log4j/src/testcases/org/apache/poi/hssf/record/TestRecordInputStream.java

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

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

import org.apache.poi.util.HexRead;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

/**
 * Tests for {@link RecordInputStream}
 */
final class TestRecordInputStream {

	/**
	 * Data inspired by attachment 22626 of bug 45866<br>
	 * A unicode string of 18 chars, with a continue record where the compression flag changes
	 */
	private static final String HED_DUMP1 = ""
			+ "1A 59 00 8A 9E 8A " // 3 uncompressed unicode chars
			+ "3C 00 " // Continue sid
			+ "10 00 " // rec size 16 (1+15)
			+ "00"	// next chunk is compressed
			+ "20 2D 20 4D 75 6C 74 69 6C 69 6E 67 75 61 6C " // 15 chars
	;
	/**
	 * same string re-arranged
	 */
	private static final String HED_DUMP2 = ""
			// 15 chars at end of current record
			+ "4D 75 6C 74 69 6C 69 6E 67 75 61 6C 20 2D 20"
			+ "3C 00 " // Continue sid
			+ "07 00 " // rec size 7 (1+6)
			+ "01"	// this bit uncompressed
			+ "1A 59 00 8A 9E 8A " // 3 uncompressed unicode chars
	;


	@Test
	void testChangeOfCompressionFlag_bug25866() {
		byte[] changingFlagSimpleData = HexRead.readFromString(""
				+ "AA AA "  // fake SID
				+ "06 00 "  // first rec len 6
				+ HED_DUMP1
				);
		RecordInputStream in = TestcaseRecordInputStream.create(changingFlagSimpleData);

		// bug 45866 - compressByte in continue records must be 1 while reading unicode LE string
		String actual  = in.readUnicodeLEString(18);
		assertEquals("\u591A\u8A00\u8A9E - Multilingual", actual);
	}

	@Test
	void testChangeFromUnCompressedToCompressed() {
		byte[] changingFlagSimpleData = HexRead.readFromString(""
				+ "AA AA "  // fake SID
				+ "0F 00 "  // first rec len 15
				+ HED_DUMP2
				);
		RecordInputStream in = TestcaseRecordInputStream.create(changingFlagSimpleData);
		String actual = in.readCompressedUnicode(18);
		assertEquals("Multilingual - \u591A\u8A00\u8A9E", actual);
	}

	@Test
	void testReadString() {
		byte[] changingFlagFullData = HexRead.readFromString(""
				+ "AA AA "  // fake SID
				+ "12 00 "  // first rec len 18 (15 + next 3 bytes)
				+ "12 00 "  // total chars 18
				+ "00 "	 // this bit compressed
				+ HED_DUMP2
				);
		RecordInputStream in = TestcaseRecordInputStream.create(changingFlagFullData);
		String actual = in.readString();
		assertEquals("Multilingual - \u591A\u8A00\u8A9E", actual);
	}

	@ParameterizedTest
	@CsvSource({"1, 200", "0, 200", "999999999, 200", HeaderRecord.sid+", 200"})
	void testLeftoverDataException(int sid, int remainingByteCount) {
	    // just ensure that the exception is created correctly, even with unknown sids
		assertDoesNotThrow(() -> new RecordInputStream.LeftoverDataException(sid, remainingByteCount));
	}
}