File ghostscript-8.64-bitcmyk-blank-output.patch of Package ghostscript-library

#! /bin/sh /usr/share/dpatch/dpatch-run
## 35_bitcmyk-blank-output.dpatch by  <till.kamppeter@gmail.com>
##
## All lines beginning with `## DP:' are a description of the patch.
## DP: No description.

@DPATCH@
diff -urNad ghostscript-8.64.dfsg.1~/base/gdevbit.c ghostscript-8.64.dfsg.1/base/gdevbit.c
--- ghostscript-8.64.dfsg.1~/base/gdevbit.c	2008-08-21 01:58:43.000000000 +0200
+++ ghostscript-8.64.dfsg.1/base/gdevbit.c	2009-02-18 19:50:13.000000000 +0100
@@ -11,7 +11,7 @@
    San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
 */
 
-/* $Id: gdevbit.c 9007 2008-08-20 23:58:43Z giles $ */
+/* $Id: gdevbit.c 9470 2009-02-11 20:35:13Z henrys $ */
 /* "Plain bits" devices to measure rendering time. */
 
 #include "gdevprn.h"
@@ -653,7 +653,7 @@
 		     pdev->color_info.depth == 32 ? cmyk_8bit_map_cmyk_color :
 		     bit_map_cmyk_color);
     }
-    /* Reset the sparable and linear shift, masks, bits. */
+    /* Reset the separable and linear shift, masks, bits. */
     set_linear_color_bits_mask_shift(pdev);
     pdev->color_info.separable_and_linear = GX_CINFO_SEP_LIN;
     ((gx_device_bit *)pdev)->FirstLine = FirstLine;
@@ -671,16 +671,18 @@
     byte *in = gs_alloc_bytes(pdev->memory, line_size, "bit_print_page(in)");
     byte *data;
     int nul = !strcmp(pdev->fname, "nul") || !strcmp(pdev->fname, "/dev/null");
-    int lnum = ((gx_device_bit *)pdev)->FirstLine;
-    int bottom = ((gx_device_bit *)pdev)->LastLine;
+    int lnum = ((gx_device_bit *)pdev)->FirstLine >= pdev->height ?  pdev->height - 1 :
+		 ((gx_device_bit *)pdev)->FirstLine;
+    int bottom = ((gx_device_bit *)pdev)->LastLine >= pdev->height ?  pdev->height - 1 :
+		 ((gx_device_bit *)pdev)->LastLine;
     int line_count = any_abs(bottom - lnum);
     int i, step = lnum > bottom ? -1 : 1;
 
     if (in == 0)
 	return_error(gs_error_VMerror);
     if ((lnum == 0) && (bottom == 0))
-	bottom = pdev->height - 1;
-    for (i = 0; i < line_count; i++, lnum += step) {
+	line_count = pdev->height - 1;		/* default when LastLine == 0, FirstLine == 0 */
+    for (i = 0; i <= line_count; i++, lnum += step) {
 	gdev_prn_get_bits(pdev, lnum, in, &data);
 	if (!nul)
 	    fwrite(data, 1, line_size, prn_stream);