CSS: explicitly check if URL is a data URI before minifying data URI

tdewolff · Jan 13, 2020 · 7c4fdeb · 7c4fdeb
1 parent 70870d2
commit 7c4fdeb
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/css/css.go b/css/css.go
@@ -25,6 +25,7 @@ var (
 	transparentBytes  = []byte("transparent")
 	initialBytes      = []byte("initial")
 	importantBytes    = []byte("!important")
+	dataSchemeBytes   = []byte("data:")
 )
 
 type cssMinifier struct {
@@ -522,7 +523,9 @@ func (c *cssMinifier) minifyTokens(prop Hash, values []Token) []Token {
 					uri = removeMarkupNewlines(uri)
 					uri = uri[1 : len(uri)-1]
 				}
-				uri = minify.DataURI(c.m, uri)
+				if 4 < len(uri) && parse.EqualFold(uri[:5], dataSchemeBytes) {
+					uri = minify.DataURI(c.m, uri)
+				}
 				if css.IsURLUnquoted(uri) {
 					values[i].Data = append(append([]byte("url("), uri...), ')')
 				} else {