- pnm2png / png2pnm --- conversion from PBM/PGM/PPM-file to PNG-file
- copyright (C) 1999-2019 by Willem van Schaik <willem at schaik dot com>
- version 1.0 - 1999.10.15 - First version.
- 1.1 - 2015.07.29 - Fixed 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)
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