Method for reasonably using file space of smart card

A file space and smart card technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve the problems of inconvenient production costs in the production process, and achieve the effect of easy distribution and integration

Inactive Publication Date: 2010-06-23
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Among the various cards, smart card products have been widely used in e-commerce, e-government and other fields; the current smart card products often need to adjust their file systems in response to different stages in the application process. Cards have to be re-issued or re-purchased, which will bring great inconvenience to both the production process and production costs. Under such circumstances, it is particularly urgent to develop file deletion and space recovery functions on inherent products.

Method used

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  • Method for reasonably using file space of smart card
  • Method for reasonably using file space of smart card

Examples

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Embodiment Construction

[0005] The specific embodiment of the present invention is described below in conjunction with accompanying drawing:

[0006] 1. To delete a file, change the original file type to a deleted file type, change the file header to 7 bytes, adjust the file space to remove the remaining space of 7 bytes, and determine whether the adjacent file is a deleted file, if yes , consolidated into one deleted file. If the last file is deleted, directly modify the effective length of the directory space; check the input parameters, find the file to be deleted, determine whether the deletion permission is satisfied, and calculate the length of the deleted file; determine whether to delete the last file, integrate the deleted file; write delete File header.

[0007] 2. Statistical directory space When processing files of the deleted file type, the file header and file space of the deleted file will be counted into the remaining effective space;

[0008] 3. When creating a new file, traverse f...

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PUM

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Abstract

A method for reasonably using file space is provided by using file deletion and space recovery mechanism of smart card and the method mainly comprises the steps of deleting files and arranging directory or card space. The aims of the method are to delete redundant files, arrange fragment space, support the client to adjust the current file system and adapt to different application demands.

Description

technical field [0001] The invention is a method for rationally utilizing file space, and mainly relates to the field of embedded system development. Background technique [0002] Among the various cards, smart card products have been widely used in e-commerce, e-government and other fields; the current smart card products often need to adjust their file systems in response to different stages in the application process. Cards have to be re-issued or re-purchased, which will bring great inconvenience to both the production process and production costs. Under such circumstances, it is particularly urgent to develop file deletion and space recovery functions on inherent products. Contents of the invention [0003] A method for rationally utilizing the file space of the smart card disclosed in the present invention enables customers to adjust their file system according to their own application needs, delete redundant files in applications, and delete DDF, ADF, transparent fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 刘佳
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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