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368 lines
9.3 KiB
368 lines
9.3 KiB
// LimitedStreams.cpp
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#include "StdAfx.h"
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#include <string.h>
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#include "LimitedStreams.h"
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STDMETHODIMP CLimitedSequentialInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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UInt32 realProcessedSize = 0;
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{
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const UInt64 rem = _size - _pos;
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if (size > rem)
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size = (UInt32)rem;
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}
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HRESULT result = S_OK;
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if (size != 0)
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{
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result = _stream->Read(data, size, &realProcessedSize);
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_pos += realProcessedSize;
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if (realProcessedSize == 0)
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_wasFinished = true;
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}
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if (processedSize)
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*processedSize = realProcessedSize;
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return result;
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}
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STDMETHODIMP CLimitedInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize)
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*processedSize = 0;
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if (_virtPos >= _size)
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{
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// 9.31: Fixed. Windows doesn't return error in ReadFile and IStream->Read in that case.
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return S_OK;
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// return (_virtPos == _size) ? S_OK: E_FAIL; // ERROR_HANDLE_EOF
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}
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{
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const UInt64 rem = _size - _virtPos;
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if (size > rem)
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size = (UInt32)rem;
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}
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UInt64 newPos = _startOffset + _virtPos;
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if (newPos != _physPos)
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{
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_physPos = newPos;
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RINOK(SeekToPhys());
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}
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HRESULT res = _stream->Read(data, size, &size);
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if (processedSize)
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*processedSize = size;
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_physPos += size;
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_virtPos += size;
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return res;
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}
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STDMETHODIMP CLimitedInStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END: offset += _size; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = offset;
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if (newPosition)
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*newPosition = _virtPos;
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return S_OK;
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}
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HRESULT CreateLimitedInStream(IInStream *inStream, UInt64 pos, UInt64 size, ISequentialInStream **resStream)
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{
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*resStream = 0;
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CLimitedInStream *streamSpec = new CLimitedInStream;
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CMyComPtr<ISequentialInStream> streamTemp = streamSpec;
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streamSpec->SetStream(inStream);
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RINOK(streamSpec->InitAndSeek(pos, size));
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streamSpec->SeekToStart();
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*resStream = streamTemp.Detach();
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return S_OK;
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}
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STDMETHODIMP CClusterInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize)
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*processedSize = 0;
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if (_virtPos >= Size)
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return S_OK;
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{
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UInt64 rem = Size - _virtPos;
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if (size > rem)
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size = (UInt32)rem;
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}
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if (size == 0)
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return S_OK;
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if (_curRem == 0)
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{
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const UInt32 blockSize = (UInt32)1 << BlockSizeLog;
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const UInt32 virtBlock = (UInt32)(_virtPos >> BlockSizeLog);
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const UInt32 offsetInBlock = (UInt32)_virtPos & (blockSize - 1);
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const UInt32 phyBlock = Vector[virtBlock];
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UInt64 newPos = StartOffset + ((UInt64)phyBlock << BlockSizeLog) + offsetInBlock;
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if (newPos != _physPos)
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{
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_physPos = newPos;
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RINOK(SeekToPhys());
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}
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_curRem = blockSize - offsetInBlock;
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for (int i = 1; i < 64 && (virtBlock + i) < (UInt32)Vector.Size() && phyBlock + i == Vector[virtBlock + i]; i++)
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_curRem += (UInt32)1 << BlockSizeLog;
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}
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if (size > _curRem)
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size = _curRem;
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HRESULT res = Stream->Read(data, size, &size);
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if (processedSize)
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*processedSize = size;
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_physPos += size;
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_virtPos += size;
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_curRem -= size;
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return res;
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}
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STDMETHODIMP CClusterInStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END: offset += Size; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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if (_virtPos != (UInt64)offset)
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_curRem = 0;
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_virtPos = offset;
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if (newPosition)
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*newPosition = offset;
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return S_OK;
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}
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STDMETHODIMP CExtentsStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize)
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*processedSize = 0;
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if (_virtPos >= Extents.Back().Virt)
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return S_OK;
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if (size == 0)
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return S_OK;
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unsigned left = 0, right = Extents.Size() - 1;
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for (;;)
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{
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unsigned mid = (left + right) / 2;
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if (mid == left)
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break;
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if (_virtPos < Extents[mid].Virt)
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right = mid;
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else
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left = mid;
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}
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const CSeekExtent &extent = Extents[left];
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UInt64 phyPos = extent.Phy + (_virtPos - extent.Virt);
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if (_needStartSeek || _phyPos != phyPos)
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{
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_needStartSeek = false;
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_phyPos = phyPos;
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RINOK(SeekToPhys());
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}
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UInt64 rem = Extents[left + 1].Virt - _virtPos;
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if (size > rem)
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size = (UInt32)rem;
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HRESULT res = Stream->Read(data, size, &size);
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_phyPos += size;
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_virtPos += size;
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if (processedSize)
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*processedSize = size;
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return res;
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}
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STDMETHODIMP CExtentsStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END: offset += Extents.Back().Virt; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = offset;
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if (newPosition)
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*newPosition = _virtPos;
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return S_OK;
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}
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STDMETHODIMP CLimitedSequentialOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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HRESULT result = S_OK;
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if (processedSize)
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*processedSize = 0;
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if (size > _size)
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{
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if (_size == 0)
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{
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_overflow = true;
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if (!_overflowIsAllowed)
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return E_FAIL;
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if (processedSize)
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*processedSize = size;
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return S_OK;
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}
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size = (UInt32)_size;
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}
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if (_stream)
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result = _stream->Write(data, size, &size);
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_size -= size;
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if (processedSize)
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*processedSize = size;
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return result;
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}
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STDMETHODIMP CTailInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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UInt32 cur;
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HRESULT res = Stream->Read(data, size, &cur);
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if (processedSize)
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*processedSize = cur;
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_virtPos += cur;
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return res;
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}
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STDMETHODIMP CTailInStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END:
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{
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UInt64 pos = 0;
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RINOK(Stream->Seek(offset, STREAM_SEEK_END, &pos));
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if (pos < Offset)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = pos - Offset;
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if (newPosition)
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*newPosition = _virtPos;
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return S_OK;
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}
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = offset;
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if (newPosition)
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*newPosition = _virtPos;
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return Stream->Seek(Offset + _virtPos, STREAM_SEEK_SET, NULL);
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}
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STDMETHODIMP CLimitedCachedInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize)
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*processedSize = 0;
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if (_virtPos >= _size)
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{
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// 9.31: Fixed. Windows doesn't return error in ReadFile and IStream->Read in that case.
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return S_OK;
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// return (_virtPos == _size) ? S_OK: E_FAIL; // ERROR_HANDLE_EOF
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}
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UInt64 rem = _size - _virtPos;
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if (rem < size)
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size = (UInt32)rem;
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UInt64 newPos = _startOffset + _virtPos;
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UInt64 offsetInCache = newPos - _cachePhyPos;
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HRESULT res = S_OK;
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if (newPos >= _cachePhyPos &&
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offsetInCache <= _cacheSize &&
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size <= _cacheSize - (size_t)offsetInCache)
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{
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if (size != 0)
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memcpy(data, _cache + (size_t)offsetInCache, size);
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}
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else
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{
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if (newPos != _physPos)
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{
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_physPos = newPos;
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RINOK(SeekToPhys());
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}
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res = _stream->Read(data, size, &size);
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_physPos += size;
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}
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if (processedSize)
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*processedSize = size;
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_virtPos += size;
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return res;
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}
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STDMETHODIMP CLimitedCachedInStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END: offset += _size; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = offset;
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if (newPosition)
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*newPosition = _virtPos;
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return S_OK;
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}
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STDMETHODIMP CTailOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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UInt32 cur;
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HRESULT res = Stream->Write(data, size, &cur);
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if (processedSize)
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*processedSize = cur;
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_virtPos += cur;
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if (_virtSize < _virtPos)
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_virtSize = _virtPos;
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return res;
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}
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STDMETHODIMP CTailOutStream::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: break;
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case STREAM_SEEK_CUR: offset += _virtPos; break;
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case STREAM_SEEK_END: offset += _virtSize; break;
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default: return STG_E_INVALIDFUNCTION;
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}
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if (offset < 0)
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return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
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_virtPos = offset;
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if (newPosition)
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*newPosition = _virtPos;
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return Stream->Seek(Offset + _virtPos, STREAM_SEEK_SET, NULL);
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}
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STDMETHODIMP CTailOutStream::SetSize(UInt64 newSize)
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{
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_virtSize = newSize;
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return Stream->SetSize(Offset + newSize);
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}
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