FAT12文件系統(tǒng)的目錄操作

論文字?jǐn)?shù):22311,頁(yè)數(shù):56

摘要

 嵌入式系統(tǒng)應(yīng)用越來(lái)越廣泛，芯片類(lèi)型各不相同，應(yīng)用面種類(lèi)非常繁多，在嵌入式系統(tǒng)中文件系統(tǒng)廣泛使用，文件系統(tǒng)使信息和數(shù)據(jù)共享，并與計(jì)算機(jī)系統(tǒng)實(shí)現(xiàn)了信息交換。在商業(yè)化操作系統(tǒng)中，本身已經(jīng)帶有文件系統(tǒng)，但是價(jià)格非常昂貴，而我們能獲得的操作系統(tǒng)本身不帶文件系統(tǒng)，出于上述原因考慮，我們自己開(kāi)發(fā)需要的文件系統(tǒng)。文件系統(tǒng)作為整個(gè)系統(tǒng)的一個(gè)重要組成部分，和系統(tǒng)和平臺(tái)密切相關(guān)，不同平臺(tái)的底層驅(qū)動(dòng)不同，甚至不同的系統(tǒng)下需要特別的實(shí)現(xiàn)。
 由于整個(gè)文件系統(tǒng)本身是個(gè)非常龐大且復(fù)雜的系統(tǒng)，本論文中不能全部介紹。具體介紹實(shí)現(xiàn)的幾個(gè)相關(guān)模塊。實(shí)現(xiàn)了Philips LPC2214平臺(tái)FAT12文件系統(tǒng)。
 本文實(shí)現(xiàn)的是FAT12文件系統(tǒng)的目錄操作模塊。通過(guò)深入分析FAT12文件系統(tǒng)，設(shè)計(jì)FAT12各種數(shù)據(jù)結(jié)構(gòu),包括BPB數(shù)據(jù)結(jié)構(gòu)和目錄數(shù)據(jù)結(jié)構(gòu),結(jié)合命名規(guī)則和字符設(shè)置,實(shí)現(xiàn)了FAT12下各種常用目錄操作，包括新建，刪除等操作。目錄操作的各種實(shí)現(xiàn)嚴(yán)格遵照FAT12文件系統(tǒng)規(guī)范。
 
關(guān)鍵詞：嵌入式，文件系統(tǒng)，F(xiàn)AT12，目錄操作
Abstract
 
 The embedded system application is more and more widespread and is used in extremely many way. the type of chips is various . the file system widely uses in the embedded system, which causes the information and data sharing, and has realized the exchange of information with the computer system. In the commercialization operating system, it already has the file system, but the price is extremely expensive. We could obtain operating system that does not contain the file system. Considered from the above reason, we decide to develope the file system which needed. As an important constituent of  the overall system, The file system  has close correlation with the system and platform. Different system platforms use different drivers, and their file systems usually need the special realization. 
 Because entire file system itself is extremely huge and complex ,  I cannot introduce completely in the present paper. I will introduce several related modules that have been realized .
 The paper implements the directory operating module of the FAT12 file system for the Philips LPC2214 chip。I analysed the FAT12 file system ,designed kinds of data struct,such as BPB data struct and directory data struct。In accord with the name rules and char sets，I implement the directory operating fuctions，include adding directory，deleting directory and so on，which strictly conform to FAT12 file system criterion.
  
Key Words： The embedded system，file system,FAT12，directory operation
目錄
Abstract II
第1章 緒論 1
 1.1背景 1
 1.2 研究?jī)?nèi)容 1
第2章 項(xiàng)目相關(guān)技術(shù) 2
 2.1 嵌入式系統(tǒng) 2
 2.2 LPC2214 2
 2.3 文件系統(tǒng) 3
 2.3.1 什么是文件系統(tǒng) 3
 2.3.2 常見(jiàn)文件系統(tǒng) 3
第3章 FAT12文件系統(tǒng)分析 5
 3.1 優(yōu)缺點(diǎn)分析 5
 3.2 文件系統(tǒng)設(shè)計(jì) 5
 3.3 文件系統(tǒng)格式 6
 3.4 注意的問(wèn)題 8
第4章 FAT12文件系統(tǒng)實(shí)現(xiàn) 10
 4.1 文件系統(tǒng)組成 10
 4.2 啟動(dòng)扇區(qū)以及BPB 11
 4.3 FAT數(shù)據(jù)結(jié)構(gòu) 17
 4.4 FAT目錄結(jié)構(gòu) 18
 4.5 時(shí)間和日期格式 24
 4.6 命名規(guī)則和字符設(shè)置 24
第5章 目錄操作實(shí)現(xiàn) 26
 5.1 FAT12初始化 26
 5.2 創(chuàng)建目錄 28
 5.2.1 主函數(shù)解析 28
 5.2.2 相關(guān)函數(shù)解析 30
 5.3 刪除目錄 34
 5.3.1主函數(shù)解析 34
 5.3.2 相關(guān)函數(shù)解析 35
 5.4 修改目錄 36
 5.4.1 主函數(shù)解析 36
 5.4.2 相關(guān)函數(shù)解析 37
第6章 結(jié)論 38
致謝 39
參考文獻(xiàn) 40
附錄 主要函數(shù)代碼 41
 1.數(shù)據(jù)初始化 41
 2.創(chuàng)建目錄 46
 3.刪除目錄 50
 4.修改目錄名稱(chēng) 51
 5.修改目錄屬性 51