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// LimitedStreams.cpp
#include "StdAfx.h"
#include <string.h>
#include "LimitedStreams.h"
STDMETHODIMP CLimitedSequentialInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize = 0;
{
const UInt64 rem = _size - _pos;
if (size > rem)
size = (UInt32)rem;
}
HRESULT result = S_OK;
if (size != 0)
{
result = _stream->Read(data, size, &realProcessedSize);
_pos += realProcessedSize;
if (realProcessedSize == 0)
_wasFinished = true;
}
if (processedSize)
*processedSize = realProcessedSize;
return result;
}
STDMETHODIMP CLimitedInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (_virtPos >= _size)
{
// 9.31: Fixed. Windows doesn't return error in ReadFile and IStream->Read in that case.
return S_OK;
// return (_virtPos == _size) ? S_OK: E_FAIL; // ERROR_HANDLE_EOF
}
{
const UInt64 rem = _size - _virtPos;
if (size > rem)
size = (UInt32)rem;
}
UInt64 newPos = _startOffset + _virtPos;
if (newPos != _physPos)
{
_physPos = newPos;
RINOK(SeekToPhys());
}
HRESULT res = _stream->Read(data, size, &size);
if (processedSize)
*processedSize = size;
_physPos += size;
_virtPos += size;
return res;
}
STDMETHODIMP CLimitedInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END: offset += _size; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = offset;
if (newPosition)
*newPosition = _virtPos;
return S_OK;
}
HRESULT CreateLimitedInStream(IInStream *inStream, UInt64 pos, UInt64 size, ISequentialInStream **resStream)
{
*resStream = 0;
CLimitedInStream *streamSpec = new CLimitedInStream;
CMyComPtr<ISequentialInStream> streamTemp = streamSpec;
streamSpec->SetStream(inStream);
RINOK(streamSpec->InitAndSeek(pos, size));
streamSpec->SeekToStart();
*resStream = streamTemp.Detach();
return S_OK;
}
STDMETHODIMP CClusterInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (_virtPos >= Size)
return S_OK;
{
UInt64 rem = Size - _virtPos;
if (size > rem)
size = (UInt32)rem;
}
if (size == 0)
return S_OK;
if (_curRem == 0)
{
const UInt32 blockSize = (UInt32)1 << BlockSizeLog;
const UInt32 virtBlock = (UInt32)(_virtPos >> BlockSizeLog);
const UInt32 offsetInBlock = (UInt32)_virtPos & (blockSize - 1);
const UInt32 phyBlock = Vector[virtBlock];
UInt64 newPos = StartOffset + ((UInt64)phyBlock << BlockSizeLog) + offsetInBlock;
if (newPos != _physPos)
{
_physPos = newPos;
RINOK(SeekToPhys());
}
_curRem = blockSize - offsetInBlock;
for (int i = 1; i < 64 && (virtBlock + i) < (UInt32)Vector.Size() && phyBlock + i == Vector[virtBlock + i]; i++)
_curRem += (UInt32)1 << BlockSizeLog;
}
if (size > _curRem)
size = _curRem;
HRESULT res = Stream->Read(data, size, &size);
if (processedSize)
*processedSize = size;
_physPos += size;
_virtPos += size;
_curRem -= size;
return res;
}
STDMETHODIMP CClusterInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END: offset += Size; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
if (_virtPos != (UInt64)offset)
_curRem = 0;
_virtPos = offset;
if (newPosition)
*newPosition = offset;
return S_OK;
}
STDMETHODIMP CExtentsStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (_virtPos >= Extents.Back().Virt)
return S_OK;
if (size == 0)
return S_OK;
unsigned left = 0, right = Extents.Size() - 1;
for (;;)
{
unsigned mid = (left + right) / 2;
if (mid == left)
break;
if (_virtPos < Extents[mid].Virt)
right = mid;
else
left = mid;
}
const CSeekExtent &extent = Extents[left];
UInt64 phyPos = extent.Phy + (_virtPos - extent.Virt);
if (_needStartSeek || _phyPos != phyPos)
{
_needStartSeek = false;
_phyPos = phyPos;
RINOK(SeekToPhys());
}
UInt64 rem = Extents[left + 1].Virt - _virtPos;
if (size > rem)
size = (UInt32)rem;
HRESULT res = Stream->Read(data, size, &size);
_phyPos += size;
_virtPos += size;
if (processedSize)
*processedSize = size;
return res;
}
STDMETHODIMP CExtentsStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END: offset += Extents.Back().Virt; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = offset;
if (newPosition)
*newPosition = _virtPos;
return S_OK;
}
STDMETHODIMP CLimitedSequentialOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
HRESULT result = S_OK;
if (processedSize)
*processedSize = 0;
if (size > _size)
{
if (_size == 0)
{
_overflow = true;
if (!_overflowIsAllowed)
return E_FAIL;
if (processedSize)
*processedSize = size;
return S_OK;
}
size = (UInt32)_size;
}
if (_stream)
result = _stream->Write(data, size, &size);
_size -= size;
if (processedSize)
*processedSize = size;
return result;
}
STDMETHODIMP CTailInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 cur;
HRESULT res = Stream->Read(data, size, &cur);
if (processedSize)
*processedSize = cur;
_virtPos += cur;
return res;
}
STDMETHODIMP CTailInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END:
{
UInt64 pos = 0;
RINOK(Stream->Seek(offset, STREAM_SEEK_END, &pos));
if (pos < Offset)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = pos - Offset;
if (newPosition)
*newPosition = _virtPos;
return S_OK;
}
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = offset;
if (newPosition)
*newPosition = _virtPos;
return Stream->Seek(Offset + _virtPos, STREAM_SEEK_SET, NULL);
}
STDMETHODIMP CLimitedCachedInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (_virtPos >= _size)
{
// 9.31: Fixed. Windows doesn't return error in ReadFile and IStream->Read in that case.
return S_OK;
// return (_virtPos == _size) ? S_OK: E_FAIL; // ERROR_HANDLE_EOF
}
UInt64 rem = _size - _virtPos;
if (rem < size)
size = (UInt32)rem;
UInt64 newPos = _startOffset + _virtPos;
UInt64 offsetInCache = newPos - _cachePhyPos;
HRESULT res = S_OK;
if (newPos >= _cachePhyPos &&
offsetInCache <= _cacheSize &&
size <= _cacheSize - (size_t)offsetInCache)
{
if (size != 0)
memcpy(data, _cache + (size_t)offsetInCache, size);
}
else
{
if (newPos != _physPos)
{
_physPos = newPos;
RINOK(SeekToPhys());
}
res = _stream->Read(data, size, &size);
_physPos += size;
}
if (processedSize)
*processedSize = size;
_virtPos += size;
return res;
}
STDMETHODIMP CLimitedCachedInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END: offset += _size; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = offset;
if (newPosition)
*newPosition = _virtPos;
return S_OK;
}
STDMETHODIMP CTailOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 cur;
HRESULT res = Stream->Write(data, size, &cur);
if (processedSize)
*processedSize = cur;
_virtPos += cur;
if (_virtSize < _virtPos)
_virtSize = _virtPos;
return res;
}
STDMETHODIMP CTailOutStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch (seekOrigin)
{
case STREAM_SEEK_SET: break;
case STREAM_SEEK_CUR: offset += _virtPos; break;
case STREAM_SEEK_END: offset += _virtSize; break;
default: return STG_E_INVALIDFUNCTION;
}
if (offset < 0)
return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
_virtPos = offset;
if (newPosition)
*newPosition = _virtPos;
return Stream->Seek(Offset + _virtPos, STREAM_SEEK_SET, NULL);
}
STDMETHODIMP CTailOutStream::SetSize(UInt64 newSize)
{
_virtSize = newSize;
return Stream->SetSize(Offset + newSize);
}
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