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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_H
#define FDR_CONFIRM_H
#include "ue2common.h"
#include "hwlm/hwlm.h"
static really_inline
u32 mul_hash_64(u64a lv, u64a andmsk, u64a mult, u32 nBits) {
return ((lv & andmsk) * mult) >> (sizeof(u64a)*8 - nBits);
}
// data structures
// TODO: fix this hard-coding
#define CONF_TYPE u64a
#define CONF_HASH_CALL mul_hash_64
/**
* \brief Flag indicating this literal doesn't need to be delivered more than
* once, used in LitInfo::flags.
*/
#define FDR_LIT_FLAG_NOREPEAT 1
/**
* \brief Structure describing a literal, linked to by FDRConfirm.
*
* This structure is followed in memory by a variable-sized string prefix, for
* strings that are longer than CONF_TYPE.
*/
struct LitInfo {
CONF_TYPE v;
CONF_TYPE msk;
hwlm_group_t groups;
u32 id; // literal ID as passed in
u8 size;
u8 flags; //!< bitfield of flags from FDR_LIT_FLAG_* above.
u8 next;
};
#define FDRC_FLAG_NO_CONFIRM 1
#define FDRC_FLAG_NOREPEAT 2
/**
* \brief FDR confirm header.
*
* This structure is followed in memory by:
*
* -# lit index mapping (array of u32)
* -# list of LitInfo structures
*/
struct FDRConfirm {
CONF_TYPE andmsk;
CONF_TYPE mult;
u32 nBits;
hwlm_group_t groups;
};
static really_inline
const u32 *getConfirmLitIndex(const struct FDRConfirm *fdrc) {
const u8 *base = (const u8 *)fdrc;
const u32 *litIndex =
(const u32 *)(base + ROUNDUP_N(sizeof(*fdrc), alignof(u32)));
assert(ISALIGNED(litIndex));
return litIndex;
}
#endif // FDR_CONFIRM_H
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