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/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "LinearAllocator.h"
#include "MemCopy.h"
namespace iSTD
{
/*****************************************************************************\
Class:
CBuffer
Description:
Allocates and manages a system memory buffer
\*****************************************************************************/
template<class CAllocatorType>
class CBuffer : public CLinearAllocator<CAllocatorType>
{
public:
CBuffer( void );
virtual ~CBuffer( void );
bool Allocate( const DWORD allocSize, const DWORD alignSize );
void Deallocate( void );
DWORD GetBlockSize( void ) const;
void* GetLinearAddress( void ) const;
protected:
BYTE* m_pAllocAddress; // Address of allocation pointer
};
/*****************************************************************************\
Function:
CBuffer Constructor
Description:
Initializes internal data
Input:
none
Output:
none
\*****************************************************************************/
template<class CAllocatorType>
inline CBuffer<CAllocatorType>::CBuffer( void )
: CLinearAllocator<CAllocatorType>( NULL, 0 )
{
m_pAllocAddress = NULL;
}
/*****************************************************************************\
Function:
CBuffer Destructor
Description:
Deletes internal data
Input:
none
Output:
none
\*****************************************************************************/
template<class CAllocatorType>
inline CBuffer<CAllocatorType>::~CBuffer( void )
{
Deallocate();
}
/*****************************************************************************\
Function:
CBuffer::Allocate
Description:
Allocates memory for the buffer
Input:
const DWORD allocSize - size in bytes
const DWORD alignSize - alignment in bytes
Output:
bool - success or fail
\*****************************************************************************/
template<class CAllocatorType>
inline bool CBuffer<CAllocatorType>::Allocate(
const DWORD allocSize,
const DWORD alignSize )
{
Deallocate();
const DWORD alignedAllocSize = allocSize + alignSize;
if( alignedAllocSize )
{
m_pAllocAddress = (BYTE*)CAllocatorType::Allocate( alignedAllocSize );
if( m_pAllocAddress )
{
const DWORD offset = ( alignSize )
? GetAlignmentOffset( m_pAllocAddress, alignSize )
: 0;
this->m_pBaseAddress = this->m_pAllocAddress + offset;
this->m_Size = allocSize;
SafeMemSet( this->m_pBaseAddress, 0, this->m_Size );
}
else
{
ASSERT(0);
this->m_Size = 0;
}
}
else
{
ASSERT(0);
this->m_Size = 0;
}
this->m_SizeUsed = 0;
this->m_SizeReserved = 0;
return ( this->m_Size ) ? true : false;
}
/*****************************************************************************\
Function:
CBuffer::Deallocate
Description:
Deallocates memory for the buffer
Input:
none
Output:
none
\*****************************************************************************/
template<class CAllocatorType>
inline void CBuffer<CAllocatorType>::Deallocate( void )
{
CAllocatorType::Deallocate( m_pAllocAddress );
m_pAllocAddress = NULL;
this->m_pBaseAddress = NULL;
this->m_Size = 0;
this->m_SizeUsed = 0;
this->m_SizeReserved = 0;
}
/*****************************************************************************\
Function:
CBuffer::GetBlockSize
Description:
Gets the total size of the buffer
Input:
none
Output:
DWORD - size in bytes
\*****************************************************************************/
template<class CAllocatorType>
inline DWORD CBuffer<CAllocatorType>::GetBlockSize( void ) const
{
return this->m_Size;
}
/*****************************************************************************\
Function:
CBuffer::GetLinearAddress
Description:
Gets the base address of the buffer
Input:
void
Output:
void* - linear address
\*****************************************************************************/
template<class CAllocatorType>
inline void* CBuffer<CAllocatorType>::GetLinearAddress( void ) const
{
return (void*)(this->m_pBaseAddress);
}
} // iSTD
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