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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);
80 lseek_offset = (DWORD) offset;
86 lseek_offset = fd->fat_file.fptr + (DWORD) offset;
89 if (fd->fat_file.fptr > (DWORD) (-offset))
90 lseek_offset = fd->fat_file.fptr - (DWORD)(-offset);
97 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
100 if (fd->fat_file.fsize > (DWORD) (-offset))
101 lseek_offset = fd->fat_file.fsize + (DWORD) offset;
107 fd->error_code = f_lseek(&fd->fat_file, lseek_offset);
108 if ((fd->error_code) || (fd->fat_file.fptr != lseek_offset))
111 /* TODO: this conversion may overflow */
112 return (kfile_off_t)fd->fat_file.fptr;
115 static int fatfile_flush(struct KFile *_fd)
117 FatFile *fd = FATFILE_CAST(_fd);
118 fd->error_code = f_sync(&fd->fat_file);
125 static int fatfile_error(struct KFile *_fd)
127 FatFile *fd = FATFILE_CAST(_fd);
128 return (int)fd->error_code;
131 static void fatfile_clearerr(struct KFile *_fd)
133 FatFile *fd = FATFILE_CAST(_fd);
134 fd->error_code = FR_OK;
137 FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode)
139 DB(file->fd._type = KFT_FATFILE);
140 file->fd.read = fatfile_read;
141 file->fd.write = fatfile_write;
143 file->fd.close = fatfile_close;
144 file->fd.seek = fatfile_seek;
145 file->fd.flush = fatfile_flush;
146 file->fd.error = fatfile_error;
147 file->fd.clearerr = fatfile_clearerr;
148 return f_open(&file->fat_file, file_path, mode);