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docs/interop/qcow2.txt: fix description about "zlib" clusters 

"zlib" clusters are actually raw deflate (RFC1951) clusters without
zlib headers.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
Message-Id: <168424874322.11954.1340942046351859521-0@git.sr.ht>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Akihiro Suda 2023-05-16 23:32:27 +09:00 committed by Kevin Wolf
parent d53c89aed1
commit 41f8b63339
1 changed files with 7 additions and 3 deletions
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10
docs/interop/qcow2.txt
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@ -214,14 +214,18 @@ version 2.
type.
If the incompatible bit "Compression type" is set: the field
must be present and non-zero (which means non-zlib
must be present and non-zero (which means non-deflate
compression type). Otherwise, this field must not be present
or must be zero (which means zlib).
or must be zero (which means deflate).
Available compression type values:
0: zlib <https://www.zlib.net/>
0: deflate <https://www.ietf.org/rfc/rfc1951.txt>
1: zstd <http://github.com/facebook/zstd>
The deflate compression type is called "zlib"
<https://www.zlib.net/> in QEMU. However, clusters with the
deflate compression type do not have zlib headers.
=== Header padding ===