Code/net/minecraft/network/VarInt.java

package net.minecraft.network;

import io.netty.buffer.ByteBuf;

public class VarInt {
    private static final int MAX_VARINT_SIZE = 5;
    private static final int DATA_BITS_MASK = 127;
    private static final int CONTINUATION_BIT_MASK = 128;
    private static final int DATA_BITS_PER_BYTE = 7;

    public static int getByteSize(int p_298763_) {
        for (int i = 1; i < 5; i++) {
            if ((p_298763_ & -1 << i * 7) == 0) {
                return i;
            }
        }

        return 5;
    }

    public static boolean hasContinuationBit(byte p_299197_) {
        return (p_299197_ & 128) == 128;
    }

    public static int read(ByteBuf p_298603_) {
        int i = 0;
        int j = 0;

        byte b0;
        do {
            b0 = p_298603_.readByte();
            i |= (b0 & 127) << j++ * 7;
            if (j > 5) {
                throw new RuntimeException("VarInt too big");
            }
        } while (hasContinuationBit(b0));

        return i;
    }

    public static ByteBuf write(ByteBuf p_300403_, int p_297833_) {
        while ((p_297833_ & -128) != 0) {
            p_300403_.writeByte(p_297833_ & 127 | 128);
            p_297833_ >>>= 7;
        }

        p_300403_.writeByte(p_297833_);
        return p_300403_;
    }
}