#include "WebKitDLL.h"
#include "MemoryStream.h"
using std::min;
using namespace WebCore;
MemoryStream::MemoryStream(RefPtr<SharedBuffer>&& buffer)
: m_buffer(WTFMove(buffer))
{
gClassCount++;
gClassNameCount().add("MemoryStream");
}
MemoryStream::~MemoryStream()
{
gClassCount--;
gClassNameCount().remove("MemoryStream");
}
COMPtr<MemoryStream> MemoryStream::createInstance(RefPtr<SharedBuffer>&& buffer)
{
return new MemoryStream(WTFMove(buffer));
}
HRESULT MemoryStream::QueryInterface(_In_ REFIID riid, _COM_Outptr_ void** ppvObject)
{
if (!ppvObject)
return E_POINTER;
*ppvObject = nullptr;
if (IsEqualGUID(riid, IID_IUnknown))
*ppvObject = static_cast<IUnknown*>(this);
else if (IsEqualGUID(riid, IID_ISequentialStream))
*ppvObject = static_cast<ISequentialStream*>(this);
else if (IsEqualGUID(riid, IID_IStream))
*ppvObject = static_cast<IStream*>(this);
else
return E_NOINTERFACE;
AddRef();
return S_OK;
}
ULONG MemoryStream::AddRef()
{
return ++m_refCount;
}
ULONG MemoryStream::Release()
{
ULONG newRef = --m_refCount;
if (!newRef)
delete(this);
return newRef;
}
HRESULT MemoryStream::Read( void* pv, ULONG cb, ULONG* pcbRead)
{
*pcbRead = 0;
if (!m_buffer)
return E_FAIL;
if (m_pos >= m_buffer->size())
return S_FALSE;
if (m_pos + cb < m_buffer->size())
*pcbRead = cb;
else
*pcbRead = (ULONG) (m_buffer->size() - m_pos);
memcpy(pv, m_buffer->data() + m_pos, *pcbRead);
m_pos += *pcbRead;
return S_OK;
}
HRESULT MemoryStream::Write( const void* , ULONG , ULONG* )
{
return STG_E_ACCESSDENIED;
}
HRESULT MemoryStream::Seek( LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
{
if (!m_buffer)
return E_FAIL;
size_t proposedPos = m_pos;
size_t lowPartNeg;
switch (dwOrigin) {
case STREAM_SEEK_SET:
proposedPos = dlibMove.LowPart;
if (dlibMove.HighPart)
return E_FAIL;
break;
case STREAM_SEEK_CUR:
if (!dlibMove.HighPart) {
if (dlibMove.LowPart > (m_buffer->size() - m_pos))
return E_FAIL;
proposedPos += dlibMove.LowPart;
} else if (dlibMove.HighPart == -1) {
lowPartNeg = (~dlibMove.LowPart)+1;
if (lowPartNeg > m_pos)
return E_FAIL;
proposedPos = m_pos - lowPartNeg;
} else
return E_FAIL;
break;
case STREAM_SEEK_END:
if (dlibMove.HighPart != -1)
return E_FAIL;
lowPartNeg = (~dlibMove.LowPart)+1;
if (lowPartNeg > m_buffer->size())
return E_FAIL;
proposedPos = m_buffer->size() - lowPartNeg;
break;
default:
return E_FAIL;
}
if (proposedPos >= m_buffer->size())
return E_FAIL;
if (plibNewPosition) {
plibNewPosition->HighPart = 0;
plibNewPosition->LowPart = (DWORD) m_pos;
}
return S_OK;
}
HRESULT MemoryStream::SetSize(ULARGE_INTEGER )
{
return STG_E_INVALIDFUNCTION;
}
HRESULT MemoryStream::CopyTo( IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
{
if (!m_buffer)
return E_FAIL;
if (cb.HighPart) {
cb.HighPart = 0;
cb.LowPart = (DWORD)-1;
}
ULONG written = 0;
ULONG read = min(cb.LowPart, (ULONG)(m_buffer->size()-m_pos));
HRESULT hr = pstm->Write(m_buffer->data()+m_pos, read, &written);
if (pcbWritten) {
pcbWritten->HighPart = 0;
pcbWritten->LowPart = written;
}
if (pcbRead) {
pcbRead->HighPart = 0;
pcbRead->LowPart = read;
}
return hr;
}
HRESULT MemoryStream::Commit(DWORD )
{
return S_OK;
}
HRESULT MemoryStream::Revert()
{
return S_OK;
}
HRESULT MemoryStream::LockRegion(ULARGE_INTEGER , ULARGE_INTEGER , DWORD )
{
return STG_E_INVALIDFUNCTION;
}
HRESULT MemoryStream::UnlockRegion(ULARGE_INTEGER , ULARGE_INTEGER , DWORD )
{
return STG_E_INVALIDFUNCTION;
}
HRESULT MemoryStream::Stat(_Out_ STATSTG* pstatstg, DWORD )
{
if (!pstatstg)
return E_POINTER;
if (!m_buffer)
return E_FAIL;
memset(pstatstg, 0, sizeof(STATSTG));
pstatstg->type = STGTY_STREAM;
pstatstg->cbSize.LowPart = (DWORD) m_buffer->size();
return S_OK;
}
HRESULT MemoryStream::Clone(_COM_Outptr_ IStream** ppstm)
{
MemoryStream::createInstance(m_buffer.copyRef()).copyRefTo(ppstm);
return (*ppstm) ? S_OK : E_OUTOFMEMORY;
}