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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     // 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 
     57 PassRefPtr<SharedBuffer> SharedBuffer::wrapCFData(CFDataRef data)
     58 {
     59     return adoptRef(new SharedBuffer(data));
     60 }
     61 
     62 bool SharedBuffer::hasPlatformData() const
     63 {
     64     return m_cfData;
     65 }
     66 
     67 const char* SharedBuffer::platformData() const
     68 {
     69     return (const char*)CFDataGetBytePtr(m_cfData.get());
     70 }
     71 
     72 unsigned SharedBuffer::platformDataSize() const
     73 {
     74     return CFDataGetLength(m_cfData.get());
     75 }
     76 
     77 void 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 
     89 void SharedBuffer::clearPlatformData()
     90 {
     91     m_cfData = 0;
     92 }
     93 
     94 #if HAVE(CFNETWORK_DATA_ARRAY_CALLBACK)
     95 void SharedBuffer::append(CFDataRef data)
     96 {
     97     ASSERT(data);
     98     m_dataArray.append(data);
     99     m_size += CFDataGetLength(data);
    100 }
    101 
    102 void 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