/*
 * 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);
}