Certificate Transparency: Parse Signed Tree Heads and validate them

net/cert/ct_log_response_parser.h

Index: net/cert/ct_log_response_parser.h
diff --git a/net/cert/ct_log_response_parser.h b/net/cert/ct_log_response_parser.h
new file mode 100644
index 0000000000000000000000000000000000000000..e458670324f9c488955000e0ad8a7dabf42cd89c
--- /dev/null
+++ b/net/cert/ct_log_response_parser.h
@@ -0,0 +1,27 @@
+// Copyright 2014 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_CERT_CT_LOG_RESPONSE_PARSER_H_
+#define NET_CERT_CT_LOG_RESPONSE_PARSER_H_
+
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+namespace ct {
+struct SignedTreeHead;
+
+// Fills in |signed_tree_head| from its JSON representation in
+// |json_signed_tree_head|.
+// Returns true and fills in |signed_tree_head| if all fields are present and
+// valid.Otherwise, returns false and does not modify |signed_tree_head|.
+NET_EXPORT bool FillSignedTreeHead(
+    const base::StringPiece& json_signed_tree_head,
+    SignedTreeHead* signed_tree_head);
+
+}  // namespace ct
+
+}  // namespace net
+#endif  // NET_CERT_CT_LOG_RESPONSE_PARSER_H_