Directory entry extension method and system suitable for fat32 file system

A file system and extension method technology, applied in the direction of file system, file system function, file access structure, etc., can solve the problem of inability to be used, and achieve the effects of good compatibility, high practical value, and easy portability

Active Publication Date: 2022-06-14
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

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Experimental program
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Embodiment

[0037] as Figure 2 As shown, the front scan flowchart of the present invention, since different operating systems will be differentiated in the implementation of FAT32, for portable storage media such as U disks, it is likely to appear between different operating systems to transfer files, then the directory items that are not expanded by the directory entry, it is necessary to carry out an initial scan and rearrangement, the operation will not affect the storage media Chinese actual data storage, while when the expansion of the directory item, Nor does the generic system recognize the storage media such as directories and files in the FAT32 file system Figure 1 , schematic diagram of the STRUCTURE of the FAT32 file system of the present invention.

[0038]The scanning process: First, an image of the entire catalog item is read from the original storage media and stored in a tree structure, and each catalog item is checked to check whether it has a special mark for extended catalo...

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PUM

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Abstract

The present invention provides a directory item expansion method and system applicable to the FAT32 file system, comprising: scanning the entire disk directory item on the disk medium formatted as the FAT32 file system, rearranging the original directory item to meet the directory item extension Format requirements; after finding the directory entry corresponding to the file name, find the offset of the extended directory entry corresponding to the directory entry in the sector through the unique mapping relationship and the extended directory entry mark, and write the attribute information to be stored into the extension directory entry; through the unique mapping relationship and the extended directory entry mark, the offset in the sector corresponding to the extended directory entry under the directory is found, and the required attribute information is read from the extended directory entry. The invention can be applied in the field of information security, solves the pain point that the FAT32 file system does not support the storage of information security-related attributes, and has high practical value for access control technology in the field of information security.

Description

Technical field [0001] The present invention relates to the field of computer technology, specifically, to a directory item extension method and system suitable for FAT32 file system. Background [0002] FAT32 refers to the file allocation table using 32-bit binary number records to manage the disk file management method, because the core of the FAT file system is the file allocation table, hence the name. The advantages of the FAT32 file system are good stability and compatibility, and easy maintenance, and the disadvantage is poor security. Since the file directory entry used to record file attribute information in the FAT32 file system specifies the use of 32-bit binary numbers to store file names, file creation time, file classification attributes, file cluster numbers, and file length in the common implementation, it is impossible to store more attribute information, such as the user to which the file belongs, the group to which the file belongs, the file read and write attr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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