增加新的table_type：文件摘要，根据摘要识别大体积文件。

src/inc_internal/mesa_fuzzy.h

@@ -0,0 +1,84 @@
+#ifndef _MESA_FUZZY_
+#define _MESA_FUZZY_
+
+/*
+ * Copyright (C) MESA 2015
+ *
+ * These functions allow a programmer to compute the fuzzy hashes
+ * (also called the context-triggered piecewise hashes) of
+ * buffer[s] of text.
+ *
+ * See also:
+ * ssdeep, and
+ * Identifying almost identical files using context triggered piecewise hashing
+ *
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define TOTAL_LENGTH     0
+#define EFFECTIVE_LENGTH 1
+#define HASH_LENGTH      2
+
+// typedef fuzzy_handle_t void*;
+typedef struct
+{
+}fuzzy_handle_t;
+
+/**
+ * create a fuzzy hash handle and return it.
+ * @return        [handle]
+ */
+fuzzy_handle_t * fuzzy_create_handle(void);
+
+/**
+ * destroy context by a fuzzy hash handle.
+ * @param handle  [handle]
+ */
+void fuzzy_destroy_handle(fuzzy_handle_t * handle);
+
+/**
+ * Feed the function your data.
+ * Call this function several times, if you have several parts of data to feed.
+ * @param  handle [handle]
+ * @param  data   [data that you want to fuzzy_hash]
+ * @param  size   [data size]
+ * @param  offset [offset]
+ * @return        [return effective data length]
+ */
+uint fuzzy_feed(fuzzy_handle_t * handle, const char* data, uint size, unsigned long offset);
+
+/**
+ * Obtain the fuzzy hash values.
+ * @param  handle  [handle]
+ * @param  result  [fuzzy hash result]
+ *     Fuzzy hash result with offsets(in the square brackets, with colon splitted).
+ *     eg. abc[1:100]def[200:300]
+ * @param  size    [@result size]
+ * @return         [return zero on success, non-zero on error]
+ */
+int fuzzy_digest(fuzzy_handle_t * handle, char* result, uint size);
+
+/**
+ * Obtain certain length of fuzzy hash status.
+ * @param  handle [handle]
+ * @param  type   [length type]
+     * TOTAL_LENGTH:Total length of data you have fed.
+     *     Overlapped data will NOT count for 2 times.
+     * EFFECTIVE_LENGTH:Length of data that involved in the calculation of hash.
+     * HASH_LENGTH:Hash result length.
+ * @return        [length value]
+ */
+unsigned long fuzzy_status(fuzzy_handle_t * handle, int type);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif