diff --git a/bindings/java/capstone/Arm.java b/bindings/java/capstone/Arm.java
index 198a1f4a7e..a308a0b202 100644
--- a/bindings/java/capstone/Arm.java
+++ b/bindings/java/capstone/Arm.java
@@ -57,7 +57,7 @@ public static class MemType extends Structure {
     public int base;
     public int index;
     public int scale;
-    public long disp;
+    public int disp;
 
     @Override
     public List getFieldOrder() {
@@ -67,7 +67,7 @@ public List getFieldOrder() {
 
   public static class OpValue extends Union {
     public int reg;
-    public long imm;
+    public int imm;
     public double fp;
     public MemType mem;
 
@@ -99,7 +99,7 @@ public void read() {
       if (type == ARM_OP_FP)
         value.setType(Double.TYPE);
       if (type == ARM_OP_PIMM || type == ARM_OP_IMM || type == ARM_OP_CIMM)
-        value.setType(Long.TYPE);
+        value.setType(Integer.TYPE);
       if (type == ARM_OP_REG)
         value.setType(Integer.TYPE);
       if (type == ARM_OP_INVALID)
@@ -122,12 +122,12 @@ public static class UnionOpInfo extends Capstone.UnionOpInfo {
 
     public Operand [] op;
 
-    public UnionOpInfo(){ 
-      op = new Operand[32];
+    public UnionOpInfo(){
+      op = new Operand[20];
     }
 
     public UnionOpInfo(Pointer p){
-      op = new Operand[32];
+      op = new Operand[20];
       useMemory(p);
       read();
     }
@@ -142,6 +142,7 @@ public void read() {
       readField("_update_flags");
       readField("_writeback");
       readField("op_count");
+      if (op_count == 0) return;
       op = new Operand[op_count];
       readField("op");
     }
diff --git a/bindings/java/capstone/Arm64.java b/bindings/java/capstone/Arm64.java
index 06cf9c9be3..e7936e19c6 100644
--- a/bindings/java/capstone/Arm64.java
+++ b/bindings/java/capstone/Arm64.java
@@ -62,7 +62,7 @@ public class Arm64 {
   public static class MemType extends Structure {
     public int base;
     public int index;
-    public long disp;
+    public int disp;
 
     @Override
     public List getFieldOrder() {
@@ -72,7 +72,7 @@ public List getFieldOrder() {
 
   public static class OpValue extends Union {
     public int reg;
-    public long imm;
+    public int imm;
     public double fp;
     public MemType mem;
 
@@ -104,9 +104,7 @@ public void read() {
         value.setType(MemType.class);
       if (type == ARM64_OP_FP)
         value.setType(Double.TYPE);
-      if (type == ARM64_OP_IMM || type == ARM64_OP_CIMM)
-        value.setType(Long.TYPE);
-      if (type == ARM64_OP_REG)
+      if (type == ARM64_OP_IMM || type == ARM64_OP_CIMM || type == ARM64_OP_REG)
         value.setType(Integer.TYPE);
       if (type == ARM64_OP_INVALID)
         return;
@@ -130,11 +128,11 @@ public static class UnionOpInfo extends Capstone.UnionOpInfo {
     public Operand [] op;
 
     public UnionOpInfo() {
-      op = new Operand[32];
+      op = new Operand[8];
     }
 
     public UnionOpInfo(Pointer p) {
-      op = new Operand[32];
+      op = new Operand[8];
       useMemory(p);
       read();
     }
@@ -148,6 +146,7 @@ public void read() {
       readField("_update_flags");
       readField("_writeback");
       readField("op_count");
+      if (op_count == 0) return;
       op = new Operand[op_count];
       readField("op");
     }
diff --git a/bindings/java/capstone/Capstone.java b/bindings/java/capstone/Capstone.java
index 4e71e39f72..38a7e97326 100644
--- a/bindings/java/capstone/Capstone.java
+++ b/bindings/java/capstone/Capstone.java
@@ -5,9 +5,10 @@
 
 import com.sun.jna.Library;
 import com.sun.jna.Native;
+import com.sun.jna.NativeLong;
+import com.sun.jna.ptr.NativeLongByReference;
 import com.sun.jna.Structure;
 import com.sun.jna.Union;
-import com.sun.jna.ptr.LongByReference;
 import com.sun.jna.Pointer;
 import com.sun.jna.ptr.PointerByReference;
 import com.sun.jna.ptr.IntByReference;
@@ -26,12 +27,15 @@ protected static abstract class OpInfo {}
   protected static abstract class UnionOpInfo extends Structure {}
 
   protected static int max(int a, int b, int c, int d) {
-    return Math.max(Math.max(Math.max(a,b),c),d);
+    if (a<b) a = b;
+    if (c<d) c = d;
+    if (a<c) a = c;
+    return a;
   }
 
   protected static class _cs_insn extends Structure {
     public int id;
-    public long address;
+    public NativeLong address;
     public short size;
     public byte[] mnemonic = new byte[32];
     public byte[] operands = new byte[96];
@@ -40,13 +44,13 @@ protected static class _cs_insn extends Structure {
     public int[] groups = new int[8];
 
     public _cs_insn(Pointer p) {
-        mnemonic = new byte[32];
-        operands = new byte[96];
-        regs_read = new int[32];
-        regs_write = new int[32];
-        groups = new int[8];
-        useMemory(p);
-        read();
+      mnemonic = new byte[32];
+      operands = new byte[96];
+      regs_read = new int[32];
+      regs_write = new int[32];
+      groups = new int[8];
+      useMemory(p);
+      read();
     }
 
     @Override
@@ -58,7 +62,7 @@ public List getFieldOrder() {
   public static class cs_insn {
     public OpInfo op_info;
     public Pointer ptr_origin;
-    public long csh;
+    public NativeLong csh;
 
     public int id;
     public long address;
@@ -70,11 +74,11 @@ public static class cs_insn {
     public int[] groups;
 
     private CS cs;
-    private int _size;
+    private static int _size = -1;
 
-    public cs_insn (_cs_insn struct, Pointer _ptr_origin, long _csh, CS _cs, OpInfo _op_info) {
+    public cs_insn (_cs_insn struct, Pointer _ptr_origin, NativeLong _csh, CS _cs, OpInfo _op_info) {
       id = struct.id;
-      address = struct.address;
+      address = struct.address.longValue();
       size = struct.size;
       mnemonic = new String(struct.mnemonic).replace("\u0000","");
       operands = new String(struct.operands).replace("\u0000","");
@@ -86,7 +90,12 @@ public cs_insn (_cs_insn struct, Pointer _ptr_origin, long _csh, CS _cs, OpInfo
       op_info = _op_info;
       csh = _csh;
       cs = _cs;
-      _size = struct.size() + max( Arm.UnionOpInfo.getSize(), Arm64.UnionOpInfo.getSize(), Mips.UnionOpInfo.getSize(), X86.UnionOpInfo.getSize() );
+
+      // cache the size so we do not need to recompute the offset everytime
+      if (_size == -1)
+        _size = struct.size() + Arm.UnionOpInfo.getSize();
+        // Arm is the max, so we optimized it here, a more generic way is as follows:
+        // = max( Arm.UnionOpInfo.getSize(), Arm64.UnionOpInfo.getSize(), Mips.UnionOpInfo.getSize(), X86.UnionOpInfo.getSize() );
     }
 
     protected int size() {
@@ -169,21 +178,21 @@ private cs_insn[] fromArrayPointer(Pointer pointer, int numberResults)
   }
 
   private interface CS extends Library {
-    public int cs_open(int arch, int mode, LongByReference handle);
-    public long cs_disasm_dyn(long handle, byte[] code, long code_len,
-        long addr, long count, PointerByReference insn);
+    public int cs_open(int arch, int mode, NativeLongByReference handle);
+    public NativeLong cs_disasm_dyn(NativeLong handle, byte[] code, NativeLong code_len,
+        NativeLong addr, NativeLong count, PointerByReference insn);
     public void cs_free(Pointer p);
-    public int cs_close(long handle);
-    public String cs_reg_name(long csh, int id);
-    public int cs_op_count(long csh, Pointer insn, int type);
-    public int cs_op_index(long csh, Pointer insn, int type, int index);
-
-    public String cs_insn_name(long csh, int id);
-    public byte cs_insn_group(long csh, Pointer insn, int id);
-    public byte cs_reg_read(long csh, Pointer insn, int id);
-    public byte cs_reg_write(long csh, Pointer insn, int id);
+    public int cs_close(NativeLong handle);
+    public String cs_reg_name(NativeLong csh, int id);
+    public int cs_op_count(NativeLong csh, Pointer insn, int type);
+    public int cs_op_index(NativeLong csh, Pointer insn, int type, int index);
+
+    public String cs_insn_name(NativeLong csh, int id);
+    public byte cs_insn_group(NativeLong csh, Pointer insn, int id);
+    public byte cs_reg_read(NativeLong csh, Pointer insn, int id);
+    public byte cs_reg_write(NativeLong csh, Pointer insn, int id);
     public void cs_version(IntByReference major, IntByReference minor);
-    public int cs_errno(long csh);
+    public int cs_errno(NativeLong csh);
   }
 
   public static final int CS_ARCH_ARM = 0;
@@ -210,7 +219,7 @@ public long cs_disasm_dyn(long handle, byte[] code, long code_len,
   public static final int CS_ERR_MODE = 5;	  // Invalid/unsupported mode
 
 
-  private long csh;
+  private NativeLong csh;
   private PointerByReference insnRef;
   private CS cs;
 
@@ -219,7 +228,7 @@ public Capstone(int arch, int mode)
     this.arch = arch;
     this.mode = mode;
     cs = (CS)Native.loadLibrary("capstone", CS.class);
-    LongByReference handleref = new LongByReference();
+    NativeLongByReference handleref = new NativeLongByReference();
     if (cs.cs_open(arch, mode, handleref) != CS_ERR_OK) {
       throw new RuntimeException("ERROR: Wrong arch or mode");
     }
@@ -241,10 +250,10 @@ public cs_insn[] disasm(byte[] code, long address) {
   public cs_insn[] disasm(byte[] code, long address, long count) {
     insnRef = new PointerByReference();
 
-    long c = cs.cs_disasm_dyn(csh, code, code.length, address, count, insnRef);
+    NativeLong c = cs.cs_disasm_dyn(csh, code, new NativeLong(code.length), new NativeLong(address), new NativeLong(count), insnRef);
 
     Pointer p = insnRef.getValue();
-    cs_insn[] all_insn = fromArrayPointer(p, (int)c);
+    cs_insn[] all_insn = fromArrayPointer(p, c.intValue());
     return all_insn;
   }
 }
diff --git a/bindings/java/capstone/Mips.java b/bindings/java/capstone/Mips.java
index 37f6761e58..78b342d366 100644
--- a/bindings/java/capstone/Mips.java
+++ b/bindings/java/capstone/Mips.java
@@ -63,7 +63,7 @@ public List getFieldOrder() {
   }
 
   public static class UnionOpInfo extends Capstone.UnionOpInfo {
-    public short op_count;
+    public byte op_count;
     public Operand [] op;
 
     public UnionOpInfo() {
@@ -82,6 +82,7 @@ public static int getSize() {
 
     public void read() {
       readField("op_count");
+      if (op_count ==0) return;
       op = new Operand[op_count];
       readField("op");
     }
diff --git a/bindings/java/capstone/X86.java b/bindings/java/capstone/X86.java
index cf70f956e5..5682c3edef 100644
--- a/bindings/java/capstone/X86.java
+++ b/bindings/java/capstone/X86.java
@@ -84,7 +84,7 @@ public static class UnionOpInfo extends Capstone.UnionOpInfo {
     public byte sib_scale;
     public int sib_base;
 
-    public int op_count;
+    public char op_count;
 
     public Operand [] op;
 
diff --git a/bindings/python/test_arm.py b/bindings/python/test_arm.py
index bf3c4d9c66..ea7b635906 100755
--- a/bindings/python/test_arm.py
+++ b/bindings/python/test_arm.py
@@ -27,6 +27,13 @@ def to_x(s):
     while x[0] == '0': x = x[1:]
     return x
 
+def to_x_32(s):
+    from struct import pack
+    if not s: return '0'
+    x = pack(">i", s).encode('hex')
+    while x[0] == '0': x = x[1:]
+    return x
+
 ### Test class cs
 def test_class():
     def print_insn_detail(insn):
@@ -40,7 +47,7 @@ def print_insn_detail(insn):
                 if i.type == ARM_OP_REG:
 			        print("\t\toperands[%u].type: REG = %s" %(c, insn.reg_name(i.value.reg)))
                 if i.type == ARM_OP_IMM:
-			        print("\t\toperands[%u].type: IMM = 0x%s" %(c, to_x(i.value.imm)))
+			        print("\t\toperands[%u].type: IMM = 0x%s" %(c, to_x_32(i.value.imm)))
                 if i.type == ARM_OP_PIMM:
 			        print("\t\toperands[%u].type: P-IMM = %u" %(c, i.value.imm))
                 if i.type == ARM_OP_CIMM:
@@ -60,7 +67,7 @@ def print_insn_detail(insn):
                             %(c, i.value.mem.scale))
                     if i.value.mem.disp != 0:
                         print("\t\t\toperands[%u].mem.disp: 0x%s" \
-                            %(c, to_x(i.value.mem.disp)))
+                            %(c, to_x_32(i.value.mem.disp)))
 
                 if i.shift.type != ARM_SFT_INVALID and i.shift.value:
 		            print("\t\t\tShift: type = %u, value = %u\n" \