A management method of smart card file system
A file system and management method technology, applied in the field of smart card operating system design, can solve the problems of file data storage failure, poor scalability, and low utilization rate of file data storage.
Active Publication Date: 2020-09-11
ZHENGZHOU XINDA JIEAN INFORMATION TECH
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Problems solved by technology
These file management modes stipulate the file data storage space of the directory when the directory is created, which limits the number of files created under the directory and the file data storage space, and the utilization rate of the file data storage is not high, and the scalability is poor. ;When a write error occurs when writing file data to the memory, it will cause file data storage failure and file data loss, and eventually even cause the smart card to be scrapped due to data storage errors
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[0065] The technical solutions of the present invention will be described in further detail below through specific implementation methods.
[0066] The invention discloses a smart card file management method based on the structure of a directory control necklace table and a file control necklace table. Control the creation of linked lists, search and delete directories and files, and write file data methods and other four basic methods. The basic method referred to in the present invention is applied in the smart card operating system, and has extremely extensive application in my country, as in operating systems such as bank IC card, social security card, SIM card, citizen card, temporary residence permit, bus card, resident health card, It is one of the core functions of the smart card operating system.
[0067] 1. Establishment of directory control item table and file control item table
[0068] When the smart card is initialized, according to the number of directories and...
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The invention provides a management method of a smart card file system. The method comprises the following steps: 1, the smart card receives a corresponding card initialization command and creates a directory control item table and a file control item table; 2, creating a main directory, a directory and a file; Step 3, accessing the directory and the file; 4, receive that instruction to write thedata of the file, and writing the data generate or carried in the execution process of the command into the corresponding area of the data storage designate by the file; If the data storage area specified by the file fails during the writing process, the file data writing failure tolerance mechanism is activated to store the file data to another area of the smart card data storage space.
Description
technical field [0001] The invention relates to the field of smart card operating system design, in particular to a management method of a smart card file system. Background technique [0002] At present, the file management based on the smart card operating system has no clear technical specifications in the ISO / IEC 7816 series of standards. Therefore, the file management in the smart card operating system is designed and implemented according to the relevant application goals. The file allocation table (FAT) mode of management adopts the file management mode of file identification, length and value field (TLV) nested structure and the relationship between directory and directory and directory and file based on the directory control item and file control item of the linked list structure. The file management mode that belongs to each other. These file management modes stipulate the file data storage space of the directory when the directory is created, which limits the num...
Claims
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IPC IPC(8): G06F16/16G06F16/13
Inventor 廖正赟张鲁国孙晓鹏刘武忠武宗品梁松涛彭金辉
Owner ZHENGZHOU XINDA JIEAN INFORMATION TECH