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diff --git a/include/media-thumbnail-private.h b/include/media-thumbnail-private.h
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+/*
+ * libmedia-thumbnail
+ *
+ * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
+ *
+ * Contact: Hyunjun Ko <zzoon.ko@samsung.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+
+#ifndef _MEDIA_THUMBNAIL_PRIVATE_H_
+#define _MEDIA_THUMBNAIL_PRIVATE_H_
+
+#include "media-thumb-error.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ *	thumbnail_generate_hash_code :
+ * 	This function generates a hash code using its original path by md5 algorithm. 
+ * 	If done, the code will be returned.
+ *
+ *	@return		This function returns zero(MEDIA_THUMB_ERROR_NONE) on success, or negative value with error code.
+ *				Please refer 'media-thumb-error.h' to know the exact meaning of the error.
+ *  @param[in]				origin_path      The path of the original media
+ *  @param[out]				hash_code       The hash code generated by md5 algorithm.
+ *  @param[in]				max_length       The max length of the returned hash code.
+ *	@see		None.
+ *	@pre		None.
+ *	@post		None.
+ *	@remark		None.
+ *	@par example
+ *	@code
+
+#include <media-thumbnail.h>
+
+void gen_thumb_hash_code()
+{
+	int ret = MEDIA_THUMB_ERROR_NONE;
+	const char *origin_path = "/opt/usr/media/test.jpg";
+	char hashcode[255];
+
+	ret = thumbnail_generate_hash_code(origin_path, hashcode, 255);
+
+	if (ret < 0) {
+		printf( "thumbnail_generate_hash_code fails. error code->%d", ret);
+	}
+
+	return;
+}
+
+ * 	@endcode
+ */
+int thumbnail_generate_hash_code(const char *origin_path, char *hash_code, int max_length);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_MEDIA_THUMBNAIL_PRIVATE_H_*/
+