pdfjs-dist

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Author	SHA1	Message	Date
Jonas Jenwald	07e1ad40a2	Replace `getAll` with `getKeys` in `PartialEvaluator_hasBlendModes` to speed up loading of badly generated PDF files (issue 6961) Some bad PDF generators, in particular "Scribus PDF", duplicates resources a lot at various levels of the PDF files. This can lead to `PartialEvaluator_hasBlendModes` taking an unreasonable amount of time to complete. The reason is that the current code is using `Dict_getAll`, which recursively dereferences all indirect objects, which can be really slow. This patch instead uses `Dict_getKeys`, and then manually looks up only the necessary indirect objects. I've added the PDF file as a `load` test. The most important thing here is probably to ensure that the file remains available in the repo, and the comment should help reduced the chance of regressions. (Note that locally, the `load` test times out without this patch, but we cannot really assume that that always happens.) Fixes 6961.	9 years ago

Author

SHA1

Message

Date

Jonas Jenwald

07e1ad40a2

Replace `getAll` with `getKeys` in `PartialEvaluator_hasBlendModes` to speed up loading of badly generated PDF files (issue 6961)

Some bad PDF generators, in particular "Scribus PDF", duplicates resources *a lot* at various levels of the PDF files. This can lead to `PartialEvaluator_hasBlendModes` taking an unreasonable amount of time to complete.
The reason is that the current code is using `Dict_getAll`, which recursively dereferences *all* indirect objects, which can be really slow. This patch instead uses `Dict_getKeys`, and then manually looks up only the necessary indirect objects.

I've added the PDF file as a `load` test. The most important thing here is probably to ensure that the file remains available in the repo, and the comment should help reduced the chance of regressions. (Note that locally, the `load` test times out without this patch, but we cannot really assume that that always happens.)

Fixes 6961.

9 years ago

1 Commits (4a74cc418ccb0b14dbbb50e0b964f32a41d16647)