X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Ffs%2Ffat.c;fp=bertos%2Ffs%2Ffat.c;h=aca2fa30d4a9078e504a4cb2a724b0d382fe10fc;hb=b65e60edaa04a0d0bec335198d7cf2279f3a22ae;hp=0000000000000000000000000000000000000000;hpb=0774f0adbb7c85ab48bc4ba83e3c0473f68bd73b;p=bertos.git

diff --git a/bertos/fs/fat.c b/bertos/fs/fat.c
new file mode 100644
index 00000000..aca2fa30
--- /dev/null
+++ b/bertos/fs/fat.c
@@ -0,0 +1,150 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief FatFS: kfile interface for FatFS module by ChaN.
+ *
+ * \version $Id$
+ *
+ * \author Luca Ottaviano <lottaviano@develer.com>
+ *
+ */
+
+#include "fat.h"
+
+static size_t fatfile_read(struct KFile *_fd, void *buf, size_t size)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	UINT count;
+	fd->error_code = f_read(&fd->fat_file, buf, size, &count);
+	return count;
+}
+
+static size_t fatfile_write(struct KFile *_fd, const void *buf, size_t size)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	UINT count;
+	fd->error_code = f_write(&fd->fat_file, buf, size, &count);
+	return count;
+}
+
+static int fatfile_close(struct KFile *_fd)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	fd->error_code = f_close(&fd->fat_file);
+	if (fd->error_code)
+		return EOF;
+	else
+		return 0;
+}
+
+static kfile_off_t fatfile_seek(struct KFile *_fd, kfile_off_t offset, KSeekMode whence)
+{
+	/* clip at start-of-file
+	 * don't clip at end-of-file when in write mode
+	 */
+	FatFile *fd = FATFILE_CAST(_fd);
+	DWORD lseek_offset;
+	switch (whence)
+	{
+	case KSM_SEEK_SET:
+		if (offset > 0)
+			lseek_offset = (DWORD) offset;
+		else
+			lseek_offset = 0;
+		break;
+	case KSM_SEEK_CUR:
+		if (offset > 0)
+			lseek_offset = fd->fat_file.fptr + (DWORD) offset;
+		else
+		{
+			if (fd->fat_file.fptr > (DWORD) (-offset))
+				lseek_offset = fd->fat_file.fptr - (DWORD)(-offset);
+			else
+				lseek_offset = 0;
+		}
+		break;
+	case KSM_SEEK_END:
+		if (offset > 0)
+			lseek_offset = fd->fat_file.fsize + (DWORD) offset;
+		else
+		{
+			if (fd->fat_file.fsize > (DWORD) (-offset))
+				lseek_offset = fd->fat_file.fsize + (DWORD) offset;
+			else
+				lseek_offset = 0;
+		}
+		break;
+	}
+	fd->error_code = f_lseek(&fd->fat_file, lseek_offset);
+	if ((fd->error_code) || (fd->fat_file.fptr != lseek_offset))
+		return EOF;
+	else
+		/* TODO: this conversion may overflow */
+		return (kfile_off_t)fd->fat_file.fptr;
+}
+
+static int fatfile_flush(struct KFile *_fd)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	fd->error_code = f_sync(&fd->fat_file);
+	if (fd->error_code)
+		return EOF;
+	else
+		return 0;
+}
+
+static int fatfile_error(struct KFile *_fd)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	return (int)fd->error_code;
+}
+
+static void fatfile_clearerr(struct KFile *_fd)
+{
+	FatFile *fd = FATFILE_CAST(_fd);
+	fd->error_code = FR_OK;
+}
+
+FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode)
+{
+	file->fd._type = KFT_FATFILE;
+	file->fd.read = fatfile_read;
+	file->fd.write = fatfile_write;
+	file->fd.reopen = 0;
+	file->fd.close = fatfile_close;
+	file->fd.seek = fatfile_seek;
+	file->fd.flush = fatfile_flush;
+	file->fd.error = fatfile_error;
+	file->fd.clearerr = fatfile_clearerr;
+	return f_open(&file->fat_file, file_path, mode);
+}
+