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net/server/web_socket_frame.h

+// Copyright (c) 2011 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_SERVER_WEB_SOCKET_FRAME_H_
+#define NET_SERVER_WEB_SOCKET_FRAME_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+#include <vector>
+
+namespace net {
+
+class WebSocketFrame {
+  static const unsigned char kFinalBit;
+  static const unsigned char kReserved1Bit;
+  static const unsigned char kReserved2Bit;
+  static const unsigned char kReserved3Bit;
+  static const unsigned char kOpCodeMask;
+  static const unsigned char kMaskBit;
+  static const unsigned char kPayloadLengthMask;
+
+  static const size_t kMaxSingleBytePayloadLength;
+  static const size_t kTwoBytePayloadLengthField;
+  static const size_t kEightBytePayloadLengthField;
+  static const size_t kMaskingKeyWidthInBytes;
+
+ public:
+  // Hybi-10 opcodes.
+  typedef unsigned int OpCode;
+  static const OpCode kOpCodeContinuation;
+  static const OpCode kOpCodeText;
+  static const OpCode kOpCodeBinary;
+  static const OpCode kOpCodeClose;
+  static const OpCode kOpCodePing;
+  static const OpCode kOpCodePong;
+
+  enum ParseResult {
+    FrameOK,
+    FrameIncomplete,
+    FrameError
+  };
+
+  OpCode op_code_;
+  bool final_;
+  bool reserved1_;
+  bool reserved2_;
+  bool reserved3_;
+  bool masked_;
+  const char* payload_;
+  size_t payload_length_;
+  const char* frame_end_;
+
+  bool isNonControlOpCode() const {
+    return op_code_ == kOpCodeContinuation ||
+           op_code_ == kOpCodeText ||
+           op_code_ == kOpCodeBinary;
+  }
+  bool isControlOpCode() const {
+    return op_code_ == kOpCodeClose ||
+           op_code_ == kOpCodePing ||
+           op_code_ == kOpCodePong;
+  }
+  bool isReservedOpCode() const {
+    return !isNonControlOpCode() && !isControlOpCode();
+  }
+
+  ParseResult DecodeFrame(const char* data, size_t data_length);
+  std::vector<char> EncodeFrame(OpCode op_code,
+                                const char* data,
+                                size_t data_length);
+};
+
+}  // namespace net
+
+#endif // NET_SERVER_WEB_SOCKET_FRAME_H_