Nico Weber 93b3f12680 LibPDF: Fix quadratic runtime in stream dumping ...

DeprecatedString::substring() makes a copy of the substring.
Instead, use a StringView, which can make substring views in constant
time.

Reduces time for `pdf --dump-contents image-based-pdf-sample.pdf` to
2.2s (from not completing for 1+ minutes).

That file contains a 221 kB jpeg.

Find it on the internet here:
https://nlsblog.org/wp-content/uploads/2020/06/image-based-pdf-sample.pdf

2023-07-14 09:50:30 -04:00

6.8 KiB

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