TestBiffDrawingToXml.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.hssf.dev;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.ddf.EscherRecord;
import org.apache.poi.hssf.model.InternalWorkbook;
import org.apache.poi.hssf.record.DrawingGroupRecord;
import org.apache.poi.hssf.record.RecordInputStream;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.util.RecordFormatException;
import org.apache.poi.util.StringUtil;
import org.apache.tools.ant.util.NullOutputStream;

class TestBiffDrawingToXml extends BaseTestIteratingXLS {

    @Override
    protected Map<String, Class<? extends Throwable>> getExcludes() {
        Map<String, Class<? extends Throwable>> excludes = super.getExcludes();
        // unsupported crypto api header
        excludes.put("35897-type4.xls", EncryptedDocumentException.class);
        excludes.put("51832.xls", EncryptedDocumentException.class);
        excludes.put("xor-encryption-abc.xls", EncryptedDocumentException.class);
        excludes.put("password.xls", EncryptedDocumentException.class);
        // HSSFWorkbook cannot open it as well
        excludes.put("43493.xls", RecordInputStream.LeftoverDataException.class);
        excludes.put("44958_1.xls", RecordInputStream.LeftoverDataException.class);
        excludes.put("protected_66115.xls", EncryptedDocumentException.class);
        excludes.put("clusterfuzz-testcase-minimized-POIHSSFFuzzer-5285517825277952.xls", IllegalArgumentException.class);
        excludes.put("clusterfuzz-testcase-minimized-POIHSSFFuzzer-5436547081830400.xls", IllegalArgumentException.class);
        excludes.put("clusterfuzz-testcase-minimized-POIHSSFFuzzer-5889658057523200.xls", IndexOutOfBoundsException.class);
        excludes.put("clusterfuzz-testcase-minimized-POIHSSFFuzzer-4977868385681408.xls", IllegalArgumentException.class);
        excludes.put("clusterfuzz-testcase-minimized-POIHSSFFuzzer-4734163573080064.xls", RecordFormatException.class);
        return excludes;
    }

    // output sheets with specified name
    private static final String[] SHEET_NAMES = {};

    // output sheets with specified indexes
    private static final int[] SHEET_IDX = {};

    // exclude workbook-level records
    private static final boolean EXCLUDE_WORKBOOK = false;


    @Override
    void runOneFile(File pFile) throws Exception {
        try (InputStream inp = new FileInputStream(pFile);
             OutputStream outputStream = NullOutputStream.INSTANCE) {
            writeToFile(outputStream, inp);
        }
    }

    public static void writeToFile(OutputStream fos, InputStream xlsWorkbook) throws IOException {
        try (HSSFWorkbook workbook = new HSSFWorkbook(xlsWorkbook)) {
            InternalWorkbook internalWorkbook = workbook.getInternalWorkbook();
            DrawingGroupRecord r = (DrawingGroupRecord) internalWorkbook.findFirstRecordBySid(DrawingGroupRecord.sid);

            StringBuilder builder = new StringBuilder();
            builder.append("<workbook>\n");
            String tab = "\t";
            if (!EXCLUDE_WORKBOOK && r != null) {
                r.decode();
                List<EscherRecord> escherRecords = r.getEscherRecords();
                for (EscherRecord record : escherRecords) {
                    builder.append(record.toXml(tab));
                }
            }
            int i = 0;
            for (HSSFSheet sheet : getSheets(workbook)) {
                HSSFPatriarch p = sheet.getDrawingPatriarch();
                if (p != null) {
                    builder.append(tab).append("<sheet").append(i).append(">\n");
                    builder.append(p.getBoundAggregate().toXml(tab + "\t"));
                    builder.append(tab).append("</sheet").append(i).append(">\n");
                    i++;
                }
            }
            builder.append("</workbook>\n");
            fos.write(builder.toString().getBytes(StringUtil.UTF8));
        }
    }

    private static List<HSSFSheet> getSheets(HSSFWorkbook workbook) {
        List<Integer> sheetIdx = Arrays.stream(SHEET_IDX).boxed().collect(Collectors.toList());
        List<String> sheetNms = Arrays.stream(SHEET_NAMES).collect(Collectors.toList());

        List<HSSFSheet> list = new ArrayList<>();

        for (Sheet sheet : workbook) {
            if ((sheetIdx.isEmpty() && sheetNms.isEmpty()) ||
                sheetIdx.contains(workbook.getSheetIndex(sheet)) ||
                sheetNms.contains(sheet.getSheetName())
            ) {
                list.add((HSSFSheet)sheet);
            }
        }

        return list;
    }
}