/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <draw.h>#include <memdraw.h> voidusage(void){	fprint(2, "usage: iconv [-u] [-c chanstr] [file]\n");	exits("usage");} voidwriteuncompressed(int fd, Memimage *m){	char chanstr[32];	int bpl, y, j;	uchar *buf; 	if(chantostr(chanstr, m->chan) == nil)		sysfatal("can't convert channel descriptor: %r");	fprint(fd, "%11s %11d %11d %11d %11d ",		chanstr, m->r.min.x, m->r.min.y, m->r.max.x, m->r.max.y); 	bpl = bytesperline(m->r, m->depth);	buf = malloc(bpl);	if(buf == nil)		sysfatal("malloc failed: %r");	for(y=m->r.min.y; y<m->r.max.y; y++){		j = unloadmemimage(m, Rect(m->r.min.x, y, m->r.max.x, y+1), buf, bpl);		if(j != bpl)			sysfatal("image unload failed: %r");		if(write(fd, buf, bpl) != bpl)			sysfatal("write failed: %r");	}	free(buf);} voidmain(int argc, char *argv[]){	char *tostr, *file;	int fd, uncompressed;	ulong tochan;	Memimage *m, *n; 	tostr = nil;	uncompressed = 0;	ARGBEGIN{	case 'c':		tostr = EARGF(usage());		break;	case 'u':		uncompressed = 1;		break;	default:		usage();	}ARGEND 	memimageinit(); 	file = "<stdin>";	m = nil; 	switch(argc){	case 0:		m = readmemimage(0);		break;	case 1:		file = argv[0];		fd = open(file, OREAD);		if(fd < 0)			sysfatal("can't open %s: %r", file);		m = readmemimage(fd);		close(fd);		break;	default:		usage();	} 	if(m == nil)		sysfatal("can't read %s: %r", file); 	if(tostr == nil)		tochan = m->chan;	else{		tochan = strtochan(tostr);		if(tochan == 0)			sysfatal("bad channel descriptor '%s'", tostr);	} 	n = allocmemimage(m->r, tochan);	if(n == nil)		sysfatal("can't allocate new image: %r"); 	memimagedraw(n, n->r, m, m->r.min, nil, ZP, S);	if(uncompressed)		writeuncompressed(1, n);	else		writememimage(1, n);	exits(nil);}