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/*
* Copyright (C) 2010 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef CachedMetadata_h
#define CachedMetadata_h
#include "core/CoreExport.h"
#include "wtf/Assertions.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include <stdint.h>
namespace blink {
// Metadata retrieved from the embedding application's cache.
//
// Serialized data is NOT portable across architectures. However, reading the
// data type ID will reject data generated with a different byte-order.
class CORE_EXPORT CachedMetadata : public RefCounted<CachedMetadata> {
public:
static PassRefPtr<CachedMetadata> create(uint32_t dataTypeID,
const char* data,
size_t size) {
return adoptRef(new CachedMetadata(dataTypeID, data, size));
}
static PassRefPtr<CachedMetadata> createFromSerializedData(const char* data,
size_t size) {
return adoptRef(new CachedMetadata(data, size));
}
~CachedMetadata() {}
const Vector<char>& serializedData() const { return m_serializedData; }
uint32_t dataTypeID() const {
// We need to define a local variable to use the constant in DCHECK.
constexpr auto kDataStart = CachedMetadata::kDataStart;
DCHECK_GE(m_serializedData.size(), kDataStart);
return *reinterpret_cast_ptr<uint32_t*>(
const_cast<char*>(m_serializedData.data()));
}
const char* data() const {
constexpr auto kDataStart = CachedMetadata::kDataStart;
DCHECK_GE(m_serializedData.size(), kDataStart);
return m_serializedData.data() + kDataStart;
}
size_t size() const {
constexpr auto kDataStart = CachedMetadata::kDataStart;
DCHECK_GE(m_serializedData.size(), kDataStart);
return m_serializedData.size() - kDataStart;
}
private:
CachedMetadata(const char* data, size_t);
CachedMetadata(uint32_t dataTypeID, const char* data, size_t);
// Since the serialization format supports random access, storing it in
// serialized form avoids need for a copy during serialization.
Vector<char> m_serializedData;
// |m_serializedData| consists of 32 bits type ID and and actual data.
static constexpr size_t kDataStart = sizeof(uint32_t);
};
} // namespace blink
#endif
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