144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2009 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief FatFS: kfile interface for FatFS module by ChaN.
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*
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*
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* \author Luca Ottaviano <lottaviano@develer.com>
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*
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*/
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#include "fat.h"
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static size_t fatfile_read(struct KFile *_fd, void *buf, size_t size)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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UINT count;
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fd->error_code = f_read(&fd->fat_file, buf, size, &count);
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return count;
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}
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static size_t fatfile_write(struct KFile *_fd, const void *buf, size_t size)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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UINT count;
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fd->error_code = f_write(&fd->fat_file, buf, size, &count);
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return count;
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}
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static int fatfile_close(struct KFile *_fd)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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fd->error_code = f_close(&fd->fat_file);
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if (fd->error_code)
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return EOF;
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else
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return 0;
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}
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static kfile_off_t fatfile_seek(struct KFile *_fd, kfile_off_t offset, KSeekMode whence)
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{
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/* clip at start-of-file
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* don't clip at end-of-file when in write mode
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*/
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FatFile *fd = FATFILE_CAST(_fd);
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DWORD lseek_offset = 0;
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switch (whence)
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{
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case KSM_SEEK_SET:
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if (offset > 0)
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lseek_offset = (DWORD) offset;
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break;
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case KSM_SEEK_CUR:
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if (offset > 0)
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lseek_offset = fd->fat_file.fptr + (DWORD) offset;
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else
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{
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if (fd->fat_file.fptr > (DWORD) (-offset))
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lseek_offset = fd->fat_file.fptr - (DWORD)(-offset);
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}
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break;
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case KSM_SEEK_END:
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if (offset > 0)
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lseek_offset = fd->fat_file.fsize + (DWORD) offset;
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else
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{
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if (fd->fat_file.fsize > (DWORD) (-offset))
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lseek_offset = fd->fat_file.fsize + (DWORD) offset;
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}
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break;
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}
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fd->error_code = f_lseek(&fd->fat_file, lseek_offset);
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if ((fd->error_code) || (fd->fat_file.fptr != lseek_offset))
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return EOF;
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else
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/* TODO: this conversion may overflow */
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return (kfile_off_t)fd->fat_file.fptr;
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}
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static int fatfile_flush(struct KFile *_fd)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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fd->error_code = f_sync(&fd->fat_file);
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if (fd->error_code)
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return EOF;
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else
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return 0;
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}
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static int fatfile_error(struct KFile *_fd)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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return (int)fd->error_code;
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}
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static void fatfile_clearerr(struct KFile *_fd)
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{
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FatFile *fd = FATFILE_CAST(_fd);
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fd->error_code = FR_OK;
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}
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FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode)
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{
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DB(file->fd._type = KFT_FATFILE);
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file->fd.read = fatfile_read;
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file->fd.write = fatfile_write;
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file->fd.reopen = 0;
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file->fd.close = fatfile_close;
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file->fd.seek = fatfile_seek;
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file->fd.flush = fatfile_flush;
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file->fd.error = fatfile_error;
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file->fd.clearerr = fatfile_clearerr;
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return f_open(&file->fat_file, file_path, mode);
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}
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