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
34namespace JSC {
35
36const ClassInfo JSDataView::s_info = {
37    "DataView", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSDataView)};
38
39JSDataView::JSDataView(VM& vm, ConstructionContext& context, ArrayBuffer* buffer)
40    : Base(vm, context)
41    , m_buffer(buffer)
42{
43}
44
45JSDataView* JSDataView::create(
46    ExecState* exec, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer,
47    unsigned byteOffset, unsigned byteLength)
48{
49    RefPtr<ArrayBuffer> buffer = passedBuffer;
50    if (!ArrayBufferView::verifySubRange<uint8_t>(buffer, byteOffset, byteLength)) {
51        throwVMError(
52            exec, createRangeError(exec, "Byte offset and length out of range of buffer"));
53        return 0;
54    }
55    VM& vm = exec->vm();
56    ConstructionContext context(
57        structure, buffer, byteOffset, byteLength, ConstructionContext::DataView);
58    ASSERT(context);
59    JSDataView* result =
60        new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
61    result->finishCreation(vm);
62    return result;
63}
64
65JSDataView* JSDataView::createUninitialized(ExecState*, Structure*, unsigned)
66{
67    UNREACHABLE_FOR_PLATFORM();
68    return 0;
69}
70
71JSDataView* JSDataView::create(ExecState*, Structure*, unsigned)
72{
73    UNREACHABLE_FOR_PLATFORM();
74    return 0;
75}
76
77bool JSDataView::set(ExecState*, JSObject*, unsigned, unsigned)
78{
79    UNREACHABLE_FOR_PLATFORM();
80    return false;
81}
82
83PassRefPtr<DataView> JSDataView::typedImpl()
84{
85    return DataView::create(buffer(), byteOffset(), length());
86}
87
88bool JSDataView::getOwnPropertySlot(
89    JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
90{
91    JSDataView* thisObject = jsCast<JSDataView*>(object);
92    if (propertyName == exec->propertyNames().byteLength) {
93        slot.setValue(thisObject, DontEnum | ReadOnly, jsNumber(thisObject->m_length));
94        return true;
95    }
96
97    return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
98}
99
100ArrayBuffer* JSDataView::slowDownAndWasteMemory(JSArrayBufferView*)
101{
102    UNREACHABLE_FOR_PLATFORM();
103    return 0;
104}
105
106PassRefPtr<ArrayBufferView> JSDataView::getTypedArrayImpl(JSArrayBufferView* object)
107{
108    JSDataView* thisObject = jsCast<JSDataView*>(object);
109    return thisObject->typedImpl();
110}
111
112Structure* JSDataView::createStructure(
113    VM& vm, JSGlobalObject* globalObject, JSValue prototype)
114{
115    return Structure::create(
116        vm, globalObject, prototype, TypeInfo(DataViewType, StructureFlags), info(),
117        NonArray);
118}
119
120} // namespace JSC
121
122