net.minecraft.server.NibbleArray Maven / Gradle / Ivy

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package net.minecraft.server;

public class NibbleArray {

  private final byte[] a;

  public NibbleArray() {
    this.a = new byte[2048];
  }

  public NibbleArray(byte[] abyte) {
    this.a = abyte;
    if (abyte.length != 2048) {
      throw new IllegalArgumentException("ChunkNibbleArrays should be 2048 bytes not: " + abyte.length);
    }
  }

  public int a(int i, int j, int k) {
    return this.a(this.b(i, j, k));
  }

  public void a(int i, int j, int k, int l) {
    this.a(this.b(i, j, k), l);
  }

  private int b(int i, int j, int k) {
    return j << 8 | k << 4 | i;
  }

  public int a(int i) {
    int j = this.c(i);

    return this.b(i) ? this.a[j] & 15 : this.a[j] >> 4 & 15;
  }

  public void a(int i, int j) {
    int k = this.c(i);

    if (this.b(i)) {
      this.a[k] = (byte) (this.a[k] & 240 | j & 15);
    } else {
      this.a[k] = (byte) (this.a[k] & 15 | (j & 15) << 4);
    }

  }

  private boolean b(int i) {
    return (i & 1) == 0;
  }

  private int c(int i) {
    return i >> 1;
  }

  public byte[] a() {
    return this.a;
  }
}