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      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 
     33 namespace WebCore {
     34 
     35 SharedBuffer::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)
     44 CFDataRef SharedBuffer::createCFData()
     45 {
     46     if (m_cfData) {
     47         CFRetain(m_cfData.get());
     48         return m_cfData.get();
     49     }
     50 
     51     return CFDataCreate(0, reinterpret_cast<const UInt8*>(m_buffer.data()), m_buffer.size());
     52 }
     53 #endif
     54 
     55 PassRefPtr<SharedBuffer> SharedBuffer::wrapCFData(CFDataRef data)
     56 {
     57     return adoptRef(new SharedBuffer(data));
     58 }
     59 
     60 bool SharedBuffer::hasPlatformData() const
     61 {
     62     return m_cfData;
     63 }
     64 
     65 const char* SharedBuffer::platformData() const
     66 {
     67     return (const char*)CFDataGetBytePtr(m_cfData.get());
     68 }
     69 
     70 unsigned SharedBuffer::platformDataSize() const
     71 {
     72     return CFDataGetLength(m_cfData.get());
     73 }
     74 
     75 void SharedBuffer::maybeTransferPlatformData()
     76 {
     77     if (!m_cfData)
     78         return;
     79 
     80     ASSERT(!m_size);
     81 
     82     append((const char*)CFDataGetBytePtr(m_cfData.get()), CFDataGetLength(m_cfData.get()));
     83 
     84     m_cfData = 0;
     85 }
     86 
     87 void SharedBuffer::clearPlatformData()
     88 {
     89     m_cfData = 0;
     90 }
     91 
     92 }
     93