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 junit.framework.TestCase;
22 * @author satorux@google.com (Satoru Takabayashi) - creator
23 * @author dswitkin@google.com (Daniel Switkin) - ported from C++
25 public class BitVectorTestCase extends TestCase {
27 private static int getUnsignedByte(BitVector v, int index) {
28 return v.getArray()[index] & 0xff;
31 public void testAppendBit() {
32 BitVector v = new BitVector();
33 assertEquals(0, v.sizeInBytes());
36 assertEquals(1, v.size());
37 assertEquals(0x80, getUnsignedByte(v, 0));
40 assertEquals(2, v.size());
41 assertEquals(0x80, getUnsignedByte(v, 0));
44 assertEquals(3, v.size());
45 assertEquals(0xa0, getUnsignedByte(v, 0));
48 assertEquals(4, v.size());
49 assertEquals(0xa0, getUnsignedByte(v, 0));
52 assertEquals(5, v.size());
53 assertEquals(0xa8, getUnsignedByte(v, 0));
56 assertEquals(6, v.size());
57 assertEquals(0xa8, getUnsignedByte(v, 0));
60 assertEquals(7, v.size());
61 assertEquals(0xaa, getUnsignedByte(v, 0));
64 assertEquals(8, v.size());
65 assertEquals(0xaa, getUnsignedByte(v, 0));
68 assertEquals(9, v.size());
69 assertEquals(0xaa, getUnsignedByte(v, 0));
70 assertEquals(0x80, getUnsignedByte(v, 1));
73 assertEquals(10, v.size());
74 assertEquals(0xaa, getUnsignedByte(v, 0));
75 assertEquals(0x80, getUnsignedByte(v, 1));
78 public void testAppendBits() {
80 BitVector v = new BitVector();
82 assertEquals(1, v.size());
83 assertEquals(0x80, getUnsignedByte(v, 0));
86 BitVector v = new BitVector();
87 v.appendBits(0xff, 8);
88 assertEquals(8, v.size());
89 assertEquals(0xff, getUnsignedByte(v, 0));
92 BitVector v = new BitVector();
93 v.appendBits(0xff7, 12);
94 assertEquals(12, v.size());
95 assertEquals(0xff, getUnsignedByte(v, 0));
96 assertEquals(0x70, getUnsignedByte(v, 1));
100 public void testNumBytes() {
101 BitVector v = new BitVector();
102 assertEquals(0, v.sizeInBytes());
104 // 1 bit was added in the vector, so 1 byte should be consumed.
105 assertEquals(1, v.sizeInBytes());
107 assertEquals(1, v.sizeInBytes());
109 assertEquals(2, v.sizeInBytes());
111 // We now have 17 bits, so 3 bytes should be consumed.
112 assertEquals(3, v.sizeInBytes());
115 public void testAppendBitVector() {
116 BitVector v1 = new BitVector();
117 v1.appendBits(0xbe, 8);
118 BitVector v2 = new BitVector();
119 v2.appendBits(0xef, 8);
120 v1.appendBitVector(v2);
121 // beef = 1011 1110 1110 1111
122 assertEquals("1011111011101111", v1.toString());
125 public void testXOR() {
127 BitVector v1 = new BitVector();
128 v1.appendBits(0x5555aaaa, 32);
129 BitVector v2 = new BitVector();
130 v2.appendBits(0xaaaa5555, 32);
132 assertEquals(0xff, getUnsignedByte(v1, 0));
133 assertEquals(0xff, getUnsignedByte(v1, 1));
134 assertEquals(0xff, getUnsignedByte(v1, 2));
135 assertEquals(0xff, getUnsignedByte(v1, 3));
138 BitVector v1 = new BitVector();
139 v1.appendBits(0x2a, 7); // 010 1010
140 BitVector v2 = new BitVector();
141 v2.appendBits(0x55, 7); // 101 0101
143 assertEquals(0xfe, getUnsignedByte(v1, 0)); // 1111 1110
147 public void testAt() {
148 BitVector v = new BitVector();
149 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
150 assertEquals(1, v.at(0));
151 assertEquals(1, v.at(1));
152 assertEquals(0, v.at(2));
153 assertEquals(1, v.at(3));
155 assertEquals(1, v.at(4));
156 assertEquals(1, v.at(5));
157 assertEquals(1, v.at(6));
158 assertEquals(0, v.at(7));
160 assertEquals(1, v.at(8));
161 assertEquals(0, v.at(9));
162 assertEquals(1, v.at(10));
163 assertEquals(0, v.at(11));
165 assertEquals(1, v.at(12));
166 assertEquals(1, v.at(13));
167 assertEquals(0, v.at(14));
168 assertEquals(1, v.at(15));
171 public void testToString() {
172 BitVector v = new BitVector();
173 v.appendBits(0xdead, 16); // 1101 1110 1010 1101
174 assertEquals("1101111010101101", v.toString());