Nika Layzell 10e86924f0 Bug 1706374 - Part 14: Track the absolute offset on iterators, r=glandium
This should improve the performance of large calls to AdvanceAcrossSegments
when using a very large BufferList, as we no longer need to iterate over each
element to find the destination when the call is closer to the end.

This will be used most frequently with the new footer code to seek to the end
of an IPC message to read out the footer.

Differential Revision: https://phabricator.services.mozilla.com/D116667
2021-06-22 18:17:23 +00:00

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