diff --git a/store/db.go b/store/db.go
index 76c63e3..ca57326 100644
--- a/store/db.go
+++ b/store/db.go
@@ -19,6 +19,16 @@ func (db *DB) NewWriteBatch() WriteBatch {
 	return db.IDB.NewWriteBatch()
 }
 
+func (db *DB) NewSnapshot() (*Snapshot, error) {
+	var err error
+	s := &Snapshot{}
+	if s.ISnapshot, err = db.IDB.NewSnapshot(); err != nil {
+		return nil, err
+	}
+
+	return s, nil
+}
+
 func (db *DB) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
 	return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
 }
diff --git a/store/hyperleveldb/db.go b/store/hyperleveldb/db.go
index e8ec944..6d0e176 100644
--- a/store/hyperleveldb/db.go
+++ b/store/hyperleveldb/db.go
@@ -234,10 +234,8 @@ func (db *DB) get(ro *ReadOptions, key []byte) ([]byte, error) {
 		k = (*C.char)(unsafe.Pointer(&key[0]))
 	}
 
-	var value *C.char
-
-	c := C.hyperleveldb_get_ext(
-		db.db, ro.Opt, k, C.size_t(len(key)), &value, &vallen, &errStr)
+	value := C.leveldb_get(
+		db.db, ro.Opt, k, C.size_t(len(key)), &vallen, &errStr)
 
 	if errStr != nil {
 		return nil, saveError(errStr)
@@ -247,7 +245,7 @@ func (db *DB) get(ro *ReadOptions, key []byte) ([]byte, error) {
 		return nil, nil
 	}
 
-	defer C.hyperleveldb_get_free_ext(unsafe.Pointer(c))
+	defer C.leveldb_free(unsafe.Pointer(value))
 
 	return C.GoBytes(unsafe.Pointer(value), C.int(vallen)), nil
 }
diff --git a/store/hyperleveldb/hyperleveldb_ext.cc b/store/hyperleveldb/hyperleveldb_ext.cc
index dab687c..f775ee9 100644
--- a/store/hyperleveldb/hyperleveldb_ext.cc
+++ b/store/hyperleveldb/hyperleveldb_ext.cc
@@ -3,60 +3,60 @@
 #include "hyperleveldb_ext.h"
 
 #include <stdlib.h>
-#include <string>
+//#include <string>
 
-#include "hyperleveldb/db.h"
+//#include "hyperleveldb/db.h"
 
-using namespace leveldb;
+//using namespace leveldb;
 
 extern "C" {
 
-static bool SaveError(char** errptr, const Status& s) {
-  assert(errptr != NULL);
-  if (s.ok()) {
-    return false;
-  } else if (*errptr == NULL) {
-    *errptr = strdup(s.ToString().c_str());
-  } else {
-    free(*errptr);
-    *errptr = strdup(s.ToString().c_str());
-  }
-  return true;
-}
+// static bool SaveError(char** errptr, const Status& s) {
+//   assert(errptr != NULL);
+//   if (s.ok()) {
+//     return false;
+//   } else if (*errptr == NULL) {
+//     *errptr = strdup(s.ToString().c_str());
+//   } else {
+//     free(*errptr);
+//     *errptr = strdup(s.ToString().c_str());
+//   }
+//   return true;
+// }
 
-void* hyperleveldb_get_ext(
-    leveldb_t* db,
-    const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
-    char** valptr,
-    size_t* vallen,
-    char** errptr) {
+// void* hyperleveldb_get_ext(
+//     leveldb_t* db,
+//     const leveldb_readoptions_t* options,
+//     const char* key, size_t keylen,
+//     char** valptr,
+//     size_t* vallen,
+//     char** errptr) {
 
-    std::string *tmp = new(std::string);
+//     std::string *tmp = new(std::string);
 
-    //very tricky, maybe changed with c++ leveldb upgrade
-    Status s = (*(DB**)db)->Get(*(ReadOptions*)options, Slice(key, keylen), tmp);
+//     //very tricky, maybe changed with c++ leveldb upgrade
+//     Status s = (*(DB**)db)->Get(*(ReadOptions*)options, Slice(key, keylen), tmp);
 
-    if (s.ok()) {
-        *valptr = (char*)tmp->data();
-        *vallen = tmp->size();
-    } else {
-        delete(tmp);
-        tmp = NULL;
-        *valptr = NULL;
-        *vallen = 0;
-        if (!s.IsNotFound()) {
-            SaveError(errptr, s);
-        }
-    }
-    return tmp;
-}
+//     if (s.ok()) {
+//         *valptr = (char*)tmp->data();
+//         *vallen = tmp->size();
+//     } else {
+//         delete(tmp);
+//         tmp = NULL;
+//         *valptr = NULL;
+//         *vallen = 0;
+//         if (!s.IsNotFound()) {
+//             SaveError(errptr, s);
+//         }
+//     }
+//     return tmp;
+// }
 
-void hyperleveldb_get_free_ext(void* context) {
-    std::string* s = (std::string*)context;
+// void hyperleveldb_get_free_ext(void* context) {
+//     std::string* s = (std::string*)context;
 
-    delete(s);
-}
+//     delete(s);
+// }
 
 
 unsigned char hyperleveldb_iter_seek_to_first_ext(leveldb_iterator_t* iter) {
diff --git a/store/hyperleveldb/hyperleveldb_ext.h b/store/hyperleveldb/hyperleveldb_ext.h
index 940a090..9182768 100644
--- a/store/hyperleveldb/hyperleveldb_ext.h
+++ b/store/hyperleveldb/hyperleveldb_ext.h
@@ -10,19 +10,19 @@ extern "C" {
 #include "hyperleveldb/c.h"
 
 
-/* Returns NULL if not found. Otherwise stores the value in **valptr.
-   Stores the length of the value in *vallen. 
-   Returns a context must be later to free*/
-extern void* hyperleveldb_get_ext(
-    leveldb_t* db,
-    const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
-    char** valptr,
-    size_t* vallen,
-    char** errptr);
+// /* Returns NULL if not found. Otherwise stores the value in **valptr.
+//    Stores the length of the value in *vallen. 
+//    Returns a context must be later to free*/
+// extern void* hyperleveldb_get_ext(
+//     leveldb_t* db,
+//     const leveldb_readoptions_t* options,
+//     const char* key, size_t keylen,
+//     char** valptr,
+//     size_t* vallen,
+//     char** errptr);
 
-// Free context returns by hyperleveldb_get_ext
-extern void hyperleveldb_get_free_ext(void* context);
+// // Free context returns by hyperleveldb_get_ext
+// extern void hyperleveldb_get_free_ext(void* context);
 
 
 // Below iterator functions like leveldb iterator but returns valid status for iterator
diff --git a/store/leveldb/db.go b/store/leveldb/db.go
index 0a40953..43ee0c2 100644
--- a/store/leveldb/db.go
+++ b/store/leveldb/db.go
@@ -234,10 +234,8 @@ func (db *DB) get(ro *ReadOptions, key []byte) ([]byte, error) {
 		k = (*C.char)(unsafe.Pointer(&key[0]))
 	}
 
-	var value *C.char
-
-	c := C.leveldb_get_ext(
-		db.db, ro.Opt, k, C.size_t(len(key)), &value, &vallen, &errStr)
+	value := C.leveldb_get(
+		db.db, ro.Opt, k, C.size_t(len(key)), &vallen, &errStr)
 
 	if errStr != nil {
 		return nil, saveError(errStr)
@@ -247,7 +245,7 @@ func (db *DB) get(ro *ReadOptions, key []byte) ([]byte, error) {
 		return nil, nil
 	}
 
-	defer C.leveldb_get_free_ext(unsafe.Pointer(c))
+	defer C.leveldb_free(unsafe.Pointer(value))
 
 	return C.GoBytes(unsafe.Pointer(value), C.int(vallen)), nil
 }
diff --git a/store/leveldb/leveldb_ext.cc b/store/leveldb/leveldb_ext.cc
index 96d6541..a362ab5 100644
--- a/store/leveldb/leveldb_ext.cc
+++ b/store/leveldb/leveldb_ext.cc
@@ -3,60 +3,60 @@
 #include "leveldb_ext.h"
 
 #include <stdlib.h>
-#include <string>
+//#include <string>
 
-#include "leveldb/db.h"
+//#include "leveldb/db.h"
 
-using namespace leveldb;
+//using namespace leveldb;
 
 extern "C" {
 
-static bool SaveError(char** errptr, const Status& s) {
-  assert(errptr != NULL);
-  if (s.ok()) {
-    return false;
-  } else if (*errptr == NULL) {
-    *errptr = strdup(s.ToString().c_str());
-  } else {
-    free(*errptr);
-    *errptr = strdup(s.ToString().c_str());
-  }
-  return true;
-}
+// static bool SaveError(char** errptr, const Status& s) {
+//   assert(errptr != NULL);
+//   if (s.ok()) {
+//     return false;
+//   } else if (*errptr == NULL) {
+//     *errptr = strdup(s.ToString().c_str());
+//   } else {
+//     free(*errptr);
+//     *errptr = strdup(s.ToString().c_str());
+//   }
+//   return true;
+// }
 
-void* leveldb_get_ext(
-    leveldb_t* db,
-    const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
-    char** valptr,
-    size_t* vallen,
-    char** errptr) {
+// void* leveldb_get_ext(
+//     leveldb_t* db,
+//     const leveldb_readoptions_t* options,
+//     const char* key, size_t keylen,
+//     char** valptr,
+//     size_t* vallen,
+//     char** errptr) {
 
-    std::string *tmp = new(std::string);
+//     std::string *tmp = new(std::string);
 
-    //very tricky, maybe changed with c++ leveldb upgrade
-    Status s = (*(DB**)db)->Get(*(ReadOptions*)options, Slice(key, keylen), tmp);
+//     //very tricky, maybe changed with c++ leveldb upgrade
+//     Status s = (*(DB**)db)->Get(*(ReadOptions*)options, Slice(key, keylen), tmp);
 
-    if (s.ok()) {
-        *valptr = (char*)tmp->data();
-        *vallen = tmp->size();
-    } else {
-        delete(tmp);
-        tmp = NULL;
-        *valptr = NULL;
-        *vallen = 0;
-        if (!s.IsNotFound()) {
-            SaveError(errptr, s);
-        }
-    }
-    return tmp;
-}
+//     if (s.ok()) {
+//         *valptr = (char*)tmp->data();
+//         *vallen = tmp->size();
+//     } else {
+//         delete(tmp);
+//         tmp = NULL;
+//         *valptr = NULL;
+//         *vallen = 0;
+//         if (!s.IsNotFound()) {
+//             SaveError(errptr, s);
+//         }
+//     }
+//     return tmp;
+// }
 
-void leveldb_get_free_ext(void* context) {
-    std::string* s = (std::string*)context;
+// void leveldb_get_free_ext(void* context) {
+//     std::string* s = (std::string*)context;
 
-    delete(s);
-}
+//     delete(s);
+// }
 
 
 unsigned char leveldb_iter_seek_to_first_ext(leveldb_iterator_t* iter) {
diff --git a/store/leveldb/leveldb_ext.h b/store/leveldb/leveldb_ext.h
index 8222ae3..1c5f986 100644
--- a/store/leveldb/leveldb_ext.h
+++ b/store/leveldb/leveldb_ext.h
@@ -10,19 +10,19 @@ extern "C" {
 #include "leveldb/c.h"
 
 
-/* Returns NULL if not found. Otherwise stores the value in **valptr.
-   Stores the length of the value in *vallen. 
-   Returns a context must be later to free*/
-extern void* leveldb_get_ext(
-    leveldb_t* db,
-    const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
-    char** valptr,
-    size_t* vallen,
-    char** errptr);
+// /* Returns NULL if not found. Otherwise stores the value in **valptr.
+//    Stores the length of the value in *vallen. 
+//    Returns a context must be later to free*/
+// extern void* leveldb_get_ext(
+//     leveldb_t* db,
+//     const leveldb_readoptions_t* options,
+//     const char* key, size_t keylen,
+//     char** valptr,
+//     size_t* vallen,
+//     char** errptr);
 
-// Free context returns by leveldb_get_ext
-extern void leveldb_get_free_ext(void* context);
+// // Free context returns by leveldb_get_ext
+// extern void leveldb_get_free_ext(void* context);
 
 
 // Below iterator functions like leveldb iterator but returns valid status for iterator
diff --git a/store/snapshot.go b/store/snapshot.go
new file mode 100644
index 0000000..3f7538a
--- /dev/null
+++ b/store/snapshot.go
@@ -0,0 +1,16 @@
+package store
+
+import (
+	"github.com/siddontang/ledisdb/store/driver"
+)
+
+type Snapshot struct {
+	driver.ISnapshot
+}
+
+func (s *Snapshot) NewIterator() *Iterator {
+	it := new(Iterator)
+	it.it = s.ISnapshot.NewIterator()
+
+	return it
+}