Paper/src/main/java/net/minecraft/server/ChunkSection.java

package net.minecraft.server;

public class ChunkSection {

    private int a;
    private int b;
    private int c;
    private byte[] d;
    private NibbleArray e;
    private NibbleArray f;
    private NibbleArray g;
    private NibbleArray h;

    public ChunkSection(int i) {
        this.a = i;
        this.d = new byte[4096];
        this.f = new NibbleArray(this.d.length, 4);
        this.h = new NibbleArray(this.d.length, 4);
        this.g = new NibbleArray(this.d.length, 4);
    }

    // CraftBukkit start
    public ChunkSection(int y, byte[] blkData, byte[] extBlkData) {
        this.a = y;
        this.d = blkData;
        if (extBlkData != null) {
            this.e = new NibbleArray(extBlkData, 4);
        }
        this.f = new NibbleArray(this.d.length, 4);
        this.h = new NibbleArray(this.d.length, 4);
        this.g = new NibbleArray(this.d.length, 4);
        this.d();
    }
    // CraftBukkit end

    public int a(int i, int j, int k) {
        int l = this.d[j << 8 | k << 4 | i] & 255;

        return this.e != null ? this.e.a(i, j, k) << 8 | l : l;
    }

    public void a(int i, int j, int k, int l) {
        int i1 = this.d[j << 8 | k << 4 | i] & 255;

        if (this.e != null) {
            i1 |= this.e.a(i, j, k) << 8;
        }

        if (i1 == 0 && l != 0) {
            ++this.b;
            if (Block.byId[l] != null && Block.byId[l].m()) {
                ++this.c;
            }
        } else if (i1 != 0 && l == 0) {
            --this.b;
            if (Block.byId[i1] != null && Block.byId[i1].m()) {
                --this.c;
            }
        } else if (Block.byId[i1] != null && Block.byId[i1].m() && (Block.byId[l] == null || !Block.byId[l].m())) {
            --this.c;
        } else if ((Block.byId[i1] == null || !Block.byId[i1].m()) && Block.byId[l] != null && Block.byId[l].m()) {
            ++this.c;
        }

        this.d[j << 8 | k << 4 | i] = (byte) (l & 255);
        if (l > 255) {
            if (this.e == null) {
                this.e = new NibbleArray(this.d.length, 4);
            }

            this.e.a(i, j, k, (l & 3840) >> 8);
        } else if (this.e != null) {
            this.e.a(i, j, k, 0);
        }
    }

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

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

    public boolean a() {
        return this.b == 0;
    }

    public boolean b() {
        return this.c > 0;
    }

    public int c() {
        return this.a;
    }

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

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

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

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

    public void d() {
        this.b = 0;
        this.c = 0;

        for (int i = 0; i < 16; ++i) {
            for (int j = 0; j < 16; ++j) {
                for (int k = 0; k < 16; ++k) {
                    int l = this.a(i, j, k);

                    if (l > 0) {
                        if (Block.byId[l] == null) {
                            this.d[j << 8 | k << 4 | i] = 0;
                            if (this.e != null) {
                                this.e.a(i, j, k, 0);
                            }
                        } else {
                            ++this.b;
                            if (Block.byId[l].m()) {
                                ++this.c;
                            }
                        }
                    }
                }
            }
        }
    }

    public void e() {}

    public int f() {
        return this.b;
    }

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

    public NibbleArray h() {
        return this.e;
    }

    public NibbleArray i() {
        return this.f;
    }

    public NibbleArray j() {
        return this.g;
    }

    public NibbleArray k() {
        return this.h;
    }

    public void a(byte[] abyte) {
        this.d = abyte;
    }

    public void a(NibbleArray nibblearray) {
        this.e = nibblearray;
    }

    public void b(NibbleArray nibblearray) {
        this.f = nibblearray;
    }

    public void c(NibbleArray nibblearray) {
        this.g = nibblearray;
    }

    public void d(NibbleArray nibblearray) {
        this.h = nibblearray;
    }
}