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/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
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
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hdgf;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.ByteArrayInputStream;
import java.util.Arrays;
import org.junit.jupiter.api.Test;
public final class TestHDGFLZW {
public static final byte[] testTrailerComp = {
123, // *mask bit* 1,2,4-7
-60, 2,
-21, -16, // 3 @ 4093
1, 0, 0, -72,
-13, -16, // 3 @ 5
78, // *mask bit* 2,3,4,7
-32, -5, // 14 @ 4082
1, 0, 3,
-21, -16, // 3 @ 4093
10, 5, // 8 @ 28
4,
-21, -16, // 3 @ 4093
21, // *mask bit* 1,3,5
9,
-21, -16, // 3 @ 4093
103,
-21, -16, // 3 @ 4093
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 = {
-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
};
@Test
void testCounts() throws Exception {
assertEquals(339, testTrailerComp.length);
assertEquals(632, testTrailerDecomp.length);
// decompress it using our engine
HDGFLZW lzw = new HDGFLZW();
byte[] dec = lzw.decompress(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);
*/
}
@Test
void testDecompress() throws Exception {
assertEquals(339, testTrailerComp.length);
assertEquals(632, testTrailerDecomp.length);
// decompress it using our engine
HDGFLZW lzw = new HDGFLZW();
byte[] dec = lzw.decompress(new ByteArrayInputStream(testTrailerComp));
// Now check it's the right data
assertArrayEquals(testTrailerDecomp, dec);
}
/**
* Test that we can round-trip a little bit.
* Uses a part short enough that we agree with visio
* on the best way to compress it
*/
@Test
void testCompressMini() throws Exception {
// first 11 bytes compressed = 12 bytes uncompressed
byte[] sourceDecomp = Arrays.copyOf(testTrailerDecomp, 12);
// Compress it using our engine
HDGFLZW lzw = new HDGFLZW();
byte[] comp = lzw.compress(new ByteArrayInputStream(sourceDecomp));
// Now decompress it again
byte[] decomp = lzw.decompress(new ByteArrayInputStream(comp));
// First up, check the round tripping
assertEquals(12, decomp.length);
assertArrayEquals(Arrays.copyOfRange(testTrailerDecomp, 0, decomp.length), decomp);
// Now check the compressed intermediate version
assertEquals(11, comp.length);
assertArrayEquals(Arrays.copyOfRange(testTrailerComp, 0, comp.length), comp);
}
/**
* Tests that we can do several mask pages
*/
@Test
void testCompressMidi() throws Exception {
// First 12 -> 11
// Next 32 -> 13
byte[] sourceDecomp = Arrays.copyOf(testTrailerDecomp, 44);
// Compress it using our engine
HDGFLZW lzw = new HDGFLZW();
byte[] comp = lzw.compress(new ByteArrayInputStream(sourceDecomp));
assertEquals(24, comp.length);
// Now decompress it again
byte[] decomp = lzw.decompress(new ByteArrayInputStream(comp));
// We can only check the round-tripping, as for now
// visio cheats on re-using a block
assertArrayEquals(sourceDecomp, decomp);
}
@Test
void testCompressFull() throws Exception {
assertEquals(339, testTrailerComp.length);
assertEquals(632, testTrailerDecomp.length);
HDGFLZW lzw = new HDGFLZW();
byte[] decomp2 = lzw.decompress(new ByteArrayInputStream(testTrailerComp));
assertArrayEquals(testTrailerDecomp, decomp2);
// Compress it using our engine
byte[] comp = lzw.compress(new ByteArrayInputStream(testTrailerDecomp));
// the compressed binary differs, as the run length searching finds different results
// but the decompressed data is the same
// Now decompress it again
byte[] decomp = lzw.decompress(new ByteArrayInputStream(comp));
assertArrayEquals(testTrailerDecomp, decomp);
}
}
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