Update zlib:zwindowbits/0 type to accept 8 and -8

Commit 7e8f5a776cbfa376e03369d058a90c8dd9f217fc (importing R11B-3)
updated zlib, which had changed what values it accepts for window
bits from 9-15 to 8-15.

From deflate.c:

-        windowBits < 9 || windowBits > 15 || level < 0 || level > 9 ||
-   strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
+        windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
+        strategy < 0 || strategy > Z_FIXED) {
         return Z_STREAM_ERROR;
     }
+    if (windowBits == 8) windowBits = 9;  /* until 256-byte window bug fixed */

In inflate.c 8 was already an accepted value.

This commit updates OTP to also accept the values 8 and -8.

1 files changed, 3 insertions, 3 deletions

diff --git a/erts/doc/src/zlib.xml b/erts/doc/src/zlib.xml
index da8ccdecdf..b46baad7b5 100644
--- a/erts/doc/src/zlib.xml
+++ b/erts/doc/src/zlib.xml
@@ -99,7 +99,7 @@ list_to_binary([Compressed|Last])</pre>
     <datatype>
       <name name="zwindowbits"/>
       <desc>
-        <p>Normally in the range <c>-15..-9 | 9..15</c>.</p>
+        <p>Normally in the range <c>-15..-8 | 8..15</c>.</p>
       </desc>
     </datatype>
   </datatypes>
@@ -149,7 +149,7 @@ list_to_binary([Compressed|Last])</pre>
           currently the only supported method is <c>deflated</c>.</p>
         <p>The <c><anno>WindowBits</anno></c> parameter is the base two logarithm
           of the window size (the size of the history buffer).  It
-          should be in the range 9 through 15. Larger values
+          should be in the range 8 through 15. Larger values
           of this parameter result in better compression at the
           expense of memory usage. The default value is 15 if
           <c>deflateInit/2</c>. A negative <c><anno>WindowBits</anno></c>
@@ -288,7 +288,7 @@ list_to_binary([B1,B2])</pre>
         <p>Initialize decompression session on zlib stream.</p>
         <p>The <c><anno>WindowBits</anno></c> parameter is the base two logarithm
           of the maximum window size (the size of the history buffer).
-          It should be in the range 9 through 15.
+          It should be in the range 8 through 15.
           The default value is 15 if <c>inflateInit/1</c> is used.
           If a compressed stream with a larger window size is
           given as input, inflate() will throw the <c>data_error</c>