A method of extracting qcow image files

A technology of mirroring files and header files, applied in file systems, file access structures, instruments, etc., can solve problems such as complex operations, inability to obtain mistakenly deleted data, and inability to obtain multiple user data at the same time, so as to achieve the effect of fast file speed

Active Publication Date: 2022-03-04
SICHUAN QIAODUOTIANGONG PRECISION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3. You need to use tools to open the virtual machine in the qcow image
[0007] 4. Cannot obtain multiple user data at the same time
[0008] 5. Only the data displayed by the current virtual machine can be obtained, and the data deleted by mistake cannot be obtained
[0009] The above operations are complex and require professionals to complete data extraction, which is not conducive to simple, fast and efficient data extraction

Method used

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  • A method of extracting qcow image files
  • A method of extracting qcow image files
  • A method of extracting qcow image files

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Embodiment Construction

[0081] The present invention is further illustrated below in conjunction with the accompanying drawings and embodiments.

[0082] figure 1 Shows a general flow chart of the method of the present invention is provided;

[0083] figure 2 Shows a data structure of the present invention FIG qcow embodiment the image file, including an address and a mapping relationship between a table, the table and two clusters; as figure 2 Shown, image files are in qcow, i.e., cluster (Cluster) constituted by two address storage cluster table is fixed by a plurality of unit structures in the secondary table to manage the address table stored in a table two on a table by the management. To illustrate the method provided in the present application, in the present embodiment, one sector is 512 bytes, as the clusters into figure 2 A plurality of data blocks shown. Acquiring cluster data, need to parse a table, the table information to address two data clusters.

[0084] Such as figure 1 , The method o...

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Abstract

The invention discloses a method for extracting a qcow image file, which is characterized in that it comprises the following steps: S100: search and analyze the header file of the qcow image file in the disk, and obtain header file information; S200: obtain and Analyzing the first-level table, obtaining and analyzing the second-level table according to the result of analyzing the first-level table, and obtaining the cluster address according to the result of analyzing the second-level table; S300: according to the method in step S200, Traverse the first-level table and the second-level table of the qcow image file, obtain cluster data corresponding to each cluster address and sequentially save them as system files; S400: According to the absolute offset of the specified file in the system file address and the size of the specified file, calculate the address of the specified file in the qcow image file, and obtain the content of the specified file.

Description

Technical field [0001] The invention belongs to the field of data recovery, involving a method of extracting QCOW mirroring files. Background technique [0002] The QEMU origin is analog processor, which is open to other analog processors, etc., which uses the advantages of fast, simulated speed, and widely used on the GNU / Linux platform. QCOW is the suffix of its expansion image file. The QCOW file system does not support cavity, with smaller files, support writing, support snapshots, can choose to meet Zlib's compression and AES encryption, QCOW mirroring is wide. [0003] So how do I extract the contents of the mirror file and get the user data in the QCOW mirror file? There are two current mainstream methods: network transmission or use 9PSetup protocol to implement file transfer between virtual machines and hosts, but they exist in the extraction data: [0004] 1. Using the network to perform file extraction, you need to configure the network bridge on the host, start the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/4401G06F16/13
CPCG06F9/4416
Inventor 梁效宁张佳强刘波许超明朱星海
Owner SICHUAN QIAODUOTIANGONG PRECISION EQUIP CO LTD
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