nes-proj/arch/cpu/arm/common/SD-card/cfs-sdcard.c

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C
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#include <efs-sdcard.h>
#include <sys/process.h>
#include <cfs/cfs.h>
#include <debug-uart.h>
#include <stdio.h>
process_event_t sdcard_inserted_event;
process_event_t sdcard_removed_event;
#define MAX_FDS 4
static File file_descriptors[MAX_FDS];
static int
find_free_fd()
{
int fd;
for (fd = 0; fd < MAX_FDS; fd++) {
if (!file_getAttr(&file_descriptors[fd], FILE_STATUS_OPEN)) {
return fd;
}
}
return -1;
}
static File *
get_file(int fd)
{
if (!sdcard_ready()) return 0;
if (fd >= MAX_FDS || fd < 0) return NULL;
if (!file_getAttr(&file_descriptors[fd], FILE_STATUS_OPEN)) return NULL;
return &file_descriptors[fd];
}
int
cfs_open (const char *name, int flags)
{
static int initialized = 0;
eint8 mode;
int fd;
if (!initialized) {
int fd;
/* Mark all file descriptors as free */
for (fd = 0; fd < MAX_FDS; fd++) {
file_setAttr(&file_descriptors[fd], FILE_STATUS_OPEN,0);
}
}
if (!sdcard_ready()) return -1;
fd = find_free_fd();
if (fd < 0) return -1;
if (flags == CFS_READ) {
mode = MODE_READ;
} else {
mode = MODE_APPEND;
}
if (file_fopen(&file_descriptors[fd], efs_sdcard_get_fs(),
(char*)name, mode) < 0) {
return -1;
}
return fd;
}
void
cfs_close(int fd)
{
File *file = get_file(fd);
if (!file) return;
file_fclose(file);
fs_flushFs(efs_sdcard_get_fs());
}
int
cfs_read (int fd, void *buf, unsigned int len)
{
File *file = get_file(fd);
if (!file) return 0;
return file_read(file, len, (euint8*)buf);
}
int
cfs_write (int fd, const void *buf, unsigned int len)
{
File *file = get_file(fd);
if (!file) return 0;
return file_write(file, len, (euint8*)buf);
}
cfs_offset_t
cfs_seek (int fd, cfs_offset_t offset, int whence)
{
File *file;
if (whence != CFS_SEEK_SET) return -1;
file = get_file(fd);
if (!file) return 0;
if (file_setpos(file, offset) != 0) return -1;
return file->FilePtr;
}
/* Cause a compile time error if expr is false */
#ifdef __GNUC__
#define COMPILE_TIME_CHECK(expr) \
(void) (__builtin_choose_expr ((expr), 0, ((void)0))+3)
#else
#define COMPILE_TIME_CHECK(expr)
#endif
#define MAX_DIR_LISTS 4
DirList dir_lists[MAX_DIR_LISTS];
static DirList *
find_free_dir_list()
{
unsigned int l;
for(l = 0; l < MAX_DIR_LISTS; l++) {
if (dir_lists[l].fs == NULL) {
return &dir_lists[l];
}
}
return NULL;
}
int
cfs_opendir (struct cfs_dir *dirp, const char *name)
{
DirList *dirs;
COMPILE_TIME_CHECK(sizeof(DirList*) <= sizeof(struct cfs_dir));
if (!sdcard_ready()) return -1;
dirs = find_free_dir_list();
if (!dirs) return -1;
if (ls_openDir(dirs, efs_sdcard_get_fs(), (eint8*)name) != 0) {
dirs->fs = NULL;
return -1;
}
*(DirList**)dirp = dirs;
return 0;
}
int
cfs_readdir (struct cfs_dir *dirp, struct cfs_dirent *dirent)
{
euint8 *start;
euint8 *end;
char *to = dirent->name;
DirList *dirs = *(DirList**)dirp;
if (!sdcard_ready()) return 1;
if (ls_getNext(dirs) != 0) return 1;
start = dirs->currentEntry.FileName;
end = start + 7;
while(end > start) {
if (*end > ' ') {
end++;
break;
}
end--;
}
while(start < end) {
*to++ = *start++;
}
start = dirs->currentEntry.FileName + 8;
end = start + 3;
if (*start > ' ') {
*to++ = '.';
*to++ = *start++;
while(start < end && *start > ' ') {
*to++ = *start++;
}
}
*to = '\0';
if (dirs->currentEntry.Attribute & ATTR_DIRECTORY) {
dirent->size = 0;
} else {
dirent->size = dirs->currentEntry.FileSize;
}
return 0;
}
void
cfs_closedir (struct cfs_dir *dirp)
{
(*(DirList**)dirp)->fs = NULL;
}