mirror of
https://github.com/storytold/vectorcraft.git
synced 2026-10-24 17:56:50 -06:00
Taha-Mahmoodi
1ec46732b8
Review of #3919: the scan raised its walk-back floor at every `>>stream`, so one inside a literal string moved the floor past the `<<` of the cross-reference stream around it, and that stream was never looked at. The backward walk also counted a `>>` inside a string, and missed a comment between `>>` and `stream`. The scan now reads the file forward once, as the reader does: literal strings (nested, escaped), hex strings and comments are skipped, `<<` and `>>` pair on a stack, and a dictionary followed by `stream` is a stream's, whose data is skipped. Because the reader can still start at a `<<` inside skipped text (a cross-reference offset or its repair scan), each such `<<` is read as a dictionary of its own, up to 64 KiB, within a budget of four times the file plus 1 MiB; a crafted file that spends it is refused. The scan stays linear.