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/*
* Copyright (C) 2020 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.storage.s2;
import static com.android.storage.testing.MoreAsserts.assertThrows;
import static org.junit.Assert.assertEquals;
import com.android.storage.util.BitwiseUtils;
import org.junit.Test;
public class S2SupportTest {
@Test
public void cellIdToString() {
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(0));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11100000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L));
// Valid face IDs
S2Support.cellIdToString(
0b00010000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b00110000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b01010000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b01110000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b10010000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b10110000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
// Invalid face ID
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11010000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11110000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L));
// Final bit in a bad position.
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11101000_00000000_00000000_00000000_00000000_00000000_00000000_00000000L));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11101010_00000000_00000000_00000000_00000000_00000000_00000000_00000000L));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11101010_10000000_00000000_00000000_00000000_00000000_00000000_00000000L));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11101010_10100000_00000000_00000000_00000000_00000000_00000000_00000000L));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellIdToString(
0b11101010_10100000_00000000_00000000_00000000_00000000_00000000_00000010L));
// Valid
S2Support.cellIdToString(
0b10100100_00000000_00000000_00000000_00000000_00000000_00000000_00000000L);
S2Support.cellIdToString(
0b10100000_00000000_00000000_00000000_00000000_00000000_00000000_00000001L);
}
@Test
public void cellId() {
// Invalid levels
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(-1, 0, 0));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(S2Support.MAX_S2_LEVEL + 1, 0, 0));
// level 0 (face only)
assertCellIdEquals(0b00010000L << 56, S2Support.cellId(0, 0, 0));
assertCellIdEquals(0b00110000L << 56, S2Support.cellId(0, 1, 0));
assertCellIdEquals(0b10110000L << 56, S2Support.cellId(0, S2Support.MAX_FACE_ID, 0));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(0, -1, 0));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(0, S2Support.MAX_FACE_ID + 1, 0));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(0, 0, -1));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(0, 0, 1));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(0, S2Support.MAX_FACE_ID, 1));
// level 1, 2 bits for index.
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(1, -1, 0));
assertCellIdEquals(0b00000100L << 56, S2Support.cellId(1, 0, 0));
assertCellIdEquals(0b00100100L << 56, S2Support.cellId(1, 1, 0));
assertCellIdEquals(0b10100100L << 56, S2Support.cellId(1, S2Support.MAX_FACE_ID, 0));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(1, S2Support.MAX_FACE_ID + 1, 0));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(1, S2Support.MAX_FACE_ID, -1));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(1, 0, -1));
assertCellIdEquals(0b00001100L << 56, S2Support.cellId(1, 0, 1));
assertCellIdEquals(0b00010100L << 56, S2Support.cellId(1, 0, 2));
assertCellIdEquals(0b00011100L << 56, S2Support.cellId(1, 0, 3));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(1, 0, 4));
assertCellIdEquals(0b00101100L << 56, S2Support.cellId(1, 1, 1));
assertCellIdEquals(0b00110100L << 56, S2Support.cellId(1, 1, 2));
assertCellIdEquals(0b00111100L << 56, S2Support.cellId(1, 1, 3));
assertThrows(IllegalArgumentException.class, () -> S2Support.cellId(1, 0, 4));
// Level 30 - 3 face bits + 60 "storage bits" + 1-bit (1)
assertCellIdEquals(
0b00000000_00000000_00000000_00000000_00000000_00000000_00000000_00000001L,
S2Support.cellId(30, 0, 0));
assertCellIdEquals(
0b00100000_00000000_00000000_00000000_00000000_00000000_00000000_00000001L,
S2Support.cellId(30, 1, 0));
assertCellIdEquals(
0b00000000_00000000_00000000_00000000_00000000_00000000_00000000_00000011L,
S2Support.cellId(30, 0, 1));
assertCellIdEquals(
0b00100000_00000000_00000000_00000000_00000000_00000000_00000000_00000011L,
S2Support.cellId(30, 1, 1));
assertCellIdEquals(
0b00011111_11111111_11111111_11111111_11111111_11111111_11111111_11111111L,
S2Support.cellId(30, 0, 0x0FFFFFFFFFFFFFFFL /* (2^61)-1 */));
assertCellIdEquals(
0b00111111_11111111_11111111_11111111_11111111_11111111_11111111_11111111L,
S2Support.cellId(30, 1, 0x0FFFFFFFFFFFFFFFL /* (2^61)-1 */));
assertThrows(IllegalArgumentException.class,
() -> S2Support.cellId(30, 1, 0x1000000000000000L /* 2^61 */));
}
@Test
public void storageBitCountForLevel() {
assertEquals(3, S2Support.storageBitCountForLevel(0));
assertEquals(5, S2Support.storageBitCountForLevel(1));
assertEquals(7, S2Support.storageBitCountForLevel(2));
assertEquals(63, S2Support.storageBitCountForLevel(30));
}
@Test
public void validateCellId() {
// At the trailing 1.
assertThrows(IllegalArgumentException.class, () -> S2Support.validateCellId(0b00000000));
S2Support.validateCellId(0b00000001);
assertThrows(IllegalArgumentException.class, () -> S2Support.validateCellId(0b00000010));
S2Support.validateCellId(0b00000100);
assertThrows(IllegalArgumentException.class, () -> S2Support.validateCellId(0b00001000));
// Max valid face ID (101 = 5)
S2Support.validateCellId((0b10100000L << 56) | 0b00000001L);
assertThrows(IllegalArgumentException.class,
() -> S2Support.validateCellId((0b10100000L << 56) | 0b00000010));
S2Support.validateCellId((0b10100000L << 56) | 0b00000100L);
assertThrows(IllegalArgumentException.class,
() -> S2Support.validateCellId((0b10100000L << 56) | 0b00001000));
// Invalid face ID (111 == 6)
assertThrows(IllegalArgumentException.class,
() -> S2Support.validateCellId(0b11110000L << 56));
assertThrows(IllegalArgumentException.class,
() -> S2Support.validateCellId(0b11100100L << 56));
}
@Test
public void offsetCellId() {
// Check offset = 0.
assertEquals(0b00010000L << 56, S2Support.offsetCellId(0b00010000L << 56, 0));
assertEquals(0b00000100L << 56, S2Support.offsetCellId(0b00000100L << 56, 0));
assertThrows(IllegalArgumentException.class,
() -> S2Support.offsetCellId(0b00010000L << 56, 6));
assertThrows(IllegalArgumentException.class,
() -> S2Support.offsetCellId(0b10111100L << 56, 24));
// Try level 0 behavior.
assertEquals(0b00110000L << 56, S2Support.offsetCellId(0b00010000L << 56, 1));
// Wrap behavior: face ID 4 (100) incremented by 4 -> face 2
assertEquals(0b01010000L << 56, S2Support.offsetCellId(0b10010000L << 56, 4));
// Wrap behavior: face ID 4 (100) decremented by 5 -> face 5.
assertEquals(0b10110000L << 56, S2Support.offsetCellId(0b10010000L << 56, -5));
// Try level 1 behavior.
assertEquals(0b00110100L << 56, S2Support.offsetCellId(0b00101100L << 56, 1));
// Face advances...
assertEquals(0b01000100L << 56, S2Support.offsetCellId(0b00101100L << 56, 3));
// Face wraps positive...
assertEquals(0b00000100L << 56, S2Support.offsetCellId(0b10111100L << 56, 1));
// Face wraps positive (max positive offset)...
assertEquals(0b10110100L << 56, S2Support.offsetCellId(0b10111100L << 56, 23));
// Face wraps negative...
assertEquals(0b10111100L << 56, S2Support.offsetCellId(0b00000100L << 56, -1));
// Face wraps negative (max negative offset ...
assertEquals(0b00001100L << 56, S2Support.offsetCellId(0b00000100L << 56, -23));
}
@Test
public void getS2Level() {
assertEquals(30, S2Support.getS2Level(0b00000001L));
assertThrows(IllegalArgumentException.class, () -> S2Support.getS2Level(0b00000010L));
assertEquals(29, S2Support.getS2Level(0b00000100L));
assertEquals(1, S2Support.getS2Level(0b00000100L << 56));
assertThrows(IllegalArgumentException.class, () -> S2Support.getS2Level(0b00001000L << 56));
assertEquals(0, S2Support.getS2Level(0b00010000L << 56));
}
@Test
public void getMinCellId() {
assertEquals(S2Support.cellId(0, 0, 0), S2Support.getMinCellId(0));
assertEquals(S2Support.cellId(1, 0, 0), S2Support.getMinCellId(1));
assertEquals(S2Support.cellId(2, 0, 0), S2Support.getMinCellId(2));
assertEquals(S2Support.cellId(29, 0, 0), S2Support.getMinCellId(29));
assertEquals(S2Support.cellId(30, 0, 0), S2Support.getMinCellId(30));
}
@Test
public void getMaxCellId() {
assertEquals(S2Support.cellId(0, 5, 0), S2Support.getMaxCellId(0));
assertEquals(S2Support.cellId(1, 5, BitwiseUtils.maxUnsignedValue(2)),
S2Support.getMaxCellId(1));
assertEquals(S2Support.cellId(2, 5, BitwiseUtils.maxUnsignedValue(4)),
S2Support.getMaxCellId(2));
assertEquals(S2Support.cellId(29, 5, BitwiseUtils.maxUnsignedValue(29 * 2)),
S2Support.getMaxCellId(29));
assertEquals(S2Support.cellId(30, 5, BitwiseUtils.maxUnsignedValue(30 * 2)),
S2Support.getMaxCellId(30));
}
private void assertCellIdEquals(long expectedCellId, long actualCellId) {
assertEquals("expected=" + S2Support.cellIdToString(expectedCellId)
+ ", actual=" + S2Support.cellIdToString(actualCellId),
expectedCellId, actualCellId);
}
}
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