code: plan9front

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iconv: copy extra data verbatim to allow font conversion/compression

--- a/sys/man/1/crop

+++ b/sys/man/1/crop

@@ -114,8 +114,11 @@

 .I Iconv

 changes the format of pixels in the image

 .I file

-(default standard input) and writes the resulting image to standard output.

-Pixels in the image are converted according to the channel descriptor

+(default standard input) and writes the resulting image to standard

+output.  Any extra data following the source image is copied verbatim,

+which allows converting fonts without losing subfont header and

+character information.  Pixels in the image are converted according to

+the channel descriptor

 .IR chandesc ,

 (see

 .IR image (6)).

--- a/sys/src/cmd/iconv.c

+++ b/sys/src/cmd/iconv.c

@@ -40,9 +40,10 @@

 main(int argc, char *argv[])

 {

 	char *tostr, *file;

-	int fd, uncompressed;

+	int fd, uncompressed, r;

 	ulong tochan;

 	Memimage *m, *n;

+	uchar extra[8192];

 	tostr = nil;

 	uncompressed = 0;

@@ -60,24 +61,20 @@

 	memimageinit();

 	file = "<stdin>";

-	m = nil;

-

+	fd = 0;

 	switch(argc){

 	case 0:

-		m = readmemimage(0);

 		break;

 	case 1:

-		file = argv[0];

-		fd = open(file, OREAD);

+		fd = open(file = argv[0], OREAD);

 		if(fd < 0)

 			sysfatal("can't open %s: %r", file);

-		m = readmemimage(fd);

-		close(fd);

 		break;

 	default:

 		usage();

 	}

+	m = readmemimage(fd);

 	if(m == nil)

 		sysfatal("can't read %s: %r", file);

@@ -98,5 +95,15 @@

 		writeuncompressed(1, n);

 	else

 		writememimage(1, n);

+

+	for(;;){

+		if((r = read(fd, extra, sizeof(extra))) < 0)

+			sysfatal("read failed: %r");

+		if(r == 0)

+			break;

+		if(write(1, extra, r) != r)

+			sysfatal("write failed: %r");

+	}

+

 	exits(nil);

 }