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Avoid allocating an extra copy of the image by using a

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* io-tiff.c (tiff_image_parse): Avoid allocating an extra copy of
	the image by using a TIFFRGBAImage{Begin,Get,End} with suitable
	put functions instead of TIFFRGBAImage. And check image dimensions
	for overflow.
This commit is contained in:
Matthias Clasen 2002-04-05 21:02:07 +00:00
parent e313199b98
commit 41446c99be
2 changed files with 93 additions and 50 deletions
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7
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,10 @@
2002-04-05 Matthias Clasen <maclas@gmx.de>
* io-tiff.c (tiff_image_parse): Avoid allocating an extra copy of
the image by using a TIFFRGBAImage{Begin,Get,End} with suitable
put functions instead of TIFFRGBAImage. And check image dimensions
for overflow.
2002-04-03 Matthias Clasen <maclas@gmx.de>
* gdk-pixbuf-loader.c (gdk_pixbuf_loader_get_type): Fix a doc typo.

136
gdk-pixbuf/io-tiff.c
View File

@ -133,36 +133,69 @@ tiff_set_error (GError **error,
static void free_buffer (guchar *pixels, gpointer data)
{
g_free (pixels);
}
static tileContigRoutine tiff_put_contig;
static tileSeparateRoutine tiff_put_separate;
/* We're lucky that TIFFRGBAImage uses the same RGBA packing
as gdk-pixbuf, thus we can simple reuse the default libtiff
put routines, only adjusting the coordinate system.
*/
static void
put_contig (TIFFRGBAImage *img, uint32 *raster,
uint32 x, uint32 y, uint32 w, uint32 h,
int32 fromskew, int32 toskew, unsigned char *cp)
{
uint32 *data = raster - y * img->width - x;
tiff_put_contig (img, data + img->width * (img->height - 1 - y) + x,
x, y, w, h, fromskew, -toskew - 2*(int32)w, cp);
}
static void
put_separate (TIFFRGBAImage *img, uint32 *raster,
uint32 x, uint32 y, uint32 w, uint32 h,
int32 fromskew, int32 toskew,
unsigned char* r, unsigned char* g, unsigned char* b, unsigned char* a)
{
uint32 *data = raster - y * img->width - x;
tiff_put_separate (img, data + img->width * (img->height - 1 - y) + x,
x, y, w, h, fromskew, -toskew - 2*w, r, g, b, a);
}
static GdkPixbuf *
tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error)
{
guchar *pixels = NULL;
guchar *tmppix;
uint32 *rast, *tmp_rast;
gint w, h, x, y, num_pixs;
gint width, height, rowstride, bytes;
GdkPixbuf *pixbuf;
TIFFRGBAImage img;
gchar emsg[1024];
/* We're called with the lock held. */
g_return_val_if_fail (global_error == NULL, NULL);
if (!TIFFGetField (tiff, TIFFTAG_IMAGEWIDTH, &w) || global_error) {
if (!TIFFGetField (tiff, TIFFTAG_IMAGEWIDTH, &width) || global_error) {
tiff_set_error (error,
GDK_PIXBUF_ERROR_FAILED,
_("Could not get image width (bad TIFF file)"));
return NULL;
}
if (!TIFFGetField (tiff, TIFFTAG_IMAGELENGTH, &h) || global_error) {
if (!TIFFGetField (tiff, TIFFTAG_IMAGELENGTH, &height) || global_error) {
tiff_set_error (error,
GDK_PIXBUF_ERROR_FAILED,
_("Could not get image height (bad TIFF file)"));
return NULL;
}
num_pixs = w * h;
if (num_pixs == 0) {
if (width <= 0 || height <= 0) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
@ -170,8 +203,27 @@ tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error)
return NULL;
}
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, w, h);
if (!pixbuf) {
rowstride = width * 4;
if (rowstride / 4 != width) { /* overflow */
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Dimensions of TIFF image too large"));
return NULL;
}
bytes = height * rowstride;
if (bytes / rowstride != height) { /* overflow */
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Dimensions of TIFF image too large"));
return NULL;
}
pixels = g_try_malloc (bytes);
if (!pixels) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
@ -179,62 +231,46 @@ tiff_image_parse (TIFF *tiff, TiffContext *context, GError **error)
return NULL;
}
pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8,
width, height, rowstride,
free_buffer, NULL);
if (!pixbuf) {
g_free (pixels);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to open TIFF file"));
return NULL;
}
G_UNLOCK (tiff_loader);
if (context)
(* context->prepare_func) (pixbuf, NULL, context->user_data);
G_LOCK (tiff_loader);
/* Yes, it needs to be _TIFFMalloc... */
rast = (uint32 *) _TIFFmalloc (num_pixs * sizeof (uint32));
if (!rast) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to open TIFF file"));
g_object_unref (pixbuf);
return NULL;
}
if (!TIFFReadRGBAImage (tiff, w, h, rast, 1) || global_error) {
if (!TIFFRGBAImageBegin (&img, tiff, 1, emsg) || global_error) {
tiff_set_error (error,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load RGB data from TIFF file"));
g_object_unref (pixbuf);
_TIFFfree (rast);
return NULL;
}
pixels = gdk_pixbuf_get_pixels (pixbuf);
g_assert (pixels);
tmppix = pixels;
for (y = 0; y < h; y++) {
/* Unexplainable...are tiffs backwards? */
/* Also looking at the GIMP plugin, this
* whole reading thing can be a bit more
* robust.
*/
tmp_rast = rast + ((h - y - 1) * w);
for (x = 0; x < w; x++) {
tmppix[0] = TIFFGetR (*tmp_rast);
tmppix[1] = TIFFGetG (*tmp_rast);
tmppix[2] = TIFFGetB (*tmp_rast);
tmppix[3] = TIFFGetA (*tmp_rast);
tmp_rast++;
tmppix += 4;
}
if (img.isContig) {
tiff_put_contig = img.put.contig;
img.put.contig = put_contig;
}
else {
tiff_put_separate = img.put.separate;
img.put.separate = put_separate;
}
_TIFFfree (rast);
TIFFRGBAImageGet (&img, (uint32 *)pixels, width, height);
TIFFRGBAImageEnd (&img);
G_UNLOCK (tiff_loader);
if (context)
(* context->update_func) (pixbuf, 0, 0, w, h, context->user_data);
(* context->update_func) (pixbuf, 0, 0, width, height, context->user_data);
G_LOCK (tiff_loader);
return pixbuf;