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 JSObject { 36 friend class JSGlobalData; 37 public: canAccessIndex(unsigned i)38 bool canAccessIndex(unsigned i) { return i < m_storage->length(); } getIndex(ExecState * exec,unsigned i)39 JSValue getIndex(ExecState* exec, unsigned i) 40 { 41 ASSERT(canAccessIndex(i)); 42 return jsNumber(exec, m_storage->data()[i]); 43 } 44 setIndex(unsigned i,int value)45 void setIndex(unsigned i, int value) 46 { 47 ASSERT(canAccessIndex(i)); 48 if (value & ~0xFF) { 49 if (value < 0) 50 value = 0; 51 else 52 value = 255; 53 } 54 m_storage->data()[i] = static_cast<unsigned char>(value); 55 } 56 setIndex(unsigned i,double value)57 void setIndex(unsigned i, double value) 58 { 59 ASSERT(canAccessIndex(i)); 60 if (!(value > 0)) // Clamp NaN to 0 61 value = 0; 62 else if (value > 255) 63 value = 255; 64 m_storage->data()[i] = static_cast<unsigned char>(value + 0.5); 65 } 66 setIndex(ExecState * exec,unsigned i,JSValue value)67 void setIndex(ExecState* exec, unsigned i, JSValue value) 68 { 69 double byteValue = value.toNumber(exec); 70 if (exec->hadException()) 71 return; 72 if (canAccessIndex(i)) 73 setIndex(i, byteValue); 74 } 75 76 JSByteArray(ExecState* exec, NonNullPassRefPtr<Structure>, WTF::ByteArray* storage, const JSC::ClassInfo* = &s_defaultInfo); 77 static PassRefPtr<Structure> createStructure(JSValue prototype); 78 79 virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&); 80 virtual bool getOwnPropertySlot(JSC::ExecState*, unsigned propertyName, JSC::PropertySlot&); 81 virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); 82 virtual void put(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue, JSC::PutPropertySlot&); 83 virtual void put(JSC::ExecState*, unsigned propertyName, JSC::JSValue); 84 85 virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); 86 classInfo()87 virtual const ClassInfo* classInfo() const { return m_classInfo; } 88 static const ClassInfo s_defaultInfo; 89 length()90 size_t length() const { return m_storage->length(); } 91 storage()92 WTF::ByteArray* storage() const { return m_storage.get(); } 93 94 #if !ASSERT_DISABLED 95 virtual ~JSByteArray(); 96 #endif 97 98 protected: 99 static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags; 100 101 private: 102 enum VPtrStealingHackType { VPtrStealingHack }; JSByteArray(VPtrStealingHackType)103 JSByteArray(VPtrStealingHackType) 104 : JSObject(createStructure(jsNull())) 105 , m_classInfo(0) 106 { 107 } 108 109 RefPtr<WTF::ByteArray> m_storage; 110 const ClassInfo* m_classInfo; 111 }; 112 113 JSByteArray* asByteArray(JSValue value); asByteArray(JSValue value)114 inline JSByteArray* asByteArray(JSValue value) 115 { 116 return static_cast<JSByteArray*>(asCell(value)); 117 } 118 isJSByteArray(JSGlobalData * globalData,JSValue v)119 inline bool isJSByteArray(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsByteArrayVPtr; } 120 121 } // namespace JSC 122 123 #endif // JSByteArray_h 124