Libpng 1.6.23 - June 9, 2016

This is a public release of libpng, intended for use in production codes.

Files available for download:

Source files with LF line endings (for Unix/Linux) and with a
"configure" script

  libpng-1.6.23.tar.xz (LZMA-compressed, recommended)
  libpng-1.6.23.tar.gz

Source files with CRLF line endings (for Windows), without the
"configure" script

  lpng1623.7z  (LZMA-compressed, recommended)
  lpng1623.zip

Other information:

  libpng-1.6.23-README.txt
  libpng-1.6.23-LICENSE.txt
  libpng-1.6.23-*.asc (armored detached GPG signatures)

Changes since the last public release (1.6.22):

 Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
 Fixed the progressive reader to handle empty first IDAT chunk properly
   (patch by Timothy Nikkel).  This bug was introduced in libpng-1.6.0 and
   only affected the libpng16 branch.
 Added tests in pngvalid.c to check zero-length IDAT chunks in various
   positions.  Fixed the sequential reader to handle these more robustly
   (John Bowler).
 Corrected progressive read input buffer in pngvalid.c. The previous version
   the code invariably passed just one byte at a time to libpng.  The intent
   was to pass a random number of bytes in the range 0..511.
 Moved sse2 prototype from pngpriv.h to contrib/intel/intel_sse.patch.
 Added missing ")" in pngerror.c (Matt Sarrett).
 Fixed undefined behavior in png_push_save_buffer(). Do not call
   memcpy() with a null source, even if count is zero (Leon Scroggins III).
 Fixed bad link to RFC2083 in png.5 (Nikola Forro).

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