1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkIStream_DEFINED 11 #define SkIStream_DEFINED 12 13 #include "include/core/SkTypes.h" 14 15 #ifdef SK_BUILD_FOR_WIN 16 17 #include "src/core/SkLeanWindows.h" 18 #include "src/utils/win/SkObjBase.h" 19 #include <ole2.h> 20 21 class SkStream; 22 class SkWStream; 23 24 /** 25 * A bare IStream implementation which properly reference counts 26 * but returns E_NOTIMPL for all ISequentialStream and IStream methods. 27 */ 28 class SkBaseIStream : public IStream { 29 public: 30 // IUnknown methods 31 SK_STDMETHODIMP QueryInterface(REFIID iid, void ** ppvObject) override; 32 SK_STDMETHODIMP_(ULONG) AddRef() override; 33 SK_STDMETHODIMP_(ULONG) Release() override; 34 35 // ISequentialStream methods 36 SK_STDMETHODIMP Read(void* pv, ULONG cb, ULONG* pcbRead) override; 37 SK_STDMETHODIMP Write(void const* pv, ULONG cb, ULONG* pcbWritten) override; 38 39 // IStream methods 40 SK_STDMETHODIMP SetSize(ULARGE_INTEGER) override; 41 SK_STDMETHODIMP CopyTo(IStream*, ULARGE_INTEGER, ULARGE_INTEGER*, ULARGE_INTEGER*) override; 42 SK_STDMETHODIMP Commit(DWORD) override; 43 SK_STDMETHODIMP Revert() override; 44 SK_STDMETHODIMP LockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) override; 45 SK_STDMETHODIMP UnlockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) override; 46 SK_STDMETHODIMP Clone(IStream**) override; 47 SK_STDMETHODIMP Seek(LARGE_INTEGER liDistanceToMove, 48 DWORD dwOrigin, 49 ULARGE_INTEGER* lpNewFilePointer) override; 50 SK_STDMETHODIMP Stat(STATSTG* pStatstg, DWORD grfStatFlag) override; 51 52 protected: 53 explicit SkBaseIStream(); 54 virtual ~SkBaseIStream(); 55 56 private: 57 LONG _refcount; 58 }; 59 60 /** 61 * A minimal read-only IStream implementation which wraps an SkStream. 62 */ 63 class SkIStream : public SkBaseIStream { 64 public: 65 HRESULT static CreateFromSkStream(SkStream* stream, bool fDeleteOnRelease, IStream** ppStream); 66 67 SK_STDMETHODIMP Read(void* pv, ULONG cb, ULONG* pcbRead) override; 68 SK_STDMETHODIMP Write(void const* pv, ULONG cb, ULONG* pcbWritten) override; 69 SK_STDMETHODIMP Seek(LARGE_INTEGER liDistanceToMove, 70 DWORD dwOrigin, 71 ULARGE_INTEGER* lpNewFilePointer) override; 72 SK_STDMETHODIMP Stat(STATSTG* pStatstg, DWORD grfStatFlag) override; 73 74 private: 75 SkStream *fSkStream; 76 const bool fDeleteOnRelease; 77 ULARGE_INTEGER fLocation; 78 79 SkIStream(SkStream* stream, bool fDeleteOnRelease); 80 ~SkIStream() override; 81 }; 82 83 /** 84 * A minimal write-only IStream implementation which wraps an SkWIStream. 85 */ 86 class SkWIStream : public SkBaseIStream { 87 public: 88 HRESULT static CreateFromSkWStream(SkWStream* stream, IStream ** ppStream); 89 90 SK_STDMETHODIMP Write(void const* pv, ULONG cb, ULONG* pcbWritten) override; 91 SK_STDMETHODIMP Commit(DWORD) override; 92 SK_STDMETHODIMP Stat(STATSTG* pStatstg, DWORD grfStatFlag) override; 93 94 private: 95 SkWStream *fSkWStream; 96 97 SkWIStream(SkWStream* stream); 98 ~SkWIStream() override; 99 }; 100 101 #endif // SK_BUILD_FOR_WIN 102 #endif // SkIStream_DEFINED 103