// Copyright 2011-2022, Molecular Matters GmbH <office@molecular-matters.com>
// See LICENSE.txt for licensing details (2-clause BSD License: https://opensource.org/licenses/BSD-2-Clause)

#include "PDB_PCH.h"
#include "PDB.h"
#include "PDB_Types.h"
#include "PDB_Util.h"
#include "PDB_RawFile.h"
#include "Foundation/PDB_PointerUtil.h"
#include "Foundation/PDB_CRT.h"


// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
PDB_NO_DISCARD PDB::ErrorCode PDB::ValidateFile(const void* data, size_t size) PDB_NO_EXCEPT
{
	// validate whether there is enough size for the super block
	if (size < sizeof(SuperBlock))
	{
		return ErrorCode::InvalidDataSize;
	}
	// validate the super block
	const SuperBlock* superBlock = Pointer::Offset<const SuperBlock*>(data, 0u);
	{
		// validate header magic
		if (memcmp(superBlock->fileMagic, SuperBlock::MAGIC, sizeof(SuperBlock::MAGIC)) != 0)
		{
			return ErrorCode::InvalidSuperBlock;
		}

		// validate whether enough size is provided for the PDB file
		// blockCount * blockSize is the size of the PDB file on disk
		if (size < superBlock->blockCount * superBlock->blockSize)
		{
			return ErrorCode::InvalidDataSize;
		}

		// validate free block map.
		// the free block map should always reside at either index 1 or 2.
		if (superBlock->freeBlockMapIndex != 1u && superBlock->freeBlockMapIndex != 2u)
		{
			return ErrorCode::InvalidFreeBlockMap;
		}
	}

	return ErrorCode::Success;
}


// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
PDB_NO_DISCARD PDB::RawFile PDB::CreateRawFile(const void* data) PDB_NO_EXCEPT
{
	return RawFile(data);
}