1/*
2 * Copyright (C) 2013-2016 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#include "config.h"
27#include "JSDataView.h"
28
29#include "ArrayBufferView.h"
30#include "DataView.h"
31#include "Error.h"
32#include "JSCInlines.h"
33#include "TypeError.h"
34
35namespace JSC {
36
37const ClassInfo JSDataView::s_info = {
38 "DataView", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDataView)};
39
40JSDataView::JSDataView(VM& vm, ConstructionContext& context, ArrayBuffer* buffer)
41 : Base(vm, context)
42 , m_buffer(buffer)
43{
44}
45
46JSDataView* JSDataView::create(
47 ExecState* exec, Structure* structure, RefPtr<ArrayBuffer>&& buffer,
48 unsigned byteOffset, unsigned byteLength)
49{
50 VM& vm = exec->vm();
51 auto scope = DECLARE_THROW_SCOPE(vm);
52
53 ASSERT(buffer);
54 if (!ArrayBufferView::verifySubRangeLength(*buffer, byteOffset, byteLength, sizeof(uint8_t))) {
55 throwVMError(exec, scope, createRangeError(exec, "Length out of range of buffer"_s));
56 return nullptr;
57 }
58 if (!ArrayBufferView::verifyByteOffsetAlignment(byteOffset, sizeof(uint8_t))) {
59 throwException(exec, scope, createRangeError(exec, "Byte offset is not aligned"_s));
60 return nullptr;
61 }
62 ConstructionContext context(
63 structure, buffer.copyRef(), byteOffset, byteLength, ConstructionContext::DataView);
64 ASSERT(context);
65 JSDataView* result =
66 new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
67 result->finishCreation(vm);
68 return result;
69}
70
71JSDataView* JSDataView::createUninitialized(ExecState*, Structure*, unsigned)
72{
73 UNREACHABLE_FOR_PLATFORM();
74 return 0;
75}
76
77JSDataView* JSDataView::create(ExecState*, Structure*, unsigned)
78{
79 UNREACHABLE_FOR_PLATFORM();
80 return 0;
81}
82
83bool JSDataView::set(ExecState*, unsigned, JSObject*, unsigned, unsigned)
84{
85 UNREACHABLE_FOR_PLATFORM();
86 return false;
87}
88
89bool JSDataView::setIndex(ExecState*, unsigned, JSValue)
90{
91 UNREACHABLE_FOR_PLATFORM();
92 return false;
93}
94
95RefPtr<DataView> JSDataView::possiblySharedTypedImpl()
96{
97 return DataView::create(possiblySharedBuffer(), byteOffset(), length());
98}
99
100RefPtr<DataView> JSDataView::unsharedTypedImpl()
101{
102 return DataView::create(unsharedBuffer(), byteOffset(), length());
103}
104
105bool JSDataView::getOwnPropertySlot(
106 JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
107{
108 VM& vm = exec->vm();
109 JSDataView* thisObject = jsCast<JSDataView*>(object);
110 if (propertyName == vm.propertyNames->byteLength) {
111 slot.setValue(thisObject, PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly, jsNumber(thisObject->m_length));
112 return true;
113 }
114 if (propertyName == vm.propertyNames->byteOffset) {
115 slot.setValue(thisObject, PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly, jsNumber(thisObject->byteOffset()));
116 return true;
117 }
118
119 return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
120}
121
122bool JSDataView::put(
123 JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value,
124 PutPropertySlot& slot)
125{
126 VM& vm = exec->vm();
127 auto scope = DECLARE_THROW_SCOPE(vm);
128 JSDataView* thisObject = jsCast<JSDataView*>(cell);
129
130 if (UNLIKELY(isThisValueAltered(slot, thisObject)))
131 RELEASE_AND_RETURN(scope, ordinarySetSlow(exec, thisObject, propertyName, value, slot.thisValue(), slot.isStrictMode()));
132
133 if (propertyName == vm.propertyNames->byteLength
134 || propertyName == vm.propertyNames->byteOffset)
135 return typeError(exec, scope, slot.isStrictMode(), "Attempting to write to read-only typed array property."_s);
136
137 RELEASE_AND_RETURN(scope, Base::put(thisObject, exec, propertyName, value, slot));
138}
139
140bool JSDataView::defineOwnProperty(
141 JSObject* object, ExecState* exec, PropertyName propertyName,
142 const PropertyDescriptor& descriptor, bool shouldThrow)
143{
144 VM& vm = exec->vm();
145 auto scope = DECLARE_THROW_SCOPE(vm);
146 JSDataView* thisObject = jsCast<JSDataView*>(object);
147 if (propertyName == vm.propertyNames->byteLength
148 || propertyName == vm.propertyNames->byteOffset)
149 return typeError(exec, scope, shouldThrow, "Attempting to define read-only typed array property."_s);
150
151 RELEASE_AND_RETURN(scope, Base::defineOwnProperty(thisObject, exec, propertyName, descriptor, shouldThrow));
152}
153
154bool JSDataView::deleteProperty(
155 JSCell* cell, ExecState* exec, PropertyName propertyName)
156{
157 VM& vm = exec->vm();
158 JSDataView* thisObject = jsCast<JSDataView*>(cell);
159 if (propertyName == vm.propertyNames->byteLength
160 || propertyName == vm.propertyNames->byteOffset)
161 return false;
162
163 return Base::deleteProperty(thisObject, exec, propertyName);
164}
165
166void JSDataView::getOwnNonIndexPropertyNames(
167 JSObject* object, ExecState* exec, PropertyNameArray& array, EnumerationMode mode)
168{
169 VM& vm = exec->vm();
170 JSDataView* thisObject = jsCast<JSDataView*>(object);
171
172 if (mode.includeDontEnumProperties()) {
173 array.add(vm.propertyNames->byteOffset);
174 array.add(vm.propertyNames->byteLength);
175 }
176
177 Base::getOwnNonIndexPropertyNames(thisObject, exec, array, mode);
178}
179
180Structure* JSDataView::createStructure(
181 VM& vm, JSGlobalObject* globalObject, JSValue prototype)
182{
183 return Structure::create(
184 vm, globalObject, prototype, TypeInfo(DataViewType, StructureFlags), info(),
185 NonArray);
186}
187
188} // namespace JSC
189
190