CN101751427A - Method for reasonably using file space of smart card - Google Patents
Method for reasonably using file space of smart card Download PDFInfo
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- CN101751427A CN101751427A CN200810239500A CN200810239500A CN101751427A CN 101751427 A CN101751427 A CN 101751427A CN 200810239500 A CN200810239500 A CN 200810239500A CN 200810239500 A CN200810239500 A CN 200810239500A CN 101751427 A CN101751427 A CN 101751427A
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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
The present invention is a kind of method of rationally utilizing the file space, is mainly concerned with the embedded system development field.
Background technology
In the card of a multitude of names, smart card product is in ecommerce, and fields such as E-Government have obtained using widely; Present smart card product needs often to tackle the different stages in application process and its file system is adjusted, if each adjustment is hair fastener again all, or buying again, be that production procedure or production cost all can bring great inconvenience, under such situation, on intrinsic product, develop file delete and space reclamation function and just seem particularly urgent.
Summary of the invention
A kind of method of smart card file space of rationally utilizing disclosed in this invention can make the client at the application need of self its file system be adjusted, redundant file in using is deleted, can delete DDF, ADF, transparent file, log file, public and private key file, stored value card, electronic bankbook, document change after the deletion is specific file type, and changing original file structure, the file header size changes 7 bytes into, has so just reduced the size of fragment as much as possible, also belong to deleted document or fragment if find adjacent file, so just be integrated into a file; Carrying out running into the file of deleted document type in the process of file polling according to file tree, need calculate so that continue according to the file space after the change and seek downwards.When setting up file, at first to seek deleted file, utilize the algorithm of searching spatial optimization that deleted document is compared, find the only deleted file in space; If the space is big slightly, just form a deleted file or fragment at remaining space.In order successfully to set up new file, sufficient but when discontinuous, need do the work of disk arrangement at total free space, integrate free space.Unified resource, file delete and space reclamation mechanism just can very easily distribute file system and integrate again flexibly.
Description of drawings
Fig. 1: smart card file delete and space reclamation mechanism process flow diagram
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described:
1. deleted file changes original file type into the deleted document type, and file header becomes 7 bytes, and the file space is adjusted into the remaining space of removing 7 bytes, judges whether adjacent file is deleted document, if be integrated into a deleted document.If delete last file, then directly revise the effective length in catalogue space; Check input parameter, search the file that to delete, judge that whether erase right satisfies, and calculates deleted file length; Judge whether delete last file, integrate deleted file; Write the deleted file file header.
2. statistics catalogue space is counted the file header and the file space of deleted file in the residue useful space when handling the file of deleted file type in the lump;
3. when setting up new file, begin to travel through from current directory.Find out all deleted documents successively, find optimal space.Locating file during class file, judges whether the space size of deletion class file satisfies the size of new files to deletion earlier, if greater than newly-built file, then relatively whether the space differs minimum with the space of new files; If less than newly-built file, then skip this file, under current directory, continue to seek, up to end-of-file, compare with the catalogue remaining space in the space of finding again, and selects final enough big and a room minimum and come new files.On the deleted document space during new files, if deletion class file space greater than newly-built file space, need so remaining space is converted into a new deletion class file or a file fragmentation.Sufficient but when discontinuous, need do the work of disk arrangement at total free space, integrate free space.
Claims (4)
1. method of rationally utilizing the smart card file space: the redundant file in using is deleted and the defrag space, be it is characterized in that step is as follows:
(1) deleted file changes original file type into the deleted document type, judges whether adjacent file is deleted document, if be integrated into a deleted document; If delete last file, then directly revise catalogue valid data length;
(2) calculate the file header and the file space of deleted file in the residue useful space when handling the file of deleted file type in the lump in statistics catalogue space;
(3) set up new file, begin to travel through, find out all deleted documents successively, find optimal space from current directory.
2. a kind of method of rationally utilizing the smart card file space as claimed in claim 1 is characterized in that described step (1) specifically comprises following steps:
(1) procuratorial work input parameter;
(2) search the file that to delete;
(3) judge whether erase right satisfies;
(4) calculate deleted file length;
(5) judge whether delete last file, if then forward 9 to;
Whether be deleted file, if not, forward 8 to if (6) searching adjacent file;
(7) integrate deleted file;
(8) write the deleted file file header;
(9) new directory valid data length more.
3. method according to claim 1 is characterized in that rebuliding file on the file basis after the deletion, adjusts space distribution.
4. a kind of method of rationally utilizing the smart card file space as claimed in claim 1 is characterized in that described step (3) specifically comprises following steps:
(1) judge whether the space size of deletion class file satisfies the size of new files, if greater than newly-built file, then relatively whether the space differs minimum with the space of new files; If less than newly-built file, then skip this file;
(2) continue to seek under current directory, up to end-of-file, compare with the catalogue remaining space in the space of finding again, and selects final enough big and a room minimum and come new files;
(3) on the deleted document space during new files, if deletion class file space greater than newly-built file space, remaining space is converted into a new deletion class file or a file fragmentation;
(4) sufficient but when discontinuous, do the disk housekeeping at total free space, integrate free space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810239500A CN101751427A (en) | 2008-12-12 | 2008-12-12 | Method for reasonably using file space of smart card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810239500A CN101751427A (en) | 2008-12-12 | 2008-12-12 | Method for reasonably using file space of smart card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101751427A true CN101751427A (en) | 2010-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810239500A Pending CN101751427A (en) | 2008-12-12 | 2008-12-12 | Method for reasonably using file space of smart card |
Country Status (1)
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| CN (1) | CN101751427A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567522A (en) * | 2011-12-28 | 2012-07-11 | 北京握奇数据系统有限公司 | Method and device for managing file system of intelligent card |
| CN102682024A (en) * | 2011-03-11 | 2012-09-19 | 中国科学院高能物理研究所 | Method for recombining incomplete JPEG file fragmentation |
| CN105656866A (en) * | 2014-12-02 | 2016-06-08 | 华为技术有限公司 | Data encryption method and system |
-
2008
- 2008-12-12 CN CN200810239500A patent/CN101751427A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682024A (en) * | 2011-03-11 | 2012-09-19 | 中国科学院高能物理研究所 | Method for recombining incomplete JPEG file fragmentation |
| CN102682024B (en) * | 2011-03-11 | 2014-02-05 | 中国科学院高能物理研究所 | Method for recombining incomplete JPEG file fragmentation |
| CN102567522A (en) * | 2011-12-28 | 2012-07-11 | 北京握奇数据系统有限公司 | Method and device for managing file system of intelligent card |
| CN102567522B (en) * | 2011-12-28 | 2014-07-30 | 北京握奇数据系统有限公司 | Method and device for managing file system of intelligent card |
| CN105656866A (en) * | 2014-12-02 | 2016-06-08 | 华为技术有限公司 | Data encryption method and system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100623 |