Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2016-present Open Networking Foundation |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 3 | * |
| 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 |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 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. |
| 15 | */ |
| 16 | |
| 17 | package org.onlab.util; |
| 18 | |
| 19 | import com.google.common.testing.EqualsTester; |
Yuta HIGUCHI | 6800ced | 2017-11-20 11:15:37 -0800 | [diff] [blame] | 20 | import org.apache.commons.lang3.RandomUtils; |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 21 | import org.junit.Assert; |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 22 | import org.junit.Rule; |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 23 | import org.junit.Test; |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 24 | import org.junit.rules.ExpectedException; |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 25 | |
| 26 | import java.nio.ByteBuffer; |
| 27 | import java.nio.ByteOrder; |
Daniele Moro | 53a3cdf | 2021-05-17 14:49:31 +0200 | [diff] [blame] | 28 | import java.util.Arrays; |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 29 | import java.util.Random; |
| 30 | |
Carmelo Cascone | d047bd2 | 2017-08-29 21:36:07 +0200 | [diff] [blame] | 31 | import static java.lang.Integer.max; |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 32 | import static java.lang.String.format; |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 33 | import static org.hamcrest.MatcherAssert.assertThat; |
| 34 | import static org.hamcrest.Matchers.equalTo; |
| 35 | import static org.hamcrest.Matchers.is; |
| 36 | |
| 37 | public class ImmutableByteSequenceTest { |
Carmelo Cascone | d047bd2 | 2017-08-29 21:36:07 +0200 | [diff] [blame] | 38 | public static final int MIN_RAND_FIT_VALUE = 0xf; |
| 39 | public static final int MAX_RAND_FIT_VALUE = 0x7fffffff; |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 40 | @Rule |
| 41 | public ExpectedException thrown = ExpectedException.none(); |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 42 | |
| 43 | @Test |
| 44 | public void testCopy() throws Exception { |
| 45 | |
| 46 | byte byteValue = (byte) 1; |
Yuta HIGUCHI | 6800ced | 2017-11-20 11:15:37 -0800 | [diff] [blame] | 47 | short shortValue = byteValue; |
| 48 | int intValue = byteValue; |
| 49 | long longValue = byteValue; |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 50 | byte[] arrayValue = new byte[64]; |
| 51 | arrayValue[63] = byteValue; |
| 52 | ByteBuffer bufferValue = ByteBuffer.allocate(64).put(arrayValue); |
| 53 | |
| 54 | ImmutableByteSequence bsByte = ImmutableByteSequence.copyFrom(byteValue); |
| 55 | ImmutableByteSequence bsShort = ImmutableByteSequence.copyFrom(shortValue); |
| 56 | ImmutableByteSequence bsInt = ImmutableByteSequence.copyFrom(intValue); |
| 57 | ImmutableByteSequence bsLong = ImmutableByteSequence.copyFrom(longValue); |
| 58 | ImmutableByteSequence bsArray = ImmutableByteSequence.copyFrom(arrayValue); |
| 59 | ImmutableByteSequence bsBuffer = ImmutableByteSequence.copyFrom(bufferValue); |
| 60 | |
| 61 | assertThat("byte sequence of a byte value must have size 1", |
| 62 | bsByte.size(), is(equalTo(1))); |
| 63 | assertThat("byte sequence of a short value must have size 2", |
| 64 | bsShort.size(), is(equalTo(2))); |
| 65 | assertThat("byte sequence of an int value must have size 4", |
| 66 | bsInt.size(), is(equalTo(4))); |
| 67 | assertThat("byte sequence of a long value must have size 8", |
| 68 | bsLong.size(), is(equalTo(8))); |
| 69 | assertThat("byte sequence of a byte array value must have same size of the array", |
| 70 | bsArray.size(), is(equalTo(arrayValue.length))); |
| 71 | assertThat("byte sequence of a byte buffer value must have same size of the buffer", |
| 72 | bsBuffer.size(), is(equalTo(bufferValue.capacity()))); |
| 73 | |
| 74 | String errStr = "incorrect byte sequence value"; |
| 75 | |
| 76 | assertThat(errStr, bsByte.asArray()[0], is(equalTo(byteValue))); |
| 77 | assertThat(errStr, bsShort.asArray()[1], is(equalTo(byteValue))); |
| 78 | assertThat(errStr, bsInt.asArray()[3], is(equalTo(byteValue))); |
| 79 | assertThat(errStr, bsLong.asArray()[7], is(equalTo(byteValue))); |
| 80 | assertThat(errStr, bsArray.asArray()[63], is(equalTo(byteValue))); |
| 81 | assertThat(errStr, bsBuffer.asArray()[63], is(equalTo(byteValue))); |
| 82 | } |
| 83 | |
| 84 | @Test |
Daniele Moro | 53a3cdf | 2021-05-17 14:49:31 +0200 | [diff] [blame] | 85 | public void testCopyAndFit() throws Exception { |
| 86 | int originalByteWidth = 3; |
| 87 | int paddedByteWidth = 4; |
| 88 | int trimmedByteWidth = 2; |
| 89 | int indexFirstNonZeroByte = 1; |
| 90 | |
| 91 | byte byteValue = (byte) 1; |
| 92 | byte[] arrayValue = new byte[originalByteWidth]; |
| 93 | arrayValue[indexFirstNonZeroByte] = byteValue; |
| 94 | ByteBuffer bufferValue = ByteBuffer.allocate(originalByteWidth).put(arrayValue); |
| 95 | |
| 96 | ImmutableByteSequence bsBuffer = ImmutableByteSequence.copyAndFit( |
| 97 | bufferValue, originalByteWidth * 8); |
| 98 | ImmutableByteSequence bsBufferTrimmed = ImmutableByteSequence.copyAndFit( |
| 99 | bufferValue, trimmedByteWidth * 8); |
| 100 | ImmutableByteSequence bsBufferPadded = ImmutableByteSequence.copyAndFit( |
| 101 | bufferValue, paddedByteWidth * 8); |
| 102 | |
| 103 | assertThat("byte sequence of the byte buffer must be 3 bytes long", |
| 104 | bsBuffer.size(), is(equalTo(originalByteWidth))); |
| 105 | assertThat("byte sequence of the byte buffer must be 3 bytes long", |
| 106 | bsBufferTrimmed.size(), is(equalTo(trimmedByteWidth))); |
| 107 | assertThat("byte sequence of the byte buffer must be 3 bytes long", |
| 108 | bsBufferPadded.size(), is(equalTo(paddedByteWidth))); |
| 109 | |
| 110 | String errStr = "incorrect byte sequence value"; |
| 111 | |
| 112 | assertThat(errStr, bsBuffer.asArray()[indexFirstNonZeroByte], is(equalTo(byteValue))); |
| 113 | assertThat(errStr, bsBufferTrimmed.asArray()[indexFirstNonZeroByte - 1], is(equalTo(byteValue))); |
| 114 | assertThat(errStr, bsBufferPadded.asArray()[indexFirstNonZeroByte + 1], is(equalTo(byteValue))); |
| 115 | assertThat(errStr, bsBufferPadded.asArray()[paddedByteWidth - 1], is(equalTo((byte) 0x00))); |
| 116 | } |
| 117 | |
| 118 | @Test |
| 119 | public void testCopyAndFitEndianness() throws Exception { |
| 120 | int originalByteWidth = 4; |
| 121 | int indexByteNonZeroBig = 1; |
| 122 | int indexByteNonZeroLittle = 2; |
| 123 | byte byteValue = (byte) 1; |
| 124 | |
| 125 | ByteBuffer bbBigEndian = ByteBuffer |
| 126 | .allocate(originalByteWidth) |
| 127 | .order(ByteOrder.BIG_ENDIAN); |
| 128 | bbBigEndian.put(indexByteNonZeroBig, byteValue); |
| 129 | ImmutableByteSequence bsBufferCopyBigEndian = |
| 130 | ImmutableByteSequence.copyAndFit(bbBigEndian, originalByteWidth * 8); |
| 131 | |
| 132 | ByteBuffer bbLittleEndian = ByteBuffer |
| 133 | .allocate(originalByteWidth) |
| 134 | .order(ByteOrder.LITTLE_ENDIAN); |
| 135 | bbLittleEndian.put(indexByteNonZeroLittle, byteValue); |
| 136 | ImmutableByteSequence bsBufferCopyLittleEndian = |
| 137 | ImmutableByteSequence.copyAndFit(bbLittleEndian, originalByteWidth * 8); |
| 138 | |
| 139 | // creates a new sequence from primitive type |
| 140 | byte[] arrayValue = new byte[originalByteWidth]; |
| 141 | arrayValue[indexByteNonZeroBig] = byteValue; |
| 142 | ImmutableByteSequence bsArrayCopy = |
| 143 | ImmutableByteSequence.copyFrom(arrayValue); |
| 144 | |
| 145 | new EqualsTester() |
| 146 | // big-endian byte array cannot be equal to little-endian array |
| 147 | .addEqualityGroup(bbBigEndian.array()) |
| 148 | .addEqualityGroup(bbLittleEndian.array()) |
| 149 | // all byte sequences must be equal |
| 150 | .addEqualityGroup(bsBufferCopyBigEndian, |
| 151 | bsBufferCopyLittleEndian, |
| 152 | bsArrayCopy) |
| 153 | // byte buffer views of all sequences must be equal |
| 154 | .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer(), |
| 155 | bsBufferCopyLittleEndian.asReadOnlyBuffer(), |
| 156 | bsArrayCopy.asReadOnlyBuffer()) |
| 157 | // byte buffer orders of all sequences must be ByteOrder.BIG_ENDIAN |
| 158 | .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer().order(), |
| 159 | bsBufferCopyLittleEndian.asReadOnlyBuffer().order(), |
| 160 | bsArrayCopy.asReadOnlyBuffer().order(), |
| 161 | ByteOrder.BIG_ENDIAN) |
| 162 | .testEquals(); |
| 163 | } |
| 164 | |
| 165 | @Test |
| 166 | public void testIllegalCopyAndFit() throws Exception { |
| 167 | int originalByteWidth = 3; |
| 168 | int trimmedByteWidth = 1; |
| 169 | int indexFirstNonZeroByte = 1; |
| 170 | |
| 171 | byte byteValue = (byte) 1; |
| 172 | byte[] arrayValue = new byte[originalByteWidth]; |
| 173 | arrayValue[indexFirstNonZeroByte] = byteValue; |
| 174 | ByteBuffer bufferValue = ByteBuffer.allocate(originalByteWidth).put(arrayValue); |
| 175 | |
| 176 | try { |
| 177 | ImmutableByteSequence.copyAndFit(bufferValue, trimmedByteWidth * 8); |
| 178 | Assert.fail(format("Expect ByteSequenceTrimException due to value = %s and bitWidth %d", |
| 179 | Arrays.toString(arrayValue), trimmedByteWidth * 8)); |
| 180 | } catch (ImmutableByteSequence.ByteSequenceTrimException e) { |
| 181 | // We expect this. |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | @Test |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 186 | public void testEndianness() throws Exception { |
| 187 | |
Yuta HIGUCHI | 6800ced | 2017-11-20 11:15:37 -0800 | [diff] [blame] | 188 | long longValue = RandomUtils.nextLong(); |
Carmelo Cascone | 6b32c99 | 2016-04-13 11:53:09 -0700 | [diff] [blame] | 189 | |
| 190 | // creates a new sequence from a big-endian buffer |
| 191 | ByteBuffer bbBigEndian = ByteBuffer |
| 192 | .allocate(8) |
| 193 | .order(ByteOrder.BIG_ENDIAN) |
| 194 | .putLong(longValue); |
| 195 | ImmutableByteSequence bsBufferCopyBigEndian = |
| 196 | ImmutableByteSequence.copyFrom(bbBigEndian); |
| 197 | |
| 198 | // creates a new sequence from a little-endian buffer |
| 199 | ByteBuffer bbLittleEndian = ByteBuffer |
| 200 | .allocate(8) |
| 201 | .order(ByteOrder.LITTLE_ENDIAN) |
| 202 | .putLong(longValue); |
| 203 | ImmutableByteSequence bsBufferCopyLittleEndian = |
| 204 | ImmutableByteSequence.copyFrom(bbLittleEndian); |
| 205 | |
| 206 | // creates a new sequence from primitive type |
| 207 | ImmutableByteSequence bsLongCopy = |
| 208 | ImmutableByteSequence.copyFrom(longValue); |
| 209 | |
| 210 | |
| 211 | new EqualsTester() |
| 212 | // big-endian byte array cannot be equal to little-endian array |
| 213 | .addEqualityGroup(bbBigEndian.array()) |
| 214 | .addEqualityGroup(bbLittleEndian.array()) |
| 215 | // all byte sequences must be equal |
| 216 | .addEqualityGroup(bsBufferCopyBigEndian, |
| 217 | bsBufferCopyLittleEndian, |
| 218 | bsLongCopy) |
| 219 | // byte buffer views of all sequences must be equal |
| 220 | .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer(), |
| 221 | bsBufferCopyLittleEndian.asReadOnlyBuffer(), |
| 222 | bsLongCopy.asReadOnlyBuffer()) |
| 223 | // byte buffer orders of all sequences must be ByteOrder.BIG_ENDIAN |
| 224 | .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer().order(), |
| 225 | bsBufferCopyLittleEndian.asReadOnlyBuffer().order(), |
| 226 | bsLongCopy.asReadOnlyBuffer().order(), |
| 227 | ByteOrder.BIG_ENDIAN) |
| 228 | .testEquals(); |
| 229 | } |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 230 | |
| 231 | @Test |
| 232 | public void testBitSetMethods() throws Exception { |
| 233 | // All zeros tests |
| 234 | assertThat("3 bytes, all 0's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 235 | ImmutableByteSequence.ofZeros(3), |
| 236 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 237 | new byte[]{0, 0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 238 | assertThat("3 bytes, all 0's via prefix", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 239 | ImmutableByteSequence.prefixZeros(3, 3 * Byte.SIZE), |
| 240 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 241 | new byte[]{0, 0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 242 | |
| 243 | // All ones tests |
| 244 | assertThat("3 bytes, all 1's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 245 | ImmutableByteSequence.ofZeros(3), |
| 246 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 247 | new byte[]{0, 0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 248 | assertThat("3 bytes, all 1's via prefix", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 249 | ImmutableByteSequence.prefixOnes(3, 3 * Byte.SIZE), |
| 250 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 251 | new byte[]{(byte) 0xff, (byte) 0xff, (byte) 0xff})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 252 | |
| 253 | // Zero prefix tests |
| 254 | assertThat("2 bytes, prefixed with 5 0's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 255 | ImmutableByteSequence.prefix(2, 5, (byte) 0), |
| 256 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 257 | new byte[]{(byte) 0x7, (byte) 0xff})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 258 | assertThat("4 bytes, prefixed with 16 0's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 259 | ImmutableByteSequence.prefix(4, 16, (byte) 0), |
| 260 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 261 | new byte[]{0, 0, (byte) 0xff, (byte) 0xff})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 262 | assertThat("4 bytes, prefixed with 20 0's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 263 | ImmutableByteSequence.prefix(4, 20, (byte) 0), |
| 264 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 265 | new byte[]{0, 0, (byte) 0x0f, (byte) 0xff})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 266 | assertThat("8 bytes, prefixed with 36 0's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 267 | ImmutableByteSequence.prefixZeros(8, 38), |
| 268 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 269 | new byte[]{0, 0, 0, 0, (byte) 0x03, (byte) 0xff, (byte) 0xff, (byte) 0xff})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 270 | |
| 271 | // Ones prefix tests |
| 272 | assertThat("2 bytes, prefixed with 5 1's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 273 | ImmutableByteSequence.prefix(2, 5, (byte) 0xff), |
| 274 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 275 | new byte[]{(byte) 0xf8, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 276 | assertThat("4 bytes, prefixed with 16 1's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 277 | ImmutableByteSequence.prefix(4, 16, (byte) 0xff), |
| 278 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 279 | new byte[]{(byte) 0xff, (byte) 0xff, 0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 280 | assertThat("4 bytes, prefixed with 20 1's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 281 | ImmutableByteSequence.prefix(4, 20, (byte) 0xff), |
| 282 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 283 | new byte[]{(byte) 0xff, (byte) 0xff, (byte) 0xf0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 284 | assertThat("8 bytes, prefixed with 10 1's", |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 285 | ImmutableByteSequence.prefixOnes(8, 10), |
| 286 | is(equalTo(ImmutableByteSequence.copyFrom( |
| 287 | new byte[]{(byte) 0xff, (byte) 0xc0, 0, 0, 0, 0, 0, 0})))); |
Brian O'Connor | af1d12e | 2017-08-17 12:21:48 -0700 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | @Test |
| 291 | public void testBadPrefixVal() { |
| 292 | thrown.expect(IllegalArgumentException.class); |
| 293 | thrown.reportMissingExceptionWithMessage( |
| 294 | "Expect IllegalArgumentException due to val = 0x7"); |
| 295 | ImmutableByteSequence.prefix(5, 10, (byte) 0x7); |
| 296 | } |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 297 | |
| 298 | @Test |
| 299 | public void testMsbIndex() { |
| 300 | assertThat("Value 0 should have MSB index -1", |
| 301 | ImmutableByteSequence.copyFrom(0).msbIndex(), is(-1)); |
| 302 | for (int i = 0; i < 63; i++) { |
| 303 | long value = (long) Math.pow(2, i); |
| 304 | assertThat(format("Value %d should have MSB index %d", value, i), |
| 305 | ImmutableByteSequence.copyFrom(value).msbIndex(), is(i)); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | private void checkIllegalFit(ImmutableByteSequence bytes, int bitWidth) { |
| 310 | try { |
Carmelo Cascone | 8a571af | 2018-04-06 23:17:04 -0700 | [diff] [blame] | 311 | bytes.fit(bitWidth); |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 312 | Assert.fail(format("Except ByteSequenceTrimException due to value = %s and bitWidth %d", |
| 313 | bytes.toString(), bitWidth)); |
| 314 | } catch (ImmutableByteSequence.ByteSequenceTrimException e) { |
| 315 | // We expect this. |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | private void checkLegalFit(ImmutableByteSequence bytes, int bitWidth) |
| 320 | throws ImmutableByteSequence.ByteSequenceTrimException { |
Carmelo Cascone | 8a571af | 2018-04-06 23:17:04 -0700 | [diff] [blame] | 321 | ImmutableByteSequence fitBytes = bytes.fit(bitWidth); |
| 322 | ImmutableByteSequence sameBytes = fitBytes.fit(bytes.size() * 8); |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 323 | assertThat(format("Fitted value %s (re-extended to %s) not equal to original value %s", |
| 324 | fitBytes, sameBytes, bytes), |
| 325 | sameBytes, |
| 326 | is(equalTo(bytes))); |
| 327 | } |
| 328 | |
| 329 | @Test |
| 330 | public void testFit() throws ImmutableByteSequence.ByteSequenceTrimException { |
| 331 | // Test fit by forcing a given MSB index. |
| 332 | for (int msbIndex = 0; msbIndex < 32; msbIndex++) { |
| 333 | long value = (long) Math.pow(2, msbIndex); |
| 334 | ImmutableByteSequence bytes = ImmutableByteSequence.copyFrom(value); |
| 335 | checkLegalFit(bytes, msbIndex + 1); |
| 336 | if (msbIndex != 0) { |
| 337 | checkIllegalFit(bytes, msbIndex); |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | @Test |
| 343 | public void testRandomFit() throws ImmutableByteSequence.ByteSequenceTrimException { |
| 344 | // Test fit against the computed MSB index. |
| 345 | Random random = new Random(); |
| 346 | for (int i = 0; i < 1000; i++) { |
Carmelo Cascone | d047bd2 | 2017-08-29 21:36:07 +0200 | [diff] [blame] | 347 | int randValue = random.nextInt((MAX_RAND_FIT_VALUE - MIN_RAND_FIT_VALUE) + 1) + MIN_RAND_FIT_VALUE; |
| 348 | ImmutableByteSequence bytes = ImmutableByteSequence.copyFrom((long) randValue); |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 349 | int msbIndex = bytes.msbIndex(); |
Carmelo Cascone | d047bd2 | 2017-08-29 21:36:07 +0200 | [diff] [blame] | 350 | // Truncate. |
| 351 | checkIllegalFit(bytes, max(msbIndex - random.nextInt(16), 1)); |
| 352 | // Expand. |
| 353 | checkLegalFit(bytes, msbIndex + 2 + random.nextInt(128)); |
| 354 | // Fit to same bit-width of original value. |
Carmelo Cascone | b10194c | 2017-08-23 19:16:51 +0200 | [diff] [blame] | 355 | checkLegalFit(bytes, msbIndex + 1); |
| 356 | } |
| 357 | } |
Carmelo Cascone | 8a571af | 2018-04-06 23:17:04 -0700 | [diff] [blame] | 358 | |
| 359 | @Test |
| 360 | public void testBitwiseOperations() { |
| 361 | Random random = new Random(); |
| 362 | long long1 = random.nextLong(); |
| 363 | long long2 = random.nextLong(); |
| 364 | |
| 365 | ImmutableByteSequence bs1 = ImmutableByteSequence.copyFrom(long1); |
| 366 | ImmutableByteSequence bs2 = ImmutableByteSequence.copyFrom(long2); |
| 367 | |
| 368 | ImmutableByteSequence andBs = bs1.bitwiseAnd(bs2); |
| 369 | ImmutableByteSequence orBs = bs1.bitwiseOr(bs2); |
| 370 | ImmutableByteSequence xorBs = bs1.bitwiseXor(bs2); |
| 371 | |
| 372 | assertThat("Invalid bitwise AND result", |
| 373 | andBs.asReadOnlyBuffer().getLong(), is(long1 & long2)); |
| 374 | assertThat("Invalid bitwise OR result", |
| 375 | orBs.asReadOnlyBuffer().getLong(), is(long1 | long2)); |
| 376 | assertThat("Invalid bitwise XOR result", |
| 377 | xorBs.asReadOnlyBuffer().getLong(), is(long1 ^ long2)); |
| 378 | } |
| 379 | } |