4 * This file is part of BeRTOS.
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14 * GNU General Public License for more details.
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18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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29 * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
33 * \brief FatFS: kfile interface for FatFS module by ChaN.
36 * \author Luca Ottaviano <lottaviano@develer.com>
42 static size_t fatfile_read(struct KFile *_fd, void *buf, size_t size)
44 FatFile *fd = FATFILE_CAST(_fd);
46 fd->error_code = f_read(&fd->fat_file, buf, size, &count);
50 static size_t fatfile_write(struct KFile *_fd, const void *buf, size_t size)
52 FatFile *fd = FATFILE_CAST(_fd);
54 fd->error_code = f_write(&fd->fat_file, buf, size, &count);
58 static int fatfile_close(struct KFile *_fd)
60 FatFile *fd = FATFILE_CAST(_fd);
61 fd->error_code = f_close(&fd->fat_file);
68 static kfile_off_t fatfile_seek(struct KFile *_fd, kfile_off_t offset, KSeekMode whence)
70 /* clip at start-of-file
71 * don't clip at end-of-file when in write mode
73 FatFile *fd = FATFILE_CAST(_fd);
74 DWORD lseek_offset = 0;
79 lseek_offset = (DWORD) offset;
83 lseek_offset = fd->fat_file.fptr + (DWORD) offset;
86 if (fd->fat_file.fptr > (DWORD) (-offset))
87 lseek_offset = fd->fat_file.fptr - (DWORD)(-offset);
92 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
95 if (fd->fat_file.fsize > (DWORD) (-offset))
96 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
100 fd->error_code = f_lseek(&fd->fat_file, lseek_offset);
101 if ((fd->error_code) || (fd->fat_file.fptr != lseek_offset))
104 /* TODO: this conversion may overflow */
105 return (kfile_off_t)fd->fat_file.fptr;
108 static int fatfile_flush(struct KFile *_fd)
110 FatFile *fd = FATFILE_CAST(_fd);
111 fd->error_code = f_sync(&fd->fat_file);
118 static int fatfile_error(struct KFile *_fd)
120 FatFile *fd = FATFILE_CAST(_fd);
121 return (int)fd->error_code;
124 static void fatfile_clearerr(struct KFile *_fd)
126 FatFile *fd = FATFILE_CAST(_fd);
127 fd->error_code = FR_OK;
130 FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode)
132 DB(file->fd._type = KFT_FATFILE);
133 file->fd.read = fatfile_read;
134 file->fd.write = fatfile_write;
136 file->fd.close = fatfile_close;
137 file->fd.seek = fatfile_seek;
138 file->fd.flush = fatfile_flush;
139 file->fd.error = fatfile_error;
140 file->fd.clearerr = fatfile_clearerr;
141 return f_open(&file->fat_file, file_path, mode);