sharedbuffer.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006, 2008 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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 "PurgeableBuffer.h"

namespace WebCore {

SharedBuffer::SharedBuffer()
{
}

SharedBuffer::SharedBuffer(const char* data, int size)
{
    m_buffer.append(data, size);
}

SharedBuffer::SharedBuffer(const unsigned char* data, int size)
{
    m_buffer.append(data, size);
}
    
SharedBuffer::~SharedBuffer()
{
}

PassRefPtr<SharedBuffer> SharedBuffer::adoptVector(Vector<char>& vector)
{
    RefPtr<SharedBuffer> buffer = create();
    buffer->m_buffer.swap(vector);
    return buffer.release();
}

PassRefPtr<SharedBuffer> SharedBuffer::adoptPurgeableBuffer(PurgeableBuffer* purgeableBuffer) 
{ 
    ASSERT(!purgeableBuffer->isPurgeable());
    RefPtr<SharedBuffer> buffer = create();
    buffer->m_purgeableBuffer.set(purgeableBuffer);
    return buffer.release();
}

unsigned SharedBuffer::size() const
{
    if (hasPlatformData())
        return platformDataSize();
    
    if (m_purgeableBuffer)
        return m_purgeableBuffer->size();
    
    return m_buffer.size();
}

const char* SharedBuffer::data() const
{
    if (hasPlatformData())
        return platformData();
    
    if (m_purgeableBuffer)
        return m_purgeableBuffer->data();
    
    return m_buffer.data();
}

void SharedBuffer::append(const char* data, int len)
{
    ASSERT(!m_purgeableBuffer);

    maybeTransferPlatformData();
    
    m_buffer.append(data, len);
}

void SharedBuffer::clear()
{
    clearPlatformData();
    
    m_buffer.clear();
    m_purgeableBuffer.clear();
}

PassRefPtr<SharedBuffer> SharedBuffer::copy() const
{
    return SharedBuffer::create(data(), size());
}

PurgeableBuffer* SharedBuffer::releasePurgeableBuffer()
{ 
    ASSERT(hasOneRef()); 
    return m_purgeableBuffer.release(); 
}

#if !PLATFORM(CF)

inline void SharedBuffer::clearPlatformData()
{
}

inline void SharedBuffer::maybeTransferPlatformData()
{
}

inline bool SharedBuffer::hasPlatformData() const
{
    return false;
}

inline const char* SharedBuffer::platformData() const
{
    ASSERT_NOT_REACHED();

    return 0;
}

inline unsigned SharedBuffer::platformDataSize() const
{
    ASSERT_NOT_REACHED();
    
    return 0;
}

#endif

}