1/*
2 * Copyright (C) 2008, 2010 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#include "config.h"
29#include "SharedBuffer.h"
30
31#include "PurgeableBuffer.h"
32
33namespace WebCore {
34
35SharedBuffer::SharedBuffer(CFDataRef cfData)
36    : m_size(0)
37    , m_cfData(cfData)
38{
39}
40
41// Mac is a CF platform but has an even more efficient version of this method,
42// so only use this version for non-Mac
43#if !PLATFORM(MAC)
44CFDataRef SharedBuffer::createCFData()
45{
46    if (m_cfData) {
47        CFRetain(m_cfData.get());
48        return m_cfData.get();
49    }
50
51    // Internal data in SharedBuffer can be segmented. We need to get the contiguous buffer.
52    const Vector<char>& contiguousBuffer = buffer();
53    return CFDataCreate(0, reinterpret_cast<const UInt8*>(contiguousBuffer.data()), contiguousBuffer.size());
54}
55#endif
56
57PassRefPtr<SharedBuffer> SharedBuffer::wrapCFData(CFDataRef data)
58{
59    return adoptRef(new SharedBuffer(data));
60}
61
62bool SharedBuffer::hasPlatformData() const
63{
64    return m_cfData;
65}
66
67const char* SharedBuffer::platformData() const
68{
69    return (const char*)CFDataGetBytePtr(m_cfData.get());
70}
71
72unsigned SharedBuffer::platformDataSize() const
73{
74    return CFDataGetLength(m_cfData.get());
75}
76
77void SharedBuffer::maybeTransferPlatformData()
78{
79    if (!m_cfData)
80        return;
81
82    ASSERT(!m_size);
83
84    append((const char*)CFDataGetBytePtr(m_cfData.get()), CFDataGetLength(m_cfData.get()));
85
86    m_cfData = 0;
87}
88
89void SharedBuffer::clearPlatformData()
90{
91    m_cfData = 0;
92}
93
94#if HAVE(CFNETWORK_DATA_ARRAY_CALLBACK)
95void SharedBuffer::append(CFDataRef data)
96{
97    ASSERT(data);
98    m_dataArray.append(data);
99    m_size += CFDataGetLength(data);
100}
101
102void SharedBuffer::copyDataArrayAndClear(char *destination, unsigned bytesToCopy) const
103{
104    if (m_dataArray.isEmpty())
105        return;
106
107    CFIndex bytesLeft = bytesToCopy;
108    Vector<RetainPtr<CFDataRef> >::const_iterator end = m_dataArray.end();
109    for (Vector<RetainPtr<CFDataRef> >::const_iterator it = m_dataArray.begin(); it != end; ++it) {
110        CFIndex dataLen = CFDataGetLength(it->get());
111        ASSERT(bytesLeft >= dataLen);
112        memcpy(destination, CFDataGetBytePtr(it->get()), dataLen);
113        destination += dataLen;
114        bytesLeft -= dataLen;
115    }
116    m_dataArray.clear();
117}
118#endif
119
120}
121