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/*
* Copyright (C) 2022 The Android Open Source Project
*
* 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 com.android.net.module.util
import com.android.net.module.util.BitUtils.appendStringRepresentationOfBitMaskToStringBuilder
import com.android.net.module.util.BitUtils.describeDifferences
import com.android.net.module.util.BitUtils.packBits
import com.android.net.module.util.BitUtils.unpackBits
import kotlin.test.assertEquals
import kotlin.test.assertNull
import kotlin.test.assertTrue
import org.junit.Test
class BitUtilsTests {
@Test
fun testBitPackingTestCase() {
runBitPackingTestCase(0, intArrayOf())
runBitPackingTestCase(1, intArrayOf(0))
runBitPackingTestCase(3, intArrayOf(0, 1))
runBitPackingTestCase(4, intArrayOf(2))
runBitPackingTestCase(63, intArrayOf(0, 1, 2, 3, 4, 5))
runBitPackingTestCase(Long.MAX_VALUE.inv(), intArrayOf(63))
runBitPackingTestCase(Long.MAX_VALUE.inv() + 1, intArrayOf(0, 63))
runBitPackingTestCase(Long.MAX_VALUE.inv() + 2, intArrayOf(1, 63))
}
fun runBitPackingTestCase(packedBits: Long, bits: IntArray) {
assertEquals(packedBits, packBits(bits))
assertTrue(bits contentEquals unpackBits(packedBits))
}
@Test
fun testAppendStringRepresentationOfBitMaskToStringBuilder() {
runTestAppendStringRepresentationOfBitMaskToStringBuilder("", 0)
runTestAppendStringRepresentationOfBitMaskToStringBuilder("BIT0", 0b1)
runTestAppendStringRepresentationOfBitMaskToStringBuilder("BIT1&BIT2&BIT4", 0b10110)
runTestAppendStringRepresentationOfBitMaskToStringBuilder(
"BIT0&BIT60&BIT61&BIT62&BIT63",
(0b11110000_00000000_00000000_00000000 shl 32) +
0b00000000_00000000_00000000_00000001)
}
fun runTestAppendStringRepresentationOfBitMaskToStringBuilder(expected: String, bitMask: Long) {
StringBuilder().let {
appendStringRepresentationOfBitMaskToStringBuilder(it, bitMask, { i -> "BIT$i" }, "&")
assertEquals(expected, it.toString())
}
}
@Test
fun testDescribeDifferences() {
fun describe(a: Long, b: Long) = describeDifferences(a, b, Integer::toString)
assertNull(describe(0, 0))
assertNull(describe(5, 5))
assertNull(describe(Long.MAX_VALUE, Long.MAX_VALUE))
assertEquals("+0", describe(0, 1))
assertEquals("-0", describe(1, 0))
assertEquals("+0+2", describe(0, 5))
assertEquals("+2", describe(1, 5))
assertEquals("-0+2", describe(1, 4))
fun makeField(vararg i: Int) = i.sumOf { 1L shl it }
assertEquals("-0-4-6-9+1+3+11", describe(makeField(0, 4, 6, 9), makeField(1, 3, 11)))
assertEquals("-1-5-9+6+8", describe(makeField(0, 1, 3, 4, 5, 9), makeField(0, 3, 4, 6, 8)))
}
}
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