541 lines
13 KiB
C
541 lines
13 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include "vfs_int.h"
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#include "fatfs_prefix_lib.h"
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#include "ff.h"
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#include "fatfs_config.h"
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static FRESULT last_result = FR_OK;
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static const char* const volstr[FF_VOLUMES] = {FF_VOLUME_STRS};
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static int is_current_drive = false;
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// forward declarations
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static int32_t myfatfs_close( const struct vfs_file *fd );
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static int32_t myfatfs_read( const struct vfs_file *fd, void *ptr, size_t len );
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static int32_t myfatfs_write( const struct vfs_file *fd, const void *ptr, size_t len );
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static int32_t myfatfs_lseek( const struct vfs_file *fd, int32_t off, int whence );
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static int32_t myfatfs_eof( const struct vfs_file *fd );
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static int32_t myfatfs_tell( const struct vfs_file *fd );
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static int32_t myfatfs_flush( const struct vfs_file *fd );
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static uint32_t myfatfs_fsize( const struct vfs_file *fd );
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static int32_t myfatfs_ferrno( const struct vfs_file *fd );
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static int32_t myfatfs_closedir( const struct vfs_dir *dd );
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static int32_t myfatfs_readdir( const struct vfs_dir *dd, struct vfs_stat *buf );
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static vfs_vol *myfatfs_mount( const char *name, int num );
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static vfs_file *myfatfs_open( const char *name, const char *mode );
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static vfs_dir *myfatfs_opendir( const char *name );
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static int32_t myfatfs_stat( const char *name, struct vfs_stat *buf );
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static int32_t myfatfs_remove( const char *name );
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static int32_t myfatfs_rename( const char *oldname, const char *newname );
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static int32_t myfatfs_mkdir( const char *name );
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static int32_t myfatfs_fsinfo( uint32_t *total, uint32_t *used );
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static int32_t myfatfs_chdrive( const char *name );
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static int32_t myfatfs_chdir( const char *name );
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static int32_t myfatfs_errno( void );
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static void myfatfs_clearerr( void );
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static int32_t myfatfs_umount( const struct vfs_vol *vol );
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// ---------------------------------------------------------------------------
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// function tables
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//
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static vfs_fs_fns myfatfs_fs_fns = {
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.mount = myfatfs_mount,
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.open = myfatfs_open,
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.opendir = myfatfs_opendir,
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.stat = myfatfs_stat,
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.remove = myfatfs_remove,
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.rename = myfatfs_rename,
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.mkdir = myfatfs_mkdir,
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.fsinfo = myfatfs_fsinfo,
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.fscfg = NULL,
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.format = NULL,
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.chdrive = myfatfs_chdrive,
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.chdir = myfatfs_chdir,
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.ferrno = myfatfs_errno,
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.clearerr = myfatfs_clearerr
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};
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static vfs_file_fns myfatfs_file_fns = {
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.close = myfatfs_close,
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.read = myfatfs_read,
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.write = myfatfs_write,
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.lseek = myfatfs_lseek,
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.eof = myfatfs_eof,
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.tell = myfatfs_tell,
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.flush = myfatfs_flush,
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.size = myfatfs_fsize,
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.ferrno = myfatfs_ferrno
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};
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static vfs_dir_fns myfatfs_dir_fns = {
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.close = myfatfs_closedir,
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.readdir = myfatfs_readdir
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};
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static vfs_vol_fns myfatfs_vol_fns = {
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.umount = myfatfs_umount
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};
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// ---------------------------------------------------------------------------
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// specific struct extensions
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//
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struct myvfs_vol {
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struct vfs_vol vfs_vol;
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char *ldrname;
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FATFS fs;
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};
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struct myvfs_file {
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struct vfs_file vfs_file;
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FIL fp;
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};
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struct myvfs_dir {
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struct vfs_dir vfs_dir;
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DIR dp;
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};
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// ---------------------------------------------------------------------------
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// exported helper functions for FatFS
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//
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void *ff_memalloc( UINT size )
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{
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return malloc( size );
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}
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void ff_memfree( void *mblock )
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{
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free( mblock );
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}
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// TODO
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DWORD get_fattime( void )
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{
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DWORD stamp;
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vfs_time tm;
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if (VFS_RES_OK == vfs_get_rtc( &tm )) {
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// sanity checks
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tm.year = (tm.year >= 1980) && (tm.year < 2108) ? tm.year : 1980;
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tm.mon = (tm.mon >= 1) && (tm.mon <= 12) ? tm.mon : 1;
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tm.day = (tm.day >= 1) && (tm.day <= 31) ? tm.day : 1;
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tm.hour = (tm.hour >= 0) && (tm.hour <= 23) ? tm.hour : 0;
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tm.min = (tm.min >= 0) && (tm.min <= 59) ? tm.min : 0;
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tm.sec = (tm.sec >= 0) && (tm.sec <= 59) ? tm.sec : 0;
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stamp = (tm.year-1980) << 25 | tm.mon << 21 | tm.day << 16 |
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tm.hour << 11 | tm.min << 5 | tm.sec;
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} else {
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// default time stamp derived from ffconf.h
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stamp = ((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16);
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}
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return stamp;
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}
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// ---------------------------------------------------------------------------
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// volume functions
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//
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#define GET_FATFS_FS(descr) \
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const struct myvfs_vol *myvol = (const struct myvfs_vol *)descr; \
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FATFS *fs = (FATFS *)&(myvol->fs);
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static int32_t myfatfs_umount( const struct vfs_vol *vol )
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{
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GET_FATFS_FS(vol);
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last_result = f_mount( NULL, myvol->ldrname, 0 );
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free( myvol->ldrname );
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free( (void *)vol );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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// ---------------------------------------------------------------------------
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// file functions
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//
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#define GET_FIL_FP(descr) \
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const struct myvfs_file *myfd = (const struct myvfs_file *)descr; \
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FIL *fp = (FIL *)&(myfd->fp);
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static int32_t myfatfs_close( const struct vfs_file *fd )
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{
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GET_FIL_FP(fd)
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last_result = f_close( fp );
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// free descriptor memory
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free( (void *)fd );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_read( const struct vfs_file *fd, void *ptr, size_t len )
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{
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GET_FIL_FP(fd);
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UINT act_read;
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last_result = f_read( fp, ptr, len, &act_read );
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return last_result == FR_OK ? act_read : VFS_RES_ERR;
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}
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static int32_t myfatfs_write( const struct vfs_file *fd, const void *ptr, size_t len )
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{
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GET_FIL_FP(fd);
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UINT act_written;
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last_result = f_write( fp, ptr, len, &act_written );
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return last_result == FR_OK ? act_written : VFS_RES_ERR;
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}
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static int32_t myfatfs_lseek( const struct vfs_file *fd, int32_t off, int whence )
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{
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GET_FIL_FP(fd);
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FSIZE_t new_pos;
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switch (whence) {
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default:
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case VFS_SEEK_SET:
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new_pos = off > 0 ? off : 0;
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break;
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case VFS_SEEK_CUR:
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new_pos = f_tell( fp );
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new_pos += off;
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break;
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case VFS_SEEK_END:
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new_pos = f_size( fp );
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new_pos += off < 0 ? off : 0;
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break;
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};
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last_result = f_lseek( fp, new_pos );
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new_pos = f_tell( fp );
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return last_result == FR_OK ? new_pos : VFS_RES_ERR;
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}
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static int32_t myfatfs_eof( const struct vfs_file *fd )
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{
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GET_FIL_FP(fd);
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last_result = FR_OK;
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return f_eof( fp );
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}
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static int32_t myfatfs_tell( const struct vfs_file *fd )
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{
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GET_FIL_FP(fd);
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last_result = FR_OK;
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return f_tell( fp );
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}
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static int32_t myfatfs_flush( const struct vfs_file *fd )
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{
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GET_FIL_FP(fd);
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last_result = f_sync( fp );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static uint32_t myfatfs_fsize( const struct vfs_file *fd )
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{
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GET_FIL_FP(fd);
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last_result = FR_OK;
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return f_size( fp );
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}
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static int32_t myfatfs_ferrno( const struct vfs_file *fd )
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{
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return -last_result;
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}
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// ---------------------------------------------------------------------------
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// dir functions
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//
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#define GET_DIR_DP(descr) \
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const struct myvfs_dir *mydd = (const struct myvfs_dir *)descr; \
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DIR *dp = (DIR *)&(mydd->dp);
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static int32_t myfatfs_closedir( const struct vfs_dir *dd )
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{
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GET_DIR_DP(dd);
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last_result = f_closedir( dp );
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// free descriptor memory
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free( (void *)dd );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static void myfatfs_fill_stat( const FILINFO *fno, struct vfs_stat *buf )
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{
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memset( buf, 0, sizeof( struct vfs_stat ) );
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// fill in supported stat entries
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strncpy( buf->name, fno->fname, FS_OBJ_NAME_LEN+1 );
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buf->name[FS_OBJ_NAME_LEN] = '\0';
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buf->size = fno->fsize;
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buf->is_dir = fno->fattrib & AM_DIR ? 1 : 0;
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buf->is_rdonly = fno->fattrib & AM_RDO ? 1 : 0;
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buf->is_hidden = fno->fattrib & AM_HID ? 1 : 0;
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buf->is_sys = fno->fattrib & AM_SYS ? 1 : 0;
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buf->is_arch = fno->fattrib & AM_ARC ? 1 : 0;
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struct vfs_time *tm = &(buf->tm);
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tm->year = (fno->fdate >> 9) + 1980;
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tm->mon = (fno->fdate >> 5) & 0x0f;
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tm->day = fno->fdate & 0x1f;
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tm->hour = (fno->ftime >> 11);
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tm->min = (fno->ftime >> 5) & 0x3f;
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tm->sec = fno->ftime & 0x3f;
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buf->tm_valid = 1;
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}
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static int32_t myfatfs_readdir( const struct vfs_dir *dd, struct vfs_stat *buf )
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{
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GET_DIR_DP(dd);
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FILINFO fno;
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if (FR_OK == (last_result = f_readdir( dp, &fno ))) {
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// condition "no further item" is signalled with empty name
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if (fno.fname[0] != '\0') {
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myfatfs_fill_stat( &fno, buf );
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return VFS_RES_OK;
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}
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}
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return VFS_RES_ERR;
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}
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// ---------------------------------------------------------------------------
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// filesystem functions
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//
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static vfs_vol *myfatfs_mount( const char *name, int num )
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{
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struct myvfs_vol *vol;
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const size_t len = strlen( name );
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// num argument specifies the physical driver = SS/CS pin number for this sd card
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if (num >= 0) {
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for (int i = 0; i < NUM_LOGICAL_DRIVES; i++) {
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if (0 == strncmp( name, volstr[i], strlen( volstr[i] ) )) {
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VolToPart[i].pd = num;
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}
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}
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}
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if (vol = malloc( sizeof( struct myvfs_vol ) )) {
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if (vol->ldrname = strdup( name )) {
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if (FR_OK == (last_result = f_mount( &(vol->fs), name, 1 ))) {
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vol->vfs_vol.fs_type = VFS_FS_FATFS;
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vol->vfs_vol.fns = &myfatfs_vol_fns;
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return (vfs_vol *)vol;
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}
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}
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}
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if (vol) {
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if (vol->ldrname) free( vol->ldrname );
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free( vol );
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}
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return NULL;
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}
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static BYTE myfatfs_mode2flag( const char *mode )
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{
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if (strlen( mode ) == 1) {
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if(strcmp( mode, "w" ) == 0)
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return FA_WRITE | FA_CREATE_ALWAYS;
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else if (strcmp( mode, "r" ) == 0)
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return FA_READ | FA_OPEN_EXISTING;
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else if (strcmp( mode, "a" ) == 0)
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return FA_WRITE | FA_OPEN_ALWAYS;
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else
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return FA_READ | FA_OPEN_EXISTING;
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} else if (strlen( mode ) == 2) {
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if (strcmp( mode, "r+" ) == 0)
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return FA_READ | FA_WRITE | FA_OPEN_EXISTING;
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else if (strcmp( mode, "w+" ) == 0)
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return FA_READ | FA_WRITE | FA_CREATE_ALWAYS;
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else if (strcmp( mode, "a+" ) ==0 )
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return FA_READ | FA_WRITE | FA_OPEN_ALWAYS;
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else
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return FA_READ | FA_OPEN_EXISTING;
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} else {
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return FA_READ | FA_OPEN_EXISTING;
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}
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}
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static vfs_file *myfatfs_open( const char *name, const char *mode )
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{
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struct myvfs_file *fd;
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const BYTE flags = myfatfs_mode2flag( mode );
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if (fd = malloc( sizeof( struct myvfs_file ) )) {
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if (FR_OK == (last_result = f_open( &(fd->fp), name, flags ))) {
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// skip to end of file for append mode
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if (flags & FA_OPEN_ALWAYS)
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f_lseek( &(fd->fp), f_size( &(fd->fp) ) );
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fd->vfs_file.fs_type = VFS_FS_FATFS;
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fd->vfs_file.fns = &myfatfs_file_fns;
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return (vfs_file *)fd;
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} else {
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free( fd );
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}
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}
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return NULL;
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}
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static vfs_dir *myfatfs_opendir( const char *name )
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{
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struct myvfs_dir *dd;
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if (dd = malloc( sizeof( struct myvfs_dir ) )) {
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if (FR_OK == (last_result = f_opendir( &(dd->dp), name ))) {
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dd->vfs_dir.fs_type = VFS_FS_FATFS;
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dd->vfs_dir.fns = &myfatfs_dir_fns;
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return (vfs_dir *)dd;
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} else {
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free( dd );
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}
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}
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return NULL;
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}
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static int32_t myfatfs_stat( const char *name, struct vfs_stat *buf )
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{
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FILINFO fno;
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if (FR_OK == (last_result = f_stat( name, &fno ))) {
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myfatfs_fill_stat( &fno, buf );
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return VFS_RES_OK;
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} else {
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return VFS_RES_ERR;
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}
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}
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static int32_t myfatfs_remove( const char *name )
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{
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last_result = f_unlink( name );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_rename( const char *oldname, const char *newname )
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{
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last_result = f_rename( oldname, newname );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_mkdir( const char *name )
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{
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last_result = f_mkdir( name );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_fsinfo( uint32_t *total, uint32_t *used )
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{
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DWORD free_clusters;
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FATFS *fatfs;
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if ((last_result = f_getfree( "", &free_clusters, &fatfs )) == FR_OK) {
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// provide information in kByte since uint32_t would clip to 4 GByte
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*total = (fatfs->n_fatent * fatfs->csize) / (1024 / FF_MAX_SS);
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*used = *total - (free_clusters * fatfs->csize) / (1024 / FF_MAX_SS);
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}
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_chdrive( const char *name )
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{
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last_result = f_chdrive( name );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_chdir( const char *name )
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{
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last_result = f_chdir( name );
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return last_result == FR_OK ? VFS_RES_OK : VFS_RES_ERR;
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}
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static int32_t myfatfs_errno( void )
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{
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return -last_result;
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}
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static void myfatfs_clearerr( void )
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{
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last_result = FR_OK;
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}
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// ---------------------------------------------------------------------------
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// VFS interface functions
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//
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vfs_fs_fns *myfatfs_realm( const char *inname, char **outname, int set_current_drive )
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{
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if (inname[0] == '/') {
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char *oname;
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// logical drive is specified, check if it's one of ours
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for (int i = 0; i < FF_VOLUMES; i++) {
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size_t volstr_len = strlen( volstr[i] );
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if (0 == strncmp( &(inname[1]), volstr[i], volstr_len )) {
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oname = strdup( inname );
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strcpy( oname, volstr[i] );
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oname[volstr_len] = ':';
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*outname = oname;
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if (set_current_drive) is_current_drive = TRUE;
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return &myfatfs_fs_fns;
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}
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}
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} else {
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// no logical drive in patchspec, are we current drive?
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if (is_current_drive) {
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*outname = strdup( inname );
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return &myfatfs_fs_fns;
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}
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}
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if (set_current_drive) is_current_drive = false;
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return NULL;
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}
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