diff --git a/src/lib/jpeg.c b/src/lib/jpeg.c
index a86ea06661..8d370ec67b 100644
--- a/src/lib/jpeg.c
+++ b/src/lib/jpeg.c
@@ -257,6 +257,18 @@ static int dec_checkmarker(void)
 	return 0;
 }
 
+void jpeg_fetch_size(unsigned char *buf, int *width, int *height)
+{
+	datap = buf;
+	getbyte();
+	getbyte();
+	readtables(M_SOF0);
+	getword();
+	getbyte();
+	*height = getword();
+	*width = getword();
+}
+
 int jpeg_check_size(unsigned char *buf, int width, int height)
 {
   	datap = buf;
diff --git a/src/lib/jpeg.h b/src/lib/jpeg.h
index a32e4aff8e..bdde8a4ecf 100644
--- a/src/lib/jpeg.h
+++ b/src/lib/jpeg.h
@@ -49,6 +49,7 @@ struct jpeg_decdata {
 };
 
 int jpeg_decode(unsigned char *, unsigned char *, int, int, int, struct jpeg_decdata *);
+void jpeg_fetch_size(unsigned char *buf, int *width, int *height);
 int jpeg_check_size(unsigned char *, int, int);
 
 #endif