File memory and read method of smart card and device thereof

A technology for file storage and file reading, which is applied in the field of data processing and can solve the problems of cumbersome file deletion and processing

Inactive Publication Date: 2009-11-04
BEIJING WATCH DATA SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In order to solve the cumbersome problem of file deletion in the smart card, an embodiment of the present invention provides a file storage method for the smart card, including:

Method used

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  • File memory and read method of smart card and device thereof
  • File memory and read method of smart card and device thereof
  • File memory and read method of smart card and device thereof

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Embodiment Construction

[0053] In order to solve the problem of re-establishing the relationship between existing files after the files in the smart card are deleted, the first embodiment provided by the present invention is a file storage method of a smart card. First, the file system in this embodiment will be described. The file system in this embodiment adopts a 32-bit COS file system, including a file interface layer and three functional layers: a driver layer, a file storage management layer, and a FLASH conversion layer. The file interface is used to exchange information with the outside world, read, write, and erase files in the smart card. The driver layer implements the drive for operations such as reading, writing, and erasing specific Flash (used as a storage space in this embodiment), and is a collection of Flash operating attributes.

[0054] The FLASH conversion layer mainly realizes the advanced interactive function between the driver layer and the file system storage management layer...

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Abstract

The invention discloses a file memory method and read method of a smart card and a device thereof. The invention discloses a file memory method of a smart card aiming at solving the problem that file deleting process in the smart card is trivial, including: basic file headers in the headers of a file to be stored in the same dedicated file DF file body are stored in sequence structure, wherein the basic file headers contain file identification information and initial address message of expanding file header in the file header and occupies a fixed storage space; the expanding file header is stored according to the initial address message of the expanding file header; the file body is stored according to file body storage address relevant information in the file header, connection between the current file and the file to be deleted is not required to be rebuilt as each basic file header or file header occupies a fixed storage space, thus simplifying file deleting process.

Description

technical field [0001] The invention belongs to the field of data processing, in particular to a file storage and reading method and device of a smart card. Background technique [0002] The structure of the smart card file system has been specified in the ISO / IEC 7816-4 standard. In the smart card, the smart card uses a standardized file structure. It does not contain application-specific files, such as those for specific file processors. [0003] The files of the smart card are basically divided into two categories: the first category is the directory file, which is called "dedicated file" DF (Dedicated File), and the second category is the file with practical data, which is called "Elementary File" EF (Elementary File). A Dedicated File (DF) can be seen as a file box containing EFs or sub-DFs (other lower-level DFs that logically belong together with EFs). [0004] For any file, there are two forms of structure: the logical structure of the file and the physical struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06K19/07
Inventor 张楠杨贵龙
Owner BEIJING WATCH DATA SYST
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