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/*
* Copyright (C) 2017-2023 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 "ISOTrackEncryptionBox.h"
#include <JavaScriptCore/DataView.h>
using JSC::DataView;
namespace WebCore {
ISOTrackEncryptionBox::ISOTrackEncryptionBox() = default;
ISOTrackEncryptionBox::~ISOTrackEncryptionBox() = default;
bool ISOTrackEncryptionBox::parseWithoutTypeAndSize(DataView& view)
{
// Clients may want to parse the contents of a `tenc` box without the
// leading size and name fields.
unsigned offset = 0;
return parseVersionAndFlags(view, offset) && parsePayload(view, offset);
}
bool ISOTrackEncryptionBox::parse(DataView& view, unsigned& offset)
{
// ISO/IEC 23001-7-2015 Section 8.2.2
if (!ISOFullBox::parse(view, offset))
return false;
return parsePayload(view, offset);
}
bool ISOTrackEncryptionBox::parsePayload(DataView& view, unsigned& offset)
{
// unsigned int(8) reserved = 0;
offset += 1;
if (!m_version) {
// unsigned int(8) reserved = 0;
offset += 1;
} else {
int8_t cryptAndSkip = 0;
if (!checkedRead<int8_t>(cryptAndSkip, view, offset, BigEndian))
return false;
m_defaultCryptByteBlock = cryptAndSkip >> 4;
m_defaultSkipByteBlock = cryptAndSkip & 0xF;
}
if (!checkedRead<int8_t>(m_defaultIsProtected, view, offset, BigEndian))
return false;
if (!checkedRead<int8_t>(m_defaultPerSampleIVSize, view, offset, BigEndian))
return false;
auto buffer = view.possiblySharedBuffer();
if (!buffer)
return false;
auto keyIDBuffer = buffer->slice(offset, offset + 16);
offset += 16;
m_defaultKID.resize(16);
if (keyIDBuffer->byteLength() < 16)
return false;
memcpy(m_defaultKID.data(), keyIDBuffer->data(), 16);
if (m_defaultIsProtected == 1 && !m_defaultPerSampleIVSize) {
int8_t defaultConstantIVSize = 0;
if (!checkedRead<int8_t>(defaultConstantIVSize, view, offset, BigEndian) || defaultConstantIVSize < 0)
return false;
Vector<uint8_t> defaultConstantIV;
defaultConstantIV.reserveInitialCapacity(defaultConstantIVSize);
while (defaultConstantIVSize--) {
int8_t character = 0;
if (!checkedRead<int8_t>(character, view, offset, BigEndian))
return false;
defaultConstantIV.uncheckedAppend(character);
}
m_defaultConstantIV = WTFMove(defaultConstantIV);
}
return true;
}
}
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