handle writing of lineart data

backend/genesys_low.c

@@ -118,8 +118,15 @@ sanei_genesys_write_pnm_file (char *filename, uint8_t * data, int depth,
 	   filename, strerror (errno));
       return SANE_STATUS_INVAL;
     }
+  if(depth==1)
+    {
+      fprintf (out, "P4\n%d\n%d\n", pixels_per_line, lines);
+    }
+  else
+    {
       fprintf (out, "P%c\n%d\n%d\n%d\n", channels == 1 ? '5' : '6',
 	   pixels_per_line, lines, (int) pow (2, depth) - 1);
+    }
   if (channels == 3)
     {
       for (count = 0; count < (pixels_per_line * lines * 3); count++)
@@ -133,17 +140,25 @@ sanei_genesys_write_pnm_file (char *filename, uint8_t * data, int depth,
     }
   else
     {
+      if (depth==1)
+        {
+          pixels_per_line/=8;
+        }
       for (count = 0; count < (pixels_per_line * lines); count++)
 	{
-	  if (depth == 8)
+          switch (depth)
             {
+              case 8:
 	        fputc (*(data + count), out);
-	    }
+                break;
-	  else
+              case 16:
-	    {
 	        fputc (*(data + 1), out);
 	        fputc (*(data), out);
 	        data += 2;
+                break;
+              default:
+                fputc(data[count], out);
+                break;
             }
 	}
     }