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/*
* Copyright (C) 2012 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 INC. 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 INC. 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 "ShareableResource.h"
#include "ArgumentCoders.h"
#include <WebCore/SharedBuffer.h>
using namespace WebCore;
namespace WebKit {
ShareableResource::Handle::Handle()
{
}
void ShareableResource::Handle::encode(CoreIPC::ArgumentEncoder& encoder) const
{
encoder << m_handle;
encoder << m_offset;
encoder << m_size;
}
bool ShareableResource::Handle::decode(CoreIPC::ArgumentDecoder& decoder, Handle& handle)
{
if (!decoder.decode(handle.m_handle))
return false;
if (!decoder.decode(handle.m_offset))
return false;
if (!decoder.decode(handle.m_size))
return false;
return true;
}
static void shareableResourceDeallocate(void *ptr, void *info)
{
(static_cast<ShareableResource*>(info))->deref(); // Balanced by ref() in createShareableResourceDeallocator()
}
static CFAllocatorRef createShareableResourceDeallocator(ShareableResource* resource)
{
resource->ref(); // Balanced by deref in shareableResourceDeallocate()
CFAllocatorContext context = { 0,
resource,
NULL, // retain
NULL, // release
NULL, // copyDescription
NULL, // allocate
NULL, // reallocate
shareableResourceDeallocate,
NULL, // preferredSize
};
return CFAllocatorCreate(kCFAllocatorDefault, &context);
}
PassRefPtr<SharedBuffer> ShareableResource::Handle::tryWrapInSharedBuffer() const
{
RefPtr<ShareableResource> resource = ShareableResource::create(*this);
if (!resource) {
LOG_ERROR("Failed to recreate ShareableResource from handle.");
return 0;
}
RetainPtr<CFAllocatorRef> deallocator = adoptCF(createShareableResourceDeallocator(resource.get()));
RetainPtr<CFDataRef> data = adoptCF(CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, reinterpret_cast<const UInt8*>(resource->data()), static_cast<CFIndex>(resource->size()), deallocator.get()));
return SharedBuffer::wrapCFData(data.get());
}
PassRefPtr<ShareableResource> ShareableResource::create(PassRefPtr<SharedMemory> sharedMemory, unsigned offset, unsigned size)
{
return adoptRef(new ShareableResource(sharedMemory, offset, size));
}
PassRefPtr<ShareableResource> ShareableResource::create(const Handle& handle)
{
RefPtr<SharedMemory> sharedMemory = SharedMemory::create(handle.m_handle, SharedMemory::ReadOnly);
if (!sharedMemory)
return 0;
return create(sharedMemory.release(), handle.m_offset, handle.m_size);
}
ShareableResource::ShareableResource(PassRefPtr<SharedMemory> sharedMemory, unsigned offset, unsigned size)
: m_sharedMemory(sharedMemory)
, m_offset(offset)
, m_size(size)
{
ASSERT(m_sharedMemory);
ASSERT(m_offset + m_size <= m_sharedMemory->size());
// FIXME (NetworkProcess): This data was received from another process. If it is bogus, should we assume that process is compromised and we should kill it?
}
ShareableResource::~ShareableResource()
{
}
bool ShareableResource::createHandle(Handle& handle)
{
if (!m_sharedMemory->createHandle(handle.m_handle, SharedMemory::ReadOnly))
return false;
handle.m_offset = m_offset;
handle.m_size = m_size;
return true;
}
const char* ShareableResource::data() const
{
return static_cast<const char*>(m_sharedMemory->data()) + m_offset;
}
unsigned ShareableResource::size() const
{
return m_size;
}
} // namespace WebKit
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