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File extracting method based on CDFS file system

A file system and extraction method technology, applied in the direction of digital recording/reproduction, etc., can solve the problem of being unable to read the content of the file

Inactive Publication Date: 2017-09-05
XLY SALVATIONDATA TECHNOLOGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a method for extracting files based on the CDFS file system, which solves the problem that the data recovery tools currently on the market cannot read the contents of files based on the CDFS file system

Method used

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0019] The main process of the method of the present invention is as follows:

[0020] S1 loads the CD storage medium, and reads the contents of the boot sector of the CDFS file system partition;

[0021] According to the content read in S1, S2 parses the total number of sectors of the partition, the number of bytes of the sector, all file information of the partition, the starting address of the directory entry, and the root directory entry information;

[0022] S3 traverses each item in the root directory and reads all directory information of the root directory;

[0023] S4 analyzes the storage address of the file, the creation time of the file, the length of the file content, and the file type information according to the file directory item inform...

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Abstract

The invention discloses a file extracting method based on a CDFS file system, belonging to the field of data recovery. The method comprises the following steps: S1, loading an optical disc storage medium, and reading content of a boot sector of a CDFS file system; S2, parsing the total number of sectors, the number of bytes in the sectors, all file information of partitioning, the start address of directory table entries, and root directory entry information according to the content read in S1; S3, traversing all root directory entries, and reading all directory information of a root directory; and S4, parsing the file storage address, file creation time, file content length and file type information according to the file directory entry information read in S3. The beneficial effects are as follow: through the method, the file storage logic can be parsed quickly according to the structure of the CDFS file system; and a file can be read quickly by only reading the address for recording the content of the file.

Description

technical field [0001] The invention relates to the field of data recovery, in particular to a method for extracting files based on a CDFS file system. Background technique [0002] In recent years, with the rapid development of multimedia computer applications and information industry, CD-ROM storage media such as CD-ROM have developed into the main carrier of computer information data. The optical disc industry is also rapidly expanding into the information data market. According to relevant experts' prediction, CD-ROM will only account for 2% (about 30 million pieces) of the CD market in 1992 and grow to 520 million pieces in 1996. Such rapid growth mainly comes from the following factors. First, CD-ROMs are based on widely accepted international standards and can be mass-produced as cost-effectively and cost-effectively as laser discs. The second favorable factor is that optical disc drives work similarly to compact disc players, resulting in less expensive optical dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10
CPCG11B20/10
Inventor 梁效宁朱星海赵飞张佳强
Owner XLY SALVATIONDATA TECHNOLOGY INC
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