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 junit.framework.TestCase;
23 * @author satorux@google.com (Satoru Takabayashi) - creator
24 * @author dswitkin@google.com (Daniel Switkin) - ported from C++
26 public class BitVectorTestCase extends TestCase {
28 private static long getUnsignedInt(BitArray v, int index) {
30 for (int i = 0, offset = index << 3; i < 32; i++) {
31 if (v.get(offset + i)) {
32 result |= 1L << (31 - i);
38 public void testAppendBit() {
39 BitArray v = new BitArray();
40 assertEquals(0, v.getSizeInBytes());
43 assertEquals(1, v.getSize());
44 assertEquals(0x80000000L, getUnsignedInt(v, 0));
47 assertEquals(2, v.getSize());
48 assertEquals(0x80000000L, getUnsignedInt(v, 0));
51 assertEquals(3, v.getSize());
52 assertEquals(0xa0000000L, getUnsignedInt(v, 0));
55 assertEquals(4, v.getSize());
56 assertEquals(0xa0000000L, getUnsignedInt(v, 0));
59 assertEquals(5, v.getSize());
60 assertEquals(0xa8000000L, getUnsignedInt(v, 0));
63 assertEquals(6, v.getSize());
64 assertEquals(0xa8000000L, getUnsignedInt(v, 0));
67 assertEquals(7, v.getSize());
68 assertEquals(0xaa000000L, getUnsignedInt(v, 0));
71 assertEquals(8, v.getSize());
72 assertEquals(0xaa000000L, getUnsignedInt(v, 0));
75 assertEquals(9, v.getSize());
76 assertEquals(0xaa800000L, getUnsignedInt(v, 0));
79 assertEquals(10, v.getSize());
80 assertEquals(0xaa800000L, getUnsignedInt(v, 0));
83 public void testAppendBits() {
85 BitArray v = new BitArray();
87 assertEquals(1, v.getSize());
88 assertEquals(0x80000000L, getUnsignedInt(v, 0));
91 BitArray v = new BitArray();
92 v.appendBits(0xff, 8);
93 assertEquals(8, v.getSize());
94 assertEquals(0xff000000L, getUnsignedInt(v, 0));
97 BitArray v = new BitArray();
98 v.appendBits(0xff7, 12);
99 assertEquals(12, v.getSize());
100 assertEquals(0xff700000L, getUnsignedInt(v, 0));
104 public void testNumBytes() {
105 BitArray v = new BitArray();
106 assertEquals(0, v.getSizeInBytes());
108 // 1 bit was added in the vector, so 1 byte should be consumed.
109 assertEquals(1, v.getSizeInBytes());
111 assertEquals(1, v.getSizeInBytes());
113 assertEquals(2, v.getSizeInBytes());
115 // We now have 17 bits, so 3 bytes should be consumed.
116 assertEquals(3, v.getSizeInBytes());
119 public void testAppendBitVector() {
120 BitArray v1 = new BitArray();
121 v1.appendBits(0xbe, 8);
122 BitArray v2 = new BitArray();
123 v2.appendBits(0xef, 8);
124 v1.appendBitArray(v2);
125 // beef = 1011 1110 1110 1111
126 assertEquals(" X.XXXXX. XXX.XXXX", v1.toString());
129 public void testXOR() {
131 BitArray v1 = new BitArray();
132 v1.appendBits(0x5555aaaa, 32);
133 BitArray v2 = new BitArray();
134 v2.appendBits(0xaaaa5555, 32);
136 assertEquals(0xffffffffL, getUnsignedInt(v1, 0));
139 BitArray v1 = new BitArray();
140 v1.appendBits(0x2a, 7); // 010 1010
141 BitArray v2 = new BitArray();
142 v2.appendBits(0x55, 7); // 101 0101
144 assertEquals(0xfe000000L, getUnsignedInt(v1, 0)); // 1111 1110
148 public void testAt() {
149 BitArray v = new BitArray();
150 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
151 assertTrue(v.get(0));
152 assertTrue(v.get(1));
153 assertFalse(v.get(2));
154 assertTrue(v.get(3));
156 assertTrue(v.get(4));
157 assertTrue(v.get(5));
158 assertTrue(v.get(6));
159 assertFalse(v.get(7));
161 assertTrue(v.get(8));
162 assertFalse(v.get(9));
163 assertTrue(v.get(10));
164 assertFalse(v.get(11));
166 assertTrue(v.get(12));
167 assertTrue(v.get(13));
168 assertFalse(v.get(14));
169 assertTrue(v.get(15));
172 public void testToString() {
173 BitArray v = new BitArray();
174 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
175 assertEquals(" XX.XXXX. X.X.XX.X", v.toString());