1 files changed, 30 insertions, 0 deletions
diff --git a/sys/imfort/imswap.x b/sys/imfort/imswap.x
new file mode 100644
index 00000000..9bed0ebc
--- /dev/null
+++ b/sys/imfort/imswap.x
@@ -0,0 +1,30 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+include "imfort.h"
+
+
+# IMSWAP -- Swap bytes in pixel data if indicated for this host and image.
+
+procedure imswap (im, buf, nchars)
+
+pointer	im
+char	buf[ARB]
+int	nchars
+
+int	nbytes
+
+begin
+	if (IM_SWAP(im) == NO)
+	    return
+
+	nbytes = nchars * SZB_CHAR
+	switch (IM_SZPIXEL(im) * SZB_CHAR) {
+	case 2:
+	    call bswap2 (buf, 1, buf, 1, nbytes)
+	case 4:
+	    call bswap4 (buf, 1, buf, 1, nbytes)
+	case 8:
+	    call bswap8 (buf, 1, buf, 1, nbytes)
+	}
+end