* ext/zlib/zlib.c (Init_zlib): Added Zlib::FIXED and Zlib::RLE

strategies.
* NEWS:  Add note about the new Zlib constants.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34614 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Wed Feb 15 09:27:45 2012  Eric Hodel  <drbrain@segment7.net>
+
+	* ext/zlib/zlib.c (Init_zlib):  Added Zlib::FIXED and Zlib::RLE
+	  strategies.
+	* NEWS:  Add note about the new Zlib constants.
+
 Wed Feb 15 09:11:36 2012  Eric Hodel  <drbrain@segment7.net>
 
 	* ext/zlib/zlib.c:  Improve documentation.  [ruby-trunk - Bug #5948]

NEWS

@@ -62,6 +62,9 @@ with all sufficient information, see the ChangeLog file.
     * Shellwords#shelljoin() accepts non-string objects in the given
       array, each of which is stringified using to_s.
 
+* zlib
+  * Added support for the new deflate strategies Zlib::RLE and Zlib::FIXED.
+
 === Language changes
 === Compatibility issues (excluding feature bug fixes)
 

ext/zlib/zlib.c

@@ -1329,13 +1329,21 @@ rb_deflate_s_allocate(VALUE klass)
  *
  * Zlib::FILTERED::
  *   For data produced by a filter (or predictor). The effect of FILTERED is
- *   to force more Huffman coding and less string matching; it is somewhat
+ *   to force more Huffman codes and less string matching; it is somewhat
  *   intermediate between DEFAULT_STRATEGY and HUFFMAN_ONLY. Filtered data
  *   consists mostly of small values with a somewhat random distribution.
  *
+ * Zlib::FIXED::
+ *   Prevents the use of dynamic Huffman codes, allowing for a simpler decoder
+ *   for specialized applications.
+ *
  * Zlib::HUFFMAN_ONLY::
  *   Use Huffman encoding only (no string matching).
  *
+ * Zlib::RLE::
+ *   Designed to be almost as fast as HUFFMAN_ONLY, but give better
+ *   compression for PNG image data.
+ *
  * == Examples
  *
  * === Basic
@@ -4209,6 +4217,18 @@ Init_zlib()
      *
      * Which is an argument for Deflate.new and Deflate#params. */
     rb_define_const(mZlib, "HUFFMAN_ONLY", INT2FIX(Z_HUFFMAN_ONLY));
+#ifdef Z_RLE
+    /* compression method 3
+     *
+     * Which is an argument for Deflate.new and Deflate#params. */
+    rb_define_const(mZlib, "RLE", INT2FIX(Z_RLE));
+#endif
+#ifdef Z_FIXED
+    /* compression method 4
+     *
+     * Which is an argument for Deflate.new and Deflate#params. */
+    rb_define_const(mZlib, "FIXED", INT2FIX(Z_FIXED));
+#endif
     /* compression method 0
      *
      * Which is an argument for Deflate.new and Deflate#params. */