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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.
*/
#include "config.h"
#include "ISOBox.h"
#include <JavaScriptCore/DataView.h>
#include <wtf/TZoneMallocInlines.h>
using JSC::DataView;
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(ISOBox);
ISOBox::ISOBox() = default;
ISOBox::~ISOBox() = default;
ISOBox::ISOBox(const ISOBox&) = default;
ISOBox::PeekResult ISOBox::peekBox(DataView& view, unsigned offset)
{
unsigned maximumPossibleSize = view.byteLength() - offset;
uint64_t size = 0;
if (!checkedRead<uint32_t>(size, view, offset, BigEndian))
return std::nullopt;
FourCC type;
if (!checkedRead<uint32_t>(type, view, offset, BigEndian))
return std::nullopt;
if (size == 1 && !checkedRead<uint64_t>(size, view, offset, BigEndian))
return std::nullopt;
if (size > maximumPossibleSize)
size = maximumPossibleSize;
else if (!size)
size = maximumPossibleSize;
return std::make_pair(type, size);
}
bool ISOBox::read(DataView& view)
{
unsigned localOffset { 0 };
return parse(view, localOffset);
}
bool ISOBox::read(DataView& view, unsigned& offset)
{
unsigned localOffset = offset;
if (!parse(view, localOffset))
return false;
offset += m_size;
return true;
}
bool ISOBox::parse(DataView& view, unsigned& offset)
{
unsigned maximumPossibleSize = view.byteLength() - offset;
if (!checkedRead<uint32_t>(m_size, view, offset, BigEndian))
return false;
if (!checkedRead<uint32_t>(m_boxType, view, offset, BigEndian))
return false;
if (m_size == 1 && !checkedRead<uint64_t>(m_size, view, offset, BigEndian))
return false;
if (m_size > maximumPossibleSize)
m_size = maximumPossibleSize;
else if (!m_size)
m_size = maximumPossibleSize;
if (m_boxType == std::span { "uuid" }) {
struct ExtendedType {
uint8_t value[16];
} extendedTypeStruct;
if (!checkedRead<ExtendedType>(extendedTypeStruct, view, offset, BigEndian))
return false;
m_extendedType = Vector<uint8_t>(std::span { extendedTypeStruct.value });
}
return true;
}
ISOFullBox::ISOFullBox() = default;
ISOFullBox::ISOFullBox(const ISOFullBox&) = default;
bool ISOFullBox::parse(DataView& view, unsigned& offset)
{
if (!ISOBox::parse(view, offset))
return false;
return parseVersionAndFlags(view, offset);
}
bool ISOFullBox::parseVersionAndFlags(DataView& view, unsigned& offset)
{
uint32_t versionAndFlags = 0;
if (!checkedRead<uint32_t>(versionAndFlags, view, offset, BigEndian))
return false;
m_version = versionAndFlags >> 24;
m_flags = versionAndFlags & 0xFFFFFF;
return true;
}
}
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