TestOle10Native.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.poifs.filesystem;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsEqual.equalTo;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
import org.apache.poi.POIDataSamples;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.RecordFormatException;
import org.junit.jupiter.api.Test;

class TestOle10Native {
    private static final POIDataSamples dataSamples = POIDataSamples.getPOIFSInstance();

    @Test
    void testOleNative() throws IOException, Ole10NativeException {
        POIFSFileSystem fs = new POIFSFileSystem(dataSamples.openResourceAsStream("oleObject1.bin"));

        Ole10Native ole = Ole10Native.createFromEmbeddedOleObject(fs);

        assertEquals("File1.svg", ole.getLabel());
        assertEquals("D:\\Documents and Settings\\rsc\\My Documents\\file1.svg", ole.getCommand());
    }

    @Test
    void testFiles() throws IOException, Ole10NativeException {
        File[] files = {
                // bug 51891
                POIDataSamples.getPOIFSInstance().getFile("multimedia.doc"),
                // tika bug 1072
                POIDataSamples.getPOIFSInstance().getFile("20-Force-on-a-current-S00.doc"),
                // other files containing ole10native records ...
                POIDataSamples.getDocumentInstance().getFile("Bug53380_3.doc"),
                POIDataSamples.getDocumentInstance().getFile("Bug47731.doc")
        };

        for (File f : files) {
            try (POIFSFileSystem fs = new POIFSFileSystem(f, true)) {
                List<Entry> entries = new ArrayList<>();
                findOle10(entries, fs.getRoot(), "/");

                for (Entry e : entries) {
                    UnsynchronizedByteArrayOutputStream bosExp = UnsynchronizedByteArrayOutputStream.builder().get();
                    try (InputStream is = ((DirectoryNode) e.getParent()).createDocumentInputStream(e)) {
                        IOUtils.copy(is, bosExp);
                    }

                    Ole10Native ole = Ole10Native.createFromEmbeddedOleObject((DirectoryNode) e.getParent());

                    UnsynchronizedByteArrayOutputStream bosAct = UnsynchronizedByteArrayOutputStream.builder().get();
                    ole.writeOut(bosAct);

                    assertThat(bosExp.toByteArray(), equalTo(bosAct.toByteArray()));
                }
            }
        }
    }

    private void findOle10(List<Entry> entries, DirectoryNode dn, String path) {
        Iterator<Entry> iter = dn.getEntries();
        while (iter.hasNext()) {
            Entry e = iter.next();
            if (Ole10Native.OLE10_NATIVE.equals(e.getName())) {
                if (entries != null) entries.add(e);
                // System.out.println(filename+" : "+path);
            } else if (e.isDirectoryEntry()) {
                findOle10(entries, (DirectoryNode)e, path+e.getName()+"/");
            }
        }
    }

    @Test
    void testOleNativeOOM() throws IOException {
        try (POIFSFileSystem fs = new POIFSFileSystem(dataSamples.openResourceAsStream("60256.bin"))) {
            RecordFormatException ex = assertThrows(
                RecordFormatException.class,
                () -> Ole10Native.createFromEmbeddedOleObject(fs)
            );
            assertTrue(ex.getMessage().contains("Tried to allocate"));
        }
    }

}