text: /*
   * Copyright 2007-2021 CM4all GmbH
   * All rights reserved.
   *
   * author: Max Kellermann <mk@cm4all.com>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * - Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the
   * distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
   * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*
   * URI character classification according to RFC 2396.
   */
  
  #pragma once
  
  #include "util/CharUtil.hxx"
  
  constexpr bool
  IsUriMarkChar(char ch) noexcept
  {
  	return ch == '-' || ch == '_' || ch == '.' || ch == '!' || ch == '~' ||
  		ch == '*' || ch == '\'' || ch == '(' || ch == ')';
  }
  
  /**
   * See RFC 2396 2.3.
   */
  constexpr bool
  IsUriUnreservedChar(char ch) noexcept
  {
  	return IsAlphaNumericASCII(ch) || IsUriMarkChar(ch);
  }
  
  /**
   * See RFC 2396 3.3.
   */
  constexpr bool
  IsUriPchar(char ch) noexcept
  {
  	return IsUriUnreservedChar(ch) ||
  		ch == '%' || /* "escaped" */
  		ch == ':' || ch == '@' || ch == '&' || ch == '=' || ch == '+' ||
  		ch == '$' || ch == ',';
  }
  