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#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(unsigned long long origin_len);
/**
* 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 in current feed]
*/
unsigned int fuzzy_feed(fuzzy_handle_t * handle, const char* data, unsigned int size, unsigned long 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, unsigned int 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 long fuzzy_status(fuzzy_handle_t * handle, int type);
#ifdef __cplusplus
}
#endif
#endif
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