/*
 * Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
 * Distributed under the terms of the MIT License.
 */


#include "SuperBlock.h"

#include <string.h>

#include "BlockAllocator.h"
#include "Directory.h"
#include "Volume.h"


bool
SuperBlock::Check(uint64 totalBlocks) const
{
	if (strncmp(signature1, CHECK_SUM_FS_SIGNATURE_1,
			kCheckSumFSSignatureLength) != 0
		|| strncmp(signature2, CHECK_SUM_FS_SIGNATURE_2,
			kCheckSumFSSignatureLength) != 0
		|| Version() != kCheckSumFSVersion
		|| TotalBlocks() < kCheckSumFSMinSize / B_PAGE_SIZE
		|| TotalBlocks() > totalBlocks
		|| strnlen(name, kCheckSumFSNameLength) >= kCheckSumFSNameLength) {
		return false;
	}
	// TODO: Check free blocks and location of root directory and block bitmap.

	return true;
}


void
SuperBlock::Initialize(Volume* volume)
{
	memcpy(signature1, CHECK_SUM_FS_SIGNATURE_1, kCheckSumFSSignatureLength);
	memcpy(signature2, CHECK_SUM_FS_SIGNATURE_2, kCheckSumFSSignatureLength);

	version = kCheckSumFSVersion;
	totalBlocks = volume->TotalBlocks();
	freeBlocks = volume->GetBlockAllocator()->FreeBlocks();
	blockBitmap = volume->GetBlockAllocator()->BaseBlock();
	rootDir = volume->RootDirectory()->BlockIndex();
	strlcpy(name, volume->Name(), kCheckSumFSNameLength);
}


void
SuperBlock::SetFreeBlocks(uint64 count)
{
	freeBlocks = count;
}


void
SuperBlock::SetName(const char* name)
{
	strlcpy(this->name, name, kCheckSumFSNameLength);
}