poi/src/test/java/org/apache/poi/hssf/record/TestSSTDeserializer.java

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   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hssf.record;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.record.common.UnicodeString;
import org.apache.poi.util.HexRead;
import org.apache.poi.util.IntMapper;
import org.junit.jupiter.api.Test;

/**
 * Exercise the SSTDeserializer class.
 */
final class TestSSTDeserializer {
	private static final int FAKE_SID = -5555;

    private static byte[] concat(byte[] a, byte[] b) {
        byte[] result = new byte[a.length + b.length];
        System.arraycopy(a, 0, result, 0, a.length);
        System.arraycopy(b, 0, result, a.length, b.length);
        return result;
    }

    private static byte[] readSampleHexData(String sampleFileName, String sectionName, int recSid)
    throws IOException {
        InputStream is = HSSFTestDataSamples.openSampleFileStream(sampleFileName);
        byte[] data = HexRead.readData(is, sectionName);
        byte[] result = TestcaseRecordInputStream.mergeDataAndSid(recSid, data.length, data);
        is.close();
        return result;
    }

    @Test
    void testSpanRichTextToPlainText() throws IOException {
        byte[] header = readSampleHexData("richtextdata.txt", "header", FAKE_SID);
        byte[] continueBytes = readSampleHexData("richtextdata.txt", "continue1", ContinueRecord.sid);
        RecordInputStream in = TestcaseRecordInputStream.create(concat(header, continueBytes));


        IntMapper<UnicodeString> strings = new IntMapper<>();
        SSTDeserializer deserializer = new SSTDeserializer( strings );
        deserializer.manufactureStrings(1, in );

        assertEquals( "At a dinner party orAt At At ", strings.get( 0 ) + "" );
    }

    @Test
    void testContinuationWithNoOverlap() throws IOException {
        byte[] header = readSampleHexData("evencontinuation.txt", "header", FAKE_SID);
        byte[] continueBytes = readSampleHexData("evencontinuation.txt", "continue1", ContinueRecord.sid);
        RecordInputStream in = TestcaseRecordInputStream.create(concat(header, continueBytes));

        IntMapper<UnicodeString> strings = new IntMapper<>();
        SSTDeserializer deserializer = new SSTDeserializer( strings );
        deserializer.manufactureStrings( 2, in);

        assertEquals( "At a dinner party or", strings.get( 0 ) + "" );
        assertEquals( "At a dinner party", strings.get( 1 ) + "" );
    }

    /**
     * Strings can actually span across more than one continuation.
     */
    @Test
    void testStringAcross2Continuations() throws IOException {
        byte[] header = readSampleHexData("stringacross2continuations.txt", "header", FAKE_SID);
        byte[] continue1 = readSampleHexData("stringacross2continuations.txt", "continue1", ContinueRecord.sid);
        byte[] continue2 = readSampleHexData("stringacross2continuations.txt", "continue2", ContinueRecord.sid);

        RecordInputStream in = TestcaseRecordInputStream.create(concat(header, concat(continue1, continue2)));

        IntMapper<UnicodeString> strings = new IntMapper<>();
        SSTDeserializer deserializer = new SSTDeserializer( strings );
        deserializer.manufactureStrings( 2, in);

        assertEquals( "At a dinner party or", strings.get(  0 ) + "" );
        assertEquals( "At a dinner partyAt a dinner party", strings.get( 1 ) + "" );
    }

    @Test
    void testExtendedStrings() throws IOException {
        byte[] header = readSampleHexData("extendedtextstrings.txt", "rich-header", FAKE_SID);
        byte[] continueBytes = readSampleHexData("extendedtextstrings.txt", "rich-continue1", ContinueRecord.sid);
        RecordInputStream in = TestcaseRecordInputStream.create(concat(header, continueBytes));

        IntMapper<UnicodeString> strings = new IntMapper<>();
        SSTDeserializer deserializer = new SSTDeserializer( strings );
        deserializer.manufactureStrings( 1, in);

        assertEquals( "At a dinner party orAt At At ", strings.get( 0  ) + "" );


        header = readSampleHexData("extendedtextstrings.txt", "norich-header", FAKE_SID);
        continueBytes = readSampleHexData("extendedtextstrings.txt", "norich-continue1", ContinueRecord.sid);
        in = TestcaseRecordInputStream.create(concat(header, continueBytes));

        strings = new IntMapper<>();
        deserializer = new SSTDeserializer( strings );
        deserializer.manufactureStrings( 1, in);

        assertEquals( "At a dinner party orAt At At ", strings.get( 0 ) + "" );
    }
}