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-rw-r--r--backend/tiff/tiff-document.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/backend/tiff/tiff-document.c b/backend/tiff/tiff-document.c
index 854051de..52c35d6e 100644
--- a/backend/tiff/tiff-document.c
+++ b/backend/tiff/tiff-document.c
@@ -231,16 +231,19 @@ tiff_document_render (EvDocument *document,
push_handlers ();
if (TIFFSetDirectory (tiff_document->tiff, rc->page->index) != 1) {
pop_handlers ();
+ g_warning("Failed to select page %d", rc->page->index);
return NULL;
}
if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) {
pop_handlers ();
+ g_warning("Failed to read image width");
return NULL;
}
if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) {
pop_handlers ();
+ g_warning("Failed to read image height");
return NULL;
}
@@ -253,26 +256,34 @@ tiff_document_render (EvDocument *document,
pop_handlers ();
/* Sanity check the doc */
- if (width <= 0 || height <= 0)
- return NULL;
+ if (width <= 0 || height <= 0) {
+ g_warning("Invalid width or height.");
+ return NULL;
+ }
#ifdef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
rowstride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
#else
rowstride = width * 4;
#endif
- if (rowstride / 4 != width)
+ if (rowstride / 4 != width) {
+ g_warning("Overflow while rendering document.");
/* overflow, or cairo was changed in an unsupported way */
return NULL;
+ }
bytes = height * rowstride;
- if (bytes / rowstride != height)
+ if (bytes / rowstride != height) {
+ g_warning("Overflow while rendering document.");
/* overflow */
- return NULL;
+ return NULL;
+ }
pixels = g_try_malloc (bytes);
- if (!pixels)
+ if (!pixels) {
+ g_warning("Failed to allocate memory for rendering.");
return NULL;
+ }
surface = cairo_image_surface_create_for_data (pixels,
CAIRO_FORMAT_RGB24,