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: |
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 | |