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/*
* Copyright (C) 2017-2023 Apple Inc. All rights reserved.
* Copyright (C) 2018 Metrological Group B.V.
* Copyright (C) 2018 Igalia S.L
*
* 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 "ISOProtectionSystemSpecificHeaderBox.h"
#include <JavaScriptCore/DataView.h>
#include <wtf/StdLibExtras.h>
using JSC::DataView;
namespace WebCore {
ISOProtectionSystemSpecificHeaderBox::ISOProtectionSystemSpecificHeaderBox() = default;
ISOProtectionSystemSpecificHeaderBox::~ISOProtectionSystemSpecificHeaderBox() = default;
std::optional<Vector<uint8_t>> ISOProtectionSystemSpecificHeaderBox::peekSystemID(JSC::DataView& view, unsigned offset)
{
auto peekResult = ISOBox::peekBox(view, offset);
if (!peekResult || peekResult.value().first != boxTypeName())
return std::nullopt;
ISOProtectionSystemSpecificHeaderBox psshBox;
psshBox.parse(view, offset);
return psshBox.systemID();
}
bool ISOProtectionSystemSpecificHeaderBox::parse(DataView& view, unsigned& offset)
{
if (!ISOFullBox::parse(view, offset))
return false;
// ISO/IEC 23001-7-2016 Section 8.1.1
auto buffer = view.possiblySharedBuffer();
if (!buffer)
return false;
auto systemID = buffer->slice(offset, offset + 16);
offset += 16;
m_systemID.resize(16);
if (systemID->byteLength() < 16)
return false;
memcpySpan(m_systemID.mutableSpan(), systemID->span().first(16));
if (m_version) {
uint32_t keyIDCount = 0;
if (!checkedRead<uint32_t>(keyIDCount, view, offset, BigEndian))
return false;
if (buffer->byteLength() - offset < keyIDCount * 16)
return false;
if (!m_keyIDs.tryReserveCapacity(keyIDCount))
return false;
m_keyIDs.resize(keyIDCount);
for (unsigned keyID = 0; keyID < keyIDCount; keyID++) {
auto& currentKeyID = m_keyIDs[keyID];
currentKeyID.resize(16);
auto parsedKeyID = buffer->slice(offset, offset + 16);
offset += 16;
if (parsedKeyID->byteLength() < 16)
continue;
memcpySpan(currentKeyID.mutableSpan(), parsedKeyID->span().first(16));
}
}
uint32_t dataSize = 0;
if (!checkedRead<uint32_t>(dataSize, view, offset, BigEndian))
return false;
if (buffer->byteLength() - offset < dataSize)
return false;
auto parsedData = buffer->slice(offset, offset + dataSize);
offset += dataSize;
m_data.resize(dataSize);
if (parsedData->byteLength() < dataSize)
return false;
memcpySpan(m_data.mutableSpan(), parsedData->span().first(dataSize));
return true;
}
}
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