Always check for NULL when using callbacks. (#330563, Benjamin Otte)

2006-02-10  Matthias Clasen  <mclasen@redhat.com>

        * io-jpeg.c:
        * io-png.c:
        * io-pnm.c:
        * io-tiff.c:
        * io-xbm.c:
        * io-xpm.c: Always check for NULL when using callbacks.
        (#330563, Benjamin Otte)

7 files changed, 38 insertions, 22 deletions

diff --git a/gdk-pixbuf/ChangeLog b/gdk-pixbuf/ChangeLog
index e8695d446..7ee480fbf 100644
--- a/gdk-pixbuf/ChangeLog
+++ b/gdk-pixbuf/ChangeLog
@@ -1,3 +1,13 @@
+2006-02-10  Matthias Clasen  <mclasen@redhat.com>
+
+	* io-jpeg.c:
+	* io-png.c:
+	* io-pnm.c:
+	* io-tiff.c:
+	* io-xbm.c:
+	* io-xpm.c: Always check for NULL when using callbacks.
+	(#330563, Benjamin Otte)
+
 2006-01-25  Matthias Clasen  <mclasen@redhat.com>
 
 	* === Released 2.8.11 ===
diff --git a/gdk-pixbuf/io-jpeg.c b/gdk-pixbuf/io-jpeg.c
index 84376d51b..96b3453b0 100644
--- a/gdk-pixbuf/io-jpeg.c
+++ b/gdk-pixbuf/io-jpeg.c
@@ -595,12 +595,13 @@ gdk_pixbuf__jpeg_image_load_lines (JpegProgContext  *context,
                 context->dptr += nlines * context->pixbuf->rowstride;
 
                 /* send updated signal */
-                (* context->updated_func) (context->pixbuf,
-                                           0,
-                                           cinfo->output_scanline - 1,
-                                           cinfo->image_width,
-                                           nlines,
-                                           context->user_data);
+		if (context->updated_func)
+			(* context->updated_func) (context->pixbuf,
+						   0,
+						   cinfo->output_scanline - 1,
+						   cinfo->image_width,
+						   nlines,
+						   context->user_data);
         }
 
         return TRUE;
@@ -745,9 +746,10 @@ gdk_pixbuf__jpeg_image_load_increment (gpointer data,
 			context->dptr = context->pixbuf->pixels;
 			
 			/* Notify the client that we are ready to go */
-			(* context->prepared_func) (context->pixbuf,
-                                                    NULL,
-						    context->user_data);
+			if (context->prepared_func)
+				(* context->prepared_func) (context->pixbuf,
+							    NULL,
+							    context->user_data);
 			
 		} else if (!context->did_prescan) {
 			int rc;			
diff --git a/gdk-pixbuf/io-png.c b/gdk-pixbuf/io-png.c
index 25a2bb606..f4e1ba567 100644
--- a/gdk-pixbuf/io-png.c
+++ b/gdk-pixbuf/io-png.c
@@ -517,7 +517,7 @@ gdk_pixbuf__png_image_load_increment(gpointer context,
                 lc->error = NULL;
                 return FALSE;
         } else {
-                if (lc->first_row_seen_in_chunk >= 0) {
+                if (lc->first_row_seen_in_chunk >= 0 && lc->update_func) {
                         /* We saw at least one row */
                         gint pass_diff = lc->last_pass_seen_in_chunk - lc->first_pass_seen_in_chunk;
                         
diff --git a/gdk-pixbuf/io-pnm.c b/gdk-pixbuf/io-pnm.c
index 81e50a7f7..81225740a 100644
--- a/gdk-pixbuf/io-pnm.c
+++ b/gdk-pixbuf/io-pnm.c
@@ -1015,9 +1015,10 @@ gdk_pixbuf__pnm_image_load_increment (gpointer data,
 			context->rowstride = context->pixbuf->rowstride;
 			
 			/* Notify the client that we are ready to go */
-			(* context->prepared_func) (context->pixbuf,
-						    NULL,
-						    context->user_data);
+			if (context->prepared_func)
+				(* context->prepared_func) (context->pixbuf,
+							    NULL,
+							    context->user_data);
 		}
 		
 		/* if we got here we're reading image data */
@@ -1028,7 +1029,7 @@ gdk_pixbuf__pnm_image_load_increment (gpointer data,
 				break;
 			} else if (retval == PNM_FATAL_ERR) {
 				return FALSE;
-			} else if (retval == PNM_OK) {	
+			} else if (retval == PNM_OK && context->updated_func) {	
 				/* send updated signal */
 				(* context->updated_func) (context->pixbuf,
 							   0, 
diff --git a/gdk-pixbuf/io-tiff.c b/gdk-pixbuf/io-tiff.c
index e874e4d91..4e8136790 100644
--- a/gdk-pixbuf/io-tiff.c
+++ b/gdk-pixbuf/io-tiff.c
@@ -238,7 +238,7 @@ tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error)
                 return NULL;
         }
 
-	if (context)
+	if (context && context->prepare_func)
 		(* context->prepare_func) (pixbuf, NULL, context->user_data);
 
 #if TIFFLIB_VERSION >= 20031226
@@ -324,7 +324,7 @@ tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error)
                 _TIFFfree (rast);
              }
 
-	if (context)
+	if (context && context->update_func)
 		(* context->update_func) (pixbuf, 0, 0, width, height, context->user_data);
         
         return pixbuf;
diff --git a/gdk-pixbuf/io-xbm.c b/gdk-pixbuf/io-xbm.c
index 9d808703e..90d8120a1 100644
--- a/gdk-pixbuf/io-xbm.c
+++ b/gdk-pixbuf/io-xbm.c
@@ -309,7 +309,7 @@ gdk_pixbuf__xbm_image_load_real (FILE *f, XBMData *context, GError **error)
 	pixels = gdk_pixbuf_get_pixels (pixbuf);
 	row_stride = gdk_pixbuf_get_rowstride (pixbuf);
 
-	if (context)
+	if (context && context->prepare_func)
 		(* context->prepare_func) (pixbuf, NULL, context->user_data);
 
 
@@ -338,7 +338,8 @@ gdk_pixbuf__xbm_image_load_real (FILE *f, XBMData *context, GError **error)
 	g_free (data);
 
 	if (context) {
-		(* context->update_func) (pixbuf, 0, 0, w, h, context->user_data);
+		if (context->update_func)
+			(* context->update_func) (pixbuf, 0, 0, w, h, context->user_data);
 		g_object_unref (pixbuf);
 		pixbuf = NULL;
 	}
diff --git a/gdk-pixbuf/io-xpm.c b/gdk-pixbuf/io-xpm.c
index 7f020cd96..3357aab4b 100644
--- a/gdk-pixbuf/io-xpm.c
+++ b/gdk-pixbuf/io-xpm.c
@@ -738,10 +738,12 @@ gdk_pixbuf__xpm_image_stop_load (gpointer data,
                pixbuf = gdk_pixbuf__xpm_image_load (context->file, error);
 
                if (pixbuf != NULL) {
-                       (* context->prepare_func) (pixbuf,
-                                                  NULL,
-                                                  context->user_data);
-                       (* context->update_func) (pixbuf, 0, 0, pixbuf->width, pixbuf->height, context->user_data);
+		       if (context->prepare_func)
+			       (* context->prepare_func) (pixbuf,
+							  NULL,
+							  context->user_data);
+		       if (context->update_func)
+			       (* context->update_func) (pixbuf, 0, 0, pixbuf->width, pixbuf->height, context->user_data);
                        g_object_unref (pixbuf);
 
                        retval = TRUE;