/*
* Copyright 2007 ZXing authors
*
* Licensed 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 ntu.com.google.zxing.qrcode.decoder;
import org.junit.Assert;
import org.junit.Test;
/**
* @author Sean Owen
*/
public final class FormatInformationTestCase extends Assert {
private static final int MASKED_TEST_FORMAT_INFO = 0x2BED;
private static final int UNMASKED_TEST_FORMAT_INFO = MASKED_TEST_FORMAT_INFO ^ 0x5412;
@Test
public void testBitsDiffering() {
assertEquals(0, FormatInformation.numBitsDiffering(1, 1));
assertEquals(1, FormatInformation.numBitsDiffering(0, 2));
assertEquals(2, FormatInformation.numBitsDiffering(1, 2));
assertEquals(32, FormatInformation.numBitsDiffering(-1, 0));
}
@Test
public void testDecode() {
// Normal case
FormatInformation expected =
FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
assertEquals((byte) 0x07, expected.getDataMask());
assertSame(ErrorCorrectionLevel.Q, expected.getErrorCorrectionLevel());
// where the code forgot the mask!
assertEquals(expected,
FormatInformation.decodeFormatInformation(UNMASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO));
}
@Test
public void testDecodeWithBitDifference() {
FormatInformation expected =
FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
// 1,2,3,4 bits difference
assertEquals(expected, FormatInformation.decodeFormatInformation(
MASKED_TEST_FORMAT_INFO ^ 0x01, MASKED_TEST_FORMAT_INFO ^ 0x01));
assertEquals(expected, FormatInformation.decodeFormatInformation(
MASKED_TEST_FORMAT_INFO ^ 0x03, MASKED_TEST_FORMAT_INFO ^ 0x03));
assertEquals(expected, FormatInformation.decodeFormatInformation(
MASKED_TEST_FORMAT_INFO ^ 0x07, MASKED_TEST_FORMAT_INFO ^ 0x07));
assertNull(FormatInformation.decodeFormatInformation(
MASKED_TEST_FORMAT_INFO ^ 0x0F, MASKED_TEST_FORMAT_INFO ^ 0x0F));
}
@Test
public void testDecodeWithMisread() {
FormatInformation expected =
FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
assertEquals(expected, FormatInformation.decodeFormatInformation(
MASKED_TEST_FORMAT_INFO ^ 0x03, MASKED_TEST_FORMAT_INFO ^ 0x0F));
}
}