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/*
* Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SharedBuffer.h"
#include <wtf/OSAllocator.h>
#include <wtf/cf/TypeCastsCF.h>
namespace WebCore {
SharedBuffer::SharedBuffer(CFDataRef cfData)
: m_buffer(adoptRef(new DataBuffer))
, m_cfData(cfData)
, m_vnodeToken(VNodeTracker::singleton().token())
{
}
// Using Foundation allows for an even more efficient implementation of this function,
// so only use this version for non-Foundation.
#if !USE(FOUNDATION)
RetainPtr<CFDataRef> SharedBuffer::createCFData()
{
if (m_cfData)
return m_cfData;
// Internal data in SharedBuffer can be segmented. We need to get the contiguous buffer.
const Vector<char>& contiguousBuffer = buffer();
return adoptCF(CFDataCreate(0, reinterpret_cast<const UInt8*>(contiguousBuffer.data()), contiguousBuffer.size()));
}
#endif
PassRefPtr<SharedBuffer> SharedBuffer::wrapCFData(CFDataRef data)
{
return adoptRef(new SharedBuffer(data));
}
bool SharedBuffer::hasPlatformData() const
{
return m_cfData;
}
const char* SharedBuffer::platformData() const
{
return reinterpret_cast<const char*>(CFDataGetBytePtr(m_cfData.get()));
}
unsigned SharedBuffer::platformDataSize() const
{
return CFDataGetLength(m_cfData.get());
}
void SharedBuffer::hintMemoryNotNeededSoon()
{
if (!hasPlatformData())
return;
OSAllocator::hintMemoryNotNeededSoon(const_cast<char*>(platformData()), platformDataSize());
}
void SharedBuffer::maybeTransferPlatformData()
{
if (!m_cfData)
return;
ASSERT(!m_size);
// Hang on to the m_cfData pointer in a local pointer as append() will re-enter maybeTransferPlatformData()
// and we need to make sure to early return when it does.
RetainPtr<CFDataRef> cfData = adoptCF(m_cfData.leakRef());
append(reinterpret_cast<const char*>(CFDataGetBytePtr(cfData.get())), CFDataGetLength(cfData.get()));
}
void SharedBuffer::clearPlatformData()
{
m_cfData = 0;
}
bool SharedBuffer::tryReplaceContentsWithPlatformBuffer(SharedBuffer& newContents)
{
if (!newContents.m_cfData)
return false;
clear();
m_cfData = newContents.m_cfData;
return true;
}
bool SharedBuffer::maybeAppendPlatformData(SharedBuffer* newContents)
{
if (size() || !newContents->m_cfData)
return false;
m_cfData = newContents->m_cfData;
return true;
}
#if USE(NETWORK_CFDATA_ARRAY_CALLBACK)
PassRefPtr<SharedBuffer> SharedBuffer::wrapCFDataArray(CFArrayRef cfDataArray)
{
return adoptRef(new SharedBuffer(cfDataArray));
}
SharedBuffer::SharedBuffer(CFArrayRef cfDataArray)
: m_buffer(adoptRef(new DataBuffer))
, m_cfData(nullptr)
{
CFIndex dataArrayCount = CFArrayGetCount(cfDataArray);
for (CFIndex index = 0; index < dataArrayCount; ++index)
append(checked_cf_cast<CFDataRef>(CFArrayGetValueAtIndex(cfDataArray, index)));
}
void SharedBuffer::append(CFDataRef data)
{
ASSERT(data);
m_dataArray.append(data);
m_size += CFDataGetLength(data);
}
void SharedBuffer::copyBufferAndClear(char* destination, unsigned bytesToCopy) const
{
if (m_dataArray.isEmpty())
return;
CFIndex bytesLeft = bytesToCopy;
for (auto& cfData : m_dataArray) {
CFIndex dataLen = CFDataGetLength(cfData.get());
ASSERT(bytesLeft >= dataLen);
memcpy(destination, CFDataGetBytePtr(cfData.get()), dataLen);
destination += dataLen;
bytesLeft -= dataLen;
}
m_dataArray.clear();
}
unsigned SharedBuffer::copySomeDataFromDataArray(const char*& someData, unsigned position) const
{
unsigned totalOffset = 0;
for (auto& cfData : m_dataArray) {
unsigned dataLen = static_cast<unsigned>(CFDataGetLength(cfData.get()));
ASSERT(totalOffset <= position);
unsigned localOffset = position - totalOffset;
if (localOffset < dataLen) {
someData = reinterpret_cast<const char *>(CFDataGetBytePtr(cfData.get())) + localOffset;
return dataLen - localOffset;
}
totalOffset += dataLen;
}
return 0;
}
const char *SharedBuffer::singleDataArrayBuffer() const
{
// If we had previously copied data into m_buffer in copyDataArrayAndClear() or some other
// function, then we can't return a pointer to the CFDataRef buffer.
if (m_buffer->data.size())
return 0;
if (m_dataArray.size() != 1)
return 0;
return reinterpret_cast<const char*>(CFDataGetBytePtr(m_dataArray.at(0).get()));
}
bool SharedBuffer::maybeAppendDataArray(SharedBuffer* data)
{
if (m_buffer->data.size() || m_cfData || !data->m_dataArray.size())
return false;
#if !ASSERT_DISABLED
unsigned originalSize = size();
#endif
for (auto& cfData : data->m_dataArray)
append(cfData.get());
ASSERT(size() == originalSize + data->size());
return true;
}
#endif
}
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