text: /* -*- C++ -*- */
  // ======================================================================
  //
  // The actual conversion methods are covered by the copyright information
  // below.
  // Chad Elliott 4/28/2005
  //
  // Copyright 2001-2004 Unicode, Inc.
  //
  // Limitations on Rights to Redistribute This Code
  //
  // Unicode, Inc. hereby grants the right to freely use the information
  // supplied in this file in the creation of products supporting the
  // Unicode Standard, and to make copies of this file in any form
  // for internal or external distribution as long as this notice
  // remains attached.
  //
  // ======================================================================
  
  ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  
  ACE_INLINE bool
  ACE_UTF16_Encoding_Converter::is_legal_utf8 (const ACE_Byte* source,
                                               size_t length) const
  {
    ACE_Byte a;
    const ACE_Byte* srcptr = source + length;
  
    switch (length)
      {
      default:
        return false;
  
      // Everything else falls through when "true"...
      case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
      case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
      case 2: if ((a = (*--srcptr)) > 0xBF) return false;
  
      switch (*source)
        {
        // no fall-through in this inner switch
        case 0xE0:
          if (a < 0xA0)
            return false;
          break;
        case 0xED:
          if (a > 0x9F)
            return false;
          break;
        case 0xF0:
          if (a < 0x90)
            return false;
          break;
        case 0xF4:
          if (a > 0x8F)
            return false;
          break;
        default:
          if (a < 0x80)
            return false;
      }
  
      case 1:
        if (*source >= 0x80 && *source < 0xC2)
          return false;
      }
  
    if (*source > 0xF4)
      return false;
  
    return true;
  }
  
  ACE_END_VERSIONED_NAMESPACE_DECL
  