Implement WebSocketExtensionParser

net/websockets/websocket_extension_parser.h

+// Copyright 2013 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_WEBSOCKETS_WEBSOCKET_EXTENSION_PARSER_H_
+#define NET_WEBSOCKETS_WEBSOCKET_EXTENSION_PARSER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/websockets/websocket_extension.h"
+
+namespace net {
+
+class NET_EXPORT_PRIVATE WebSocketExtensionParser {
+ public:
+  WebSocketExtensionParser();
+  ~WebSocketExtensionParser();
+
+  // Parses the given string as a WebSocket extension header value.
+  void Parse(const char* data, size_t size);
+  void Parse(const std::string& data) {
+    Parse(data.data(), data.size());
+  }
+
+  const char* current() const { return current_; }
+  bool has_error() const { return has_error_; }
+  const std::vector<WebSocketExtension>& extensions() const {
+    return extensions_;
+  }
+
+ private:
+  class CurrentPointerBackup;
+
+  void Consume(const char* data, size_t size);
+  void ConsumeExtensionList();
+  void ConsumeExtension(WebSocketExtension* extension);
+  void ConsumeExtensionParameter(WebSocketExtension::Parameter* parameter);
+  void ConsumeToken(base::StringPiece* token);
+  void ConsumeQuotedToken(std::string* token);
+  void ConsumeLWS();
+  size_t UnconsumedBytes() const { return end_ - current_; }
+
+  static bool IsControl(char c);
+  static bool IsSeparator(char c);
+
+  const char* current_;
+  const char* end_;
+  bool has_error_;
+  std::vector<WebSocketExtension> extensions_;
+};
+
+}  // namespace net
+
+#endif  // NET_WEBSOCKETS_WEBSOCKET_EXTENSION_PARSER_H_