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85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
// StreamObjects.cpp
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#include "StdAfx.h"
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#include "StreamObjects.h"
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STDMETHODIMP CBufInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize != NULL)
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*processedSize = 0;
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if (_pos > _size)
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return E_FAIL;
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size_t rem = _size - (size_t)_pos;
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if (size < rem)
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rem = (size_t)size;
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memcpy(data, _data + (size_t)_pos, rem);
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_pos += rem;
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if (processedSize != NULL)
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*processedSize = (UInt32)rem;
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return S_OK;
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}
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STDMETHODIMP CBufInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
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{
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switch(seekOrigin)
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{
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case STREAM_SEEK_SET: _pos = offset; break;
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case STREAM_SEEK_CUR: _pos += offset; break;
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case STREAM_SEEK_END: _pos = _size + offset; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (newPosition)
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*newPosition = _pos;
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return S_OK;
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}
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void CWriteBuffer::Write(const void *data, size_t size)
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{
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size_t newCapacity = _size + size;
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_buffer.EnsureCapacity(newCapacity);
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memcpy(_buffer + _size, data, size);
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_size += size;
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}
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STDMETHODIMP CSequentialOutStreamImp::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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_writeBuffer.Write(data, (size_t)size);
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if(processedSize != NULL)
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*processedSize = size;
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return S_OK;
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}
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STDMETHODIMP CSequentialOutStreamImp2::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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size_t rem = _size - _pos;
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if (size < rem)
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rem = (size_t)size;
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memcpy(_buffer + _pos, data, rem);
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_pos += rem;
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if (processedSize != NULL)
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*processedSize = (UInt32)rem;
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return (rem == size ? S_OK : E_FAIL);
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}
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STDMETHODIMP CSequentialInStreamSizeCount::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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UInt32 realProcessedSize;
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HRESULT result = _stream->Read(data, size, &realProcessedSize);
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_size += realProcessedSize;
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if (processedSize != 0)
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*processedSize = realProcessedSize;
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return result;
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}
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STDMETHODIMP CSequentialOutStreamSizeCount::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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UInt32 realProcessedSize;
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HRESULT result = _stream->Write(data, size, &realProcessedSize);
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_size += realProcessedSize;
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if (processedSize != 0)
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*processedSize = realProcessedSize;
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return result;
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}
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