fs_fun.c

凌阳SPCE3200 系统开发板随机自带源程序。共安排了32个子目录

#include "FS_fun.h"

struct f_info g_stFileTbl[MAXFILENUM];	//note information of one type files(name,modify time&date,size)
U16 g_nFileNum;							//note the number of one type files
SPG_Time g_stFileTime;				//note modify time of an appointed file
SPG_Date g_stFileDate;				//note modify date of an appointed file

/**
 * FS_ListFile - list all files in the storage device according to wildcard
 * char *wildcard: the path and wildcard
 */
void FS_ListFile(char *wildcard)
{
	//initialize file system
	fs_init();
	
	if( fs_mount(0) )
		while(1);

	//clear file Number
	g_nFileNum = 0;
	
	if(_findfirst(wildcard, &g_stFileTbl[g_nFileNum], D_ALL))
	{
		//No such file
		while(1);
	}

	do{
		g_nFileNum ++;
	}while( _findnext(&g_stFileTbl[g_nFileNum]) == 0 );
}

/**
 * FS_GetFileName - get the name of the appointed file
 * U16 index: the index in the g_stFileTbl
 * RETURN: the pointer of name string
 *         NULL: no such file
 */
char* FS_GetFileName(U16 index)
{
	if(index < g_nFileNum)
		return &g_stFileTbl[index].f_name[0];
	
	return NULL;
}

/**
 * FS_GetModifyTime - get modify time of an appointed file
 * U16 index: the index in the g_stFileTbl
 */
void FS_GetModifyTime(U16 index)
{
	U32 tmp;

	//clear
	*(U32*)(&g_stFileTime) = 0;

	if(index >= g_nFileNum)
		return;

	//get time
	tmp = (g_stFileTbl[index].f_time << 1);
	*(U32*)(&g_stFileTime) = tmp;
}

/**
 * FS_GetModifyDate - get modify date of an appointed file
 * U16 index: the index in the g_stFileTbl
 */
void FS_GetModifyDate(U16 index)
{
	U32 tmp;

	//clear
	*(U32*)(&g_stFileDate) = 0;

	if(index >= g_nFileNum)
		return;

	//get date
	tmp = g_stFileTbl[index].f_date;
	g_stFileDate.dd = tmp & 0x0000001F;
	g_stFileDate.mm = (tmp >> 5) & 0x0000000F;
	g_stFileDate.yy = ((tmp >> 9) & 0x0000007F) + 1980;
}

/**
 * FS_GetFileSize - get the size of the appointed file
 * U16 index: the index in the g_stFileTbl
 * RETURN: file size(unit: Byte)
 *         0xffffffff: no such file
 */
unsigned long FS_GetFileSize(U16 index)
{
	if(index < g_nFileNum)
		return g_stFileTbl[index].f_size;
	
	return 0xffffffff;
}

/**
 * FS_TotalSize - get the total size of storage device
 * RETURN: total size(unit: Byte)
 */
unsigned long FS_TotalSize(void)
{
    struct _diskfree_t diskinfo;
    unsigned long total_cluster;
	//unsigned long sperc;
	//unsigned long bpers;
	unsigned long totalsize;
	
	if(_getdiskfree(0, &diskinfo))
		while(1);
	total_cluster = diskinfo.total_clusters+13;
	//sperc = diskinfo.sectors_per_cluster;
	//bpers = diskinfo.bytes_per_sector;
	totalsize = total_cluster * diskinfo.sectors_per_cluster * diskinfo.bytes_per_sector;

	return totalsize;
}

/**
 * FS_FreeSize - get the free size of storage device
 * RETURN: free size(unit: Byte)
 */
unsigned long FS_FreeSize(void)
{
    struct _diskfree_t diskinfo;
    unsigned long free_cluster;
	//unsigned long sperc;
	//unsigned long bpers;
	unsigned long freesize;
	
	if(_getdiskfree(0, &diskinfo))
		while(1);
	free_cluster = diskinfo.avail_clusters+15;
	//sperc = diskinfo.sectors_per_cluster;
	//bpers = diskinfo.bytes_per_sector;
	freesize = free_cluster * diskinfo.sectors_per_cluster * diskinfo.bytes_per_sector;

	return freesize;
}