/*
 * Copyright 2022, Raghav Sharma, raghavself28@gmail.com
 * Distributed under the terms of the MIT License.
 */
#ifndef _XFS_VHEADER_H
#define _XFS_VHEADER_H


#include "BPlusTree.h"
#include "Checksum.h"
#include "Extent.h"
#include "Inode.h"
#include "LeafDirectory.h"
#include "Node.h"
#include "xfs_types.h"
#include "system_dependencies.h"


// Common template function to Verify all forms of header
template<class T>
bool VerifyHeader(T* header, char* buffer, Inode* inode,
        int howManyBlocksFurther, ExtentMapEntry* map, int8 WhichDirectory)
{
        if (header->Magic() != T::ExpectedMagic(WhichDirectory, inode)) {
                ERROR("Bad magic number");
                return false;
        }

        if (inode->Version() == 1 || inode->Version() == 2)
                return true;

        if (!xfs_verify_cksum(buffer, inode->DirBlockSize(), T::CRCOffset())) {
                ERROR("CRC is invalid");
                return false;
        }

        // For Block header we pass NULL
        if(map != NULL) {
                uint64 actualBlockToRead = inode->FileSystemBlockToAddr(map->br_startblock
                        + howManyBlocksFurther) / XFS_MIN_BLOCKSIZE;

                if (actualBlockToRead != header->Blockno()) {
                        ERROR("Wrong Block number");
                        return false;
                }
        }

        if (!inode->GetVolume()->UuidEquals(header->Uuid())) {
                ERROR("UUID is incorrect");
                return false;
        }

        if (inode->ID() != header->Owner()) {
                ERROR("Wrong data owner");
                return false;
        }

        return true;
}