lisp/gnus/shr.el: Support <img src="data:...">

2 files changed, 24 insertions, 0 deletions

diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index cc7897accb6..f6cc590b026 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -1,3 +1,10 @@
+2013-04-16  David Edmondson  <dme@dme.org>
+
+        Support <img src="data:...">.
+
+        * shr.el (shr-image-from-data): New function.
+        (shr-tag-img) Use it.
+
 2013-04-14  Andrew Cohen  <cohen@bu.edu>
 
         * nnir.el (nnir-request-set-mark): Make sure we are in the right
diff --git a/lisp/gnus/shr.el b/lisp/gnus/shr.el
index 5df5297ba8a..293ba2445e9 100644
--- a/lisp/gnus/shr.el
+++ b/lisp/gnus/shr.el
@@ -593,6 +593,17 @@ size, and full-buffer size."
                       (put-text-property start (point) type value))))))))))
     (kill-buffer image-buffer)))
 
+(defun shr-image-from-data (data)
+  "Return an image from the data: URI content DATA."
+  (when (string-match
+         "\\(\\([^/;,]+\\(/[^;,]+\\)?\\)\\(;[^;,]+\\)*\\)?,\\(.*\\)"
+         data)
+    (let ((param (match-string 4 data))
+          (payload (url-unhex-string (match-string 5 data))))
+      (when (string-match "^.*\\(;[ \t]*base64\\)$" param)
+        (setq payload (base64-decode-string payload)))
+      payload)))
+
 (defun shr-put-image (data alt &optional flags)
   "Put image DATA with a string ALT.  Return image."
   (if (display-graphic-p)
@@ -983,6 +994,12 @@ ones, in case fg and bg are nil."
           ;; Ignore zero-sized or single-pixel images.
           )
          ((and (not shr-inhibit-images)
+               (string-match "\\`data:" url))
+          (let ((image (shr-image-from-data (substring url (match-end 0)))))
+            (if image
+                (funcall shr-put-image-function image alt)
+              (insert alt))))
+         ((and (not shr-inhibit-images)
                (string-match "\\`cid:" url))
           (let ((url (substring url (match-end 0)))
                 image)