From: Akihiro Suda <akihiro.suda...@hco.ntt.co.jp>
"zlib" clusters are actually raw deflate (RFC1951) clusters without
zlib headers.
Signed-off-by: Akihiro Suda <akihiro.suda...@hco.ntt.co.jp>
Message-Id: <168424874322.11954.134094204635185952...@git.sr.ht>
Reviewed-by: Eric Blake <ebl...@redhat.com>
Reviewed-by: Kevin Wolf <kw...@redhat.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
docs/interop/qcow2.txt | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index f7dc304ff6..e7f036c286 100644
--- a/docs/interop/qcow2.txt
+++ b/docs/interop/qcow2.txt
@@ -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 ===
--
2.40.1
