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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include <QtQuick3DUtils/private/qssgmesh_p.h>
++
++ #include <QtCore/QBuffer>
++ #include <QtCore/QByteArray>
++
++ // At fuzzing rates the warnings alone would dominate the run time.
++ static QtMessageHandler mh = qInstallMessageHandler([](QtMsgType, const QMessageLogContext &, const QString &) { });
++
++ extern "C" int LLVMFuzzerTestOneInput(const char *Data, size_t Size)
++ {
++ // No QGuiApplication: nothing on the load path needs one, and if that ever
++ // stops being true the reader has grown a dependency it should not have.
++ QByteArray blob = QByteArray::fromRawData(Data, qsizetype(Size));
++ QBuffer buffer(&blob);
++ if (!buffer.open(QIODevice::ReadOnly))
++ return 0;
++
++ // loadAll() rather than loadMesh() so that the container entry list is
++ // exercised too, not just the first mesh.
++ const QMap<quint32, QSSGMesh::Mesh> meshes = QSSGMesh::Mesh::loadAll(&buffer);
++ for (const QSSGMesh::Mesh &mesh : meshes) {
++ for (const QSSGMesh::Mesh::Subset &subset : mesh.subsets())
++ (void)subset.name.size();
++ }
++ return 0;
++ }