diff --git a/src/main/java/com/reandroid/apk/xmlencoder/FilePathEncoder.java b/src/main/java/com/reandroid/apk/xmlencoder/FilePathEncoder.java
index 8de5199..41cb2a5 100644
--- a/src/main/java/com/reandroid/apk/xmlencoder/FilePathEncoder.java
+++ b/src/main/java/com/reandroid/apk/xmlencoder/FilePathEncoder.java
@@ -64,10 +64,10 @@ package com.reandroid.apk.xmlencoder;
     public InputSource encodeFileEntry(File resFile){
         String type = EncodeUtil.getTypeNameFromResFile(resFile);
         PackageBlock packageBlock = materials.getCurrentPackage();
-        byte typeId=packageBlock
+        int typeId=packageBlock
                 .getTypeStringPool().idOf(type);
         String qualifiers = EncodeUtil.getQualifiersFromResFile(resFile);
-        TypeBlock typeBlock = packageBlock.getOrCreateTypeBlock(typeId, qualifiers);
+        TypeBlock typeBlock = packageBlock.getOrCreateTypeBlock((byte)typeId, qualifiers);
         String name = EncodeUtil.getEntryNameFromResFile(resFile);
         int resourceId=materials.resolveLocalResourceId(type, name);
 
diff --git a/src/main/java/com/reandroid/apk/xmlencoder/XMLValuesEncoder.java b/src/main/java/com/reandroid/apk/xmlencoder/XMLValuesEncoder.java
index a077fce..9a051ef 100644
--- a/src/main/java/com/reandroid/apk/xmlencoder/XMLValuesEncoder.java
+++ b/src/main/java/com/reandroid/apk/xmlencoder/XMLValuesEncoder.java
@@ -92,7 +92,7 @@ class XMLValuesEncoder {
     private TypeBlock getTypeBlock(String type, String qualifiers){
         PackageBlock packageBlock = getMaterials().getCurrentPackage();
         TypeStringPool typeStringPool = packageBlock.getTypeStringPool();
-        byte typeId = typeStringPool.idOf(type);
+        byte typeId = (byte) typeStringPool.idOf(type);
         SpecTypePair specTypePair
                 = packageBlock.getSpecTypePairArray().getOrCreate(typeId);
         int highest = specTypePair.getHighestEntryCount();
diff --git a/src/main/java/com/reandroid/arsc/array/EntryBlockArray.java b/src/main/java/com/reandroid/arsc/array/EntryBlockArray.java
index 3e368ac..602854a 100755
--- a/src/main/java/com/reandroid/arsc/array/EntryBlockArray.java
+++ b/src/main/java/com/reandroid/arsc/array/EntryBlockArray.java
@@ -122,25 +122,9 @@ public class EntryBlockArray extends OffsetBlockArray<EntryBlock> implements JSO
         while (itr.hasNext()){
             EntryBlock comingBlock=itr.next();
             EntryBlock existingBlock=get(comingBlock.getIndex());
-            if(shouldMerge(existingBlock, comingBlock)){
-                existingBlock.merge(comingBlock);
-            }
+            existingBlock.merge(comingBlock);
         }
     }
-    private boolean shouldMerge(EntryBlock exist, EntryBlock coming){
-        if(exist.isNull()){
-            return true;
-        }
-        if(coming.isNull()){
-            return false;
-        }
-        BaseResValue resVal = coming.getResValue();
-        if(resVal instanceof ResValueInt){
-            ValueType valueType=((ResValueInt)resVal).getValueType();
-            return valueType!=ValueType.INT_BOOLEAN;
-        }
-        return true;
-    }
     @Override
     public String toString(){
         return getClass().getSimpleName()+": size="+childesCount();
diff --git a/src/main/java/com/reandroid/arsc/array/OffsetBlockArray.java b/src/main/java/com/reandroid/arsc/array/OffsetBlockArray.java
index 2e4324c..04e6139 100755
--- a/src/main/java/com/reandroid/arsc/array/OffsetBlockArray.java
+++ b/src/main/java/com/reandroid/arsc/array/OffsetBlockArray.java
@@ -102,10 +102,6 @@ public abstract class OffsetBlockArray<T extends Block> extends BlockArray<T> im
                 if(item==null || item.isNull()){
                     offset=-1;
                 }else {
-                    // slow but accurate
-                    //offset=countUpTo(item);
-
-                    // fast but fails for duplicate items
                     offset=sum;
                     sum+=item.countBytes();
                 }
diff --git a/src/main/java/com/reandroid/arsc/array/SpecTypePairArray.java b/src/main/java/com/reandroid/arsc/array/SpecTypePairArray.java
index c27693d..0d47457 100755
--- a/src/main/java/com/reandroid/arsc/array/SpecTypePairArray.java
+++ b/src/main/java/com/reandroid/arsc/array/SpecTypePairArray.java
@@ -182,7 +182,7 @@ public class SpecTypePairArray extends BlockArray<SpecTypePair>
             if(pair==null){
                 continue;
             }
-            int id=pair.getTypeIdInt();
+            int id=pair.getId();
             if(!firstFound){
                 result=id;
             }
@@ -204,7 +204,7 @@ public class SpecTypePairArray extends BlockArray<SpecTypePair>
             if(pair==null){
                 continue;
             }
-            int id=pair.getTypeIdInt();
+            int id=pair.getId();
             if(id>result){
                 result=id;
             }
diff --git a/src/main/java/com/reandroid/arsc/array/TypeBlockArray.java b/src/main/java/com/reandroid/arsc/array/TypeBlockArray.java
index cc67a12..bbbcd62 100755
--- a/src/main/java/com/reandroid/arsc/array/TypeBlockArray.java
+++ b/src/main/java/com/reandroid/arsc/array/TypeBlockArray.java
@@ -20,6 +20,7 @@ import com.reandroid.arsc.base.Block;
 import com.reandroid.arsc.base.BlockArray;
 import com.reandroid.arsc.chunk.SpecBlock;
 import com.reandroid.arsc.chunk.TypeBlock;
+import com.reandroid.arsc.container.SpecTypePair;
 import com.reandroid.arsc.header.HeaderBlock;
 import com.reandroid.arsc.io.BlockReader;
 import com.reandroid.arsc.item.TypeString;
@@ -142,16 +143,12 @@ public class TypeBlockArray extends BlockArray<TypeBlock>
         }
     }
     public byte getTypeId(){
-        if(mTypeId != 0){
-            return mTypeId;
-        }
         SpecBlock specBlock=getSpecBlock();
         if(specBlock!=null){
-            byte id=specBlock.getTypeId();
-            if(id!=0){
-                mTypeId=id;
-                return id;
-            }
+            return specBlock.getTypeId();
+        }
+        if(mTypeId != 0){
+            return mTypeId;
         }
         TypeBlock[] allChildes=getChildes();
         if(allChildes==null){
@@ -192,8 +189,8 @@ public class TypeBlockArray extends BlockArray<TypeBlock>
     private SpecBlock getSpecBlock(){
         Block parent=getParent();
         while(parent!=null){
-            if(parent instanceof SpecBlock){
-                return (SpecBlock)parent;
+            if(parent instanceof SpecTypePair){
+                return ((SpecTypePair) parent).getSpecBlock();
             }
             parent=parent.getParent();
         }
diff --git a/src/main/java/com/reandroid/arsc/chunk/MainChunk.java b/src/main/java/com/reandroid/arsc/chunk/MainChunk.java
new file mode 100644
index 0000000..d9700c2
--- /dev/null
+++ b/src/main/java/com/reandroid/arsc/chunk/MainChunk.java
@@ -0,0 +1,7 @@
+package com.reandroid.arsc.chunk;
+
+import com.reandroid.arsc.pool.StringPool;
+
+public interface MainChunk {
+    public StringPool<?> getStringPool();
+}
diff --git a/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java b/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
index fff95ac..d871e6e 100755
--- a/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
+++ b/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
@@ -30,6 +30,7 @@ package com.reandroid.arsc.chunk;
  import com.reandroid.arsc.pool.TypeStringPool;
  import com.reandroid.arsc.value.EntryBlock;
  import com.reandroid.arsc.value.LibraryInfo;
+ import com.reandroid.arsc.value.ResConfig;
  import com.reandroid.arsc.value.StagedAliasEntry;
  import com.reandroid.json.JSONConvert;
  import com.reandroid.json.JSONObject;
@@ -51,7 +52,7 @@ package com.reandroid.arsc.chunk;
         super(new PackageHeader(), 3);
         PackageHeader header = getHeaderBlock();
 
-        this.mTypeStringPool=new TypeStringPool(false, header.getTypeIdOffset());
+        this.mTypeStringPool=new TypeStringPool(false, header.getTypeIdOffsetItem());
         this.mSpecStringPool=new SpecStringPool(true);
 
         this.mBody = new PackageBody();
@@ -62,6 +63,34 @@ package com.reandroid.arsc.chunk;
         addChild(mSpecStringPool);
         addChild(mBody);
     }
+    public EntryBlock getOrCreate(String qualifiers, String type, String name){
+        ResConfig resConfig = new ResConfig();
+        resConfig.parseQualifiers(qualifiers);
+        return getOrCreate(resConfig, type, name);
+    }
+    public EntryBlock getOrCreate(ResConfig resConfig, String type, String name){
+        SpecTypePair specTypePair = getOrCreateSpecType(type);
+        TypeBlock typeBlock = specTypePair.getOrCreateTypeBlock(resConfig);
+        return typeBlock.getOrCreateEntry(name);
+    }
+    public SpecTypePair getOrCreateSpecType(String type){
+        int last = 0;
+        for(SpecTypePair specTypePair:listAllSpecTypePair()){
+            if(type.equals(specTypePair.getTypeName())){
+                return specTypePair;
+            }
+            int id = specTypePair.getId();
+            if(id>last){
+                last=id;
+            }
+        }
+        last++;
+        getTypeStringPool().getOrCreate(last, type);
+        return getSpecTypePairArray().getOrCreate((byte) last);
+    }
+    public int getTypeIdOffset(){
+        return getHeaderBlock().getTypeIdOffset();
+    }
     public BlockList<UnknownChunk> getUnknownChunkList(){
          return mBody.getUnknownChunkList();
     }
@@ -270,7 +299,7 @@ package com.reandroid.arsc.chunk;
         //int largest=getSpecTypePairArray().getHighestTypeId();
         //int count=getTypeStringPool().countStrings();
         //getHeaderBlock().getTypeIdOffset().set(count-largest);
-        getHeaderBlock().getTypeIdOffset().set(0);
+        getHeaderBlock().getTypeIdOffsetItem().set(0);
     }
     public void onEntryAdded(EntryBlock entryBlock){
         updateEntry(entryBlock);
diff --git a/src/main/java/com/reandroid/arsc/chunk/SpecBlock.java b/src/main/java/com/reandroid/arsc/chunk/SpecBlock.java
index d11ecff..6aba598 100755
--- a/src/main/java/com/reandroid/arsc/chunk/SpecBlock.java
+++ b/src/main/java/com/reandroid/arsc/chunk/SpecBlock.java
@@ -42,14 +42,15 @@
      public byte getTypeId(){
          return getHeaderBlock().getId().get();
      }
-     public int getTypeIdInt(){
+     public int getId(){
          return getHeaderBlock().getId().unsignedInt();
      }
-     public void setTypeId(int id){
+     public void setId(int id){
          setTypeId((byte) (0xff & id));
      }
      public void setTypeId(byte id){
          getHeaderBlock().getId().set(id);
+         getTypeBlockArray().setTypeId(id);
      }
      public TypeBlockArray getTypeBlockArray(){
          SpecTypePair specTypePair=getSpecTypePair();
@@ -94,12 +95,12 @@
      @Override
      public JSONObject toJson() {
          JSONObject jsonObject=new JSONObject();
-         jsonObject.put(TypeBlock.NAME_id, getTypeIdInt());
+         jsonObject.put(TypeBlock.NAME_id, getId());
          return jsonObject;
      }
 
      @Override
      public void fromJson(JSONObject json) {
-         setTypeId(json.getInt(TypeBlock.NAME_id));
+         setId(json.getInt(TypeBlock.NAME_id));
      }
  }
diff --git a/src/main/java/com/reandroid/arsc/chunk/TableBlock.java b/src/main/java/com/reandroid/arsc/chunk/TableBlock.java
index a7f807b..cc69ce3 100755
--- a/src/main/java/com/reandroid/arsc/chunk/TableBlock.java
+++ b/src/main/java/com/reandroid/arsc/chunk/TableBlock.java
@@ -22,6 +22,7 @@ import com.reandroid.arsc.header.HeaderBlock;
 import com.reandroid.arsc.header.InfoHeader;
 import com.reandroid.arsc.header.TableHeader;
 import com.reandroid.arsc.io.BlockReader;
+import com.reandroid.arsc.pool.StringPool;
 import com.reandroid.arsc.pool.TableStringPool;
 import com.reandroid.arsc.value.StagedAliasEntry;
 import com.reandroid.common.Frameworks;
@@ -34,7 +35,8 @@ import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
 
-public class TableBlock extends Chunk<TableHeader> implements JSONConvert<JSONObject> {
+public class TableBlock extends Chunk<TableHeader>
+        implements MainChunk, JSONConvert<JSONObject> {
     private final TableStringPool mTableStringPool;
     private final PackageArray mPackageArray;
     private final Set<TableBlock> mFrameWorks=new HashSet<>();
@@ -55,6 +57,10 @@ public class TableBlock extends Chunk<TableHeader> implements JSONConvert<JSONOb
     public Collection<PackageBlock> listPackages(){
         return getPackageArray().listItems();
     }
+    @Override
+    public TableStringPool getStringPool() {
+        return mTableStringPool;
+    }
     public TableStringPool getTableStringPool(){
         return mTableStringPool;
     }
diff --git a/src/main/java/com/reandroid/arsc/chunk/TypeBlock.java b/src/main/java/com/reandroid/arsc/chunk/TypeBlock.java
index 97015ee..efac077 100755
--- a/src/main/java/com/reandroid/arsc/chunk/TypeBlock.java
+++ b/src/main/java/com/reandroid/arsc/chunk/TypeBlock.java
@@ -25,6 +25,7 @@ import com.reandroid.arsc.item.*;
 import com.reandroid.arsc.pool.TypeStringPool;
 import com.reandroid.arsc.value.EntryBlock;
 import com.reandroid.arsc.value.ResConfig;
+import com.reandroid.arsc.value.ValueType;
 import com.reandroid.json.JSONConvert;
 import com.reandroid.json.JSONObject;
 
@@ -81,16 +82,16 @@ public class TypeBlock extends Chunk<TypeHeader>
             return null;
         }
         TypeStringPool typeStringPool=packageBlock.getTypeStringPool();
-        mTypeString=typeStringPool.getById(getTypeIdInt());
+        mTypeString=typeStringPool.getById(getId());
         return mTypeString;
     }
     public byte getTypeId(){
         return getHeaderBlock().getId().get();
     }
-    public int getTypeIdInt(){
+    public int getId(){
         return getHeaderBlock().getId().unsignedInt();
     }
-    public void setTypeId(int id){
+    public void setId(int id){
         setTypeId((byte) (0xff & id));
     }
     public void setTypeId(byte id){
@@ -98,7 +99,7 @@ public class TypeBlock extends Chunk<TypeHeader>
     }
     public void setTypeName(String name){
         TypeStringPool typeStringPool=getTypeStringPool();
-        int id=getTypeIdInt();
+        int id= getId();
         TypeString typeString=typeStringPool.getById(id);
         if(typeString==null){
             typeString=typeStringPool.getOrCreate(id, name);
@@ -162,6 +163,29 @@ public class TypeBlock extends Chunk<TypeHeader>
         }
         entryBlock.setNull(true);
     }
+    public EntryBlock getOrCreateEntry(String name){
+        for(EntryBlock entryBlock:getEntryBlockArray().listItems()){
+            if(name.equals(entryBlock.getName())){
+                return entryBlock;
+            }
+        }
+        SpecTypePair specTypePair = getParentSpecTypePair();
+        EntryBlock exist=specTypePair.getAnyEntry(name);
+        int id;
+        if(exist!=null){
+            id=exist.getIndex();
+        }else {
+            id = specTypePair.getHighestEntryCount();
+        }
+        SpecString specString = getPackageBlock()
+                .getSpecStringPool().getOrCreate(name);
+        EntryBlock entryBlock = getOrCreateEntry((short) id);
+        if(entryBlock.isNull()){
+            entryBlock.setValueAsRaw(ValueType.NULL, 0);
+        }
+        entryBlock.setSpecReference(specString.getIndex());
+        return entryBlock;
+    }
     public EntryBlock getOrCreateEntry(short entryId){
         return getEntryBlockArray().getOrCreate(entryId);
     }
@@ -219,7 +243,7 @@ public class TypeBlock extends Chunk<TypeHeader>
     @Override
     public JSONObject toJson() {
         JSONObject jsonObject=new JSONObject();
-        jsonObject.put(NAME_id, getTypeIdInt());
+        jsonObject.put(NAME_id, getId());
         jsonObject.put(NAME_name, getTypeName());
         jsonObject.put(NAME_config, getResConfig().toJson());
         jsonObject.put(NAME_entries, getEntryBlockArray().toJson());
@@ -227,7 +251,7 @@ public class TypeBlock extends Chunk<TypeHeader>
     }
     @Override
     public void fromJson(JSONObject json) {
-        setTypeId(json.getInt(NAME_id));
+        setId(json.getInt(NAME_id));
         String name = json.optString(NAME_name);
         if(name!=null){
             setTypeName(name);
@@ -250,8 +274,8 @@ public class TypeBlock extends Chunk<TypeHeader>
     }
     @Override
     public int compareTo(TypeBlock typeBlock) {
-        int id1=getTypeIdInt();
-        int id2=typeBlock.getTypeIdInt();
+        int id1= getId();
+        int id2=typeBlock.getId();
         if(id1!=id2){
             return Integer.compare(id1, id2);
         }
diff --git a/src/main/java/com/reandroid/arsc/chunk/xml/ResXmlDocument.java b/src/main/java/com/reandroid/arsc/chunk/xml/ResXmlDocument.java
index 7ab709d..cd703c3 100755
--- a/src/main/java/com/reandroid/arsc/chunk/xml/ResXmlDocument.java
+++ b/src/main/java/com/reandroid/arsc/chunk/xml/ResXmlDocument.java
@@ -17,6 +17,7 @@
 
  import com.reandroid.arsc.chunk.Chunk;
  import com.reandroid.arsc.chunk.ChunkType;
+ import com.reandroid.arsc.chunk.MainChunk;
  import com.reandroid.arsc.container.SingleBlockContainer;
  import com.reandroid.arsc.header.HeaderBlock;
  import com.reandroid.arsc.io.BlockReader;
@@ -36,7 +37,8 @@
  import java.util.List;
  import java.util.Set;
 
- public class ResXmlDocument extends Chunk<HeaderBlock> implements JSONConvert<JSONObject> {
+ public class ResXmlDocument extends Chunk<HeaderBlock>
+         implements MainChunk, JSONConvert<JSONObject> {
      private final ResXmlStringPool mResXmlStringPool;
      private final ResXmlIDMap mResXmlIDMap;
      private ResXmlElement mResXmlElement;
@@ -160,6 +162,7 @@
          }
          return false;
      }
+     @Override
      public ResXmlStringPool getStringPool(){
          return mResXmlStringPool;
      }
diff --git a/src/main/java/com/reandroid/arsc/container/SpecTypePair.java b/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
index 54a9a55..16efda5 100755
--- a/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
+++ b/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
@@ -53,6 +53,15 @@ public class SpecTypePair extends BlockContainer<Block>
     public SpecTypePair(){
         this(new SpecBlock(), new TypeBlockArray());
     }
+    public EntryBlock getAnyEntry(String name){
+        for(TypeBlock typeBlock:listTypeBlocks()){
+            EntryBlock entryBlock=typeBlock.searchByEntryName(name);
+            if(entryBlock!=null){
+                return entryBlock;
+            }
+        }
+        return null;
+    }
     public void sortTypes(){
         getTypeBlockArray().sort();
     }
@@ -74,6 +83,9 @@ public class SpecTypePair extends BlockContainer<Block>
     public TypeBlock getOrCreateTypeBlock(String qualifiers){
         return getTypeBlockArray().getOrCreate(qualifiers);
     }
+    public TypeBlock getOrCreateTypeBlock(ResConfig resConfig){
+        return getTypeBlockArray().getOrCreate(resConfig);
+    }
     public TypeBlock getTypeBlock(String qualifiers){
         return getTypeBlockArray().getTypeBlock(qualifiers);
     }
@@ -84,8 +96,8 @@ public class SpecTypePair extends BlockContainer<Block>
     public byte getTypeId(){
         return mSpecBlock.getTypeId();
     }
-    public int getTypeIdInt(){
-        return mSpecBlock.getTypeIdInt();
+    public int getId(){
+        return mSpecBlock.getId();
     }
     public void setTypeId(byte id){
         mSpecBlock.setTypeId(id);
@@ -177,13 +189,17 @@ public class SpecTypePair extends BlockContainer<Block>
         return typeEntryCount;
     }
     public TypeString getTypeString(){
-        return getTypeBlockArray().getTypeString();
+        PackageBlock packageBlock = getPackageBlock();
+        if(packageBlock!=null){
+            return packageBlock.getTypeStringPool().getById(getId());
+        }
+        return null;
     }
 
     @Override
     public JSONObject toJson() {
         JSONObject jsonObject=new JSONObject();
-        jsonObject.put("id", getSpecBlock().getTypeIdInt());
+        jsonObject.put("id", getSpecBlock().getId());
         jsonObject.put("types", getTypeBlockArray().toJson());
         return jsonObject;
     }
@@ -204,7 +220,7 @@ public class SpecTypePair extends BlockContainer<Block>
     }
     @Override
     public int compareTo(SpecTypePair specTypePair) {
-        return Integer.compare(getTypeIdInt(), specTypePair.getTypeIdInt());
+        return Integer.compare(getId(), specTypePair.getId());
     }
     @Override
     public String toString(){
diff --git a/src/main/java/com/reandroid/arsc/header/PackageHeader.java b/src/main/java/com/reandroid/arsc/header/PackageHeader.java
index b1f29bd..8094e66 100644
--- a/src/main/java/com/reandroid/arsc/header/PackageHeader.java
+++ b/src/main/java/com/reandroid/arsc/header/PackageHeader.java
@@ -72,9 +72,19 @@ public class PackageHeader extends HeaderBlock{
     public IntegerItem getSpecStringPoolCount() {
         return specStringPoolCount;
     }
-    public IntegerItem getTypeIdOffset() {
+    public IntegerItem getTypeIdOffsetItem() {
         return typeIdOffset;
     }
+    public void setTypeIdOffset(int offset){
+        typeIdOffset.set(offset);
+        typeIdOffsetContainer.setItem(typeIdOffset);
+    }
+    public int getTypeIdOffset() {
+        if(typeIdOffset.getParent()==null){
+            typeIdOffset.set(0);
+        }
+        return typeIdOffset.get();
+    }
     @Override
     void onHeaderSizeLoaded(int size){
         super.onHeaderSizeLoaded(size);
diff --git a/src/main/java/com/reandroid/arsc/io/BlockReader.java b/src/main/java/com/reandroid/arsc/io/BlockReader.java
index bce41a6..a80ed6d 100755
--- a/src/main/java/com/reandroid/arsc/io/BlockReader.java
+++ b/src/main/java/com/reandroid/arsc/io/BlockReader.java
@@ -47,6 +47,16 @@ import java.io.*;
     public BlockReader(File file) throws IOException {
         this(loadBuffer(file));
     }
+    public int readUnsignedShort() throws IOException {
+        return 0x0000ffff & readShort();
+    }
+    public short readShort() throws IOException {
+        int pos = getPosition();
+        byte[] bts = new byte[2];
+        readFully(bts);
+        seek(pos);
+        return toShort(bts, 0);
+    }
     public InfoHeader readHeaderBlock() throws IOException {
         InfoHeader infoHeader = new InfoHeader();
         if(available() < infoHeader.countBytes()){
@@ -80,6 +90,10 @@ import java.io.*;
                 (bts[offset+2] & 0xff) << 16 |
                 (bts[offset+3] & 0xff) << 24;
     }
+    private short toShort(byte[] bts, int offset){
+         return (short) (bts[offset] & 0xff |
+                          (bts[offset+1] & 0xff) << 8);
+    }
     public byte[] getBytes(){
         int len = length();
         if(this.BUFFER.length == len){
diff --git a/src/main/java/com/reandroid/arsc/item/BlockItem.java b/src/main/java/com/reandroid/arsc/item/BlockItem.java
index 33e1fb0..ad3392c 100755
--- a/src/main/java/com/reandroid/arsc/item/BlockItem.java
+++ b/src/main/java/com/reandroid/arsc/item/BlockItem.java
@@ -48,7 +48,7 @@ public abstract class BlockItem extends Block {
     final void setBytesLength(int length){
         setBytesLength(length, true);
     }
-    final void setBytesLength(int length, boolean notify){
+    protected final void setBytesLength(int length, boolean notify){
         if(length<0){
             length=0;
         }
@@ -122,4 +122,30 @@ public abstract class BlockItem extends Block {
         super.notifyBlockLoad();
         return bts.length;
     }
+
+    protected static int getInteger(byte[] bts, int offset){
+        if((offset+4)>bts.length){
+            return 0;
+        }
+        return bts[offset] & 0xff |
+                (bts[offset+1] & 0xff) << 8 |
+                (bts[offset+2] & 0xff) << 16 |
+                (bts[offset+3] & 0xff) << 24;
+    }
+    protected static short getShort(byte[] bts, int offset){
+        return (short) (bts[offset] & 0xff | (bts[offset+1] & 0xff) << 8);
+    }
+    protected static void putInteger(byte[] bts, int offset, int val){
+        if((offset+4)>bts.length){
+            return;
+        }
+        bts[offset+3]= (byte) (val >>> 24 & 0xff);
+        bts[offset+2]= (byte) (val >>> 16 & 0xff);
+        bts[offset+1]= (byte) (val >>> 8 & 0xff);
+        bts[offset]= (byte) (val & 0xff);
+    }
+    protected static void putShort(byte[] bts, int offset, short val){
+        bts[offset+1]= (byte) (val >>> 8 & 0xff);
+        bts[offset]= (byte) (val & 0xff);
+    }
 }
diff --git a/src/main/java/com/reandroid/arsc/item/ByteArray.java b/src/main/java/com/reandroid/arsc/item/ByteArray.java
index 1d1cd49..9eb530b 100755
--- a/src/main/java/com/reandroid/arsc/item/ByteArray.java
+++ b/src/main/java/com/reandroid/arsc/item/ByteArray.java
@@ -105,6 +105,9 @@ public class ByteArray extends BlockItem {
     }
     public final void putInteger(int offset, int val){
         byte[] bts = getBytesInternal();
+        if((offset+4)>bts.length){
+            return;
+        }
         bts[offset+3]= (byte) (val >>> 24 & 0xff);
         bts[offset+2]= (byte) (val >>> 16 & 0xff);
         bts[offset+1]= (byte) (val >>> 8 & 0xff);
@@ -112,6 +115,9 @@ public class ByteArray extends BlockItem {
     }
     public final int getInteger(int offset){
         byte[] bts = getBytesInternal();
+        if((offset+4)>bts.length){
+            return 0;
+        }
         return bts[offset] & 0xff |
                 (bts[offset+1] & 0xff) << 8 |
                 (bts[offset+2] & 0xff) << 16 |
diff --git a/src/main/java/com/reandroid/arsc/item/StringItem.java b/src/main/java/com/reandroid/arsc/item/StringItem.java
index eb37dea..35d2897 100755
--- a/src/main/java/com/reandroid/arsc/item/StringItem.java
+++ b/src/main/java/com/reandroid/arsc/item/StringItem.java
@@ -17,7 +17,7 @@ package com.reandroid.arsc.item;
 
 import com.reandroid.arsc.base.Block;
 import com.reandroid.arsc.io.BlockReader;
-import com.reandroid.arsc.pool.BaseStringPool;
+import com.reandroid.arsc.pool.StringPool;
 import com.reandroid.json.JSONConvert;
 import com.reandroid.json.JSONObject;
 
@@ -212,18 +212,18 @@ public class StringItem extends BlockItem implements JSONConvert<JSONObject> {
         return styleItem.getSpanInfoList().size()>0;
     }
     public StyleItem getStyle(){
-        BaseStringPool<?> stringPool=getStringPool();
+        StringPool<?> stringPool=getStringPool();
         if(stringPool==null){
             return null;
         }
         int index=getIndex();
         return stringPool.getStyle(index);
     }
-    private BaseStringPool<?> getStringPool(){
+    private StringPool<?> getStringPool(){
         Block parent=getParent();
         while (parent!=null){
-            if(parent instanceof BaseStringPool){
-                return (BaseStringPool<?>)parent;
+            if(parent instanceof StringPool){
+                return (StringPool<?>)parent;
             }
             parent=parent.getParent();
         }
diff --git a/src/main/java/com/reandroid/arsc/item/StyleItem.java b/src/main/java/com/reandroid/arsc/item/StyleItem.java
index 77890e0..3f18491 100755
--- a/src/main/java/com/reandroid/arsc/item/StyleItem.java
+++ b/src/main/java/com/reandroid/arsc/item/StyleItem.java
@@ -18,7 +18,7 @@ package com.reandroid.arsc.item;
 import com.reandroid.arsc.base.Block;
 import com.reandroid.arsc.io.BlockReader;
 import com.reandroid.arsc.model.StyleSpanInfo;
-import com.reandroid.arsc.pool.BaseStringPool;
+import com.reandroid.arsc.pool.StringPool;
 import com.reandroid.json.JSONConvert;
 import com.reandroid.json.JSONArray;
 import com.reandroid.json.JSONObject;
@@ -64,7 +64,7 @@ public class StyleItem extends IntegerArray implements JSONConvert<JSONObject> {
         super.put(i, val);
     }
     public void addStylePiece(String tag, int firstChar, int lastChar){
-        BaseStringPool<?> stringPool = getStringPool();
+        StringPool<?> stringPool = getStringPool();
         if(stringPool==null){
             throw new IllegalArgumentException("Null string pool, must be added to parent StyleArray first");
         }
@@ -188,7 +188,7 @@ public class StyleItem extends IntegerArray implements JSONConvert<JSONObject> {
         return mSpanInfoList;
     }
     private String getStringFromPool(int ref){
-        BaseStringPool<?> stringPool = getStringPool();
+        StringPool<?> stringPool = getStringPool();
         if(stringPool==null){
             return null;
         }
@@ -198,11 +198,11 @@ public class StyleItem extends IntegerArray implements JSONConvert<JSONObject> {
         }
         return stringItem.get();
     }
-    private BaseStringPool<?> getStringPool(){
+    private StringPool<?> getStringPool(){
         Block parent=getParent();
         while (parent!=null){
-            if(parent instanceof BaseStringPool){
-                return (BaseStringPool<?>)parent;
+            if(parent instanceof StringPool){
+                return (StringPool<?>)parent;
             }
             parent=parent.getParent();
         }
@@ -310,7 +310,7 @@ public class StyleItem extends IntegerArray implements JSONConvert<JSONObject> {
     public void addSpanInfo(String tag, int first, int last){
         int index=getStylePieceCount();
         setStylePieceCount(index+1);
-        BaseStringPool<?> stringPool = getStringPool();
+        StringPool<?> stringPool = getStringPool();
         if(stringPool==null){
             throw new IllegalArgumentException("Null string pool, must be added to parent StyleArray first");
         }
diff --git a/src/main/java/com/reandroid/arsc/item/TypeString.java b/src/main/java/com/reandroid/arsc/item/TypeString.java
index 1c997fb..6ce504c 100755
--- a/src/main/java/com/reandroid/arsc/item/TypeString.java
+++ b/src/main/java/com/reandroid/arsc/item/TypeString.java
@@ -23,13 +23,13 @@ package com.reandroid.arsc.item;
     public TypeString(boolean utf8) {
         super(utf8);
     }
-    public byte getId(){
+    public int getId(){
         TypeStringPool stringPool=getTypeStringPool();
         if(stringPool!=null){
             return stringPool.idOf(this);
         }
         // Should not reach here , this means it not added to string pool
-        return (byte) (getIndex()+1);
+        return getIndex()+1;
     }
     @Override
     public StyleItem getStyle(){
diff --git a/src/main/java/com/reandroid/arsc/value/EntryBlock.java b/src/main/java/com/reandroid/arsc/value/EntryBlock.java
index 5363134..7364510 100755
--- a/src/main/java/com/reandroid/arsc/value/EntryBlock.java
+++ b/src/main/java/com/reandroid/arsc/value/EntryBlock.java
@@ -475,7 +475,7 @@ public class EntryBlock extends Block implements JSONConvert<JSONObject> {
             return 0;
         }
         int pkgId=packageBlock.getId();
-        int typeId=typeBlock.getTypeIdInt();
+        int typeId=typeBlock.getId();
         int entryId=getIndex();
         return ((pkgId << 24) | (typeId << 16) | entryId);
     }
@@ -607,7 +607,7 @@ public class EntryBlock extends Block implements JSONConvert<JSONObject> {
         if(isNull()){
             return;
         }
-        counter.addCount(countBytes());
+        //counter.addCount(countBytes());
         entryHeader.onCountUpTo(counter);
         mSpecReference.onCountUpTo(counter);
         mResValue.onCountUpTo(counter);
@@ -712,7 +712,7 @@ public class EntryBlock extends Block implements JSONConvert<JSONObject> {
         mResValue.onDataLoaded();
     }
     public void merge(EntryBlock entryBlock){
-        if(entryBlock==null||entryBlock==this||entryBlock.isNull()){
+        if(!shouldMerge(entryBlock)){
             return;
         }
         String name=entryBlock.getName();
@@ -736,6 +736,27 @@ public class EntryBlock extends Block implements JSONConvert<JSONObject> {
         setPublic(entryBlock.isPublic());
         setWeak(entryBlock.isWeak());
     }
+    private boolean shouldMerge(EntryBlock coming){
+        if(coming == null || coming == this || coming.isNull()){
+            return false;
+        }
+        if(this.isNull()){
+            return true;
+        }
+        BaseResValue value = this.getResValue();
+        if(value instanceof ResValueInt){
+            ValueType valueType = ((ResValueInt)value).getValueType();
+            if(valueType==null || valueType==ValueType.NULL){
+                return true;
+            }
+        }
+        value = coming.getResValue();
+        if(value instanceof ResValueInt){
+            ValueType valueType = ((ResValueInt)value).getValueType();
+            return valueType!=null && valueType != ValueType.NULL;
+        }
+        return true;
+    }
     private ResValueBag getOrCreateResValueBag(){
         if(mResValue instanceof ResValueBag){
             return (ResValueBag) mResValue;
diff --git a/src/main/java/com/reandroid/arsc/value/ResValueBag.java b/src/main/java/com/reandroid/arsc/value/ResValueBag.java
index c3798ba..5d72da8 100755
--- a/src/main/java/com/reandroid/arsc/value/ResValueBag.java
+++ b/src/main/java/com/reandroid/arsc/value/ResValueBag.java
@@ -166,7 +166,7 @@ public class ResValueBag extends BaseResValue {
         refreshCount();
     }
     public void merge(ResValueBag resValueBag){
-        if(resValueBag==null||resValueBag==this){
+        if(resValueBag==null || resValueBag==this || resValueBag.getCount()==0){
             return;
         }
         setParentId(resValueBag.getParentId());
diff --git a/src/main/java/com/reandroid/arsc/value/ResValueBagItem.java b/src/main/java/com/reandroid/arsc/value/ResValueBagItem.java
index 425fd3e..0e0bcdb 100755
--- a/src/main/java/com/reandroid/arsc/value/ResValueBagItem.java
+++ b/src/main/java/com/reandroid/arsc/value/ResValueBagItem.java
@@ -228,6 +228,8 @@ public class ResValueBagItem extends BaseResValueItem{
         }else {
             builder.append("Unknown");
         }
+        builder.append(" size=").append(getHeaderSize());
+        builder.append(" bytes=").append(countBytes());
         builder.append('(');
         builder.append(String.format("0x%02x", getType()));
         builder.append(") id=");