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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <ctype.h>
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#include <bio.h>
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#include <flate.h>
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#include "imagefile.h"
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void
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usage(void)
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{
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	fprint(2, "usage: topng [-c 'comment'] [-g 'gamma'] [file]\n");
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	exits("usage");
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}
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void
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main(int argc, char *argv[])
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{
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	Biobuf bout;
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	Memimage *i;
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	int fd;
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	char *err, *filename;
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	ImageInfo II;
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	ARGBEGIN{
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	case 'c':
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		II.comment = ARGF();
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		if(II.comment == nil)
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			usage();
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		II.fields_set |= II_COMMENT;
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		break;
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	case 'g':
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		II.gamma = atof(ARGF());
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		if(II.gamma == 0.)
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			usage();
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		II.fields_set |= II_GAMMA;
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		break;
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	case 't':
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		break;
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	default:
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		usage();
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	}ARGEND
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	if(Binit(&bout, 1, OWRITE) < 0)
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		sysfatal("Binit failed: %r");
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	memimageinit();
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	if(argc == 0){
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		fd = 0;
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		filename = "<stdin>";
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	}else{
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		fd = open(argv[0], OREAD);
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		if(fd < 0)
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			sysfatal("can't open %s: %r", argv[0]);
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		filename = argv[0];
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	}
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	i = readmemimage(fd);
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	if(i == nil)
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		sysfatal("can't readimage %s: %r", filename);
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	close(fd);
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	err = memwritepng(&bout, i, &II);
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	freememimage(i);
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	if(err != nil)
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		fprint(2, "topng: %s\n", err);
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	exits(err);
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}