testhdgflzw.java

介绍java核心技术的pio编程方法以及基本概念

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   See the License for the specific language governing permissions and
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*/
package org.apache.poi.hdgf;

import java.io.ByteArrayInputStream;

import junit.framework.TestCase;

public class TestHDGFLZW extends TestCase {
	public static final byte[] testTrailerComp = new byte[] {
		123,      // *mask bit*
		-60, 2, 
		-21, -16, // 3 @ 4093
		1, 0, 0, -72, 
		-13, -16, // 3 @ 5
		78,       // *mask bit*
		-32, -5,  // 14 @ 4082 
		1, 0, 3, 
		-21, -16, // 3 @ 4093
		10, 5,    // 8 @ 28
		4, 
		-21, -16, // 3 @ 4093
		21,       // *mask bit* 
		9, 
		-21, -16, // 3 @ 4093 
		103, -21, -16, 34, 
		-36, -1,  // 18 @ 4078
		52, 15,   // 18 @ 70 
		70, 15,   // 18 @ 88 
		120,      // *mask bit*
		88, 15,   // 18 @ 106 
		-7, -2,   // 17 @ 11 
		-28, -9,  // 10 @ 4086
		-123, 21, 0, 44, 
		-122, 1,  // 4 @ 152 
		-4,       // *mask bit* 
		104, 15,  // 18 @ 122 
		-24, -13, 40, -98, 32, 
		78, 102, -67, -1, -2, -30, 64, 40, -67, -113, -73, 116, -98, 
		-85, 2, 66, 123, 9, 109, -85, 2, -89, 14, -56, -69, -83, -79, 
		-34, -3, 120, 110, 75, -9, -10, 20, -6, -25, -12, 22, -21, -16, 
		-12, -81, 67, 1, -128, -70, -21, -16, 84, -21, -16, 70, 0, 23, 
		-21, -16, 76, 47, -40, 79, 1, -44, -21, -16, 32, 3, 18, 12, 17, 
		-43, -68, 17, 16, -8, 21, 22, -1, -21, -16, -84, -1, -35, 79, 
		-9, -10, 96, 0, 46, -21, -16, 44, -39, -41, 79, 1, 119, -13, 
		-16, -106, -13, -16, 84, 0, 125, 26, -21, -16, 68, -38, 79, 1, 
		17, 10, 0, -97, 50, 10, 0, 0, -42, -108, 15, 118, 31, 0, -3, 29, 
		-21, -16, -100, -25, 79, 1, -18, 97, -36, 76, 16, -21, -16, 86, 
		0, 36, -5, 1, -5, 79, 63, 1, -124, 98, 0, 0, 28, 3, 20, -34, -3, 
		125, 33, -21, -16, 100, -4, 79, 1, -92, -91, 16, -22, 24, 19, 41, 
		-21, -16, -44, -59, 16, 108, 100, 0, -21, 0, 71, -105, 18, 39, 85, 
		17, -3, 79, 1, 95, -108, 113, 0, 0, 104, 3, 18, 49, 49, 17, -1, 64, 
		85, 1, 0, 114, 0, 0, -93, -36, -21, -16, 100, 31, 0, 0, -40, -21, 
		-16, -92, 66, 127, 85, 1, 98, 119, 0, 0, -48, 79, 18, -3, 50, -17, 
		1, 67, 85, 1, 81, -127, 0, -41, 0, 14, 6, 4, 17, 63, -63, 17, 68, 
		85, -65, 1, 30, -120, 0, 0, 42, 79, 18, 68, 126, -21, -16, -76, 69, 
		85, 1, 102, -119, 72, 37, 0, 97, 33 };
	public static final byte[] testTrailerDecomp = new byte[] {
		-60, 2, 0, 0, 0, 1, 0, 0, -72, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 1, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 
		0, 9, 0, 0, 0, 103, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		-123, 21, 0, 44, -123, 21, 0, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -98, 32, 78, 102, -67, 
		-2, -30, 64, 40, -67, -113, -73, 116, -67, -2, -30, 64, 40, 66, 
		123, 9, 109, -67, -2, -30, 64, 40, -98, 32, 78, 102, -67, -2, -30, 
		64, 40, -67, -113, -73, 116, -67, -2, -30, 64, -56, -83, -79, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 120, 110, 75, 1, 0, 0, 0, 
		0, 0, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 22, 0, 0, 0, -12, -81, 67, 
		1, -128, 0, 0, 0, 84, 0, 0, 0, 70, 0, 23, 0, 0, 0, 76, -40, 79, 1, 
		-44, 0, 0, 0, 32, 0, 0, 0, 84, 0, 23, 0, 0, 0, -68, -40, 79, 1, -8, 
		0, 0, 0, 32, 0, 0, 0, 84, 0, -1, 0, 0, 0, -84, -1, 79, 1, 0, 0, 0, 
		0, 0, 0, 0, 0, 96, 0, 46, 0, 0, 0, 44, -39, 79, 1, 119, 1, 0, 0, 
		-106, 1, 0, 0, 84, 0, 26, 0, 0, 0, 68, -38, 79, 1, 17, 3, 0, 0, 
		50, 10, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		29, 0, 0, 0, -100, -25, 79, 1, -18, 97, 0, 0, -106, 0, 0, 0, 86, 0, 
		36, 0, 0, 0, -12, -5, 79, 1, -124, 98, 0, 0, 28, 0, 0, 0, 84, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 0, 0, 0, 100, 
		-4, 79, 1, -92, 98, 0, 0, 32, 0, 0, 0, 84, 0, 41, 0, 0, 0, -44, -4, 
		79, 1, 108, 100, 0, 0, 71, 0, 0, 0, 86, 0, 39, 0, 0, 0, 68, -3, 79, 
		1, -108, 113, 0, 0, 104, 0, 0, 0, 84, 0, 49, 0, 0, 0, -84, 64, 85, 
		1, 0, 114, 0, 0, -93, 0, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
		0, 0, 0, 0, 0, 0, 0, 0, 0, -40, 0, 0, 0, -92, 66, 85, 1, 98, 119, 
		0, 0, -48, 1, 0, 0, 84, 0, 50, 0, 0, 0, 20, 67, 85, 1, 81, -127, 
		0, 0, 14, 6, 0, 0, 84, 0, 63, 0, 0, 0, 100, 68, 85, 1, 30, -120, 
		0, 0, 42, 1, 0, 0, 84, 0, 68, 0, 0, 0, -76, 69, 85, 1, 102, -119, 
		0, 0, 42, 1, 0, 0, 84, 0, 0, 0, 0, 0
	};
	
	public void testFromToInt() throws Exception {
		byte b255 = -1;
		assertEquals(255, HDGFLZW.fromByte(b255));
		assertEquals(-1, HDGFLZW.fromInt( HDGFLZW.fromByte(b255) ));
		assertEquals(-1, HDGFLZW.fromInt( 255 ));
		
		byte b11 = 11;
		assertEquals(11, HDGFLZW.fromByte(b11));
		assertEquals(11, HDGFLZW.fromInt( HDGFLZW.fromByte(b11) ));
		assertEquals(11, HDGFLZW.fromInt( 11 ));
		
		byte b0 = 0;
		assertEquals(0, HDGFLZW.fromByte(b0));
		assertEquals(0, HDGFLZW.fromInt( HDGFLZW.fromByte(b0) ));
		assertEquals(0, HDGFLZW.fromInt( 0 ));
		
		byte b127 = 127;
		assertEquals(127, HDGFLZW.fromByte(b127));
		assertEquals(127, HDGFLZW.fromInt( HDGFLZW.fromByte(b127) ));
		assertEquals(127, HDGFLZW.fromInt( 127 ));
		
		byte b128 = -128;
		assertEquals(128, HDGFLZW.fromByte(b128));
		assertEquals(-128, HDGFLZW.fromInt( HDGFLZW.fromByte(b128) ));
		assertEquals(-128, HDGFLZW.fromInt( 128 ));
	}
	
	public void testCounts() throws Exception {
		assertEquals(339, testTrailerComp.length);
		assertEquals(632, testTrailerDecomp.length);
		
		// Decode it using our engine
		HDGFLZW lzw = new HDGFLZW();
		byte[] dec = lzw.decode(new ByteArrayInputStream(testTrailerComp));
		
		// Check it's of the right size
		assertEquals(632, dec.length);

/*		
		// Encode it again using our engine
		byte[] comp = lzw.compress(new ByteArrayInputStream(testTrailerDecomp));
		
		// Check it's of the right size
		assertEquals(339, comp.length);
*/
	}
	
	public void testDecompress() throws Exception {
		assertEquals(339, testTrailerComp.length);
		assertEquals(632, testTrailerDecomp.length);
		
		// Decode it using our engine
		HDGFLZW lzw = new HDGFLZW();
		byte[] dec = lzw.decode(new ByteArrayInputStream(testTrailerComp));
		
		// Now check it's the right data
		assertEquals(632, dec.length);
		for(int i=0; i<dec.length; i++) {
			if(dec[i] != testTrailerDecomp[i]) 
				System.err.println(i + "\t" + dec[i] + "\t" + testTrailerDecomp[i]);
		}
	}
	
	public void DISABLEDtestCompress() throws Exception {
		assertEquals(339, testTrailerComp.length);
		assertEquals(632, testTrailerDecomp.length);
		
		// Compress it using our engine
		HDGFLZW lzw = new HDGFLZW();
		byte[] comp = lzw.compress(new ByteArrayInputStream(testTrailerDecomp));
		
		// Now check it's the right data
		assertEquals(339, comp.length);
		for(int i=0; i<comp.length; i++) {
			if(comp[i] != testTrailerComp[i]) 
				System.err.println(i + "\t" + comp[i] + "\t" + testTrailerComp[i]);
		}
	}
}