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/*
* Copyright (C) 2009, 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 SerializedScriptValue_h
#define SerializedScriptValue_h
#include "bindings/v8/ScriptValue.h"
#include "wtf/HashMap.h"
#include "wtf/ThreadSafeRefCounted.h"
#include <v8.h>
namespace WTF {
class ArrayBuffer;
class ArrayBufferContents;
}
namespace WebCore {
class BlobDataHandle;
class MessagePort;
typedef Vector<RefPtr<MessagePort>, 1> MessagePortArray;
typedef Vector<RefPtr<WTF::ArrayBuffer>, 1> ArrayBufferArray;
typedef HashMap<String, RefPtr<BlobDataHandle> > BlobDataHandleMap;
class SerializedScriptValue FINAL : public ThreadSafeRefCounted<SerializedScriptValue> {
public:
// Increment this for each incompatible change to the wire format.
// Version 2: Added StringUCharTag for UChar v8 strings.
// Version 3: Switched to using uuids as blob data identifiers.
// Version 4: Extended File serialization to be complete.
static const uint32_t wireFormatVersion = 4;
~SerializedScriptValue();
// If a serialization error occurs (e.g., cyclic input value) this
// function returns an empty representation, schedules a V8 exception to
// be thrown using v8::ThrowException(), and sets |didThrow|. In this case
// the caller must not invoke any V8 operations until control returns to
// V8. When serialization is successful, |didThrow| is false.
static PassRefPtr<SerializedScriptValue> create(v8::Handle<v8::Value>, MessagePortArray*, ArrayBufferArray*, bool& didThrow, v8::Isolate*);
static PassRefPtr<SerializedScriptValue> createFromWire(const String&);
static PassRefPtr<SerializedScriptValue> createFromWireBytes(const Vector<uint8_t>&);
static PassRefPtr<SerializedScriptValue> create(const String&);
static PassRefPtr<SerializedScriptValue> create(const String&, v8::Isolate*);
static PassRefPtr<SerializedScriptValue> create();
static PassRefPtr<SerializedScriptValue> create(const ScriptValue&, bool& didThrow, ScriptState*);
// Never throws exceptions.
static PassRefPtr<SerializedScriptValue> createAndSwallowExceptions(v8::Handle<v8::Value>, v8::Isolate*);
static PassRefPtr<SerializedScriptValue> nullValue();
static PassRefPtr<SerializedScriptValue> nullValue(v8::Isolate*);
String toWireString() const { return m_data; }
void toWireBytes(Vector<char>&) const;
// Deserializes the value (in the current context). Returns a null value in
// case of failure.
v8::Handle<v8::Value> deserialize(MessagePortArray* = 0);
v8::Handle<v8::Value> deserialize(v8::Isolate*, MessagePortArray* = 0);
// Only reflects the truth if the SSV was created by walking a v8 value, not reliable
// if the SSV was created createdFromWire(data).
bool containsBlobs() const { return !m_blobDataHandles.isEmpty(); }
// Informs the V8 about external memory allocated and owned by this object. Large values should contribute
// to GC counters to eventually trigger a GC, otherwise flood of postMessage() can cause OOM.
// Ok to invoke multiple times (only adds memory once).
// The memory registration is revoked automatically in destructor.
void registerMemoryAllocatedWithCurrentScriptContext();
private:
enum StringDataMode {
StringValue,
WireData
};
enum ExceptionPolicy {
ThrowExceptions,
DoNotThrowExceptions
};
typedef Vector<WTF::ArrayBufferContents, 1> ArrayBufferContentsArray;
SerializedScriptValue();
SerializedScriptValue(v8::Handle<v8::Value>, MessagePortArray*, ArrayBufferArray*, bool& didThrow, v8::Isolate*, ExceptionPolicy = ThrowExceptions);
explicit SerializedScriptValue(const String& wireData);
static PassOwnPtr<ArrayBufferContentsArray> transferArrayBuffers(ArrayBufferArray&, bool& didThrow, v8::Isolate*);
String m_data;
OwnPtr<ArrayBufferContentsArray> m_arrayBufferContentsArray;
BlobDataHandleMap m_blobDataHandles;
intptr_t m_externallyAllocatedMemory;
};
} // namespace WebCore
#endif // SerializedScriptValue_h
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