Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// A set of lexical analyzer classes.  These classes can be combined
+// with the methods in split.hpp to create parsers.
+
+#ifndef OPENVPN_COMMON_LEX_H
+#define OPENVPN_COMMON_LEX_H
+
+#include <openvpn/common/string.hpp>
+
+namespace openvpn {
+
+  // This class (or others that define an is_space method) is used as a
+  // template parameter to methods in split.hpp.
+  struct SpaceMatch
+  {
+    static bool is_space(char c)
+    {
+      return string::is_space(c);
+    }
+  };
+
+  // A basic lexical analyzer that understands quoting
+  class StandardLex
+  {
+  public:
+    StandardLex() : in_quote_(false), backslash(false), ch(-1) {}
+
+    void put(char c)
+    {
+      if (backslash)
+	{
+	  ch = c;
+	  backslash = false;
+	}
+      else if (c == '\\')
+	{
+	  backslash = true;
+	  ch = -1;
+	}
+      else if (c == '\"')
+	{
+	  in_quote_ = !in_quote_;
+	  ch = -1;
+	}
+      else
+	{
+	  ch = c;
+	}
+    }
+
+    bool available() const { return ch != -1; }
+    int get() const { return ch; }
+    void reset() { ch = -1; }
+
+    bool in_quote() const { return in_quote_; }
+
+  private:
+    bool in_quote_;
+    bool backslash;
+    int ch;
+  };
+
+  // A null lexical analyzer has no special understanding
+  // of any particular string character.
+  class NullLex
+  {
+  public:
+    NullLex() : ch(-1) {}
+
+    void put(char c) { ch = c; }
+    bool available() const { return ch != -1; }
+    int get() const { return ch; }
+    void reset() { ch = -1; }
+    bool in_quote() const { return false; }
+
+  private:
+    int ch;
+  };
+
+} // namespace openvpn
+
+#endif // OPENVPN_COMMON_LEX_H