From b65e60edaa04a0d0bec335198d7cf2279f3a22ae Mon Sep 17 00:00:00 2001
From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Thu, 21 May 2009 10:43:26 +0000
Subject: [PATCH] Added kfile interface implementation for FatFS.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@2693 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/fs/fat.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++
 bertos/fs/fat.h |  67 +++++++++++++++++++++
 2 files changed, 217 insertions(+)
 create mode 100644 bertos/fs/fat.c
 create mode 100644 bertos/fs/fat.h

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);
+}
+
diff --git a/bertos/fs/fat.h b/bertos/fs/fat.h
new file mode 100644
index 00000000..77d046ee
--- /dev/null
+++ b/bertos/fs/fat.h
@@ -0,0 +1,67 @@
+/**
+ * \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>
+ *
+ */
+#ifndef FS_FAT_H
+#define FS_FAT_H
+
+#include <kern/kfile.h>
+#include "fatfs/src/ff.h"
+
+typedef struct FatFile
+{
+	KFile fd;
+	FIL fat_file;
+	FRESULT error_code;       ///< error code for calls like kfile_read
+} FatFile;
+
+#define KFT_FATFILE MAKE_ID('F', 'A', 'T', 'F')
+
+INLINE FatFile * FATFILE_CAST(KFile *fd)
+{
+	ASSERT(fd->_type == KFT_FATFILE);
+	return (FatFile *)fd;
+}
+
+/**
+ * Initialize \a file and open \a file_path for reading.
+ */
+FRESULT fatfile_open(FatFile *file, const char *file_path, BYTE mode);
+
+#endif /* FS_FAT_H */
+
-- 
2.25.1