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// Python CFFI bindings for fatfs
//
// Copyright (C) 2021 Eric Callahan <arksine.code@gmail.com>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // memset
#include <stdlib.h> // malloc
#include "fatfs_api.h" // python-fatfs prototypes
#include "../../lib/fatfs/ff.h" // fatfs APIs
#include "../../lib/fatfs/diskio.h" // fatfs media APIs (callbacks)
/* Callbacks */
static uint8_t (*python_disk_status)(void) = 0;
static uint8_t (*python_disk_initialize)(void) = 0;
static uint8_t (*python_disk_read)(uint8_t* buff, uint32_t sector,
unsigned int count) = 0;
static uint8_t (*python_disk_write)(const uint8_t* buff, uint32_t sector,
unsigned int count) = 0;
static uint8_t (*python_disk_ioctl)(uint8_t cmd, void* buff) = 0;
static uint32_t (*python_fattime)(void) = 0;
void __visible
fatfs_set_callbacks(
uint8_t (*status_callback)(void),
uint8_t (*init_callback)(void),
uint8_t (*read_callback)(uint8_t*, uint32_t, unsigned int),
uint8_t (*write_callback)(const uint8_t*, uint32_t, unsigned int),
uint8_t (*ioctl_callback)(uint8_t, void*),
uint32_t (*fattime_callback)(void)
)
{
python_disk_status = status_callback;
python_disk_initialize = init_callback;
python_disk_read = read_callback;
python_disk_write = write_callback;
python_disk_ioctl = ioctl_callback;
python_fattime = fattime_callback;
}
void __visible
fatfs_clear_callbacks(void)
{
python_disk_status = 0;
python_disk_initialize = 0;
python_disk_read = 0;
python_disk_write = 0;
python_disk_ioctl = 0;
python_fattime = 0;
}
/* Callbacks from fatfs to python. These methods are used to */
/* Access access the SD Card APIs */
/* Get FAT Time */
DWORD
get_fattime(void)
{
if (python_fattime == 0)
{
// Return a default FATTIME of 1/1/2021
return 41 << 25 | 1 << 21 | 1 << 16;
}
return python_fattime();
}
DSTATUS
disk_status(BYTE pdrv)
{
if (python_disk_status != 0)
return python_disk_status();
return STA_NOINIT;
}
DSTATUS
disk_initialize(BYTE pdrv)
{
if (python_disk_initialize != 0)
return python_disk_initialize();
return STA_NOINIT;
}
DRESULT
disk_read(BYTE pdrv, BYTE *buff, LBA_t sector, UINT count)
{
if (python_disk_read != 0)
return python_disk_read(buff, sector, count);
return RES_NOTRDY;
}
DRESULT
disk_write(BYTE pdrv, const BYTE *buff, LBA_t sector, UINT count)
{
if (python_disk_write != 0)
return python_disk_write(buff, sector, count);
return RES_NOTRDY;
}
DRESULT
disk_ioctl(BYTE pdrv, BYTE cmd, void *buff)
{
if (python_disk_ioctl != 0)
return python_disk_ioctl(cmd, buff);
return RES_NOTRDY;
}
/* Python-FatFS Interface Functions */
// Wrapper around the FatFS FIL struct. FIL is type defined
// anonymously, thus can't be forward declared and poses
// challenges with CFFI.
struct ff_file {
FIL fobj;
};
static FATFS fs;
uint8_t __visible
fatfs_mount(void)
{
FRESULT res;
memset(&fs, 0, sizeof(fs));
res = f_mount(&fs, "", 1);
return res;
}
uint8_t __visible
fatfs_unmount(void)
{
FRESULT res;
res = f_unmount("");
memset(&fs, 0, sizeof(fs));
return res;
}
struct ff_file* __visible
fatfs_open(const char* path, uint8_t mode)
{
FRESULT res;
struct ff_file* fhdl = malloc(sizeof(*fhdl));
memset(fhdl, 0, sizeof(*fhdl));
res = f_open(&(fhdl->fobj), path, mode);
if (res != FR_OK) {
free(fhdl);
fhdl = NULL;
}
return fhdl;
}
uint8_t __visible
fatfs_close(struct ff_file* fhdl)
{
FRESULT res;
res = f_close(&(fhdl->fobj));
free(fhdl);
return res;
}
int __visible
fatfs_read(struct ff_file* fhdl, void* rbuf, uint16_t btr)
{
FRESULT res;
UINT bytes_read;
res = f_read(&(fhdl->fobj), rbuf, btr, &bytes_read);
if (res != FR_OK) {
return -res;
}
return bytes_read;
}
int __visible
fatfs_write(struct ff_file* fhdl, const void* wbuf, uint16_t btw)
{
FRESULT res;
UINT bytes_written;
res = f_write(&(fhdl->fobj), wbuf, btw, &bytes_written);
if (bytes_written < btw) {
return -res;
}
return bytes_written;
}
// Remove a file or director
uint8_t __visible
fatfs_remove(const char* path)
{
FRESULT res;
res = f_unlink(path);
return res;
}
uint8_t __visible
fatfs_get_fstats(struct ff_file_info* finfo, const char* path)
{
FRESULT res;
FILINFO nfo;
res = f_stat(path, &nfo);
if (res == FR_OK)
memcpy(finfo, &nfo, sizeof(nfo));
return res;
}
uint8_t __visible
fatfs_get_disk_info(struct ff_disk_info* dinfo)
{
FRESULT res;
res = f_getlabel("", dinfo->label, &(dinfo->serial_number));
if (res != FR_OK)
return res;
dinfo->fs_type = fs.fs_type;
return res;
}
uint8_t __visible
fatfs_list_dir(struct ff_file_info* flist, uint8_t max_size, char* path)
{
FRESULT res;
DIR dir;
FILINFO nfo;
res = f_opendir(&dir, path);
if (res == FR_OK) {
for (uint8_t i=0; i < max_size; i++) {
res = f_readdir(&dir, &nfo);
if (res != FR_OK ||nfo.fname[0] == 0)
break;
memcpy(&(flist[i]), &nfo, sizeof(nfo));
}
}
return FR_OK;
}
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