Add QuicFramer and friends.

net/quic/crypto/crypto_protocol.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_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
+#define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/string_piece.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+typedef uint32 CryptoTag;
+typedef std::map<CryptoTag, base::StringPiece> CryptoTagValueMap;
+struct NET_EXPORT_PRIVATE CryptoHandshakeMessage {
+  CryptoHandshakeMessage();
+  ~CryptoHandshakeMessage();
+  CryptoTag tag;
+  CryptoTagValueMap tag_value_map;
+};
+
+// Crypto tags are written to the wire with a big-endian
+// representation of the name of the tag.  For example
+// the client hello tag (CHLO) will be written as the
+// following 4 bytes: 'C' 'H' 'L' 'O'.  Since it is
+// stored in memory as a little endian uint32, we need
+// to reverse the order of the bytes.
+#define MAKE_TAG(a,b,c,d) (d << 24) + (c << 16) + (b << 8) + a
+
+const CryptoTag kCHLO = MAKE_TAG('C', 'H', 'L', 'O');  // Client hello
+const CryptoTag kSHLO = MAKE_TAG('S', 'H', 'L', 'O');  // Server hello
+
+// AEAD algorithms
+const CryptoTag kNULL = MAKE_TAG('N', 'U', 'L', 'L');  // null algorithm
+const CryptoTag kAESH = MAKE_TAG('A', 'E', 'S', 'H');  // AES128 + SHA256
+
+const size_t kMaxEntries = 16;  // Max number of entries in a message.
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_