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bertos/io/kfile_block.c

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+/**
+ * \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 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief KFile interface over a KBlock.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ */
+
+#include "kfile_block.h"
+#include <string.h>
+
+
+/**
+ * ID for KFile over a KBlock.
+ */
+#define KFT_KFILEBLOCK MAKE_ID('K', 'F', 'B', 'L')
+
+/**
+ * Convert + ASSERT from generic KFile to KFileBlock.
+ */
+INLINE KFileBlock * KFILEBLOCK_CAST(KFile *fd)
+{
+	ASSERT(fd->_type == KFT_KFILEBLOCK);
+	return (KFileBlock *)fd;
+}
+
+#define KFILEBLOCK(dir, fd, buf, size) \
+({ \
+	KFileBlock *fb = KFILEBLOCK_CAST(fd); \
+	size_t len = 0; \
+	while (size) \
+	{ \
+		block_idx_t id = (fd)->seek_pos / fb->blk->blk_size; \
+		if (id >= fb->blk->blk_cnt) \
+			break; \
+		size_t offset = (fd)->seek_pos % fb->blk->blk_size; \
+		size_t count = MIN(size, (size_t)(fb->blk->blk_size - offset)); \
+		size_t ret_len = kblock_##dir(fb->blk, id, buf, offset, count); \
+		size -= ret_len; \
+		(fd)->seek_pos += ret_len; \
+		buf = buf + ret_len; \
+		len += ret_len; \
+		if (ret_len != count) \
+			break; \
+	} \
+	len; \
+})
+
+static size_t kfileblock_read(struct KFile *fd, void *_buf, size_t size)
+{
+	uint8_t *buf = (uint8_t *)_buf;
+	return KFILEBLOCK(read, fd, buf, size);
+}
+
+static size_t kfileblock_write(struct KFile *fd, const void *_buf, size_t size)
+{
+	const uint8_t *buf = (const uint8_t *)_buf;
+	return KFILEBLOCK(write, fd, buf, size);
+}
+
+static int kfileblock_flush(struct KFile *fd)
+{
+	KFileBlock *fb = KFILEBLOCK_CAST(fd);
+	return kblock_flush(fb->blk);
+}
+
+static int kfileblock_error(struct KFile *fd)
+{
+	KFileBlock *fb = KFILEBLOCK_CAST(fd);
+	return kblock_error(fb->blk);
+}
+
+static void kfileblock_clearerr(struct KFile *fd)
+{
+	KFileBlock *fb = KFILEBLOCK_CAST(fd);
+	return kblock_clearerr(fb->blk);
+}
+
+static int kfileblock_close(struct KFile *fd)
+{
+	KFileBlock *fb = KFILEBLOCK_CAST(fd);
+	return kblock_close(fb->blk);
+}
+
+void kfileblock_init(KFileBlock *fb, KBlock *blk)
+{
+	ASSERT(fb);
+	ASSERT(blk);
+	memset(fb, 0, sizeof(*fb));
+	kfile_init(&fb->fd);
+	DB(fb->fd._type = KFT_KFILEBLOCK);
+	fb->blk = blk;
+	fb->fd.size = blk->blk_cnt * blk->blk_size;
+	fb->fd.read = kfileblock_read;
+	fb->fd.write = kfileblock_write;
+	fb->fd.flush = kfileblock_flush;
+	fb->fd.error = kfileblock_error;
+	fb->fd.clearerr = kfileblock_clearerr;
+	fb->fd.close = kfileblock_close;
+}