TestHDGFLZW.java
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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);
}
}