2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.qrcode.encoder;
19 import com.google.zxing.common.BitArray;
20 import org.junit.Assert;
21 import org.junit.Test;
24 * @author satorux@google.com (Satoru Takabayashi) - creator
25 * @author dswitkin@google.com (Daniel Switkin) - ported from C++
27 public class BitVectorTestCase extends Assert {
29 private static long getUnsignedInt(BitArray v, int index) {
31 for (int i = 0, offset = index << 3; i < 32; i++) {
32 if (v.get(offset + i)) {
33 result |= 1L << (31 - i);
40 public void testAppendBit() {
41 BitArray v = new BitArray();
42 assertEquals(0, v.getSizeInBytes());
45 assertEquals(1, v.getSize());
46 assertEquals(0x80000000L, getUnsignedInt(v, 0));
49 assertEquals(2, v.getSize());
50 assertEquals(0x80000000L, getUnsignedInt(v, 0));
53 assertEquals(3, v.getSize());
54 assertEquals(0xa0000000L, getUnsignedInt(v, 0));
57 assertEquals(4, v.getSize());
58 assertEquals(0xa0000000L, getUnsignedInt(v, 0));
61 assertEquals(5, v.getSize());
62 assertEquals(0xa8000000L, getUnsignedInt(v, 0));
65 assertEquals(6, v.getSize());
66 assertEquals(0xa8000000L, getUnsignedInt(v, 0));
69 assertEquals(7, v.getSize());
70 assertEquals(0xaa000000L, getUnsignedInt(v, 0));
73 assertEquals(8, v.getSize());
74 assertEquals(0xaa000000L, getUnsignedInt(v, 0));
77 assertEquals(9, v.getSize());
78 assertEquals(0xaa800000L, getUnsignedInt(v, 0));
81 assertEquals(10, v.getSize());
82 assertEquals(0xaa800000L, getUnsignedInt(v, 0));
86 public void testAppendBits() {
88 BitArray v = new BitArray();
90 assertEquals(1, v.getSize());
91 assertEquals(0x80000000L, getUnsignedInt(v, 0));
94 BitArray v = new BitArray();
95 v.appendBits(0xff, 8);
96 assertEquals(8, v.getSize());
97 assertEquals(0xff000000L, getUnsignedInt(v, 0));
100 BitArray v = new BitArray();
101 v.appendBits(0xff7, 12);
102 assertEquals(12, v.getSize());
103 assertEquals(0xff700000L, getUnsignedInt(v, 0));
108 public void testNumBytes() {
109 BitArray v = new BitArray();
110 assertEquals(0, v.getSizeInBytes());
112 // 1 bit was added in the vector, so 1 byte should be consumed.
113 assertEquals(1, v.getSizeInBytes());
115 assertEquals(1, v.getSizeInBytes());
117 assertEquals(2, v.getSizeInBytes());
119 // We now have 17 bits, so 3 bytes should be consumed.
120 assertEquals(3, v.getSizeInBytes());
124 public void testAppendBitVector() {
125 BitArray v1 = new BitArray();
126 v1.appendBits(0xbe, 8);
127 BitArray v2 = new BitArray();
128 v2.appendBits(0xef, 8);
129 v1.appendBitArray(v2);
130 // beef = 1011 1110 1110 1111
131 assertEquals(" X.XXXXX. XXX.XXXX", v1.toString());
135 public void testXOR() {
137 BitArray v1 = new BitArray();
138 v1.appendBits(0x5555aaaa, 32);
139 BitArray v2 = new BitArray();
140 v2.appendBits(0xaaaa5555, 32);
142 assertEquals(0xffffffffL, getUnsignedInt(v1, 0));
145 BitArray v1 = new BitArray();
146 v1.appendBits(0x2a, 7); // 010 1010
147 BitArray v2 = new BitArray();
148 v2.appendBits(0x55, 7); // 101 0101
150 assertEquals(0xfe000000L, getUnsignedInt(v1, 0)); // 1111 1110
155 public void testAt() {
156 BitArray v = new BitArray();
157 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
158 assertTrue(v.get(0));
159 assertTrue(v.get(1));
160 assertFalse(v.get(2));
161 assertTrue(v.get(3));
163 assertTrue(v.get(4));
164 assertTrue(v.get(5));
165 assertTrue(v.get(6));
166 assertFalse(v.get(7));
168 assertTrue(v.get(8));
169 assertFalse(v.get(9));
170 assertTrue(v.get(10));
171 assertFalse(v.get(11));
173 assertTrue(v.get(12));
174 assertTrue(v.get(13));
175 assertFalse(v.get(14));
176 assertTrue(v.get(15));
180 public void testToString() {
181 BitArray v = new BitArray();
182 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
183 assertEquals(" XX.XXXX. X.X.XX.X", v.toString());