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#include "sdram-malloc.h"
#include "sdram-fs.h"
/* maximum number of files */
#ifndef SDFS_NFILE
#define SDFS_NFILE 4
#endif
__attribute__((section(".sdram1"))) filetab_t filetab[SDFS_NFILE];
static filetab_t *curfile;
static int nfile;
static int initialized = 0;
/* Initialize the SDRAM file system
*/
int sdfs_init(void)
{
if (initialized && nfile)
sdram_free(filetab[0].loc);
memset((void *)filetab, 0, sizeof(filetab));
curfile = NULL;
nfile = 0;
initialized = 1;
}
/* Return the number of entries in the file table
*/
int sdfs_count(void)
{
return nfile;
}
/* Return the first entry in the file table
*/
filetab_t *sdfs_first(void)
{
curfile = filetab;
return nfile ? curfile : NULL;
}
/* Return the next entry in the file table
*/
filetab_t *sdfs_next(void)
{
return (++curfile < &filetab[nfile]) ? curfile : NULL;
}
/* Open (create) a new file
*/
int sdfs_open(unsigned char *name)
{
if (nfile == SDFS_NFILE) {
curfile = NULL;
return -1;
}
curfile = &filetab[nfile];
strncpy(curfile->name, (char *)name, sizeof(curfile->name));
curfile->loc = sdram_malloc(0);
if (curfile->loc == NULL) {
curfile = NULL;
return -1;
}
curfile->len = 0;
++nfile;
return 0;
}
/* Write data to the open file
*/
int sdfs_write(unsigned char *buf, int len)
{
if (curfile == NULL)
return -1;
uint8_t *writeptr = sdram_malloc(len);
if (writeptr == NULL)
return -1;
memcpy(writeptr, buf, len);
curfile->len += len;
return 0;
}
/* Close the open file
*/
int sdfs_close(void)
{
if (curfile == NULL)
return -1;
int pad = ALIGN - (curfile->len & (ALIGN - 1));
if (sdram_malloc(pad) == NULL)
return -1;
curfile = NULL;
return 0;
}
/* Close and remove the open file
*/
int sdfs_cancel(void)
{
if (curfile == NULL)
return -1;
sdram_free(curfile->loc);
memset(curfile, 0, sizeof(*curfile));
--nfile;
return 0;
}
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