]> git.saurik.com Git - apple/javascriptcore.git/blob - runtime/JSDataView.cpp
JavaScriptCore-7601.1.46.3.tar.gz
[apple/javascriptcore.git] / runtime / JSDataView.cpp
1 /*
2 * Copyright (C) 2013 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
34 namespace JSC {
35
36 const ClassInfo JSDataView::s_info = {
37 "DataView", &Base::s_info, 0, CREATE_METHOD_TABLE(JSDataView)};
38
39 JSDataView::JSDataView(VM& vm, ConstructionContext& context, ArrayBuffer* buffer)
40 : Base(vm, context)
41 , m_buffer(buffer)
42 {
43 }
44
45 JSDataView* JSDataView::create(
46 ExecState* exec, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer,
47 unsigned byteOffset, unsigned byteLength)
48 {
49 RefPtr<ArrayBuffer> buffer = passedBuffer;
50 if (!ArrayBufferView::verifySubRangeLength(buffer, byteOffset, byteLength, sizeof(uint8_t))) {
51 throwVMError(exec, createRangeError(exec, ASCIILiteral("Length out of range of buffer")));
52 return nullptr;
53 }
54 if (!ArrayBufferView::verifyByteOffsetAlignment(byteOffset, sizeof(uint8_t))) {
55 exec->vm().throwException(exec, createRangeError(exec, ASCIILiteral("Byte offset is not aligned")));
56 return nullptr;
57 }
58 VM& vm = exec->vm();
59 ConstructionContext context(
60 structure, buffer, byteOffset, byteLength, ConstructionContext::DataView);
61 ASSERT(context);
62 JSDataView* result =
63 new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
64 result->finishCreation(vm);
65 return result;
66 }
67
68 JSDataView* JSDataView::createUninitialized(ExecState*, Structure*, unsigned)
69 {
70 UNREACHABLE_FOR_PLATFORM();
71 return 0;
72 }
73
74 JSDataView* JSDataView::create(ExecState*, Structure*, unsigned)
75 {
76 UNREACHABLE_FOR_PLATFORM();
77 return 0;
78 }
79
80 bool JSDataView::set(ExecState*, JSObject*, unsigned, unsigned)
81 {
82 UNREACHABLE_FOR_PLATFORM();
83 return false;
84 }
85
86 PassRefPtr<DataView> JSDataView::typedImpl()
87 {
88 return DataView::create(buffer(), byteOffset(), length());
89 }
90
91 bool JSDataView::getOwnPropertySlot(
92 JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
93 {
94 JSDataView* thisObject = jsCast<JSDataView*>(object);
95 if (propertyName == exec->propertyNames().byteLength) {
96 slot.setValue(thisObject, DontEnum | ReadOnly, jsNumber(thisObject->m_length));
97 return true;
98 }
99
100 return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
101 }
102
103 ArrayBuffer* JSDataView::slowDownAndWasteMemory(JSArrayBufferView*)
104 {
105 UNREACHABLE_FOR_PLATFORM();
106 return 0;
107 }
108
109 PassRefPtr<ArrayBufferView> JSDataView::getTypedArrayImpl(JSArrayBufferView* object)
110 {
111 JSDataView* thisObject = jsCast<JSDataView*>(object);
112 return thisObject->typedImpl();
113 }
114
115 Structure* JSDataView::createStructure(
116 VM& vm, JSGlobalObject* globalObject, JSValue prototype)
117 {
118 return Structure::create(
119 vm, globalObject, prototype, TypeInfo(DataViewType, StructureFlags), info(),
120 NonArray);
121 }
122
123 } // namespace JSC
124