aboutsummaryrefslogtreecommitdiff
path: root/dma-helpers.c
diff options
context:
space:
mode:
authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2016-07-14 19:59:25 +0300
committerMax Reitz <mreitz@redhat.com>2016-07-26 17:46:37 +0200
commitebf7bba090e617fd841177e6ea3de3a129c31a97 (patch)
treecbf9ba9ac0a63e2d3cb290390576db173729001c /dma-helpers.c
parentf49ee630d73729ecaeecf4b38a8df11bc613914d (diff)
qcow2: do not allocate extra memory
There are no needs to allocate more than one cluster, as we set avail_out for deflate to one cluster. Zlib docs (http://www.zlib.net/manual.html) says: "deflate compresses as much data as possible, and stops when the input buffer becomes empty or the output buffer becomes full." So, deflate will not write more than avail_out to output buffer. If there is not enough space in output buffer for compressed data (it may be larger than input data) deflate just returns Z_OK. (if all data is compressed and written to output buffer deflate returns Z_STREAM_END). Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 1468515565-81313-1-git-send-email-vsementsov@virtuozzo.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'dma-helpers.c')
0 files changed, 0 insertions, 0 deletions