PNG encoder and decoder in C and C++, without dependencies

 PNG is a file format to store raster images losslessly with good compression,
 supporting different color types and alpha channel.
 .
 LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
 Specification (Second Edition) - W3C Recommendation 10 November 2003.
 .
 The specifications used are:
 .
  *) Portable Network Graphics (PNG) Specification (Second Edition):
       http://www.w3.org/TR/2003/REC-PNG-20031110
  *) RFC 1950 ZLIB Compressed Data Format version 3.3:
       http://www.gzip.org/zlib/rfc-zlib.html
  *) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
       http://www.gzip.org/zlib/rfc-deflate.html
 .
 LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
 extra functionality.
 .
 This package conatains the shared objects.