pnm2png / png2pnm --- conversion from PBM/PGM/PPM-file to PNG-file copyright (C) 1999-2019 by Willem van Schaik version 1.0 - 1999.10.15 - First version. 1.1 - 2015.07.29 - Fix memory leaks (Glenn Randers-Pehrson) 1.2 - 2017.04.22 - Add buffer-size check 1.3 - 2017.08.24 - Fix potential overflow in buffer-size check (Glenn Randers-Pehrson) 1.4 - 2017.08.28 - Add PNGMINUS_UNUSED (Christian Hesse) 1.5 - 2018.08.05 - Fix buffer overflow in tokenizer (Cosmin Truta) 1.6 - 2018.08.05 - Improve portability and fix style (Cosmin Truta) 1.7 - 2019.01.22 - Change license to MIT (Willem van Schaik) 1.8 - 2024.01.09 - Fix, improve, modernize (Cosmin Truta)