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/* Copyright 2015 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
package org.brotli.dec;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import java.nio.ByteBuffer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for {@link Transform}.
*/
@RunWith(JUnit4.class)
public class TransformTest {
private static long crc64(byte[] data) {
long crc = -1;
for (int i = 0; i < data.length; ++i) {
long c = (crc ^ (long) (data[i] & 0xFF)) & 0xFF;
for (int k = 0; k < 8; k++) {
c = (c >>> 1) ^ (-(c & 1L) & -3932672073523589310L);
}
crc = c ^ (crc >>> 8);
}
return ~crc;
}
@Test
public void testTrimAll() {
byte[] output = new byte[0];
byte[] input = {119, 111, 114, 100}; // "word"
Transform.transformDictionaryWord(
output, 0, ByteBuffer.wrap(input), 0, input.length, 39);
byte[] expectedOutput = new byte[0];
assertArrayEquals(expectedOutput, output);
}
@Test
public void testCapitalize() {
byte[] output = new byte[6];
byte[] input = {113, -61, -90, -32, -92, -86}; // "qæप"
Transform.transformDictionaryWord(
output, 0, ByteBuffer.wrap(input), 0, input.length, 44);
byte[] expectedOutput = {81, -61, -122, -32, -92, -81}; // "QÆय"
assertArrayEquals(expectedOutput, output);
}
@Test
public void testAllTransforms() {
/* This string allows to apply all transforms: head and tail cutting, capitalization and
turning to upper case; all results will be mutually different. */
// "o123456789abcdef"
byte[] testWord = {111, 49, 50, 51, 52, 53, 54, 55, 56, 57, 97, 98, 99, 100, 101, 102};
byte[] output = new byte[2259];
int offset = 0;
for (int i = 0; i < Transform.NUM_TRANSFORMS; ++i) {
offset += Transform.transformDictionaryWord(
output, offset, ByteBuffer.wrap(testWord), 0, testWord.length, i);
output[offset++] = -1;
}
assertEquals(output.length, offset);
assertEquals(8929191060211225186L, crc64(output));
}
}
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