1/*
2 * Copyright (C) 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 * 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "FourCC.h"
29#include <wtf/Forward.h>
30#include <wtf/TypeCasts.h>
31
32namespace JSC {
33class DataView;
34}
35
36namespace WebCore {
37
38class WEBCORE_EXPORT ISOBox {
39public:
40 virtual ~ISOBox() = default;
41
42 using PeekResult = Optional<std::pair<FourCC, uint64_t>>;
43 static PeekResult peekBox(JSC::DataView&, unsigned offset);
44 static size_t minimumBoxSize() { return 2 * sizeof(uint32_t); }
45
46 bool read(JSC::DataView&);
47 bool read(JSC::DataView&, unsigned& offset);
48
49 uint64_t size() const { return m_size; }
50 const FourCC& boxType() const { return m_boxType; }
51 const Vector<uint8_t>& extendedType() const { return m_extendedType; }
52
53protected:
54 virtual bool parse(JSC::DataView&, unsigned& offset);
55
56 enum Endianness {
57 BigEndian,
58 LittleEndian,
59 };
60
61 template <typename T, typename R, typename V>
62 static bool checkedRead(R& returnValue, V& view, unsigned& offset, Endianness endianness)
63 {
64 bool readStatus = false;
65 T value = view.template read<T>(offset, endianness == LittleEndian, &readStatus);
66 if (!readStatus)
67 return false;
68
69 returnValue = value;
70 return true;
71 }
72
73 uint64_t m_size { 0 };
74 FourCC m_boxType { uint32_t { 0 } };
75 Vector<uint8_t> m_extendedType;
76};
77
78class WEBCORE_EXPORT ISOFullBox : public ISOBox {
79public:
80 uint8_t version() const { return m_version; }
81 uint32_t flags() const { return m_flags; }
82
83protected:
84 bool parse(JSC::DataView&, unsigned& offset) override;
85
86 uint8_t m_version { 0 };
87 uint32_t m_flags { 0 };
88};
89
90}
91
92#define SPECIALIZE_TYPE_TRAITS_ISOBOX(ISOBoxType) \
93SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ISOBoxType) \
94static bool isType(const WebCore::ISOBox& box) { return box.boxType() == WebCore::ISOBoxType::boxTypeName(); } \
95SPECIALIZE_TYPE_TRAITS_END()
96