ClickHouse/contrib/libzlib-ng/deflate_p.h

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/* deflate_p.h -- Private inline functions and macros shared with more than
* one deflate method
*
* Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*
*/
#ifndef DEFLATE_P_H
#define DEFLATE_P_H
#if defined(X86_CPUID)
# include "arch/x86/x86.h"
#endif
/* Forward declare common non-inlined functions declared in deflate.c */
#ifdef DEBUG
void check_match(deflate_state *s, IPos start, IPos match, int length);
#else
#define check_match(s, start, match, length)
#endif
void fill_window(deflate_state *s);
void flush_pending(z_stream *strm);
/* ===========================================================================
* 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).
*/
#ifdef X86_SSE4_2_CRC_HASH
extern Pos insert_string_sse(deflate_state *const s, const Pos str, uInt count);
#endif
local inline Pos insert_string_c(deflate_state *const s, const Pos str, uInt count) {
Pos ret = 0;
uInt idx;
for (idx = 0; idx < count; idx++) {
UPDATE_HASH(s, s->ins_h, str+idx);
if (s->head[s->ins_h] != str+idx) {
s->prev[(str+idx) & s->w_mask] = s->head[s->ins_h];
s->head[s->ins_h] = str+idx;
}
}
ret = s->prev[(str+count-1) & s->w_mask];
return ret;
}
local inline Pos insert_string(deflate_state *const s, const Pos str) {
#ifdef X86_SSE4_2_CRC_HASH
if (x86_cpu_has_sse42)
return insert_string_sse(s, str, 1);
#endif
return insert_string_c(s, str, 1);
}
#ifndef NOT_TWEAK_COMPILER
local inline void bulk_insert_str(deflate_state *const s, Pos startpos, uInt count) {
# ifdef X86_SSE4_2_CRC_HASH
if (x86_cpu_has_sse42) {
insert_string_sse(s, startpos, count);
} else
# endif
{
insert_string_c(s, startpos, count);
}
}
#endif /* NOT_TWEAK_COMPILER */
/* ===========================================================================
* Flush the current block, with given end-of-file flag.
* IN assertion: strstart is set to the end of the current match.
*/
#define FLUSH_BLOCK_ONLY(s, last) { \
_tr_flush_block(s, (s->block_start >= 0L ? \
(char *)&s->window[(unsigned)s->block_start] : \
(char *)Z_NULL), \
(ulg)((long)s->strstart - s->block_start), \
(last)); \
s->block_start = s->strstart; \
flush_pending(s->strm); \
Tracev((stderr, "[FLUSH]")); \
}
/* Same but force premature exit if necessary. */
#define FLUSH_BLOCK(s, last) { \
FLUSH_BLOCK_ONLY(s, last); \
if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
}
#endif