Make net::DataURL's MIME string check stricter

net/base/mime_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_BASE_MIME_UTIL_H__
 #define NET_BASE_MIME_UTIL_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 37 matching lines @@
 
 // Convenience function.
 NET_EXPORT bool IsSupportedMimeType(const std::string& mime_type);
 
 // Returns true if this the mime_type_pattern matches a given mime-type.
 // Checks for absolute matching and wildcards.  mime-types should be in
 // lower case.
 NET_EXPORT bool MatchesMimeType(const std::string& mime_type_pattern,
                                 const std::string& mime_type);
 
-// Returns true if the |type_string| is a correctly-formed mime type specifier.
-// Allows strings of the form x/y[;params], where "x" is a legal mime type name.
-// Also allows wildcard types -- "x/*", "*/*", and "*".
-NET_EXPORT bool IsMimeType(const std::string& type_string);
+// Returns true if the |type_string| is a correctly-formed mime type specifier
+// with no parameter, i.e. string that matches the following ABNF (see the
+// definition of content ABNF in RFC2045 and media-type ABNF httpbis p2
+// semantics).
+//
+//   token "/" token
+//
+// If |top_level_type| is non-NULL, sets it to parsed top-level type string.
+// If |subtype| is non-NULL, sets it to parsed subtype string.
+NET_EXPORT bool ParseMimeTypeWithoutParameter(const std::string& type_string,
+                                              std::string* top_level_type,
+                                              std::string* subtype);
+
+// Returns true if the |type_string| is a top-level type of any media type
+// registered with IANA media types registry at
+// http://www.iana.org/assignments/media-types/media-types.xhtml or an
+// experimental type (type with x- prefix).
+//
+// This method doesn't check that the input conforms to token ABNF, so if input
+// is experimental type strings, you need to check check that before using
+// this method.
+NET_EXPORT bool IsValidTopLevelMimeType(const std::string& type_string);
 
 // Returns true if and only if all codecs are supported, false otherwise.
 NET_EXPORT bool AreSupportedMediaCodecs(const std::vector<std::string>& codecs);
 
 // Parses a codec string, populating |codecs_out| with the prefix of each codec
 // in the string |codecs_in|. For example, passed "aaa.b.c,dd.eee", if
 // |strip| == true |codecs_out| will contain {"aaa", "dd"}, if |strip| == false
 // |codecs_out| will contain {"aaa.b.c", "dd.eee"}.
 // See http://www.ietf.org/rfc/rfc4281.txt.
 NET_EXPORT void ParseCodecString(const std::string& codecs,
@@ skipping 52 matching lines @@
                                            std::string* post_data);
 
 // Adds the final delimiter to a multi-part upload request.
 NET_EXPORT void AddMultipartFinalDelimiterForUpload(
     const std::string& mime_boundary,
     std::string* post_data);
 
 }  // namespace net
 
 #endif  // NET_BASE_MIME_UTIL_H__