coap_hashkey.h

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/*
 * coap_hashkey.h -- definition of hash key type and helper functions
 *
 * Copyright (C) 2010-2011 Olaf Bergmann <bergmann@tzi.org>
 *
 * This file is part of the CoAP library libcoap. Please see README for terms
 * of use.
 */

#ifndef COAP_HASHKEY_H_
#define COAP_HASHKEY_H_

#include "libcoap.h"
#include "uthash.h"
#include "str.h"

typedef unsigned char coap_key_t[4];

#ifndef coap_hash

void coap_hash_impl(const unsigned char *s, unsigned int len, coap_key_t h);

#define coap_hash(String,Length,Result) \
  coap_hash_impl((String),(Length),(Result))

/* This is used to control the pre-set hash-keys for resources. */
#define COAP_DEFAULT_HASH
#else
#undef COAP_DEFAULT_HASH
#endif /* coap_hash */

#define coap_str_hash(Str,H) {               \
    assert(Str);                             \
    memset((H), 0, sizeof(coap_key_t));      \
    coap_hash((Str)->s, (Str)->length, (H)); \
  }

#endif /* COAP_HASHKEY_H_ */