zlib 0.91

zconf.h

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zconf.h,v 1.10 1995/04/30 19:27:14 jloup Exp $ */
+/* $Id: zconf.h,v 1.11 1995/05/02 13:07:21 jloup Exp $ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
@@ -32,6 +32,7 @@
 #  define STDC
 #endif
 
+/* Maximum value for memLevel in deflateInit2 */
 #ifndef MAX_MEM_LEVEL
 #  ifdef MAXSEG_64K
 #    define MAX_MEM_LEVEL 8
@@ -40,10 +41,24 @@
 #  endif
 #endif
 
+/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
 #ifndef MAX_WBITS
 #  define MAX_WBITS   15 /* 32K LZ77 window */
 #endif
 
+/* The memory requirements for deflate are (in bytes):
+            1 << (windowBits+2)   +  1 << (memLevel+9)
+ that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
+ plus a few kilobytes for small objects. For example, if you want to reduce
+ the default memory requirements from 256K to 128K, compile with
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus a few kilobytes
+ for small objects.
+*/
+
 			/* Type declarations */
 
 #ifndef __P /* function prototypes */