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33 lines
949 B
C++
33 lines
949 B
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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#include "jp2image_int.hpp"
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#include "error.hpp"
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#include "types.hpp"
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#include <cassert>
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namespace Exiv2::Internal {
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bool isValidBoxFileType(const std::vector<uint8_t>& boxData) {
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// BR & MinV are obligatory (4 + 4 bytes). Afterwards we have N compatibility lists (of size 4)
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if (boxData.size() < 8 || ((boxData.size() - 8u) % 4u) != 0) {
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return false;
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}
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const size_t N = (boxData.size() - 8u) / 4u;
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const uint32_t brand = getULong(boxData.data(), bigEndian);
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const uint32_t minorVersion = getULong(boxData.data() + 4, bigEndian);
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bool clWithRightBrand = false;
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for (size_t i = 0; i < N; i++) {
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uint32_t compatibilityList = getULong(boxData.data() + 8 + i * 4, bigEndian);
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if (compatibilityList == brandJp2) {
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clWithRightBrand = true;
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break;
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}
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}
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return (brand == brandJp2 && minorVersion == 0 && clWithRightBrand);
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}
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} // namespace Exiv2::Internal
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