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#ifndef _STREAM_FUZZY_HASH_
#define _STREAM_FUZZY_HASH_
/*
* Copyright (C) MESA 2015
*
*/
#include <stdint.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
#define TOTAL_LENGTH 0
#define EFFECTIVE_LENGTH 1
#define HASH_LENGTH 2
// typedef sfh_instance_t void*;
typedef struct
{
}sfh_instance_t;
/**
* create a fuzzy hash handle and return it.
* @return [handle]
*/
sfh_instance_t * SFH_instance(unsigned long long origin_len);
/**
* destroy context by a fuzzy hash handle.
* @param handle [handle]
*/
void SFH_release(sfh_instance_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 SFH_feed(sfh_instance_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 SFH_digest(sfh_instance_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 SFH_status(sfh_instance_t * handle, int type);
#ifdef __cplusplus
}
#endif
#endif
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