app-editors/xemacs/files/xemacs-21.4.22-large-images.patch

PATCH 21.4

Here is the 21.4 version of the previous patch.  The lisp.h hunk is a
little ugly.  Recommendations on how to deal with the absence of
UINT_64_T in 21.4 are welcome.

Index: src/glyphs-eimage.c
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/src/glyphs-eimage.c,v
retrieving revision 1.9.2.5
diff -d -u -r1.9.2.5 glyphs-eimage.c
--- src/glyphs-eimage.c	2007/08/20 19:52:28	1.9.2.5
+++ src/glyphs-eimage.c	2009/07/01 22:36:04
@@ -407,6 +407,7 @@
    */

   {
+    UINT_64_BIT pixels_sq;
     int jpeg_gray = 0;		/* if we're dealing with a grayscale */
     /* Step 4: set parameters for decompression.   */

@@ -429,7 +430,10 @@
     jpeg_start_decompress (&cinfo);

     /* Step 6: Read in the data and put into EImage format (8bit RGB triples)*/
-
+    pixels_sq =
+      (UINT_64_BIT) cinfo.output_width * (UINT_64_BIT) cinfo.output_height;
+    if (pixels_sq > ((size_t) -1) / 3)
+      signal_image_error ("JPEG image too large to instantiate", instantiator);
     unwind.eimage = (unsigned char*) xmalloc (cinfo.output_width * cinfo.output_height * 3);
     if (!unwind.eimage)
       signal_image_error("Unable to allocate enough memory for image", instantiator);
@@ -671,6 +675,7 @@
   {
     ColorMapObject *cmo = unwind.giffile->SColorMap;
     int i, j, row, pass, interlace, slice;
+    UINT_64_BIT pixels_sq;
     unsigned char *eip;
     /* interlaced gifs have rows in this order:
        0, 8, 16, ..., 4, 12, 20, ..., 2, 6, 10, ..., 1, 3, 5, ...  */
@@ -679,6 +684,9 @@

     height = unwind.giffile->SHeight;
     width = unwind.giffile->SWidth;
+    pixels_sq = (UINT_64_BIT) width * (UINT_64_BIT) height;
+    if (pixels_sq > ((size_t) -1) / (3 * unwind.giffile->ImageCount))
+      signal_image_error ("GIF image too large to instantiate", instantiator);
     unwind.eimage = (unsigned char*)
       xmalloc (width * height * 3 * unwind.giffile->ImageCount);
     if (!unwind.eimage)
@@ -937,11 +945,15 @@
   {
     int y;
     unsigned char **row_pointers;
+    UINT_64_BIT pixels_sq;
     height = info_ptr->height;
     width = info_ptr->width;
+    pixels_sq = (UINT_64_BIT) width * (UINT_64_BIT) height;
+    if (pixels_sq > ((size_t) -1) / 3)
+      signal_image_error ("PNG image too large to instantiate", instantiator);

     /* Wow, allocate all the memory.  Truly, exciting. */
-    unwind.eimage = xnew_array_and_zero (unsigned char, width * height * 3);
+    unwind.eimage = xnew_array_and_zero (unsigned char, pixels_sq * 3);
     /* libpng expects that the image buffer passed in contains a
        picture to draw on top of if the png has any transparencies.
        This could be a good place to pass that in... */
@@ -994,7 +1006,7 @@
       png_set_expand (png_ptr);
     /* send grayscale images to RGB too */
     if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY ||
-        info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+	info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
       png_set_gray_to_rgb (png_ptr);
     /* we can't handle alpha values */
     if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
@@ -1268,6 +1280,7 @@

     uint32 *raster;
     unsigned char *ep;
+    UINT_64_BIT pixels_sq;

     assert (!NILP (data));

@@ -1290,12 +1303,15 @@

     TIFFGetField (unwind.tiff, TIFFTAG_IMAGEWIDTH, &width);
     TIFFGetField (unwind.tiff, TIFFTAG_IMAGELENGTH, &height);
-    unwind.eimage = (unsigned char *) xmalloc (width * height * 3);
+    pixels_sq = (UINT_64_BIT) width * (UINT_64_BIT) height;
+    if (pixels_sq >= 1 << 29)
+      signal_image_error ("TIFF image too large to instantiate", instantiator);
+    unwind.eimage = (unsigned char *) xmalloc (pixels_sq * 3);

     /* #### This is little more than proof-of-concept/function testing.
        It needs to be reimplemented via scanline reads for both memory
        compactness. */
-    raster = (uint32*) _TIFFmalloc (width * height * sizeof (uint32));
+    raster = (uint32*) _TIFFmalloc ((tsize_t) (pixels_sq * sizeof (uint32)));
     if (raster != NULL)
       {
 	int i,j;
Index: src/lisp.h
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/src/lisp.h,v
retrieving revision 1.45.2.10
diff -d -u -r1.45.2.10 lisp.h
--- src/lisp.h	2005/02/01 03:55:02	1.45.2.10
+++ src/lisp.h	2009/07/01 22:36:05
@@ -265,6 +265,11 @@
 /*#define REGISTER register*/
 /*#endif*/

+#if SIZEOF_LONG == 8
+#define UINT_64_BIT unsigned long
+#elif SIZEOF_LONG_LONG == 8
+#define UINT_64_BIT unsigned long long
+#endif

 /* EMACS_INT is the underlying integral type into which a Lisp_Object must fit.
    In particular, it must be large enough to contain a pointer.