/* | |
* 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 JSObject { | |
friend class JSGlobalData; | |
public: | |
bool canAccessIndex(unsigned i) { return i < m_storage->length(); } | |
JSValue getIndex(ExecState* exec, unsigned i) | |
{ | |
ASSERT(canAccessIndex(i)); | |
return jsNumber(exec, 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); | |
} | |
JSByteArray(ExecState* exec, NonNullPassRefPtr<Structure>, WTF::ByteArray* storage, const JSC::ClassInfo* = &s_defaultInfo); | |
static PassRefPtr<Structure> createStructure(JSValue prototype); | |
virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&); | |
virtual bool getOwnPropertySlot(JSC::ExecState*, unsigned propertyName, JSC::PropertySlot&); | |
virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); | |
virtual void put(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue, JSC::PutPropertySlot&); | |
virtual void put(JSC::ExecState*, unsigned propertyName, JSC::JSValue); | |
virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); | |
virtual const ClassInfo* classInfo() const { return m_classInfo; } | |
static const ClassInfo s_defaultInfo; | |
size_t length() const { return m_storage->length(); } | |
WTF::ByteArray* storage() const { return m_storage.get(); } | |
#if !ASSERT_DISABLED | |
virtual ~JSByteArray(); | |
#endif | |
protected: | |
static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags; | |
private: | |
enum VPtrStealingHackType { VPtrStealingHack }; | |
JSByteArray(VPtrStealingHackType) | |
: JSObject(createStructure(jsNull())) | |
, m_classInfo(0) | |
{ | |
} | |
RefPtr<WTF::ByteArray> m_storage; | |
const ClassInfo* m_classInfo; | |
}; | |
JSByteArray* asByteArray(JSValue value); | |
inline JSByteArray* asByteArray(JSValue value) | |
{ | |
return static_cast<JSByteArray*>(asCell(value)); | |
} | |
inline bool isJSByteArray(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsByteArrayVPtr; } | |
} // namespace JSC | |
#endif // JSByteArray_h |