1 /* 2 * Copyright (C) 2009 Apple Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef JSByteArray_h 27 #define JSByteArray_h 28 29 #include "JSObject.h" 30 31 #include <wtf/ByteArray.h> 32 33 namespace JSC { 34 35 class JSByteArray : public JSNonFinalObject { 36 friend class JSGlobalData; 37 public: 38 typedef JSNonFinalObject Base; 39 canAccessIndex(unsigned i)40 bool canAccessIndex(unsigned i) { return i < m_storage->length(); } getIndex(ExecState *,unsigned i)41 JSValue getIndex(ExecState*, unsigned i) 42 { 43 ASSERT(canAccessIndex(i)); 44 return jsNumber(m_storage->data()[i]); 45 } 46 setIndex(unsigned i,int value)47 void setIndex(unsigned i, int value) 48 { 49 ASSERT(canAccessIndex(i)); 50 if (value & ~0xFF) { 51 if (value < 0) 52 value = 0; 53 else 54 value = 255; 55 } 56 m_storage->data()[i] = static_cast<unsigned char>(value); 57 } 58 setIndex(unsigned i,double value)59 void setIndex(unsigned i, double value) 60 { 61 ASSERT(canAccessIndex(i)); 62 if (!(value > 0)) // Clamp NaN to 0 63 value = 0; 64 else if (value > 255) 65 value = 255; 66 m_storage->data()[i] = static_cast<unsigned char>(value + 0.5); 67 } 68 setIndex(ExecState * exec,unsigned i,JSValue value)69 void setIndex(ExecState* exec, unsigned i, JSValue value) 70 { 71 double byteValue = value.toNumber(exec); 72 if (exec->hadException()) 73 return; 74 if (canAccessIndex(i)) 75 setIndex(i, byteValue); 76 } 77 78 JSByteArray(ExecState*, Structure*, WTF::ByteArray* storage); 79 static Structure* createStructure(JSGlobalData&, JSValue prototype, const JSC::ClassInfo* = &s_defaultInfo); 80 81 virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&); 82 virtual bool getOwnPropertySlot(JSC::ExecState*, unsigned propertyName, JSC::PropertySlot&); 83 virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); 84 virtual void put(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue, JSC::PutPropertySlot&); 85 virtual void put(JSC::ExecState*, unsigned propertyName, JSC::JSValue); 86 87 virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); 88 89 static const ClassInfo s_defaultInfo; 90 length()91 size_t length() const { return m_storage->length(); } 92 storage()93 WTF::ByteArray* storage() const { return m_storage.get(); } 94 95 #if !ASSERT_DISABLED 96 virtual ~JSByteArray(); 97 #endif 98 99 protected: 100 static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags; 101 102 private: JSByteArray(VPtrStealingHackType)103 JSByteArray(VPtrStealingHackType) 104 : JSNonFinalObject(VPtrStealingHack) 105 { 106 } 107 108 RefPtr<WTF::ByteArray> m_storage; 109 }; 110 111 JSByteArray* asByteArray(JSValue value); asByteArray(JSValue value)112 inline JSByteArray* asByteArray(JSValue value) 113 { 114 return static_cast<JSByteArray*>(value.asCell()); 115 } 116 isJSByteArray(JSGlobalData * globalData,JSValue v)117 inline bool isJSByteArray(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsByteArrayVPtr; } 118 119 } // namespace JSC 120 121 #endif // JSByteArray_h 122