1/*
2 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef MemoryStream_H
27#define MemoryStream_H
28
29#include <objidl.h>
30
31#include <WebCore/COMPtr.h>
32#include <WebCore/SharedBuffer.h>
33#include <WTF/PassRefPtr.h>
34#include <WTF/RefPtr.h>
35
36class MemoryStream : public IStream
37{
38public:
39    static COMPtr<MemoryStream> createInstance(PassRefPtr<WebCore::SharedBuffer> buffer);
40
41protected:
42    MemoryStream(PassRefPtr<WebCore::SharedBuffer> buffer);
43    ~MemoryStream();
44public:
45
46    // IUnknown
47    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppvObject);
48    virtual ULONG STDMETHODCALLTYPE AddRef(void);
49    virtual ULONG STDMETHODCALLTYPE Release(void);
50
51    // ISequentialStream
52    virtual /* [local] */ HRESULT STDMETHODCALLTYPE Read(
53        /* [length_is][size_is][out] */ void* pv,
54        /* [in] */ ULONG cb,
55        /* [out] */ ULONG* pcbRead);
56
57    virtual /* [local] */ HRESULT STDMETHODCALLTYPE Write(
58        /* [size_is][in] */ const void* pv,
59        /* [in] */ ULONG cb,
60        /* [out] */ ULONG* pcbWritten);
61
62    // IStream
63    virtual /* [local] */ HRESULT STDMETHODCALLTYPE Seek(
64        /* [in] */ LARGE_INTEGER dlibMove,
65        /* [in] */ DWORD dwOrigin,
66        /* [out] */ ULARGE_INTEGER* plibNewPosition);
67
68    virtual HRESULT STDMETHODCALLTYPE SetSize(
69        /* [in] */ ULARGE_INTEGER libNewSize);
70
71    virtual /* [local] */ HRESULT STDMETHODCALLTYPE CopyTo(
72        /* [unique][in] */ IStream* pstm,
73        /* [in] */ ULARGE_INTEGER cb,
74        /* [out] */ ULARGE_INTEGER* pcbRead,
75        /* [out] */ ULARGE_INTEGER* pcbWritten);
76
77    virtual HRESULT STDMETHODCALLTYPE Commit(
78        /* [in] */ DWORD grfCommitFlags);
79
80    virtual HRESULT STDMETHODCALLTYPE Revert( void);
81
82    virtual HRESULT STDMETHODCALLTYPE LockRegion(
83        /* [in] */ ULARGE_INTEGER libOffset,
84        /* [in] */ ULARGE_INTEGER cb,
85        /* [in] */ DWORD dwLockType);
86
87    virtual HRESULT STDMETHODCALLTYPE UnlockRegion(
88        /* [in] */ ULARGE_INTEGER libOffset,
89        /* [in] */ ULARGE_INTEGER cb,
90        /* [in] */ DWORD dwLockType);
91
92    virtual HRESULT STDMETHODCALLTYPE Stat(
93        /* [out] */ STATSTG* pstatstg,
94        /* [in] */ DWORD grfStatFlag);
95
96    virtual HRESULT STDMETHODCALLTYPE Clone(
97        /* [out] */ IStream** ppstm);
98
99protected:
100    ULONG m_refCount;
101    RefPtr<WebCore::SharedBuffer> m_buffer;
102    size_t m_pos;
103};
104
105#endif
106