mirror of https://github.com/cabaletta/baritone
96 lines
2.5 KiB
Java
96 lines
2.5 KiB
Java
/*
|
|
* This file is part of Baritone.
|
|
*
|
|
* Baritone is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Baritone is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with Baritone. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package baritone.utils.type;
|
|
|
|
import it.unimi.dsi.fastutil.bytes.ByteArrayList;
|
|
import it.unimi.dsi.fastutil.bytes.ByteList;
|
|
|
|
/**
|
|
* @author Brady
|
|
* @since 12/19/2019
|
|
*/
|
|
public final class VarInt {
|
|
|
|
private final int value;
|
|
private final byte[] serialized;
|
|
private final int size;
|
|
|
|
public VarInt(int value) {
|
|
this.value = value;
|
|
this.serialized = serialize0(this.value);
|
|
this.size = this.serialized.length;
|
|
}
|
|
|
|
/**
|
|
* @return The integer value that is represented by this {@link VarInt}.
|
|
*/
|
|
public final int getValue() {
|
|
return this.value;
|
|
}
|
|
|
|
/**
|
|
* @return The size of this {@link VarInt}, in bytes, once serialized.
|
|
*/
|
|
public final int getSize() {
|
|
return this.size;
|
|
}
|
|
|
|
public final byte[] serialize() {
|
|
return this.serialized;
|
|
}
|
|
|
|
private static byte[] serialize0(int valueIn) {
|
|
ByteList bytes = new ByteArrayList();
|
|
|
|
int value = valueIn;
|
|
while ((value & 0x80) != 0) {
|
|
bytes.add((byte) (value & 0x7F | 0x80));
|
|
value >>>= 7;
|
|
}
|
|
bytes.add((byte) (value & 0xFF));
|
|
|
|
return bytes.toByteArray();
|
|
}
|
|
|
|
public static VarInt read(byte[] bytes) {
|
|
return read(bytes, 0);
|
|
}
|
|
|
|
public static VarInt read(byte[] bytes, int start) {
|
|
int value = 0;
|
|
int size = 0;
|
|
int index = start;
|
|
|
|
while (true) {
|
|
byte b = bytes[index++];
|
|
value |= (b & 0x7F) << size++ * 7;
|
|
|
|
if (size > 5) {
|
|
throw new IllegalArgumentException("VarInt size cannot exceed 5 bytes");
|
|
}
|
|
|
|
// Most significant bit denotes another byte is to be read.
|
|
if ((b & 0x80) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return new VarInt(value);
|
|
}
|
|
}
|