001    package net.minecraft.network.packet;
002    
003    import cpw.mods.fml.relauncher.Side;
004    import cpw.mods.fml.relauncher.SideOnly;
005    import java.io.DataInputStream;
006    import java.io.DataOutputStream;
007    import java.io.IOException;
008    import java.util.List;
009    import java.util.concurrent.Semaphore;
010    import java.util.zip.DataFormatException;
011    import java.util.zip.Deflater;
012    import java.util.zip.Inflater;
013    import net.minecraft.world.chunk.Chunk;
014    
015    public class Packet56MapChunks extends Packet
016    {
017        private int[] field_73589_c;
018        private int[] field_73586_d;
019        public int[] field_73590_a;
020        public int[] field_73588_b;
021        private byte[] field_73587_e;
022        private byte[][] field_73584_f;
023        private int field_73585_g;
024        private boolean field_92024_h;
025        private static byte[] field_73591_h = new byte[0];
026        private int maxLen = 0;
027    
028        private Semaphore deflateGate;
029    
030        public Packet56MapChunks() {}
031    
032        public Packet56MapChunks(List par1List)
033        {
034            int var2 = par1List.size();
035            this.field_73589_c = new int[var2];
036            this.field_73586_d = new int[var2];
037            this.field_73590_a = new int[var2];
038            this.field_73588_b = new int[var2];
039            this.field_73584_f = new byte[var2][];
040            this.field_92024_h = !par1List.isEmpty() && !((Chunk)par1List.get(0)).worldObj.provider.hasNoSky;
041            int var3 = 0;
042    
043            for (int var4 = 0; var4 < var2; ++var4)
044            {
045                Chunk var5 = (Chunk)par1List.get(var4);
046                Packet51MapChunkData var6 = Packet51MapChunk.getMapChunkData(var5, true, 65535);
047                var3 += var6.field_74582_a.length;
048                this.field_73589_c[var4] = var5.xPosition;
049                this.field_73586_d[var4] = var5.zPosition;
050                this.field_73590_a[var4] = var6.field_74580_b;
051                this.field_73588_b[var4] = var6.field_74581_c;
052                this.field_73584_f[var4] = var6.field_74582_a;
053                deflateGate = new Semaphore(1);
054            }
055    
056            maxLen = var3;
057        }
058    
059        private void deflate()
060        {
061            byte[] data = new byte[maxLen];
062            int offset = 0;
063            for (int x = 0; x < field_73584_f.length; x++)
064            {
065                System.arraycopy(field_73584_f[x], 0, data, offset, field_73584_f[x].length);
066                offset += field_73584_f[x].length;
067            }
068    
069            Deflater var11 = new Deflater(-1);
070    
071            try
072            {
073                var11.setInput(data, 0, maxLen);
074                var11.finish();
075                this.field_73587_e = new byte[maxLen];
076                this.field_73585_g = var11.deflate(this.field_73587_e);
077            }
078            finally
079            {
080                var11.end();
081            }
082        }
083    
084        /**
085         * Abstract. Reads the raw packet data from the data stream.
086         */
087        public void readPacketData(DataInputStream par1DataInputStream) throws IOException
088        {
089            short var2 = par1DataInputStream.readShort();
090            this.field_73585_g = par1DataInputStream.readInt();
091            this.field_92024_h = par1DataInputStream.readBoolean();
092            this.field_73589_c = new int[var2];
093            this.field_73586_d = new int[var2];
094            this.field_73590_a = new int[var2];
095            this.field_73588_b = new int[var2];
096            this.field_73584_f = new byte[var2][];
097    
098            if (field_73591_h.length < this.field_73585_g)
099            {
100                field_73591_h = new byte[this.field_73585_g];
101            }
102    
103            par1DataInputStream.readFully(field_73591_h, 0, this.field_73585_g);
104            byte[] var3 = new byte[196864 * var2];
105            Inflater var4 = new Inflater();
106            var4.setInput(field_73591_h, 0, this.field_73585_g);
107    
108            try
109            {
110                var4.inflate(var3);
111            }
112            catch (DataFormatException var12)
113            {
114                throw new IOException("Bad compressed data format");
115            }
116            finally
117            {
118                var4.end();
119            }
120    
121            int var5 = 0;
122    
123            for (int var6 = 0; var6 < var2; ++var6)
124            {
125                this.field_73589_c[var6] = par1DataInputStream.readInt();
126                this.field_73586_d[var6] = par1DataInputStream.readInt();
127                this.field_73590_a[var6] = par1DataInputStream.readShort();
128                this.field_73588_b[var6] = par1DataInputStream.readShort();
129                int var7 = 0;
130                int var8 = 0;
131                int var9;
132    
133                for (var9 = 0; var9 < 16; ++var9)
134                {
135                    var7 += this.field_73590_a[var6] >> var9 & 1;
136                    var8 += this.field_73588_b[var6] >> var9 & 1;
137                }
138    
139                var9 = 2048 * 4 * var7 + 256;
140                var9 += 2048 * var8;
141    
142                if (this.field_92024_h)
143                {
144                    var9 += 2048 * var7;
145                }
146    
147                this.field_73584_f[var6] = new byte[var9];
148                System.arraycopy(var3, var5, this.field_73584_f[var6], 0, var9);
149                var5 += var9;
150            }
151        }
152    
153        /**
154         * Abstract. Writes the raw packet data to the data stream.
155         */
156        public void writePacketData(DataOutputStream par1DataOutputStream) throws IOException
157        {
158            if (field_73587_e == null)
159            {
160                deflateGate.acquireUninterruptibly();
161                if (field_73587_e == null)
162                {
163                    deflate();
164                }
165                deflateGate.release();
166            }
167    
168            par1DataOutputStream.writeShort(this.field_73589_c.length);
169            par1DataOutputStream.writeInt(this.field_73585_g);
170            par1DataOutputStream.writeBoolean(this.field_92024_h);
171            par1DataOutputStream.write(this.field_73587_e, 0, this.field_73585_g);
172    
173            for (int var2 = 0; var2 < this.field_73589_c.length; ++var2)
174            {
175                par1DataOutputStream.writeInt(this.field_73589_c[var2]);
176                par1DataOutputStream.writeInt(this.field_73586_d[var2]);
177                par1DataOutputStream.writeShort((short)(this.field_73590_a[var2] & 65535));
178                par1DataOutputStream.writeShort((short)(this.field_73588_b[var2] & 65535));
179            }
180        }
181    
182        /**
183         * Passes this Packet on to the NetHandler for processing.
184         */
185        public void processPacket(NetHandler par1NetHandler)
186        {
187            par1NetHandler.handleMapChunks(this);
188        }
189    
190        /**
191         * Abstract. Return the size of the packet (not counting the header).
192         */
193        public int getPacketSize()
194        {
195            return 6 + this.field_73585_g + 12 * this.func_73581_d();
196        }
197    
198        @SideOnly(Side.CLIENT)
199        public int func_73582_a(int par1)
200        {
201            return this.field_73589_c[par1];
202        }
203    
204        @SideOnly(Side.CLIENT)
205        public int func_73580_b(int par1)
206        {
207            return this.field_73586_d[par1];
208        }
209    
210        public int func_73581_d()
211        {
212            return this.field_73589_c.length;
213        }
214    
215        @SideOnly(Side.CLIENT)
216        public byte[] func_73583_c(int par1)
217        {
218            return this.field_73584_f[par1];
219        }
220    }