summaryrefslogtreecommitdiffstats
path: root/compat/zlib/inftrees.h
diff options
context:
space:
mode:
Diffstat (limited to 'compat/zlib/inftrees.h')
-rw-r--r--compat/zlib/inftrees.h23
1 files changed, 15 insertions, 8 deletions
diff --git a/compat/zlib/inftrees.h b/compat/zlib/inftrees.h
index b1104c8..67461da 100644
--- a/compat/zlib/inftrees.h
+++ b/compat/zlib/inftrees.h
@@ -35,15 +35,22 @@ 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
+ 1444, which is the sum of 852 for literal/length codes and 592 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 30 6 15" for distance codes returns 592.
+ The initial root table size (9 or 6) is found in the fifth argument of the
+ inflate_table() calls in inflate.c and infback.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 592
+#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
-/* Type of code to build for inftable() */
+/* Type of code to build for inflate_table() */
typedef enum {
CODES,
LENS,