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Directory entry extension method and system suitable for FAT32 file system

A technology of file system and extension method, applied in the direction of file system, file system function, file access structure, etc., can solve problems such as being unusable, and achieve the effects of good compatibility, high practical value, and easy portability

Active Publication Date: 2021-05-14
上海华元创信软件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, almost no operating system uses the FAT32 file system to store security attribute information, so it cannot be used in systems with higher information security levels

Method used

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  • Directory entry extension method and system suitable for FAT32 file system
  • Directory entry extension method and system suitable for FAT32 file system
  • Directory entry extension method and system suitable for FAT32 file system

Examples

Experimental program
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Embodiment

[0037] Such as figure 2 As shown, it is the pre-scan flow chart of the present invention, because different operating systems will have differences in the realization of FAT32, for portable storage media such as U disks, it is likely to occur between different operating systems to transfer files, so the unperformed The directory entry expanded by the directory item needs to be initially scanned and rearranged. This operation will not affect the storage of the actual data of the file in the storage medium. At the same time, after the directory entry is expanded, the general system will not recognize the FAT32 file in the storage medium. Directories and files in the system, such as figure 1 , is a schematic structural diagram of the FAT32 file system of the present invention.

[0038] Scanning process: first read the image of the entire directory item from the original storage medium and store it in a tree structure, and check whether each directory item has a special mark for...

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PUM

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Abstract

The invention provides a directory entry extension method and system suitable for an FAT32 file system, and the method comprises the steps: carrying out the full-disk directory entry scanning of a disk medium formatted as the FAT32 file system, and rearranging original directory entries to meet the format requirements of directory entry extension; after the directory entry corresponding to the file name is found, finding out the offset of the extended directory entry corresponding to the directory entry in the sector through the unique mapping relation and the extended directory entry mark, and writing attribute information needing to be stored into the extended directory entry; and finding out the offset of the extended directory entry corresponding to the directory in the sector through the unique mapping relation and the extended directory entry mark, and reading the required attribute information from the extended directory entry. The method and system can be applied to the field of information security, solves the problem that an FAT32 file system does not support storage of information security related attributes, and have high practical value for an access control technology in the field of information security.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a directory item extension method and system applicable to the FAT32 file system. Background technique [0002] FAT32 refers to the disk file management method in which the file allocation table adopts 32-bit binary number record management. Because the core of the FAT file system is the file allocation table, the name comes from this. The advantages of the FAT32 file system are good stability and compatibility, and easy maintenance, but the disadvantage is poor security. Since the file directory item used by the FAT32 file system to record file attribute information stipulates that 32-bit binary numbers are used to store the file name, file creation time, file classification attribute, file cluster number, and file length in the general implementation, no more attributes can be stored. Information, such as the user to which the file belongs, the group to which the fil...

Claims

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Application Information

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IPC IPC(8): G06F16/13G06F16/17
CPCG06F16/13G06F16/17
Inventor 俞航钱晨佘庆
Owner 上海华元创信软件有限公司
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