tree 1383a33e17d52f6ce3d9b271582993cfe6395f1a
parent 1e5b0101e4ac740b6a0676e18dce3a5b8834cc78
author stuartmorgan <stuartmorgan@google.com> 1626117254 -0700
committer GitHub <noreply@github.com> 1626117254 -0700
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[cross_file] Improve dart:io saveTo (#404)

Changes the `saveTo` method for the dart:io-based implementation to copy
path-based instances rather than read them into memory and writing them
out again. This makes it *much* more efficient, especially for large
files.

Also adjusts the unit tests to write to a temporary directory rather
than in-tree, since they are using the actual filesystem.

Fixes https://github.com/flutter/flutter/issues/83665