From 5dff4bbe6a7cc485b95836bb70bc20a72fc302be Mon Sep 17 00:00:00 2001
From: DmitriyMX <dimon550@gmail.com>
Date: Thu, 18 Oct 2018 01:29:11 +0300
Subject: [PATCH] RegionFile -> Region

---
 .../anvil/{RegionFile.java => Region.java}    | 36 ++++++++++++++-----
 1 file changed, 27 insertions(+), 9 deletions(-)
 rename anvil-loader/src/main/java/mc/world/anvil/{RegionFile.java => Region.java} (75%)

diff --git a/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java b/anvil-loader/src/main/java/mc/world/anvil/Region.java
similarity index 75%
rename from anvil-loader/src/main/java/mc/world/anvil/RegionFile.java
rename to anvil-loader/src/main/java/mc/world/anvil/Region.java
index a2bd8c7..38c30f9 100644
--- a/anvil-loader/src/main/java/mc/world/anvil/RegionFile.java
+++ b/anvil-loader/src/main/java/mc/world/anvil/Region.java
@@ -1,5 +1,6 @@
 package mc.world.anvil;
 
+import com.flowpowered.nbt.CompoundTag;
 import com.flowpowered.nbt.Tag;
 import com.flowpowered.nbt.stream.NBTInputStream;
 import gnu.trove.list.TByteList;
@@ -9,30 +10,48 @@ import mc.core.world.chunk.Chunk;
 
 import javax.annotation.Nullable;
 import java.io.*;
-import java.util.ArrayList;
-import java.util.List;
 import java.util.zip.InflaterInputStream;
 
 @Slf4j
-public class RegionFile implements Closeable {
+class Region implements Closeable {
     private static final byte BYTE_TRUE = 1,
                               BYTE_FALSE = 0;
+    private static final byte[] EMPTY_SECTOR = new byte[4096];
 
     private RandomAccessFile file;
     private TByteList sectorFree;
     private final int[] offsets = new int[1024];
 
-    public RegionFile(File file) throws IOException {
+    private void correctingSizeRegionFile() throws IOException {
+        if (this.file.length() < 4096L) {
+            this.file.write(EMPTY_SECTOR);
+            this.file.write(EMPTY_SECTOR);
+        }
+
+        if ((this.file.length() & 4095L) != 0L) {
+            for (int i = 0; i < (this.file.length() & 4095L); i++) {
+                this.file.write(0);
+            }
+        }
+    }
+
+    Region(File file) throws IOException {
         this.file = new RandomAccessFile(file, "rw");
 
+        //TODO ???
+        correctingSizeRegionFile();
+
         int sizeOfSectorFree = (int)this.file.length() / 4096;
         sectorFree = new TByteArrayList(sizeOfSectorFree);
+
         sectorFree.add(BYTE_FALSE);
         sectorFree.add(BYTE_FALSE);
         for (int i = 0; i < sizeOfSectorFree-2; i++) {
             sectorFree.add(BYTE_TRUE);
         }
 
+        this.file.seek(0L);
+
         for (int i = 0; i < offsets.length; ++i) {
             int read = this.file.readInt();
             offsets[i] = read;
@@ -48,13 +67,13 @@ public class RegionFile implements Closeable {
     }
 
     @Nullable
-    public Chunk getChunk(int x, int z) {
+    Chunk getChunk(int x, int z) {
         int offset = getOffset(x, z);
 
         if (offset == 0) return null;
 
-        int v1 = offset >> 8;  // j
-        int v2 = offset & 255; // k
+        int v1 = offset >> 8;
+        int v2 = offset & 255;
 
         if (v1 + v2 > sectorFree.size()) return null;
 
@@ -77,9 +96,8 @@ public class RegionFile implements Closeable {
                 NBTInputStream nbtInputStream = new NBTInputStream(inputStream, false);
 
                 Tag rootTag = nbtInputStream.readTag();
-                log.info(rootTag.toString());
-
                 nbtInputStream.close();
+                return new AnvilChunk((CompoundTag) rootTag);
             }
         } catch (IOException e) {
             log.error("Get chunk", e);