125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
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// NilXForm.cpp -- Implementation of the Null Transform Instance
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#include "stdafx.h"
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HRESULT CNull_TransformInstance::CreateFromILockBytes
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(IUnknown *pUnkOuter, ILockBytes *pLKB, ITransformInstance **ppTransformInstance)
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{
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CNull_TransformInstance *pNT = New CNull_TransformInstance(pUnkOuter);
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return FinishSetup(pNT? pNT->m_ImpITransformInstance.InitFromLockBytes(pLKB)
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: STG_E_INSUFFICIENTMEMORY,
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pNT, IID_ITransformInstance, (PPVOID) ppTransformInstance
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);
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}
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CNull_TransformInstance::CImpITransformInstance::CImpITransformInstance
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(CNull_TransformInstance *pBackObj, IUnknown *punkOuter)
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: IITTransformInstance(pBackObj, punkOuter)
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{
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m_pLKB = NULL;
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m_cbSpaceSize = 0;
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}
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CNull_TransformInstance::CImpITransformInstance::~CImpITransformInstance()
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{
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if (m_pLKB)
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{
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m_pLKB->Flush();
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m_pLKB->Release();
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}
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}
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HRESULT CNull_TransformInstance::CImpITransformInstance::InitFromLockBytes(ILockBytes *pLKB)
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{
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m_pLKB = pLKB;
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STATSTG statstg;
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HRESULT hr = m_pLKB->Stat(&statstg, STATFLAG_NONAME);
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if (SUCCEEDED(hr))
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m_cbSpaceSize = statstg.cbSize;
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return hr;
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}
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// ITransformInstance interfaces:
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HRESULT STDMETHODCALLTYPE CNull_TransformInstance::CImpITransformInstance::ReadAt
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(ULARGE_INTEGER uliOffset, void *pv, ULONG cb, ULONG *pcbRead,
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ImageSpan *pSpan
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)
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{
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HRESULT hr = m_pLKB->ReadAt((CULINT(uliOffset) + CULINT(pSpan->uliHandle)).Uli(),
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pv,cb, pcbRead
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);
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return hr;
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}
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HRESULT STDMETHODCALLTYPE CNull_TransformInstance::CImpITransformInstance::WriteAt
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(ULARGE_INTEGER ulOffset, const void *pv, ULONG cb, ULONG *pcbWritten,
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ImageSpan *pSpan
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)
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{
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RonM_ASSERT(m_pLKB);
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CULINT ullOffset, ullSize, ullWriteOffset, ullWriteLimit, ullReadEOS;
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ullOffset = pSpan->uliHandle;
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ullSize = pSpan->uliSize;
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ullReadEOS = ullOffset + ullSize;
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ullWriteOffset = ullOffset + ulOffset;
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ullWriteLimit = ullWriteOffset + cb;
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CSyncWith sw(g_csITFS);
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if (ullWriteOffset != ullReadEOS || (ullReadEOS.NonZero() && ullWriteOffset > ullReadEOS))
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return STG_E_INVALIDPARAMETER;
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if (ullWriteLimit < ullWriteOffset) // Wrapped around 64-bit address space?
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ullWriteLimit = 0;
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HRESULT hr = m_pLKB->WriteAt(ullWriteOffset.Uli(), pv,
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(ullWriteLimit - ullWriteOffset).Uli().LowPart,
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pcbWritten
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);
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ullWriteLimit = ullWriteOffset + *pcbWritten;
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if (m_cbSpaceSize < ullWriteLimit)
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m_cbSpaceSize = ullWriteLimit;
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CULINT ullSizeNew;
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ullSizeNew = ullWriteLimit - ullWriteOffset;
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if (SUCCEEDED(hr))
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pSpan->uliSize = (CULINT(pSpan->uliSize) + CULINT(*pcbWritten)).Uli();
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return hr;
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}
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HRESULT STDMETHODCALLTYPE CNull_TransformInstance::CImpITransformInstance::Flush()
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{
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RonM_ASSERT(m_pLKB);
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return m_pLKB->Flush();
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}
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HRESULT CNull_TransformInstance::CImpITransformInstance::SpaceSize(ULARGE_INTEGER *puliSize)
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{
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RonM_ASSERT(m_pLKB);
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*puliSize = m_cbSpaceSize.Uli();
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return NO_ERROR;
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}
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