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/*
* Copyright (C) 2009 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. ``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
* 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 JSByteArray_h
#define JSByteArray_h
#include "JSObject.h"
#include <wtf/ByteArray.h>
namespace JSC {
class JSByteArray : public JSNonFinalObject {
friend class JSGlobalData;
public:
typedef JSNonFinalObject Base;
bool canAccessIndex(unsigned i) { return i < m_storage->length(); }
JSValue getIndex(ExecState*, unsigned i)
{
ASSERT(canAccessIndex(i));
return jsNumber(m_storage->data()[i]);
}
void setIndex(unsigned i, int value)
{
ASSERT(canAccessIndex(i));
if (value & ~0xFF) {
if (value < 0)
value = 0;
else
value = 255;
}
m_storage->data()[i] = static_cast<unsigned char>(value);
}
void setIndex(unsigned i, double value)
{
ASSERT(canAccessIndex(i));
if (!(value > 0)) // Clamp NaN to 0
value = 0;
else if (value > 255)
value = 255;
m_storage->data()[i] = static_cast<unsigned char>(value + 0.5);
}
void setIndex(ExecState* exec, unsigned i, JSValue value)
{
double byteValue = value.toNumber(exec);
if (exec->hadException())
return;
if (canAccessIndex(i))
setIndex(i, byteValue);
}
private:
JSByteArray(ExecState*, Structure*, ByteArray* storage);
public:
static JSByteArray* create(ExecState* exec, Structure* structure, ByteArray* storage)
{
JSByteArray* array = new (NotNull, allocateCell<JSByteArray>(*exec->heap())) JSByteArray(exec, structure, storage);
array->finishCreation(exec);
return array;
}
static Structure* createStructure(JSGlobalData&, JSGlobalObject*, JSValue prototype, const JSC::ClassInfo* = &s_info);
static bool getOwnPropertySlot(JSC::JSCell*, JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&);
static bool getOwnPropertySlotByIndex(JSC::JSCell*, JSC::ExecState*, unsigned propertyName, JSC::PropertySlot&);
static bool getOwnPropertyDescriptor(JSObject*, ExecState*, const Identifier&, PropertyDescriptor&);
static void put(JSC::JSCell*, JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue, JSC::PutPropertySlot&);
static void putByIndex(JSC::JSCell*, JSC::ExecState*, unsigned propertyName, JSC::JSValue);
static void getOwnPropertyNames(JSC::JSObject*, JSC::ExecState*, JSC::PropertyNameArray&, EnumerationMode);
static JS_EXPORTDATA const ClassInfo s_info;
size_t length() const { return m_storage->length(); }
WTF::ByteArray* storage() const { return m_storage.get(); }
~JSByteArray();
static void destroy(JSCell*);
static size_t offsetOfStorage() { return OBJECT_OFFSETOF(JSByteArray, m_storage); }
protected:
static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags;
void finishCreation(ExecState* exec)
{
Base::finishCreation(exec->globalData());
putDirect(exec->globalData(), exec->globalData().propertyNames->length, jsNumber(m_storage->length()), ReadOnly | DontDelete);
}
private:
RefPtr<WTF::ByteArray> m_storage;
};
JSByteArray* asByteArray(JSValue value);
inline JSByteArray* asByteArray(JSValue value)
{
return static_cast<JSByteArray*>(value.asCell());
}
inline bool isJSByteArray(JSValue v) { return v.isCell() && v.asCell()->classInfo() == &JSByteArray::s_info; }
} // namespace JSC
#endif // JSByteArray_h
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