93 lines
3.9 KiB
Java
93 lines
3.9 KiB
Java
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.bluecolored.bluemap.core.world.mca;
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import com.google.gson.reflect.TypeToken;
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import de.bluecolored.bluemap.core.util.Key;
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import de.bluecolored.bluemap.core.world.BlockState;
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import de.bluecolored.bluemap.core.world.block.entity.BlockEntity;
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import de.bluecolored.bluemap.core.world.mca.data.BlockStateDeserializer;
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import de.bluecolored.bluemap.core.world.mca.data.KeyDeserializer;
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import de.bluecolored.bluenbt.BlueNBT;
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public class MCAUtil {
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public static final BlueNBT BLUENBT = new BlueNBT();
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static {
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BLUENBT.register(TypeToken.get(BlockState.class), new BlockStateDeserializer());
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BLUENBT.register(TypeToken.get(Key.class), new KeyDeserializer());
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BLUENBT.register(TypeToken.get(BlockEntity.class), new BlockEntity.BlockEntityDeserializer());
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}
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/**
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* Having a long array where each long contains as many values as fit in it without overflowing, returning the "valueIndex"-th value when each value has "bitsPerValue" bits.
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*/
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public static long getValueFromLongArray(long[] data, int valueIndex, int bitsPerValue) {
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int valuesPerLong = 64 / bitsPerValue;
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int longIndex = valueIndex / valuesPerLong;
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int bitIndex = (valueIndex % valuesPerLong) * bitsPerValue;
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if (longIndex >= data.length) return 0;
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long value = data[longIndex] >>> bitIndex;
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return value & (0xFFFFFFFFFFFFFFFFL >>> -bitsPerValue);
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}
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/**
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* Treating the long array "data" as a continuous stream of bits, returning the "valueIndex"-th value when each value has "bitsPerValue" bits.
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*/
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@SuppressWarnings("ShiftOutOfRange")
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public static long getValueFromLongStream(long[] data, int valueIndex, int bitsPerValue) {
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int bitIndex = valueIndex * bitsPerValue;
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int firstLong = bitIndex >> 6; // index / 64
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int bitOffset = bitIndex & 0x3F; // Math.floorMod(index, 64)
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if (firstLong >= data.length) return 0;
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long value = data[firstLong] >>> bitOffset;
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if (bitOffset > 0 && firstLong + 1 < data.length) {
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long value2 = data[firstLong + 1];
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value2 = value2 << -bitOffset;
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value = value | value2;
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}
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return value & (0xFFFFFFFFFFFFFFFFL >>> -bitsPerValue);
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}
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/**
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* Extracts the 4 bits of the left (largeHalf = <code>true</code>) or the right (largeHalf = <code>false</code>) side of the byte stored in <code>value</code>.<br>
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* The value is treated as an unsigned byte.
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*/
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public static int getByteHalf(int value, boolean largeHalf) {
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if (largeHalf) return value >> 4 & 0xF;
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return value & 0xF;
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}
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public static int ceilLog2(int n) {
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return Integer.SIZE - Integer.numberOfLeadingZeros(n - 1);
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}
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}
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