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fatfs.cc
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fatfs.cc
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/*
* Interface to FatFs
* Designed to work with FatFs R0.14 and later
* This code is written by Eric R. Smith and placed in the
* public domain. The original FatFs copyright appears
* below; see also ff.c and similar files.
*/
#define DIR FFDIR
#define get_fattime _get_fattime
#define static
#include "ffunicode.c"
#include "ff.c"
#undef DIR
#undef static
/////////////////////////////////////////////////////////////////////////
// FlexC virtual file system glue code
/////////////////////////////////////////////////////////////////////////
#include <sys/types.h>
#include <sys/vfs.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
unsigned long long f_pinmask;
unsigned int _get_fattime()
{
time_t now;
unsigned ffdate, fftime;
struct tm date;
now = time(0);
gmtime_r(&now, &date);
ffdate = ((date.tm_year - 80) << 9) | ((date.tm_mon + 1) << 5) | ((date.tm_mday));
fftime = (date.tm_hour << 11) | (date.tm_min << 5) | (date.tm_sec);
return (ffdate << 16) | fftime;
}
static time_t unixtime(unsigned int dosdate, unsigned int dostime)
{
time_t t;
struct tm date;
date.tm_year = 80 + ((dosdate >> 9) & 0x7f);
date.tm_mon = ((dosdate >> 5) & 0xf) - 1;
date.tm_mday = (dosdate & 0x1f);
date.tm_hour = (dostime >> 11) & 0x1f;
date.tm_min = (dostime >> 5) & 0x3f;
date.tm_sec = (dostime & 0x1f) << 1;
t = mktime(&date);
#if 0
__builtin_printf(" ... unixtime: year=%u month = %u day = %u t = %u\n", year, month, day, t);
#endif
return t;
}
typedef struct fat_file {
struct _default_buffer b;
FIL fil;
} FAT_FIL;
static int _set_dos_error(int derr)
{
int r;
#ifdef _DEBUG_FATFS
__builtin_printf("_set_dos_error(%d)\n", derr);
#endif
switch (derr) {
case FR_OK:
r = 0;
break;
case FR_NO_FILE:
case FR_NO_PATH:
case FR_INVALID_NAME:
r = ENOENT;
break;
case FR_DENIED:
case FR_WRITE_PROTECTED:
r = EACCES;
break;
case FR_EXIST:
r = EEXIST;
break;
case FR_NOT_ENOUGH_CORE:
r = ENOMEM;
break;
case FR_INVALID_PARAMETER:
case FR_INVALID_OBJECT:
case FR_INVALID_DRIVE:
case FR_NOT_ENABLED:
case FR_NO_FILESYSTEM:
r = EINVAL;
break;
case FR_TOO_MANY_OPEN_FILES:
r = EMFILE;
break;
case FR_DISK_ERR:
case FR_INT_ERR:
case FR_NOT_READY:
default:
r = EIO;
break;
}
return _seterror(r);
}
int v_creat(vfs_file_t *fil, const char *pathname, mode_t mode)
{
int r;
FAT_FIL *f = malloc(sizeof(*f));
int fatmode;
if (!f) {
return _seterror(ENOMEM);
}
memset(f, 0, sizeof(*f));
fatmode = FA_CREATE_NEW | FA_WRITE | FA_READ;
r = f_open(&f->fil, pathname, fatmode);
#ifdef _DEBUG_FATFS
__builtin_printf("v_create(%s) returned %d\n", pathname, r);
#endif
if (r) {
free(f);
return _set_dos_error(r);
}
fil->vfsdata = f;
return 0;
}
int v_close(vfs_file_t *fil)
{
int r;
FAT_FIL *f = fil->vfsdata;
r=f_close(&f->fil);
free(f);
return _set_dos_error(r);
}
int v_opendir(DIR *dir, const char *name)
{
FFDIR *f = malloc(sizeof(*f));
int r;
#ifdef _DEBUG_FATFS
__builtin_printf("v_opendir(%s) this=%x\n", name, __this);
#endif
if (!f) {
#ifdef _DEBUG_FATFS
__builtin_printf("malloc failed\n");
#endif
return _seterror(ENOMEM);
}
r = f_opendir(f, name);
#ifdef _DEBUG_FATFS
__builtin_printf("f_opendir returned %d\n", r);
#endif
if (r) {
free(f);
return _set_dos_error(r);
}
dir->vfsdata = f;
return 0;
}
int v_closedir(DIR *dir)
{
int r;
FFDIR *f = dir->vfsdata;
r = f_closedir(f);
free(f);
if (r) _set_dos_error(r);
return r;
}
int v_readdir(DIR *dir, struct dirent *ent)
{
FILINFO finfo;
int r;
r = f_readdir(dir->vfsdata, &finfo);
#ifdef _DEBUG_FATFS
__builtin_printf("readdir fs_read: %d\n", r);
#endif
if (r != 0) {
return _set_dos_error(r); // error
}
if (finfo.fname[0] == 0) {
return -1; // EOF
}
#if FF_USE_LFN
strncpy(ent->d_name, finfo.fname, _NAME_MAX-1);
ent->d_name[_NAME_MAX-1] = 0;
#else
strcpy(ent->d_name, finfo.fname);
#endif
if (finfo.fattrib & AM_DIR) {
ent->d_type = DT_DIR;
} else {
ent->d_type = DT_REG;
}
ent->d_size = finfo.fsize;
ent->d_mtime = unixtime(finfo.fdate, finfo.ftime);
return 0;
}
int v_stat(const char *name, struct stat *buf)
{
int r;
FILINFO finfo;
unsigned mode;
#ifdef _DEBUG_FATFS
__builtin_printf("v_stat(%s)\n", name);
#endif
memset(buf, 0, sizeof(*buf));
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
/* root directory */
finfo.fattrib = AM_DIR;
r = 0;
} else {
r = f_stat(name, &finfo);
}
if (r != 0) {
return _set_dos_error(r);
}
mode = S_IRUSR | S_IRGRP | S_IROTH;
if (finfo.fattrib & AM_RDO) {
mode |= S_IWUSR | S_IWGRP | S_IWOTH;
}
if (finfo.fattrib & AM_DIR) {
mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
}
buf->st_mode = mode;
buf->st_nlink = 1;
buf->st_size = finfo.fsize;
buf->st_blksize = 512;
buf->st_blocks = (buf->st_size + 511) / 512;
buf->st_atime = buf->st_mtime = buf->st_ctime = unixtime(finfo.fdate, finfo.ftime);
#ifdef _DEBUG_FATFS
__builtin_printf("v_stat returning %d mode=0x%x\n", r, buf->st_mode);
#endif
return r;
}
ssize_t v_read(vfs_file_t *fil, void *buf, size_t siz)
{
FAT_FIL *f = fil->vfsdata;
int r;
UINT x;
if (!f) {
return _seterror(EBADF);
}
#ifdef _DEBUG_FATFS
__builtin_printf("v_read: fs_read of %u bytes:", siz);
#endif
r = f_read(&f->fil, buf, siz, &x);
#ifdef _DEBUG_FATFS
__builtin_printf(" ...returned %d\n", r);
#endif
if (r != 0) {
fil->state |= _VFS_STATE_ERR;
return _set_dos_error(r);
}
if (x == 0) {
fil->state |= _VFS_STATE_EOF;
}
return x;
}
ssize_t v_write(vfs_file_t *fil, void *buf, size_t siz)
{
FAT_FIL *f = fil->vfsdata;
int r;
UINT x;
if (!f) {
return _seterror(EBADF);
}
#if FF_FS_READONLY
return _seterror(EACCES);
#else
#ifdef _DEBUG_FATFS
__builtin_printf("v_write: f_write %d bytes:", siz);
#endif
r = f_write(&f->fil, buf, siz, &x);
#ifdef _DEBUG_FATFS
__builtin_printf("returned %d\n", r);
#endif
if (r != 0) {
fil->state |= _VFS_STATE_ERR;
return _set_dos_error(r);
}
return x;
#endif
}
off_t v_lseek(vfs_file_t *fil, off_t offset, int whence)
{
FAT_FIL *vf = fil->vfsdata;
FIL *f = &vf->fil;
int result;
if (!f) {
return _seterror(EBADF);
}
#ifdef DEBUG
__builtin_printf("v_lseek(%d, %d) ", offset, whence);
#endif
if (whence == SEEK_SET) {
/* offset is OK */
} else if (whence == SEEK_CUR) {
offset += f->fptr;
} else {
offset += f->obj.objsize;
}
result = f_lseek(f, offset);
#ifdef DEBUG
__builtin_printf("result=%d\n", result);
#endif
if (result) {
return _set_dos_error(result);
}
return offset;
}
int v_ioctl(vfs_file_t *fil, unsigned long req, void *argp)
{
return _seterror(EINVAL);
}
int v_mkdir(const char *name, mode_t mode)
{
#if FF_FS_READONLY
return _seterror(EACCES);
#else
int r;
r = f_mkdir(name);
return _set_dos_error(r);
#endif
}
int v_remove(const char *name)
{
#if FF_FS_READONLY
return _seterror(EACCES);
#else
int r;
r = f_unlink(name);
return _set_dos_error(r);
#endif
}
int v_rmdir(const char *name)
{
#if FF_FS_READONLY
return _seterror(EACCES);
#else
int r;
r = f_unlink(name);
return _set_dos_error(r);
#endif
}
int v_rename(const char *old, const char *new)
{
#if FF_FS_READONLY
return _seterror(EACCES);
#else
int r = f_rename(old, new);
return _set_dos_error(r);
#endif
}
int v_open(vfs_file_t *fil, const char *name, int flags)
{
int r;
FAT_FIL *f = malloc(sizeof(*f));
unsigned fs_flags;
if (!f) {
return _seterror(ENOMEM);
}
memset(f, 0, sizeof(*f));
switch (flags & 3) {
case O_RDONLY:
fs_flags = FA_READ;
break;
case O_WRONLY:
fs_flags = FA_WRITE;
break;
default:
fs_flags = FA_READ | FA_WRITE;
break;
}
if (flags & O_TRUNC) {
fs_flags |= FA_CREATE_ALWAYS | FA_OPEN_ALWAYS;
} else if (flags & O_APPEND) {
fs_flags |= FA_OPEN_APPEND;
} else {
//fs_flags |= FA_OPEN_ALWAYS; // no, FA_OPEN_ALWAYS creates a file
}
r = f_open(&f->fil, name, fs_flags);
if (r) {
free(f);
#if defined(_DEBUG_FATFS) && defined(__FLEXC__)
__builtin_printf(" f_open returned %d\n", r);
#endif
return _set_dos_error(r);
}
fil->vfsdata = f;
return 0;
}
int v_flush(vfs_file_t *fil) {
FAT_FIL *vf = fil->vfsdata;
FIL *f = &vf->fil;
int result;
if (!f) {
return _seterror(EBADF);
}
#ifdef DEBUG
__builtin_printf("v_flush() ");
#endif
result = f_sync(f);
#ifdef DEBUG
__builtin_printf("result=%d\n", result);
#endif
return _set_dos_error(result);
}
/* initialize (do first mount) */
/* for now this is a dummy function, but eventually some of the work
* in _vfs_open_sdcardx could be done here
*/
int v_init(const char *mountname)
{
return 0;
}
/* deinitialize (unmount) */
int v_deinit(const char *mountname)
{
int r = f_mount(0, "", 0);
#if defined(_DEBUG_FATFS) && defined(__FLEXC__)
__builtin_printf(" deinit: f_mount returned %d\n", r);
#endif
_freepins(f_pinmask);
return 0;
}
static struct vfs fat_vfs =
{
&v_close,
&v_read,
&v_write,
&v_lseek,
&v_ioctl,
&v_flush,
0, /* vfs_data */
0, /* reserved2 */
&v_open,
&v_creat,
&v_opendir,
&v_closedir,
&v_readdir,
&v_stat,
&v_mkdir,
&v_rmdir,
&v_remove,
&v_rename,
&v_init, /* init */
&v_deinit, /* deinit */
};
struct vfs *
get_vfs(void *ptr)
{
struct vfs *v = _gc_alloc_managed(sizeof(*v));
v->close = &v_close;
v->read = &v_read;
v->write = &v_write;
v->lseek = &v_lseek;
v->ioctl = &v_ioctl;
v->flush = 0; // no flush function
v->vfs_data = ptr;
v->reserved = 0;
v->open = &v_open;
v->creat = &v_creat;
v->opendir = &v_opendir;
v->closedir = &v_closedir;
v->readdir = &v_readdir;
v->stat = &v_stat;
v->mkdir = &v_mkdir;
v->rmdir = &v_rmdir;
v->remove = &v_remove;
v->rename = &v_rename;
v->init = &v_init;
v->deinit = &v_deinit;
return v;
}