ZopFli ZLIB mode sets the wrong fLevel byte in ZLIB header

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Run zopfli -zlib
2. Examine second byte of output
3. It's 01, indicating minimal compression

What is the expected output? What do you see instead?

Expect that maximal compression value is shown.

zlibcontainer.c line 56 is:

  unsigned flevel = 0;

should be:

   unsigned flevel = 3;

https://www.ietf.org/rfc/rfc1950.txt

FLEVEL (Compression level)
These flags are available for use by specific compression
methods.  The "deflate" method (CM = 8) sets these flags as
follows:

   0 - compressor used fastest algorithm
   1 - compressor used fast algorithm
   2 - compressor used default algorithm
   3 - compressor used maximum compression, slowest algorithm

Original issue reported on code.google.com by bay...@gmail.com on 13 Oct 2014 at 2:54

[lvandeve]

Fixed :)

[ghost]

zopflipng/lodepng/lodepng.cpp also uses flevel 0.

[lvandeve]

Good point, thanks. Reopened