1/*
2 * Copyright (C) 2013-2017 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "ArrayBufferView.h"
29#include <wtf/FlipBytes.h>
30
31namespace JSC {
32
33class DataView : public ArrayBufferView {
34protected:
35 DataView(RefPtr<ArrayBuffer>&&, unsigned byteOffset, unsigned byteLength);
36
37public:
38 JS_EXPORT_PRIVATE static Ref<DataView> create(RefPtr<ArrayBuffer>&&, unsigned byteOffset, unsigned length);
39 static Ref<DataView> create(RefPtr<ArrayBuffer>&&);
40
41 TypedArrayType getType() const override
42 {
43 return TypeDataView;
44 }
45
46 JSArrayBufferView* wrap(JSGlobalObject*, JSGlobalObject*) override;
47
48 template<typename T>
49 T get(unsigned offset, bool littleEndian, bool* status = 0)
50 {
51 if (status) {
52 if (offset + sizeof(T) > byteLength()) {
53 *status = false;
54 return T();
55 }
56 *status = true;
57 } else
58 RELEASE_ASSERT(offset + sizeof(T) <= byteLength());
59 return flipBytesIfLittleEndian(
60 *reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress.get(byteLength())) + offset),
61 littleEndian);
62 }
63
64 template<typename T>
65 T read(unsigned& offset, bool littleEndian, bool* status = 0)
66 {
67 T result = this->template get<T>(offset, littleEndian, status);
68 if (!status || *status)
69 offset += sizeof(T);
70 return result;
71 }
72
73 template<typename T>
74 void set(unsigned offset, T value, bool littleEndian, bool* status = 0)
75 {
76 if (status) {
77 if (offset + sizeof(T) > byteLength()) {
78 *status = false;
79 return;
80 }
81 *status = true;
82 } else
83 RELEASE_ASSERT(offset + sizeof(T) <= byteLength());
84 *reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress.get(byteLength())) + offset) =
85 flipBytesIfLittleEndian(value, littleEndian);
86 }
87};
88
89} // namespace JSC
90