rspamd/src/libutil/uthash_strcase.h

/*-
 * Copyright 2016 Vsevolod Stakhov
 *
 * 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 UTHASH_STRCASE_H_
#define UTHASH_STRCASE_H_

#ifdef UTHASH_H
#error Invalid include order: uthash is already included
#endif

#include "libcryptobox/cryptobox.h"
#include "libutil/util.h"

/* Utils for uthash tuning */
#ifndef HASH_CASELESS
#define HASH_FUNCTION(key, keylen, num_bkts, hashv, bkt)                                       \
	do {                                                                                       \
		hashv = (__typeof(hashv)) rspamd_cryptobox_fast_hash(key, keylen, rspamd_hash_seed()); \
		bkt = (hashv) & (num_bkts - 1);                                                        \
	} while (0)

#define HASH_KEYCMP(a, b, len) memcmp(a, b, len)
#else
#define HASH_FUNCTION(key, keylen, num_bkts, hashv, bkt)                                            \
	do {                                                                                            \
		unsigned _len = keylen;                                                                     \
		rspamd_cryptobox_fast_hash_state_t _hst;                                                    \
		unsigned _leftover = keylen % 8;                                                            \
		unsigned _fp, _i;                                                                           \
		const uint8_t *_s = (const uint8_t *) (key);                                                \
		union {                                                                                     \
			struct {                                                                                \
				unsigned char c1, c2, c3, c4, c5, c6, c7, c8;                                       \
			} c;                                                                                    \
			uint64_t pp;                                                                            \
		} _u;                                                                                       \
		_fp = _len - _leftover;                                                                     \
		rspamd_cryptobox_fast_hash_init(&_hst, rspamd_hash_seed());                                 \
		for (_i = 0; _i != _fp; _i += 8) {                                                          \
			_u.c.c1 = _s[_i], _u.c.c2 = _s[_i + 1], _u.c.c3 = _s[_i + 2], _u.c.c4 = _s[_i + 3];     \
			_u.c.c5 = _s[_i + 4], _u.c.c6 = _s[_i + 5], _u.c.c7 = _s[_i + 6], _u.c.c8 = _s[_i + 7]; \
			_u.c.c1 = lc_map[_u.c.c1];                                                              \
			_u.c.c2 = lc_map[_u.c.c2];                                                              \
			_u.c.c3 = lc_map[_u.c.c3];                                                              \
			_u.c.c4 = lc_map[_u.c.c4];                                                              \
			_u.c.c1 = lc_map[_u.c.c5];                                                              \
			_u.c.c2 = lc_map[_u.c.c6];                                                              \
			_u.c.c3 = lc_map[_u.c.c7];                                                              \
			_u.c.c4 = lc_map[_u.c.c8];                                                              \
			rspamd_cryptobox_fast_hash_update(&_hst, &_u, sizeof(_u));                              \
		}                                                                                           \
		_u.pp = 0;                                                                                  \
		switch (_leftover) {                                                                        \
		case 7:                                                                                     \
			/* fallthrough */ _u.c.c7 = lc_map[(unsigned char) _s[_i++]];                           \
		case 6:                                                                                     \
			/* fallthrough */ _u.c.c6 = lc_map[(unsigned char) _s[_i++]];                           \
		case 5:                                                                                     \
			/* fallthrough */ _u.c.c5 = lc_map[(unsigned char) _s[_i++]];                           \
		case 4:                                                                                     \
			/* fallthrough */ _u.c.c4 = lc_map[(unsigned char) _s[_i++]];                           \
		case 3:                                                                                     \
			/* fallthrough */ _u.c.c3 = lc_map[(unsigned char) _s[_i++]];                           \
		case 2:                                                                                     \
			/* fallthrough */ _u.c.c2 = lc_map[(unsigned char) _s[_i++]];                           \
		case 1:                                                                                     \
			/* fallthrough */ _u.c.c1 = lc_map[(unsigned char) _s[_i]];                             \
			rspamd_cryptobox_fast_hash_update(&_hst, &_u, sizeof(_u));                              \
			break;                                                                                  \
		}                                                                                           \
		hashv = (__typeof(hashv)) rspamd_cryptobox_fast_hash_final(&_hst);                          \
		bkt = (hashv) & (num_bkts - 1);                                                             \
	} while (0)
#define HASH_KEYCMP(a, b, len) rspamd_lc_cmp(a, b, len)
#endif

#include "uthash.h"

#endif /* UTHASH_STRCASE_H_ */