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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include <algorithm>
#include "pch.h"
#include "MemoryFileStream.hpp"
namespace Diligent
{
MemoryFileStream::MemoryFileStream(IReferenceCounters* pRefCounters,
IDataBlob* pData) :
TBase{pRefCounters},
m_DataBlob{pData}
{
}
IMPLEMENT_QUERY_INTERFACE(MemoryFileStream, IID_FileStream, TBase)
bool MemoryFileStream::Read(void* Data, size_t Size)
{
VERIFY_EXPR(m_CurrentOffset <= m_DataBlob->GetSize());
auto BytesLeft = m_DataBlob->GetSize() - m_CurrentOffset;
auto BytesToRead = std::min(BytesLeft, Size);
auto* pSrcData = reinterpret_cast<const Uint8*>(m_DataBlob->GetDataPtr()) + m_CurrentOffset;
memcpy(Data, pSrcData, BytesToRead);
m_CurrentOffset += BytesToRead;
return Size == BytesToRead;
}
void MemoryFileStream::ReadBlob(IDataBlob* pData)
{
auto BytesLeft = m_DataBlob->GetSize() - m_CurrentOffset;
pData->Resize(BytesLeft);
auto res = Read(pData->GetDataPtr(), pData->GetSize());
VERIFY_EXPR(res);
(void)res;
}
bool MemoryFileStream::Write(const void* Data, size_t Size)
{
if (m_CurrentOffset + Size > m_DataBlob->GetSize())
{
m_DataBlob->Resize(m_CurrentOffset + Size);
}
auto* DstData = reinterpret_cast<Uint8*>(m_DataBlob->GetDataPtr()) + m_CurrentOffset;
memcpy(DstData, Data, Size);
m_CurrentOffset += Size;
return true;
}
bool MemoryFileStream::IsValid()
{
return !!m_DataBlob;
}
size_t MemoryFileStream::GetSize()
{
return m_DataBlob->GetSize();
}
} // namespace Diligent
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