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-rw-r--r--zlib/contrib/infback9/inftree9.h24
1 files changed, 15 insertions, 9 deletions
diff --git a/zlib/contrib/infback9/inftree9.h b/zlib/contrib/infback9/inftree9.h
index a268084ee..5ab21f0c6 100644
--- a/zlib/contrib/infback9/inftree9.h
+++ b/zlib/contrib/infback9/inftree9.h
@@ -1,5 +1,5 @@
/* inftree9.h -- header to use inftree9.c
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2008 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -35,15 +35,21 @@ typedef struct {
01000000 - invalid code
*/
-/* Maximum size of dynamic tree. The maximum found in a long but non-
- exhaustive search was 1444 code structures (852 for length/literals
- and 592 for distances, the latter actually the result of an
- exhaustive search). The true maximum is not known, but the value
- below is more than safe. */
-#define ENOUGH 2048
-#define MAXD 592
+/* Maximum size of the dynamic table. The maximum number of code structures is
+ 1446, which is the sum of 852 for literal/length codes and 594 for distance
+ codes. These values were found by exhaustive searches using the program
+ examples/enough.c found in the zlib distribtution. The arguments to that
+ program are the number of symbols, the initial root table size, and the
+ maximum bit length of a code. "enough 286 9 15" for literal/length codes
+ returns returns 852, and "enough 32 6 15" for distance codes returns 594.
+ The initial root table size (9 or 6) is found in the fifth argument of the
+ inflate_table() calls in infback9.c. If the root table size is changed,
+ then these maximum sizes would be need to be recalculated and updated. */
+#define ENOUGH_LENS 852
+#define ENOUGH_DISTS 594
+#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
-/* Type of code to build for inftable() */
+/* Type of code to build for inflate_table9() */
typedef enum {
CODES,
LENS,