44af7ba4bc
Fix comment, constness of one field, and delete already checks for NULL. TBR=reed@google.com Trivial change to debatably public api. Review URL: https://codereview.chromium.org/868643003
132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkIStream_DEFINED
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#define SkIStream_DEFINED
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <ole2.h>
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class SkStream;
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class SkWStream;
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/**
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* A bare IStream implementation which properly reference counts
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* but returns E_NOTIMPL for all ISequentialStream and IStream methods.
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*/
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class SkBaseIStream : public IStream {
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private:
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LONG _refcount;
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protected:
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explicit SkBaseIStream();
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virtual ~SkBaseIStream();
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public:
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virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid
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, void ** ppvObject);
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virtual ULONG STDMETHODCALLTYPE AddRef(void);
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virtual ULONG STDMETHODCALLTYPE Release(void);
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// ISequentialStream Interface
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public:
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virtual HRESULT STDMETHODCALLTYPE Read(void* pv, ULONG cb, ULONG* pcbRead);
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virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
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, ULONG cb
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, ULONG* pcbWritten);
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// IStream Interface
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public:
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virtual HRESULT STDMETHODCALLTYPE SetSize(ULARGE_INTEGER);
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virtual HRESULT STDMETHODCALLTYPE CopyTo(IStream*
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, ULARGE_INTEGER
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, ULARGE_INTEGER*
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, ULARGE_INTEGER*);
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virtual HRESULT STDMETHODCALLTYPE Commit(DWORD);
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virtual HRESULT STDMETHODCALLTYPE Revert(void);
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virtual HRESULT STDMETHODCALLTYPE LockRegion(ULARGE_INTEGER
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, ULARGE_INTEGER
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, DWORD);
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virtual HRESULT STDMETHODCALLTYPE UnlockRegion(ULARGE_INTEGER
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, ULARGE_INTEGER
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, DWORD);
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virtual HRESULT STDMETHODCALLTYPE Clone(IStream **);
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virtual HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER liDistanceToMove
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, DWORD dwOrigin
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, ULARGE_INTEGER* lpNewFilePointer);
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virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
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, DWORD grfStatFlag);
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};
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/**
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* A minimal read-only IStream implementation which wraps an SkStream.
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*/
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class SkIStream : public SkBaseIStream {
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private:
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SkStream *fSkStream;
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const bool fDeleteOnRelease;
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ULARGE_INTEGER fLocation;
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SkIStream(SkStream* stream, bool fDeleteOnRelease);
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virtual ~SkIStream();
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public:
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HRESULT static CreateFromSkStream(SkStream* stream
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, bool fDeleteOnRelease
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, IStream ** ppStream);
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virtual HRESULT STDMETHODCALLTYPE Read(void* pv, ULONG cb, ULONG* pcbRead);
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virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
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, ULONG cb
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, ULONG* pcbWritten);
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virtual HRESULT STDMETHODCALLTYPE Seek(LARGE_INTEGER liDistanceToMove
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, DWORD dwOrigin
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, ULARGE_INTEGER* lpNewFilePointer);
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virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
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, DWORD grfStatFlag);
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};
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/**
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* A minimal write-only IStream implementation which wraps an SkWIStream.
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*/
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class SkWIStream : public SkBaseIStream {
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private:
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SkWStream *fSkWStream;
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SkWIStream(SkWStream* stream);
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virtual ~SkWIStream();
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public:
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HRESULT static CreateFromSkWStream(SkWStream* stream, IStream ** ppStream);
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virtual HRESULT STDMETHODCALLTYPE Write(void const* pv
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, ULONG cb
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, ULONG* pcbWritten);
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virtual HRESULT STDMETHODCALLTYPE Commit(DWORD);
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virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg
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, DWORD grfStatFlag);
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};
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#endif
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