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
33namespace JSC {
34
35 class JSByteArray : public JSObject {
36 friend class JSGlobalData;
37 public:
38 bool canAccessIndex(unsigned i) { return i < m_storage->length(); }
39 JSValue getIndex(ExecState* exec, unsigned i)
40 {
41 ASSERT(canAccessIndex(i));
42 return jsNumber(exec, i: m_storage->data()[i]);
43 }
44
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
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
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, value: 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
87 virtual const ClassInfo* classInfo() const { return m_classInfo; }
88 static const ClassInfo s_defaultInfo;
89
90 size_t length() const { return m_storage->length(); }
91
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 };
103 JSByteArray(VPtrStealingHackType)
104 : JSObject(createStructure(prototype: 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);
114 inline JSByteArray* asByteArray(JSValue value)
115 {
116 return static_cast<JSByteArray*>(asCell(value));
117 }
118
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

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSByteArray.h