/* 
 * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
 *                               RWTH Aachen University
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * This file is part of MetalSVM. 
 */

#include <metalsvm/fs.h>

fs_node_t *fs_root = NULL;		// The root of the filesystem.

uint32_t read_fs(fs_node_t * node, uint32_t offset, uint32_t size, uint8_t * buffer)
{
	// Has the node got a read callback?
	if (node->read != 0)
		return node->read(node, offset, size, buffer);
	else
		return 0;
}

uint32_t write_fs(fs_node_t * node, uint32_t offset, uint32_t size, uint8_t * buffer)
{
	// Has the node got a write callback?
	if (node->write != 0)
		return node->write(node, offset, size, buffer);
	else
		return 0;
}

void open_fs(fs_node_t * node, uint8_t read, uint8_t write)
{
	// Has the node got an open callback?
	if (node->open != 0)
		return node->open(node);
}

void close_fs(fs_node_t * node)
{
	// Has the node got a close callback?
	if (node->close != 0)
		return node->close(node);
}

struct dirent *readdir_fs(fs_node_t * node, uint32_t index)
{
	// Is the node a directory, and does it have a callback?
	if ((node->flags & 0x7) == FS_DIRECTORY && node->readdir != 0)
		return node->readdir(node, index);
	else
		return NULL;
}

fs_node_t *finddir_fs(fs_node_t * node, char *name)
{
	// Is the node a directory, and does it have a callback?
	if ((node->flags & 0x7) == FS_DIRECTORY && node->finddir != 0)
		return node->finddir(node, name);
	else
		return NULL;
}