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/*
* Copyright (c) 2015-2019, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FDR_CONFIRM_RUNTIME_H
#define FDR_CONFIRM_RUNTIME_H
#include "scratch.h"
#include "fdr_internal.h"
#include "fdr_loadval.h"
#include "hwlm/hwlm.h"
#include "ue2common.h"
#include "util/bitutils.h"
#include "util/compare.h"
// this is ordinary confirmation function which runs through
// the whole confirmation procedure
static really_inline
void confWithBit(const struct FDRConfirm *fdrc, const struct FDR_Runtime_Args *a,
size_t i, hwlmcb_rv_t *control, u32 *last_match,
u64a conf_key, u64a *conf, u8 bit) {
assert(i < a->len);
assert(i >= a->start_offset);
assert(ISALIGNED(fdrc));
const u8 * buf = a->buf;
u32 c = CONF_HASH_CALL(conf_key, fdrc->andmsk, fdrc->mult,
fdrc->nBits);
u32 start = getConfirmLitIndex(fdrc)[c];
if (likely(!start)) {
return;
}
const struct LitInfo *li
= (const struct LitInfo *)((const u8 *)fdrc + start);
struct hs_scratch *scratch = a->scratch;
assert(!scratch->fdr_conf);
scratch->fdr_conf = conf;
scratch->fdr_conf_offset = bit;
u8 oldNext; // initialized in loop
do {
assert(ISALIGNED(li));
if (unlikely((conf_key & li->msk) != li->v)) {
goto out;
}
if ((*last_match == li->id) && (li->flags & FDR_LIT_FLAG_NOREPEAT)) {
goto out;
}
const u8 *loc = buf + i - li->size + 1;
if (loc < buf) {
u32 full_overhang = buf - loc;
size_t len_history = a->len_history;
// can't do a vectored confirm either if we don't have
// the bytes
if (full_overhang > len_history) {
goto out;
}
}
assert(li->size <= sizeof(CONF_TYPE));
if (unlikely(!(li->groups & *control))) {
goto out;
}
*last_match = li->id;
*control = a->cb(i, li->id, scratch);
out:
oldNext = li->next; // oldNext is either 0 or an 'adjust' value
li++;
} while (oldNext);
scratch->fdr_conf = NULL;
}
#endif
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