VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/zlib/deflate.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/Common/zlib/deflate.h')
-rw-r--r--src/Common/zlib/deflate.h35
1 files changed, 33 insertions, 2 deletions
diff --git a/src/Common/zlib/deflate.h b/src/Common/zlib/deflate.h
index 86967914..300c6ada 100644
--- a/src/Common/zlib/deflate.h
+++ b/src/Common/zlib/deflate.h
@@ -1,5 +1,5 @@
/* deflate.h -- internal compression state
- * Copyright (C) 1995-2018 Jean-loup Gailly
+ * Copyright (C) 1995-2024 Jean-loup Gailly
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -23,6 +23,10 @@
# 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.
*/
@@ -217,7 +221,14 @@ typedef struct internal_state {
/* Depth of each subtree used as tie breaker for trees of equal frequency
*/
+#ifdef LIT_MEM
+# define LIT_BUFS 5
+ ushf *d_buf; /* buffer for distances */
+ uchf *l_buf; /* buffer for literals/lengths */
+#else
+# define LIT_BUFS 4
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
@@ -239,7 +250,7 @@ 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 */
@@ -318,6 +329,25 @@ 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; \
@@ -337,6 +367,7 @@ 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) \