1 files changed, 37 insertions, 0 deletions
diff --git a/pkg/xtools/ranges/rgunpack.gx b/pkg/xtools/ranges/rgunpack.gx
new file mode 100644
index 00000000..2b357ebb
--- /dev/null
+++ b/pkg/xtools/ranges/rgunpack.gx
@@ -0,0 +1,37 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<pkg/rg.h>
+
+# RG_UNPACK -- Unpack a packed array.
+#
+# There is no checking on the size of the arrays.  The points in the
+# unpacked array which are not covered by the packed array are left unchanged.
+# The packed and unpacked arrays should not be the same.
+
+procedure rg_unpack$t (rg, packed, unpacked)
+
+pointer	rg					# Ranges
+PIXEL	packed[ARB]				# Packed array
+PIXEL	unpacked[ARB]				# Unpacked array
+
+int	i, j, x1, x2, nx
+
+begin
+	if (rg == NULL)
+	    call error (0, "Range descriptor undefined")
+
+	j = 1
+	do i = 1, RG_NRGS(rg) {
+	    if (RG_X1(rg, i) < RG_X2(rg, i)) {
+		x1 = RG_X1(rg, i)
+		x2 = RG_X2(rg, i)
+	    } else {
+		x1 = RG_X2(rg, i)
+		x2 = RG_X1(rg, i)
+	    }
+
+	    nx = x2 - x1 + 1
+	    call amov$t (packed[j], unpacked[x1], nx)
+	    j = j + nx
+	}
+end