48 lines
2.4 KiB
C
48 lines
2.4 KiB
C
#ifndef CPOS_FAT16_H
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#define CPOS_FAT16_H
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#define SECTOR_SIZE 512
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#define FAT1_SECTORS 32 //FAT1占用扇区数
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#define ROOT_DIR_SECTORS 32 //根目录占用扇区数
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#define SECTOR_NUM_OF_FAT1_START 1 //FAT1起始扇区号
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#define SECTOR_NUM_OF_ROOT_DIR_START 33 //根目录起始扇区号
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#define SECTOR_NUM_OF_DATA_START 65 //数据区起始扇区号，对应簇号为2。
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#define SECTOR_CLUSTER_BALANCE SECTOR_NUM_OF_DATA_START - 2 //簇号加上该值正好对应扇区号。
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#define MAX_FILE_NUM 16 //最大文件数
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// FAT16目录项结构(32B);
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struct File {
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// 文件名 如果第一个字节为0xe5，代表这个文件已经被删除；如果第一个字节为0x00，代表这一段不包含任何文件名信息。
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unsigned char name[8];
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unsigned char ext[3]; // 扩展名
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// 属性：bit0只读文件，bit1隐藏文件，bit2系统文件，bit3非文件信息(比如磁盘名称)，bit4目录，bit5文件。
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unsigned char type; // 0x20 文件 | 0x10 目录
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unsigned char reserve[10]; // 保留
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unsigned short time; // 最后一次写入时间
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unsigned short date; // 最后一次写入日期
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unsigned short clustno; // 起始簇号
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unsigned int size; // 文件大小
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};
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void read_root_dir_sector1(struct File *root_entries);
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void save_root_dir_sector1(struct File *root_entries);
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void read_one_cluster(unsigned short clustno, unsigned int memory_addrress);
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int read_root_dir(struct File *file_infos);
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void get_fat1(unsigned short *fat1);
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void save_fat1(unsigned short *fat1);
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void get_file_all_clustnos(unsigned short first_clustno, unsigned short *clustnos);
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void get_file_all_clustnos(unsigned short first_clustno, unsigned short *clustnos);
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void read_file(struct File *file, void *file_addr);
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void check_name_or_ext(char *str, int len);
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void check_name_and_ext(char *name, char *ext);
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void analyse_fullname(char *fullname, char *name, char *ext);
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int find_file(char *name, char *ext, struct File *const file);
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struct File *create_file(char *fullname);
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struct File *create_dir(char *fullname);
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struct File *open_file(char *fullname);
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void alter_file_name(struct File *file, char *new_fullname);
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void alter_dir_entry(struct File *file);
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void save_file(struct File *file, char *content);
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void delete_file(struct File *file);
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#endif |