- if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
- bit_depth != NULL && color_type != NULL)
- {
- png_debug1(1, "in %s retrieval function", "IHDR");
- *width = info_ptr->width;
- *height = info_ptr->height;
- *bit_depth = info_ptr->bit_depth;
- if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
- png_error(png_ptr, "Invalid bit depth");
- *color_type = info_ptr->color_type;
- if (info_ptr->color_type > 6)
- png_error(png_ptr, "Invalid color type");
- if (compression_type != NULL)
- *compression_type = info_ptr->compression_type;
- if (filter_type != NULL)
- *filter_type = info_ptr->filter_type;
- if (interlace_type != NULL)
- *interlace_type = info_ptr->interlace_type;
-
- /* check for potential overflow of rowbytes */
- if (*width == 0 || *width > PNG_UINT_31_MAX)
- png_error(png_ptr, "Invalid image width");
- if (*height == 0 || *height > PNG_UINT_31_MAX)
- png_error(png_ptr, "Invalid image height");
- if (info_ptr->width > (PNG_UINT_32_MAX
- >> 3) /* 8-byte RGBA pixels */
- - 64 /* bigrowbuf hack */
- - 1 /* filter byte */
- - 7*8 /* rounding of width to multiple of 8 pixels */
- - 8) /* extra max_pixel_depth pad */
- {
- png_warning(png_ptr,
- "Width too large for libpng to process image data.");
- }
- return (1);
- }
- return (0);
+ png_debug1(1, "in %s retrieval function", "IHDR");
+
+ if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
+ height == NULL || bit_depth == NULL || color_type == NULL)
+ return (0);
+
+ *width = info_ptr->width;
+ *height = info_ptr->height;
+ *bit_depth = info_ptr->bit_depth;
+ *color_type = info_ptr->color_type;
+
+ if (compression_type != NULL)
+ *compression_type = info_ptr->compression_type;
+
+ if (filter_type != NULL)
+ *filter_type = info_ptr->filter_type;
+
+ if (interlace_type != NULL)
+ *interlace_type = info_ptr->interlace_type;
+
+ /* This is redundant if we can be sure that the info_ptr values were all
+ * assigned in png_set_IHDR(). We do the check anyhow in case an
+ * application has ignored our advice not to mess with the members
+ * of info_ptr directly.
+ */
+ png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
+ info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
+ info_ptr->compression_type, info_ptr->filter_type);
+
+ return (1);