Merge branch 'bjorn/erts/zlib-1.2.8'

* bjorn/erts/zlib-1.2.8:
  configure: Prefer the system's zlib over own our zlib source
  Update preloaded modules
  Add the 'rle' zstrategy
  Don't make gzio.c dependent on the zutil.h header file
  Update zlib to 1.2.8
  erts/zlib: Remove unused file example.c

1 files changed, 17 insertions, 12 deletions

diff --git a/erts/emulator/zlib/inftrees.h b/erts/emulator/zlib/inftrees.h
index 808100f70a..baa53a0b1a 100644
--- a/erts/emulator/zlib/inftrees.h
+++ b/erts/emulator/zlib/inftrees.h
@@ -1,10 +1,8 @@
 /* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-2005 Mark Adler
+ * Copyright (C) 1995-2005, 2010 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
-/* %ExternalCopyright% */
-
 /* WARNING: this file should *not* be used by applications. It is
    part of the implementation of the compression library and is
    subject to change. Applications should only use zlib.h.
@@ -37,21 +35,28 @@ 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,
     DISTS
 } codetype;
 
-extern int inflate_table OF((codetype type, unsigned short FAR *lens,
+int ZLIB_INTERNAL inflate_table OF((codetype type, unsigned short FAR *lens,
                              unsigned codes, code FAR * FAR *table,
                              unsigned FAR *bits, unsigned short FAR *work));