blob: 757e51cad2d95f7e4c3ae6a053a3fd707b5eeb35 [file] [log] [blame]
/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebKitDLL.h"
#include "MemoryStream.h"
using std::min;
using namespace WebCore;
// MemoryStream ---------------------------------------------------------------
MemoryStream::MemoryStream(PassRefPtr<SharedBuffer> buffer)
: m_refCount(0)
, m_buffer(buffer)
, m_pos(0)
{
gClassCount++;
gClassNameCount.add("MemoryStream");
}
MemoryStream::~MemoryStream()
{
gClassCount--;
gClassNameCount.remove("MemoryStream");
}
COMPtr<MemoryStream> MemoryStream::createInstance(PassRefPtr<SharedBuffer> buffer)
{
return new MemoryStream(buffer);
}
// IUnknown -------------------------------------------------------------------
HRESULT STDMETHODCALLTYPE MemoryStream::QueryInterface(REFIID riid, void** ppvObject)
{
*ppvObject = 0;
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 STDMETHODCALLTYPE MemoryStream::AddRef(void)
{
return ++m_refCount;
}
ULONG STDMETHODCALLTYPE MemoryStream::Release(void)
{
ULONG newRef = --m_refCount;
if (!newRef)
delete(this);
return newRef;
}
// ISequentialStream ----------------------------------------------------------
HRESULT STDMETHODCALLTYPE MemoryStream::Read(
/* [length_is][size_is][out] */ void* pv,
/* [in] */ ULONG cb,
/* [out] */ 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 STDMETHODCALLTYPE MemoryStream::Write(
/* [size_is][in] */ const void* /*pv*/,
/* [in] */ ULONG /*cb*/,
/* [out] */ ULONG* /*pcbWritten*/)
{
// we use this for read-only streams
return STG_E_ACCESSDENIED;
}
// IStream --------------------------------------------------------------------
HRESULT STDMETHODCALLTYPE MemoryStream::Seek(
/* [in] */ LARGE_INTEGER dlibMove,
/* [in] */ DWORD dwOrigin,
/* [out] */ 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 STDMETHODCALLTYPE MemoryStream::SetSize(
/* [in] */ ULARGE_INTEGER /*libNewSize*/)
{
return STG_E_INVALIDFUNCTION;
}
HRESULT STDMETHODCALLTYPE MemoryStream::CopyTo(
/* [unique][in] */ IStream* pstm,
/* [in] */ ULARGE_INTEGER cb,
/* [out] */ ULARGE_INTEGER* pcbRead,
/* [out] */ ULARGE_INTEGER* pcbWritten)
{
if (!m_buffer)
return E_FAIL;
if (cb.HighPart) {
cb.HighPart = 0;
cb.LowPart = (DWORD)-1;
}
ULONG written;
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 STDMETHODCALLTYPE MemoryStream::Commit(
/* [in] */ DWORD /*grfCommitFlags*/)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE MemoryStream::Revert( void)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE MemoryStream::LockRegion(
/* [in] */ ULARGE_INTEGER /*libOffset*/,
/* [in] */ ULARGE_INTEGER /*cb*/,
/* [in] */ DWORD /*dwLockType*/)
{
return STG_E_INVALIDFUNCTION;
}
HRESULT STDMETHODCALLTYPE MemoryStream::UnlockRegion(
/* [in] */ ULARGE_INTEGER /*libOffset*/,
/* [in] */ ULARGE_INTEGER /*cb*/,
/* [in] */ DWORD /*dwLockType*/)
{
return STG_E_INVALIDFUNCTION;
}
HRESULT STDMETHODCALLTYPE MemoryStream::Stat(
/* [out] */ STATSTG* pstatstg,
/* [in] */ DWORD /*grfStatFlag*/)
{
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 STDMETHODCALLTYPE MemoryStream::Clone(
/* [out] */ IStream** ppstm)
{
MemoryStream::createInstance(m_buffer).copyRefTo(ppstm);
// FIXME: MSDN says we should be returning STG_E_INSUFFICIENT_MEMORY instead of E_OUTOFMEMORY here.
return (*ppstm) ? S_OK : E_OUTOFMEMORY;
}