Massively speed up low-level SFTP read/write

This doesn't impact most users who perform reads/writes using
SFTPClient.get(fo)/put(fo) as those naturally perform chunking. However,
users accessing the raw SFTPFile objects via SFTPClient.open() and then
reading/writing large (more than a few MB) files, may experience severe
slowdown due to inefficient slicing of the file being read/written.

This change replaces the naive "slice a list of bytes" code with
bytearray and memoryview, which are significantly more performant in
these use cases, while remaining backwards compatible.

Patch courtesy of Sevastian Tchernov.

0 files changed, 0 insertions, 0 deletions