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