1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* 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
#define WIN32_LEAN_AND_MEAN
#include <Windows.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 SkIStream.
*/
class SkIStream : public SkBaseIStream {
private:
SkStream *fSkStream;
bool fUnrefOnRelease;
ULARGE_INTEGER fLocation;
SkIStream(SkStream* stream, bool unrefOnRelease);
virtual ~SkIStream();
public:
HRESULT static CreateFromSkStream(SkStream* stream
, bool unrefOnRelease
, 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
|
