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PiohrunandClaude Opus 5.5
d90cee4669
* fix(render): read each object stream's index once (vendored hayro-syntax patch 22) `XRef::get_with` parsed an object stream's whole index of `objnum offset` pairs again for every object it fetched from that stream, so reading all of a stream of N objects took N² steps. Firefox keeps every object of a page in one stream: the pdf.js corpus file bug1978317.pdf (65,542 objects in one stream) took 37 s to draw and 40 s to extract its text, and was a known timeout in the robustness baseline. The parsed index is now kept per stream, beside the decoded stream data it indexes (`ObjectStreamIndexes`), and never cleared, as that data isn't. A malformed index is remembered as malformed; `/N` or `/First` that can't be read (a reference that can't be followed while another stream loads) is not remembered. An offset past `usize` is malformed instead of wrapping. A poisoned lock is still used: entries are inserted whole. Release build, Linux: bug1978317.pdf draws in 0.5 s (was 37 s) and extracts its text in 1.9 s (was 40 s), and leaves the baseline's known timeouts; 40,000 pages in one stream open in 0.2 s (was 54 s). `raster::tests::objects_in_one_large_object_stream_are_read_in_linear_time` times out at 20 s with the fix reverted and passes in 0.2 s with it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MoEx9Nj8KC4WKDcf5YaokQ * test(render): an object stream offset past usize is malformed, not a panic Review follow-up on #2427. Mutation testing by mtlcl410 found that replacing patch (22)'s `checked_add` in `read_object_stream_index` with a plain `+` survived every test, although in a debug build that `+` panics on the very input it guards against (and wraps in a release build). Their test pins it: it fails with "attempt to add with overflow" under that mutant and passes on this branch. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>