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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FourCC.h"
#include <wtf/Forward.h>
#include <wtf/StdIntExtras.h>
#include <wtf/TypeCasts.h>
namespace JSC {
class DataView;
}
namespace WebCore {
class ISOBox {
WTF_MAKE_FAST_ALLOCATED;
public:
WEBCORE_EXPORT ISOBox();
WEBCORE_EXPORT ISOBox(const ISOBox&);
ISOBox(ISOBox&&) = default;
WEBCORE_EXPORT virtual ~ISOBox();
ISOBox& operator=(const ISOBox&) = default;
ISOBox& operator=(ISOBox&&) = default;
using PeekResult = std::optional<std::pair<FourCC, uint64_t>>;
static PeekResult peekBox(JSC::DataView&, unsigned offset);
static constexpr size_t minimumBoxSize() { return 2 * sizeof(uint32_t); }
WEBCORE_EXPORT bool read(JSC::DataView&);
bool read(JSC::DataView&, unsigned& offset);
uint64_t size() const { return m_size; }
FourCC boxType() const { return m_boxType; }
const Vector<uint8_t>& extendedType() const { return m_extendedType; }
protected:
virtual bool parse(JSC::DataView&, unsigned& offset);
enum Endianness { BigEndian, LittleEndian };
template<typename T, typename R, typename V>
static bool checkedRead(R& returnValue, V& view, unsigned& offset, Endianness endianness)
{
bool readStatus = false;
size_t actualOffset = offset;
T value = view.template read<T>(actualOffset, endianness == LittleEndian, &readStatus);
RELEASE_ASSERT(isInBounds<uint32_t>(actualOffset));
offset = actualOffset;
if (!readStatus)
return false;
returnValue = value;
return true;
}
uint64_t m_size { 0 };
FourCC m_boxType;
Vector<uint8_t> m_extendedType;
};
class ISOFullBox : public ISOBox {
public:
WEBCORE_EXPORT ISOFullBox();
WEBCORE_EXPORT ISOFullBox(const ISOFullBox&);
ISOFullBox(ISOFullBox&&) = default;
uint8_t version() const { return m_version; }
uint32_t flags() const { return m_flags; }
protected:
bool parse(JSC::DataView&, unsigned& offset) override;
bool parseVersionAndFlags(JSC::DataView&, unsigned& offset);
uint8_t m_version { 0 };
uint32_t m_flags { 0 };
};
}
#define SPECIALIZE_TYPE_TRAITS_ISOBOX(ISOBoxType) \
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ISOBoxType) \
static bool isType(const WebCore::ISOBox& box) { return box.boxType() == WebCore::ISOBoxType::boxTypeName(); } \
SPECIALIZE_TYPE_TRAITS_END()
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