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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkIStream_DEFINED
#define SkIStream_DEFINED
#include "SkTypes.h"
#ifdef SK_BUILD_FOR_WIN
#include "SkLeanWindows.h"
#include <ole2.h>
class SkStream;
class SkWStream;
/**
* A bare IStream implementation which properly reference counts
* but returns E_NOTIMPL for all ISequentialStream and IStream methods.
*/
class SkBaseIStream : public IStream {
private:
LONG _refcount;
protected:
explicit SkBaseIStream();
virtual ~SkBaseIStream();
public:
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid
, void ** ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef(void);
virtual ULONG STDMETHODCALLTYPE Release(void);
// ISequentialStream Interface
public:
virtual HRESULT STDMETHODCALLTYPE Read(void* pv, ULONG cb, ULONG* pcbRead);
virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
, ULONG cb
, ULONG* pcbWritten);
// IStream Interface
public:
virtual HRESULT STDMETHODCALLTYPE SetSize(ULARGE_INTEGER);
virtual HRESULT STDMETHODCALLTYPE CopyTo(IStream*
, ULARGE_INTEGER
, ULARGE_INTEGER*
, ULARGE_INTEGER*);
virtual HRESULT STDMETHODCALLTYPE Commit(DWORD);
virtual HRESULT STDMETHODCALLTYPE Revert(void);
virtual HRESULT STDMETHODCALLTYPE LockRegion(ULARGE_INTEGER
, ULARGE_INTEGER
, DWORD);
virtual HRESULT STDMETHODCALLTYPE UnlockRegion(ULARGE_INTEGER
, ULARGE_INTEGER
, DWORD);
virtual HRESULT STDMETHODCALLTYPE Clone(IStream **);
virtual HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER liDistanceToMove
, DWORD dwOrigin
, ULARGE_INTEGER* lpNewFilePointer);
virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
, DWORD grfStatFlag);
};
/**
* A minimal read-only IStream implementation which wraps an SkStream.
*/
class SkIStream : public SkBaseIStream {
private:
SkStream *fSkStream;
const bool fDeleteOnRelease;
ULARGE_INTEGER fLocation;
SkIStream(SkStream* stream, bool fDeleteOnRelease);
virtual ~SkIStream();
public:
HRESULT static CreateFromSkStream(SkStream* stream
, bool fDeleteOnRelease
, IStream ** ppStream);
virtual HRESULT STDMETHODCALLTYPE Read(void* pv, ULONG cb, ULONG* pcbRead);
virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
, ULONG cb
, ULONG* pcbWritten);
virtual HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER liDistanceToMove
, DWORD dwOrigin
, ULARGE_INTEGER* lpNewFilePointer);
virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
, DWORD grfStatFlag);
};
/**
* A minimal write-only IStream implementation which wraps an SkWIStream.
*/
class SkWIStream : public SkBaseIStream {
private:
SkWStream *fSkWStream;
SkWIStream(SkWStream* stream);
virtual ~SkWIStream();
public:
HRESULT static CreateFromSkWStream(SkWStream* stream, IStream ** ppStream);
virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
, ULONG cb
, ULONG* pcbWritten);
virtual HRESULT STDMETHODCALLTYPE Commit(DWORD);
virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
, DWORD grfStatFlag);
};
#endif // SK_BUILD_FOR_WIN
#endif // SkIStream_DEFINED
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