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bertos/io/kblock_posix.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/)
+ *
+ * -->
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ *
+ * \brief KBlock interface over libc files.
+ *
+ * notest: avr
+ * notest: arm
+ */
+
+
+#include "kblock_posix.h"
+#include <string.h>
+#include <stdio.h>
+
+
+static int kblockposix_load(KBlock *b, block_idx_t index)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	fseek(f->fp, index * b->blk_size, SEEK_SET);
+	return (fread(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
+}
+
+static int kblockposix_store(struct KBlock *b, block_idx_t index)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	fseek(f->fp, index * b->blk_size, SEEK_SET);
+	return (fwrite(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
+}
+
+static size_t kblockposix_readBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	memcpy(buf, (uint8_t *)f->b.priv.buf + offset, size);
+	return size;
+}
+
+static size_t kblockposix_readDirect(struct KBlock *b, block_idx_t index, void *buf, size_t offset, size_t size)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
+	return fread(buf, 1, size, f->fp);
+}
+
+static size_t kblockposix_writeBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	memcpy((uint8_t *)f->b.priv.buf + offset, buf, size);
+	return size;
+}
+
+static size_t kblockposix_writeDirect(struct KBlock *b, block_idx_t index, const void *buf, size_t offset, size_t size)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	ASSERT(buf);
+	ASSERT(index < b->blk_cnt);
+	fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
+	return fwrite(buf, 1, size, f->fp);
+}
+
+static int kblockposix_error(struct KBlock *b)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	return ferror(f->fp);
+}
+
+
+static void kblockposix_claererr(struct KBlock *b)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+	clearerr(f->fp);
+}
+
+
+static int kblockposix_close(struct KBlock *b)
+{
+	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
+
+	return fflush(f->fp) | fclose(f->fp);
+}
+
+
+static const KBlockVTable kblockposix_hwbuffered_vt =
+{
+	.readDirect = kblockposix_readDirect,
+
+	.readBuf = kblockposix_readBuf,
+	.writeBuf = kblockposix_writeBuf,
+	.load = kblockposix_load,
+	.store = kblockposix_store,
+
+	.error = kblockposix_error,
+	.clearerr = kblockposix_claererr,
+	.close = kblockposix_close,
+};
+
+static const KBlockVTable kblockposix_swbuffered_vt =
+{
+	.readDirect = kblockposix_readDirect,
+	.writeDirect =kblockposix_writeDirect,
+
+	.readBuf = kblock_swReadBuf,
+	.writeBuf = kblock_swWriteBuf,
+	.load = kblock_swLoad,
+	.store = kblock_swStore,
+
+	.error = kblockposix_error,
+	.clearerr = kblockposix_claererr,
+	.close = kblockposix_close,
+};
+
+static const KBlockVTable kblockposix_unbuffered_vt =
+{
+	.readDirect = kblockposix_readDirect,
+	.writeDirect =kblockposix_writeDirect,
+
+	.error = kblockposix_error,
+	.clearerr = kblockposix_claererr,
+	.close = kblockposix_close,
+};
+
+
+
+void kblockposix_init(KBlockPosix *f, FILE *fp, bool hwbuf, void *buf, size_t block_size, block_idx_t block_count)
+{
+	ASSERT(f);
+	ASSERT(fp);
+	ASSERT(block_size);
+
+	memset(f, 0, sizeof(*f));
+
+	DB(f->b.priv.type = KBT_KBLOCKPOSIX);
+
+	f->fp = fp;
+	f->b.blk_size = block_size;
+	f->b.blk_cnt = block_count;
+
+	f->b.priv.flags |= KB_PARTIAL_WRITE;
+	if (buf)
+	{
+		f->b.priv.flags |= KB_BUFFERED;
+		f->b.priv.buf = buf;
+		if (hwbuf)
+			f->b.priv.vt = &kblockposix_hwbuffered_vt;
+		else
+			f->b.priv.vt = &kblockposix_swbuffered_vt;
+		kblockposix_load(&f->b, 0);
+		f->b.priv.curr_blk = 0;
+	}
+	else
+		f->b.priv.vt = &kblockposix_unbuffered_vt;
+}