mirror of
https://github.com/EQEmu/Server.git
synced 2025-12-13 06:21:28 +00:00
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* insert_string_acle.c -- insert_string variant using ACLE's CRC instructions
|
|
*
|
|
* Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*
|
|
*/
|
|
|
|
#if defined(__ARM_FEATURE_CRC32) && defined(ARM_ACLE_CRC_HASH)
|
|
#include <arm_acle.h>
|
|
#include "zbuild.h"
|
|
#include "deflate.h"
|
|
|
|
/* ===========================================================================
|
|
* Insert string str in the dictionary and set match_head to the previous head
|
|
* of the hash chain (the most recent string with same hash key). Return
|
|
* the previous length of the hash chain.
|
|
* IN assertion: all calls to to INSERT_STRING are made with consecutive
|
|
* input characters and the first MIN_MATCH bytes of str are valid
|
|
* (except for the last MIN_MATCH-1 bytes of the input file).
|
|
*/
|
|
Pos insert_string_acle(deflate_state *const s, const Pos str, unsigned int count) {
|
|
Pos p, lp, ret;
|
|
|
|
if (unlikely(count == 0)) {
|
|
return s->prev[str & s->w_mask];
|
|
}
|
|
|
|
ret = 0;
|
|
lp = str + count - 1; /* last position */
|
|
|
|
for (p = str; p <= lp; p++) {
|
|
uint32_t val, h, hm;
|
|
memcpy(&val, &s->window[p], sizeof(val));
|
|
|
|
if (s->level >= TRIGGER_LEVEL)
|
|
val &= 0xFFFFFF;
|
|
|
|
h = __crc32w(0, val);
|
|
hm = h & s->hash_mask;
|
|
|
|
Pos head = s->head[hm];
|
|
if (head != p) {
|
|
s->prev[p & s->w_mask] = head;
|
|
s->head[hm] = p;
|
|
if (p == lp)
|
|
ret = head;
|
|
} else if (p == lp) {
|
|
ret = p;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
#endif
|