure, and the merged image data. Raw, RLE (PackBits)
and ZIP (with and without prediction, inflated with miniz_oxide) compression; 1/8/16/32-bit;
Bitmap, Grayscale, Indexed, RGB, CMYK (naive conversion) and Lab colour modes.
Text engine data (EngineData) is read best-effort for the font, size, fill colour and
justification of the first style run. Smart objects import as footage of their embedded file
(a Photoshop document's merged image, or an image) placed by the smart object's corner quad
(position, scale, rotation). A non-affine quad (nonAffineTransform: perspective) or a placed
layer warp (warp: the named styles with bend and horizontal / vertical distortion, and custom
envelope warps whose quilt mesh of bicubic Bezier patches is read from meshPoints (ObAr)
and quiltSliceX / quiltSliceY) is baked as placed over the placed bounds, at up to 4x the
document resolution (placed). Custom meshes are evaluated exactly; the
named styles' curves are not published, so they are clean-room geometric definitions matching
each style by behaviour. Externally linked files
fall back to the layer's rendered pixels. No Adobe code, sample files or assets were used; test
fixtures are generated in-test by the writer in this crate (write).