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

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.hssf.record;

import org.apache.poi.util.HexRead;

import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

/**
 * Tests for {@link RecordInputStream}
 *
 * @author Josh Micich
 */
public final class TestRecordInputStream extends TestCase {

	/**
	 * 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
	;
	public void testChangeOfCompressionFlag_bug25866() {
		byte[] changingFlagSimpleData = HexRead.readFromString(""
				+ "AA AA "  // fake SID
				+ "06 00 "  // first rec len 6
				+ HED_DUMP1
				);
		RecordInputStream in = TestcaseRecordInputStream.create(changingFlagSimpleData);
		String actual;
		try {
			actual = in.readUnicodeLEString(18);
		} catch (IllegalArgumentException e) {
			if ("compressByte in continue records must be 1 while reading unicode LE string".equals(e.getMessage())) {
				throw new AssertionFailedError("Identified bug 45866");
			}
				
			throw e;
		}
		assertEquals("\u591A\u8A00\u8A9E - Multilingual", actual);
	}

	public 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);
	}
	
	public 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);
	}

	public void testLeftoverDataException() {
	    // just ensure that the exception is created correctly, even with unknown sids
	    new RecordInputStream.LeftoverDataException(1, 200);
	    new RecordInputStream.LeftoverDataException(0, 200);
        new RecordInputStream.LeftoverDataException(999999999, 200);
	    new RecordInputStream.LeftoverDataException(HeaderRecord.sid, 200);
	}
}