4 * This file is part of BeRTOS.
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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21 * library without restriction. Specifically, if other files instantiate
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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.
37 * \author Luca Ottaviano <lottaviano@develer.com>
43 static size_t fatfile_read(struct KFile *_fd, void *buf, size_t size)
45 FatFile *fd = FATFILE_CAST(_fd);
47 fd->error_code = f_read(&fd->fat_file, buf, size, &count);
51 static size_t fatfile_write(struct KFile *_fd, const void *buf, size_t size)
53 FatFile *fd = FATFILE_CAST(_fd);
55 fd->error_code = f_write(&fd->fat_file, buf, size, &count);
59 static int fatfile_close(struct KFile *_fd)
61 FatFile *fd = FATFILE_CAST(_fd);
62 fd->error_code = f_close(&fd->fat_file);
69 static kfile_off_t fatfile_seek(struct KFile *_fd, kfile_off_t offset, KSeekMode whence)
71 /* clip at start-of-file
72 * don't clip at end-of-file when in write mode
74 FatFile *fd = FATFILE_CAST(_fd);
75 DWORD lseek_offset = 0;
80 lseek_offset = (DWORD) offset;
84 lseek_offset = fd->fat_file.fptr + (DWORD) offset;
87 if (fd->fat_file.fptr > (DWORD) (-offset))
88 lseek_offset = fd->fat_file.fptr - (DWORD)(-offset);
93 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
96 if (fd->fat_file.fsize > (DWORD) (-offset))
97 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
101 fd->error_code = f_lseek(&fd->fat_file, lseek_offset);
102 if ((fd->error_code) || (fd->fat_file.fptr != lseek_offset))
105 /* TODO: this conversion may overflow */
106 return (kfile_off_t)fd->fat_file.fptr;
109 static int fatfile_flush(struct KFile *_fd)
111 FatFile *fd = FATFILE_CAST(_fd);
112 fd->error_code = f_sync(&fd->fat_file);
119 static int fatfile_error(struct KFile *_fd)
121 FatFile *fd = FATFILE_CAST(_fd);
122 return (int)fd->error_code;
125 static void fatfile_clearerr(struct KFile *_fd)
127 FatFile *fd = FATFILE_CAST(_fd);
128 fd->error_code = FR_OK;
131 FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode)
133 DB(file->fd._type = KFT_FATFILE);
134 file->fd.read = fatfile_read;
135 file->fd.write = fatfile_write;
137 file->fd.close = fatfile_close;
138 file->fd.seek = fatfile_seek;
139 file->fd.flush = fatfile_flush;
140 file->fd.error = fatfile_error;
141 file->fd.clearerr = fatfile_clearerr;
142 return f_open(&file->fat_file, file_path, mode);