diff --git a/c/tlv_box.c b/c/tlv_box.c
index e1a245e..33f458b 100644
--- a/c/tlv_box.c
+++ b/c/tlv_box.c
@@ -14,6 +14,8 @@
 #include <string.h>
 #include "tlv_box.h"
 
+int tlv_box_putobject(tlv_box_t *box, int type, void *value, int length);
+
 static void tlv_box_release_tlv(value_t value)
 {
     tlv_t *tlv = (tlv_t *)value.value;
@@ -37,7 +39,7 @@ tlv_box_t *tlv_box_parse(unsigned char *buffer, int buffersize)
     unsigned char *cached = (unsigned char*) malloc(buffersize);
     memcpy(cached, buffer, buffersize);
 
-    int offset = 0, length = 0;
+    int offset = 0;
     while (offset < buffersize) {
         int type = (*(int *)(cached + offset));
         offset += sizeof(int);
@@ -103,21 +105,41 @@ int tlv_box_put_char(tlv_box_t *box, int type, char value)
     return tlv_box_putobject(box, type, &value, sizeof(char));
 }
 
+int tlv_box_put_uchar(tlv_box_t *box, int type, unsigned char value)
+{
+    return tlv_box_putobject(box, type, &value, sizeof(unsigned char));
+}
+
 int tlv_box_put_short(tlv_box_t *box, int type, short value)
 {
     return tlv_box_putobject(box, type, &value, sizeof(short));
 }
 
+int tlv_box_put_ushort(tlv_box_t *box, int type, unsigned short value)
+{
+    return tlv_box_putobject(box, type, &value, sizeof(unsigned short));
+}
+
 int tlv_box_put_int(tlv_box_t *box, int type, int value)
 {
     return tlv_box_putobject(box, type, &value, sizeof(int));
 }
 
+int tlv_box_put_uint(tlv_box_t *box, int type, unsigned int value)
+{
+    return tlv_box_putobject(box, type, &value, sizeof(unsigned int));
+}
+
 int tlv_box_put_long(tlv_box_t *box, int type, long value)
 {
     return tlv_box_putobject(box, type, &value, sizeof(long));
 }
 
+int tlv_box_put_ulong(tlv_box_t *box, int type, unsigned long value)
+{
+    return tlv_box_putobject(box, type, &value, sizeof(unsigned long));
+}
+
 int tlv_box_put_longlong(tlv_box_t *box, int type, long long value)
 {
     return tlv_box_putobject(box, type, &value, sizeof(long long));
@@ -182,6 +204,17 @@ int tlv_box_get_char(tlv_box_t *box, int type, char *value)
     return 0;
 }
 
+int tlv_box_get_uchar(tlv_box_t *box, int type, unsigned char *value)
+{
+    value_t object;
+    if (key_list_get(box->m_list, type, &object) != 0) {
+        return -1;
+    }
+    tlv_t *tlv = (tlv_t *) object.value;
+    *value = (*(unsigned char *)(tlv->value));
+    return 0;
+}
+
 int tlv_box_get_short(tlv_box_t *box, int type, short *value)
 {
     value_t object;
@@ -193,6 +226,17 @@ int tlv_box_get_short(tlv_box_t *box, int type, short *value)
     return 0;
 }
 
+int tlv_box_get_ushort(tlv_box_t *box, int type, unsigned short *value)
+{
+    value_t object;
+    if (key_list_get(box->m_list, type, &object) != 0) {
+        return -1;
+    }
+    tlv_t *tlv = (tlv_t *) object.value;
+    *value = (*(unsigned short *)(tlv->value));
+    return 0;
+}
+
 int tlv_box_get_int(tlv_box_t *box, int type, int *value)
 {
     value_t object;
@@ -204,6 +248,17 @@ int tlv_box_get_int(tlv_box_t *box, int type, int *value)
     return 0;
 }
 
+int tlv_box_get_uint(tlv_box_t *box, int type, unsigned int *value)
+{
+    value_t object;
+    if (key_list_get(box->m_list, type, &object) != 0) {
+        return -1;
+    }
+    tlv_t *tlv = (tlv_t *) object.value;
+    *value = (*(unsigned int *)(tlv->value));
+    return 0;
+}
+
 int tlv_box_get_long(tlv_box_t *box, int type, long *value)
 {
     value_t object;
@@ -215,6 +270,17 @@ int tlv_box_get_long(tlv_box_t *box, int type, long *value)
     return 0;
 }
 
+int tlv_box_get_ulong(tlv_box_t *box, int type, unsigned long *value)
+{
+    value_t object;
+    if (key_list_get(box->m_list, type, &object) != 0) {
+        return -1;
+    }
+    tlv_t *tlv = (tlv_t *) object.value;
+    *value = (*(unsigned long *)(tlv->value));
+    return 0;
+}
+
 int tlv_box_get_longlong(tlv_box_t *box, int type, long long *value)
 {
     value_t object;
@@ -250,7 +316,7 @@ int tlv_box_get_double(tlv_box_t *box, int type, double *value)
 
 int tlv_box_get_string(tlv_box_t *box, int type, char *value, int* length)
 {
-    return tlv_box_get_bytes(box,type,value,length);
+    return tlv_box_get_bytes(box,type,(unsigned char *)value,length);
 }
 
 int tlv_box_get_bytes(tlv_box_t *box, int type, unsigned char *value, int* length)
@@ -290,4 +356,5 @@ int tlv_box_get_object(tlv_box_t *box, int type, tlv_box_t **object)
     tlv_t *tlv = (tlv_t *) value.value;
     *object = (tlv_box_t *)tlv_box_parse(tlv->value, tlv->length);
     return 0;
-}
\ No newline at end of file
+}
+
diff --git a/c/tlv_box.h b/c/tlv_box.h
index 7631929..55447a4 100644
--- a/c/tlv_box.h
+++ b/c/tlv_box.h
@@ -35,9 +35,13 @@ unsigned char *tlv_box_get_buffer(tlv_box_t *box);
 int tlv_box_get_size(tlv_box_t *box);
 
 int tlv_box_put_char(tlv_box_t *box,int type,char value);
+int tlv_box_put_uchar(tlv_box_t *box,int type,unsigned char value);
 int tlv_box_put_short(tlv_box_t *box,int type,short value);
+int tlv_box_put_ushort(tlv_box_t *box,int type,unsigned short value);
 int tlv_box_put_int(tlv_box_t *box,int type,int value);
+int tlv_box_put_uint(tlv_box_t *box,int type,unsigned int value);
 int tlv_box_put_long(tlv_box_t *box,int type,long value);
+int tlv_box_put_ulong(tlv_box_t *box,int type,unsigned long value);
 int tlv_box_put_longlong(tlv_box_t *box,int type,long long value);
 int tlv_box_put_float(tlv_box_t *box,int type,float value);
 int tlv_box_put_double(tlv_box_t *box,int type,double value);
@@ -47,9 +51,13 @@ int tlv_box_put_object(tlv_box_t *box,int type,tlv_box_t *object);
 int tlv_box_serialize(tlv_box_t *box);
 
 int tlv_box_get_char(tlv_box_t *box,int type,char *value);
+int tlv_box_get_uchar(tlv_box_t *box,int type,unsigned char *value);
 int tlv_box_get_short(tlv_box_t *box,int type,short *value);
+int tlv_box_get_ushort(tlv_box_t *box,int type,unsigned short *value);
 int tlv_box_get_int(tlv_box_t *box,int type,int *value);
+int tlv_box_get_uint(tlv_box_t *box,int type,unsigned int *value);
 int tlv_box_get_long(tlv_box_t *box,int type,long *value);
+int tlv_box_get_ulong(tlv_box_t *box,int type,unsigned long *value);
 int tlv_box_get_longlong(tlv_box_t *box,int type,long long *value);
 int tlv_box_get_float(tlv_box_t *box,int type,float *value);
 int tlv_box_get_double(tlv_box_t *box,int type,double *value);