From nobody Sat Nov 15 11:56:32 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1594676469; cv=none; d=zohomail.com; s=zohoarc; b=Bo65vA4/wOYW8tzqJOQRxhQk2GBVsrkYKKno51mwqPR77K9Bfuq5CGT6HWain4shJq40ZGOGxoT55X3XeD3/vymtNJLUNceIVJsgnucKjDAu2bTlbAx2BPhJK9bw8eehdLucp9RzgS6rYkBCjZ+k2qny1dDZr9jaA9it+ZG9AOI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1594676469; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=8/9SERp38qKYxdpOgqqXuHSK/voJLwiZ1TiQSse6FDQ=; b=aeFUhznM0LLZEs9j3TnEbY7V0o+u4eoRl8qKchK0+mZTrpco65B4AASP3QuIVAz4D5liZ+prh4y13/pOBNB6conCkZfejntn10NXyxOd0pNCsHUGYdXhcyZpZZijvFAm02+nu8IQKgqzAzNx7BuxYmUgUt3+th0iA1WkJhxFVYE= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1594676469747314.3259514410222; Mon, 13 Jul 2020 14:41:09 -0700 (PDT) Received: from localhost ([::1]:43592 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jv6CC-0001E7-Gg for importer@patchew.org; Mon, 13 Jul 2020 17:41:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40488) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jv684-0002xB-HI; Mon, 13 Jul 2020 17:36:52 -0400 Received: from relay.sw.ru ([185.231.240.75]:52838 helo=relay3.sw.ru) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jv67z-00052D-UR; Mon, 13 Jul 2020 17:36:52 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay3.sw.ru with esmtp (Exim 4.93) (envelope-from ) id 1jv67m-0000E2-8U; Tue, 14 Jul 2020 00:36:34 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH v10 03/10] qcow2_format.py: change Qcow2BitmapExt initialization method Date: Tue, 14 Jul 2020 00:36:36 +0300 Message-Id: <1594676203-436999-4-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1594676203-436999-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1594676203-436999-1-git-send-email-andrey.shinkevich@virtuozzo.com> 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=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay3.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/13 17:36:45 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" There are two ways to initialize a class derived from Qcow2Struct: 1. Pass a block of binary data to the constructor. 2. Pass the file descriptor to allow reading the file from constructor. Let's change the Qcow2BitmapExt initialization method from 1 to 2 to support a scattered reading in the initialization chain. The implementation comes with the patch that follows. Suggested-by: Vladimir Sementsov-Ogievskiy Signed-off-by: Andrey Shinkevich --- tests/qemu-iotests/qcow2_format.py | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_= format.py index 2f3681b..cbaffc4 100644 --- a/tests/qemu-iotests/qcow2_format.py +++ b/tests/qemu-iotests/qcow2_format.py @@ -113,6 +113,11 @@ class Qcow2BitmapExt(Qcow2Struct): ('u64', '{:#x}', 'bitmap_directory_offset') ) =20 + def __init__(self, fd): + super().__init__(fd=3Dfd) + pad =3D (struct.calcsize(self.fmt) + 7) & ~7 + if pad: + fd.seek(pad, 1) =20 QCOW2_EXT_MAGIC_BITMAPS =3D 0x23852875 =20 @@ -161,21 +166,21 @@ class QcowHeaderExtension(Qcow2Struct): else: assert all(v is None for v in (magic, length, data)) super().__init__(fd=3Dfd) - padded =3D (self.length + 7) & ~7 - self.data =3D fd.read(padded) - assert self.data is not None - - data_str =3D self.data[:self.length] - if all(c in string.printable.encode('ascii') for c in data_str): - data_str =3D f"'{ data_str.decode('ascii') }'" - else: - data_str =3D '' - self.data_str =3D data_str + if self.magic =3D=3D QCOW2_EXT_MAGIC_BITMAPS: + self.obj =3D Qcow2BitmapExt(fd=3Dfd) + else: + padded =3D (self.length + 7) & ~7 + self.data =3D fd.read(padded) + assert self.data is not None + self.obj =3D None + data_str =3D self.data[:self.length] + if all(c in string.printable.encode( + 'ascii') for c in data_str): + data_str =3D f"'{ data_str.decode('ascii') }'" + else: + data_str =3D '' + self.data_str =3D data_str =20 - if self.magic =3D=3D QCOW2_EXT_MAGIC_BITMAPS: - self.obj =3D Qcow2BitmapExt(data=3Dself.data) - else: - self.obj =3D None =20 def dump(self): super().dump() --=20 1.8.3.1