tree 2d552bbcb16bc9baf883df6e060590e1e46c9c2c
parent 994c2b17e5bf2bc07b9b183d91bb7f19c2fb0932
author Tom Sepez <tsepez@google.com> 1790819057 -0700
committer pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1790819057 -0700

Use copy-on-write instead of const_cast in RustJpegScanlineDecoder

Avoid mutating the input span in-place with const_cast in
RustJpegScanlineDecoder. Make a copy of the input source data into a
vector on demand when patching is required, matching the behavior
of LibjpegScanlineDecoder.

Change-Id: I0ead4a23f95ce24518ebec1da07e52e279bc9302
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/159270
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>