An Illustrator EPS (version 9 on) carries the document as the app keeps
it after its printed page (%AI9_PrivateDataBegin: Zstandard or zlib data
in ASCII85 comment lines, or plain), and a .ai file in its first page's
/PieceInfo /Illustrator /Private streams (%AI24_ZStandard_Data,
%AI12_CompressedData or plain, after header comments). Both now open from
it: layers and sublayers (name, order, visibility, lock, printing,
preview, dimming, colour), groups as they were nested, compound paths,
clipping groups and layer clipping, object names, hidden and locked
objects, fills and strokes (grey, CMYK, RGB, spot colours as spot
swatches, caps, joins, dashes, fill rule), linear and radial gradients,
opacity, blend modes, isolation and knockout, embedded images with their
alpha channel, guides and every artboard where it is.
Objects with several fills or strokes, effects or brushes come in as
their drawn look, named after them, with a warning. Type, symbols,
pattern fills, placed files and operators the reader doesn't know are
errors: the file opens as before (the EPS page, the .ai file's PDF
content) with a first warning saying what was left out. A .ai opened with
pages picked, and a .pdf, read the PDF as before.
Reading is bounded (512 MB decompressed, nesting, objects, points, stack,
image sizes checked against their data) and fuzzed in import_fuzz.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
4550b89051