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 #include "config.h"
27 #include "WebKitDLL.h"
28 #include "MemoryStream.h"
29
30 using std::min;
31 using namespace WebCore;
32
33 // MemoryStream ---------------------------------------------------------------
34
MemoryStream(PassRefPtr<SharedBuffer> buffer)35 MemoryStream::MemoryStream(PassRefPtr<SharedBuffer> buffer)
36 : m_refCount(0)
37 , m_buffer(buffer)
38 , m_pos(0)
39 {
40 gClassCount++;
41 gClassNameCount.add("MemoryStream");
42 }
43
~MemoryStream()44 MemoryStream::~MemoryStream()
45 {
46 gClassCount--;
47 gClassNameCount.remove("MemoryStream");
48 }
49
createInstance(PassRefPtr<SharedBuffer> buffer)50 COMPtr<MemoryStream> MemoryStream::createInstance(PassRefPtr<SharedBuffer> buffer)
51 {
52 return new MemoryStream(buffer);
53 }
54
55 // IUnknown -------------------------------------------------------------------
56
QueryInterface(REFIID riid,void ** ppvObject)57 HRESULT STDMETHODCALLTYPE MemoryStream::QueryInterface(REFIID riid, void** ppvObject)
58 {
59 *ppvObject = 0;
60 if (IsEqualGUID(riid, IID_IUnknown))
61 *ppvObject = static_cast<IUnknown*>(this);
62 else if (IsEqualGUID(riid, IID_ISequentialStream))
63 *ppvObject = static_cast<ISequentialStream*>(this);
64 else if (IsEqualGUID(riid, IID_IStream))
65 *ppvObject = static_cast<IStream*>(this);
66 else
67 return E_NOINTERFACE;
68
69 AddRef();
70 return S_OK;
71 }
72
AddRef(void)73 ULONG STDMETHODCALLTYPE MemoryStream::AddRef(void)
74 {
75 return ++m_refCount;
76 }
77
Release(void)78 ULONG STDMETHODCALLTYPE MemoryStream::Release(void)
79 {
80 ULONG newRef = --m_refCount;
81 if (!newRef)
82 delete(this);
83
84 return newRef;
85 }
86
87 // ISequentialStream ----------------------------------------------------------
88
Read(void * pv,ULONG cb,ULONG * pcbRead)89 HRESULT STDMETHODCALLTYPE MemoryStream::Read(
90 /* [length_is][size_is][out] */ void* pv,
91 /* [in] */ ULONG cb,
92 /* [out] */ ULONG* pcbRead)
93 {
94 *pcbRead = 0;
95
96 if (!m_buffer)
97 return E_FAIL;
98
99 if (m_pos >= m_buffer->size())
100 return S_FALSE;
101
102 if (m_pos + cb < m_buffer->size())
103 *pcbRead = cb;
104 else
105 *pcbRead = (ULONG) (m_buffer->size() - m_pos);
106
107 memcpy(pv, m_buffer->data() + m_pos, *pcbRead);
108 m_pos += *pcbRead;
109
110 return S_OK;
111 }
112
Write(const void *,ULONG,ULONG *)113 HRESULT STDMETHODCALLTYPE MemoryStream::Write(
114 /* [size_is][in] */ const void* /*pv*/,
115 /* [in] */ ULONG /*cb*/,
116 /* [out] */ ULONG* /*pcbWritten*/)
117 {
118 // we use this for read-only streams
119 return STG_E_ACCESSDENIED;
120 }
121
122 // IStream --------------------------------------------------------------------
123
Seek(LARGE_INTEGER dlibMove,DWORD dwOrigin,ULARGE_INTEGER * plibNewPosition)124 HRESULT STDMETHODCALLTYPE MemoryStream::Seek(
125 /* [in] */ LARGE_INTEGER dlibMove,
126 /* [in] */ DWORD dwOrigin,
127 /* [out] */ ULARGE_INTEGER* plibNewPosition)
128 {
129 if (!m_buffer)
130 return E_FAIL;
131
132 size_t proposedPos = m_pos;
133 size_t lowPartNeg;
134 switch (dwOrigin) {
135 case STREAM_SEEK_SET:
136 proposedPos = dlibMove.LowPart;
137 if (dlibMove.HighPart)
138 return E_FAIL;
139 break;
140 case STREAM_SEEK_CUR:
141 if (!dlibMove.HighPart) {
142 if (dlibMove.LowPart > (m_buffer->size() - m_pos))
143 return E_FAIL;
144 proposedPos += dlibMove.LowPart;
145 } else if (dlibMove.HighPart == -1) {
146 lowPartNeg = (~dlibMove.LowPart)+1;
147 if (lowPartNeg > m_pos)
148 return E_FAIL;
149 proposedPos = m_pos - lowPartNeg;
150 } else
151 return E_FAIL;
152 break;
153 case STREAM_SEEK_END:
154 if (dlibMove.HighPart != -1)
155 return E_FAIL;
156 lowPartNeg = (~dlibMove.LowPart)+1;
157 if (lowPartNeg > m_buffer->size())
158 return E_FAIL;
159 proposedPos = m_buffer->size() - lowPartNeg;
160 break;
161 default:
162 return E_FAIL;
163 }
164
165 if (proposedPos >= m_buffer->size())
166 return E_FAIL;
167
168 if (plibNewPosition) {
169 plibNewPosition->HighPart = 0;
170 plibNewPosition->LowPart = (DWORD) m_pos;
171 }
172
173 return S_OK;
174 }
175
SetSize(ULARGE_INTEGER)176 HRESULT STDMETHODCALLTYPE MemoryStream::SetSize(
177 /* [in] */ ULARGE_INTEGER /*libNewSize*/)
178 {
179 return STG_E_INVALIDFUNCTION;
180 }
181
CopyTo(IStream * pstm,ULARGE_INTEGER cb,ULARGE_INTEGER * pcbRead,ULARGE_INTEGER * pcbWritten)182 HRESULT STDMETHODCALLTYPE MemoryStream::CopyTo(
183 /* [unique][in] */ IStream* pstm,
184 /* [in] */ ULARGE_INTEGER cb,
185 /* [out] */ ULARGE_INTEGER* pcbRead,
186 /* [out] */ ULARGE_INTEGER* pcbWritten)
187 {
188 if (!m_buffer)
189 return E_FAIL;
190 if (cb.HighPart) {
191 cb.HighPart = 0;
192 cb.LowPart = (DWORD)-1;
193 }
194
195 ULONG written;
196 ULONG read = min(cb.LowPart, (ULONG)(m_buffer->size()-m_pos));
197 HRESULT hr = pstm->Write(m_buffer->data()+m_pos, read, &written);
198 if (pcbWritten) {
199 pcbWritten->HighPart = 0;
200 pcbWritten->LowPart = written;
201 }
202 if (pcbRead) {
203 pcbRead->HighPart = 0;
204 pcbRead->LowPart = read;
205 }
206
207 return hr;
208 }
209
Commit(DWORD)210 HRESULT STDMETHODCALLTYPE MemoryStream::Commit(
211 /* [in] */ DWORD /*grfCommitFlags*/)
212 {
213 return S_OK;
214 }
215
Revert(void)216 HRESULT STDMETHODCALLTYPE MemoryStream::Revert( void)
217 {
218 return S_OK;
219 }
220
LockRegion(ULARGE_INTEGER,ULARGE_INTEGER,DWORD)221 HRESULT STDMETHODCALLTYPE MemoryStream::LockRegion(
222 /* [in] */ ULARGE_INTEGER /*libOffset*/,
223 /* [in] */ ULARGE_INTEGER /*cb*/,
224 /* [in] */ DWORD /*dwLockType*/)
225 {
226 return STG_E_INVALIDFUNCTION;
227 }
228
UnlockRegion(ULARGE_INTEGER,ULARGE_INTEGER,DWORD)229 HRESULT STDMETHODCALLTYPE MemoryStream::UnlockRegion(
230 /* [in] */ ULARGE_INTEGER /*libOffset*/,
231 /* [in] */ ULARGE_INTEGER /*cb*/,
232 /* [in] */ DWORD /*dwLockType*/)
233 {
234 return STG_E_INVALIDFUNCTION;
235 }
236
Stat(STATSTG * pstatstg,DWORD)237 HRESULT STDMETHODCALLTYPE MemoryStream::Stat(
238 /* [out] */ STATSTG* pstatstg,
239 /* [in] */ DWORD /*grfStatFlag*/)
240 {
241 if (!pstatstg)
242 return E_POINTER;
243
244 if (!m_buffer)
245 return E_FAIL;
246
247 memset(pstatstg, 0, sizeof(STATSTG));
248 pstatstg->type = STGTY_STREAM;
249 pstatstg->cbSize.LowPart = (DWORD) m_buffer->size();
250 return S_OK;
251 }
252
Clone(IStream ** ppstm)253 HRESULT STDMETHODCALLTYPE MemoryStream::Clone(
254 /* [out] */ IStream** ppstm)
255 {
256 MemoryStream::createInstance(m_buffer).copyRefTo(ppstm);
257 // FIXME: MSDN says we should be returning STG_E_INSUFFICIENT_MEMORY instead of E_OUTOFMEMORY here.
258 return (*ppstm) ? S_OK : E_OUTOFMEMORY;
259 }
260