diff options
Diffstat (limited to 'lib/libz/deflate.h')
| -rw-r--r-- | lib/libz/deflate.h | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/lib/libz/deflate.h b/lib/libz/deflate.h index fc66a6ffb88..eb28c625ab2 100644 --- a/lib/libz/deflate.h +++ b/lib/libz/deflate.h @@ -21,6 +21,10 @@ # define GZIP #endif +/* define LIT_MEM to slightly increase the speed of deflate (order 1% to 2%) at + the cost of a larger memory footprint */ +/* #define LIT_MEM */ + /* =========================================================================== * Internal compression state. */ @@ -215,7 +219,12 @@ typedef struct internal_state { /* Depth of each subtree used as tie breaker for trees of equal frequency */ +#ifdef LIT_MEM + ushf *d_buf; /* buffer for distances */ + uchf *l_buf; /* buffer for literals/lengths */ +#else uchf *sym_buf; /* buffer for distances and literals/lengths */ +#endif uInt lit_bufsize; /* Size of match buffer for literals/lengths. There are 4 reasons for @@ -237,7 +246,7 @@ typedef struct internal_state { * - I can't count above 4 */ - uInt sym_next; /* running index in sym_buf */ + uInt sym_next; /* running index in symbol buffer */ uInt sym_end; /* symbol table full when sym_next reaches this */ ulg opt_len; /* bit length of current block with optimal trees */ @@ -316,6 +325,25 @@ void ZLIB_INTERNAL _tr_stored_block(deflate_state *s, charf *buf, extern const uch ZLIB_INTERNAL _dist_code[]; #endif +#ifdef LIT_MEM +# define _tr_tally_lit(s, c, flush) \ + { uch cc = (c); \ + s->d_buf[s->sym_next] = 0; \ + s->l_buf[s->sym_next++] = cc; \ + s->dyn_ltree[cc].Freq++; \ + flush = (s->sym_next == s->sym_end); \ + } +# define _tr_tally_dist(s, distance, length, flush) \ + { uch len = (uch)(length); \ + ush dist = (ush)(distance); \ + s->d_buf[s->sym_next] = dist; \ + s->l_buf[s->sym_next++] = len; \ + dist--; \ + s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \ + s->dyn_dtree[d_code(dist)].Freq++; \ + flush = (s->sym_next == s->sym_end); \ + } +#else # define _tr_tally_lit(s, c, flush) \ { uch cc = (c); \ s->sym_buf[s->sym_next++] = 0; \ @@ -335,6 +363,7 @@ void ZLIB_INTERNAL _tr_stored_block(deflate_state *s, charf *buf, s->dyn_dtree[d_code(dist)].Freq++; \ flush = (s->sym_next == s->sym_end); \ } +#endif #else # define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c) # define _tr_tally_dist(s, distance, length, flush) \ |