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bh=zstI19rKVNa+kdrsTIs7vlvr1F7iq82cM+TZD7FBpS8=; b=BeLH7y8LoceW1UsWJvhHfdLTb4yHsfis26UI1j79vXVX859pwAX3exlj806MZV3H9+LV+Q YxGjBmaKv3t5RPfyOlOrJAqELUvjMehiszboVgfhf8XSEuP4HZdM86VU5vtJlmm4719mZi j2+XSceEXsdnQ5jC1TPiozTEHgfmt5U= X-MC-Unique: 3iiP3wSYMvi2nMagyPFIJA-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org Subject: [PULL 07/18] docs/interop/qcow2.txt: fix description about "zlib" clusters Date: Wed, 17 May 2023 18:51:05 +0200 Message-Id: <20230517165116.475123-8-kwolf@redhat.com> In-Reply-To: <20230517165116.475123-1-kwolf@redhat.com> References: <20230517165116.475123-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1684342441303100007 Content-Type: text/plain; charset="utf-8" From: Akihiro Suda "zlib" clusters are actually raw deflate (RFC1951) clusters without zlib headers. Signed-off-by: Akihiro Suda Message-Id: <168424874322.11954.1340942046351859521-0@git.sr.ht> Reviewed-by: Eric Blake Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- 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. =20 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 p= resent - or must be zero (which means zlib). + or must be zero (which means deflate). =20 Available compression type values: - 0: zlib + 0: deflate 1: zstd =20 + The deflate compression type is called "zlib" + in QEMU. However, clusters wit= h the + deflate compression type do not have zlib headers. + =20 =3D=3D=3D Header padding =3D=3D=3D =20 --=20 2.40.1