tree 30dd54806bd07fd59c8f6a14b67a16ea5160e931
parent 1980ad66aa90982006214d33cf943d4d21ca164f
author Gianfranco Valentino <gevalentino@google.com> 1618345421 +0000
committer CQ Bot <commit-bot@chromium.org> 1618345421 +0000

[volume_image]: Lz4DecompressReader.

Allows streaming a compressed sparse image without decompressing
entirely beforehand.

Fixed decompression where, the decompressor would resize its internal
buffer to match whatever size the hint requested. This is wrong, since
it would break expected bounds. That aside, the internal decompressor
has its own decompressor buffers, aligned to the compression blocks.

Removed harmlesss incorrect behavior. Decompressing a compressed sparse
fvm flag, would remove the no fill required flag from the header. This
is not correct, since when a compressed image is generated, all zeroes
are emitted, and left for the compressor to reduce the space. This was
harmless because it just resulted in more zeroes being written when
writing a decompressed sparse image.

Update default constructor for Lz4Compressor, to set the default
arguments for the LZ4_preferences_t required to compress.

Test: storage-volume-image-test
Change-Id: Ibeb0bec400f722a47d036e581e4586fd48bfc04d
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/513512
Reviewed-by: James Sullivan <jfsulliv@google.com>
Commit-Queue: Gianfranco Valentino <gevalentino@google.com>