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

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"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>
This commit is contained in:
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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docs/interop/qcow2.txt
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@ -214,14 +214,18 @@ version 2.
type. type.
If the incompatible bit "Compression type" is set: the field 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 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: 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> 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 === === Header padding ===