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 // © 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
 *   Copyright (C) 2010-2012, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *******************************************************************************
 *   file name:  idna.h
 *   encoding:   UTF-8
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2010mar05
 *   created by: Markus W. Scherer
 */
 
 #ifndef __IDNA_H__
 #define __IDNA_H__
 
 /**
  * \file
  * \brief C++ API: Internationalizing Domain Names in Applications (IDNA)
  */
 
 #include "unicode/utypes.h"
 
 #if U_SHOW_CPLUSPLUS_API
 
 #if !UCONFIG_NO_IDNA
 
 #include "unicode/bytestream.h"
 #include "unicode/stringpiece.h"
 #include "unicode/uidna.h"
 #include "unicode/unistr.h"
 
 U_NAMESPACE_BEGIN
 
 class IDNAInfo;
 
 /**
  * Abstract base class for IDNA processing.
  * See http://www.unicode.org/reports/tr46/
  * and http://www.ietf.org/rfc/rfc3490.txt
  *
  * The IDNA class is not intended for public subclassing.
  *
  * This C++ API currently only implements UTS #46.
  * The uidna.h C API implements both UTS #46 (functions using UIDNA service object)
  * and IDNA2003 (functions that do not use a service object).
  * @stable ICU 4.6
  */
 class U_COMMON_API IDNA : public UObject {
 public:
     /**
      * Destructor.
      * @stable ICU 4.6
      */
     ~IDNA();
 
     /**
      * Returns an IDNA instance which implements UTS #46.
      * Returns an unmodifiable instance, owned by the caller.
      * Cache it for multiple operations, and delete it when done.
      * The instance is thread-safe, that is, it can be used concurrently.
      *
      * UTS #46 defines Unicode IDNA Compatibility Processing,
      * updated to the latest version of Unicode and compatible with both
      * IDNA2003 and IDNA2008.
      *
      * The worker functions use transitional processing, including deviation mappings,
      * unless UIDNA_NONTRANSITIONAL_TO_ASCII or UIDNA_NONTRANSITIONAL_TO_UNICODE
      * is used in which case the deviation characters are passed through without change.
      *
      * Disallowed characters are mapped to U+FFFD.
      *
      * For available options see the uidna.h header.
      * Operations with the UTS #46 instance do not support the
      * UIDNA_ALLOW_UNASSIGNED option.
      *
      * By default, the UTS #46 implementation allows all ASCII characters (as valid or mapped).
      * When the UIDNA_USE_STD3_RULES option is used, ASCII characters other than
      * letters, digits, hyphen (LDH) and dot/full stop are disallowed and mapped to U+FFFD.
      *
      * @param options Bit set to modify the processing and error checking.
      *                See option bit set values in uidna.h.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return the UTS #46 IDNA instance, if successful
      * @stable ICU 4.6
      */
     static IDNA *
     createUTS46Instance(uint32_t options, UErrorCode &errorCode);
 
     /**
      * Converts a single domain name label into its ASCII form for DNS lookup.
      * If any processing step fails, then info.hasErrors() will be true and
      * the result might not be an ASCII string.
      * The label might be modified according to the types of errors.
      * Labels with severe errors will be left in (or turned into) their Unicode form.
      *
      * The UErrorCode indicates an error only in exceptional cases,
      * such as a U_MEMORY_ALLOCATION_ERROR.
      *
      * @param label Input domain name label
      * @param dest Destination string object
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual UnicodeString &
     labelToASCII(const UnicodeString &label, UnicodeString &dest,
                  IDNAInfo &info, UErrorCode &errorCode) const = 0;
 
     /**
      * Converts a single domain name label into its Unicode form for human-readable display.
      * If any processing step fails, then info.hasErrors() will be true.
      * The label might be modified according to the types of errors.
      *
      * The UErrorCode indicates an error only in exceptional cases,
      * such as a U_MEMORY_ALLOCATION_ERROR.
      *
      * @param label Input domain name label
      * @param dest Destination string object
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual UnicodeString &
     labelToUnicode(const UnicodeString &label, UnicodeString &dest,
                    IDNAInfo &info, UErrorCode &errorCode) const = 0;
 
     /**
      * Converts a whole domain name into its ASCII form for DNS lookup.
      * If any processing step fails, then info.hasErrors() will be true and
      * the result might not be an ASCII string.
      * The domain name might be modified according to the types of errors.
      * Labels with severe errors will be left in (or turned into) their Unicode form.
      *
      * The UErrorCode indicates an error only in exceptional cases,
      * such as a U_MEMORY_ALLOCATION_ERROR.
      *
      * @param name Input domain name
      * @param dest Destination string object
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual UnicodeString &
     nameToASCII(const UnicodeString &name, UnicodeString &dest,
                 IDNAInfo &info, UErrorCode &errorCode) const = 0;
 
     /**
      * Converts a whole domain name into its Unicode form for human-readable display.
      * If any processing step fails, then info.hasErrors() will be true.
      * The domain name might be modified according to the types of errors.
      *
      * The UErrorCode indicates an error only in exceptional cases,
      * such as a U_MEMORY_ALLOCATION_ERROR.
      *
      * @param name Input domain name
      * @param dest Destination string object
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual UnicodeString &
     nameToUnicode(const UnicodeString &name, UnicodeString &dest,
                   IDNAInfo &info, UErrorCode &errorCode) const = 0;
 
     // UTF-8 versions of the processing methods ---------------------------- ***
 
     /**
      * Converts a single domain name label into its ASCII form for DNS lookup.
      * UTF-8 version of labelToASCII(), same behavior.
      *
      * @param label Input domain name label
      * @param dest Destination byte sink; Flush()ed if successful
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual void
     labelToASCII_UTF8(StringPiece label, ByteSink &dest,
                       IDNAInfo &info, UErrorCode &errorCode) const;
 
     /**
      * Converts a single domain name label into its Unicode form for human-readable display.
      * UTF-8 version of labelToUnicode(), same behavior.
      *
      * @param label Input domain name label
      * @param dest Destination byte sink; Flush()ed if successful
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual void
     labelToUnicodeUTF8(StringPiece label, ByteSink &dest,
                        IDNAInfo &info, UErrorCode &errorCode) const;
 
     /**
      * Converts a whole domain name into its ASCII form for DNS lookup.
      * UTF-8 version of nameToASCII(), same behavior.
      *
      * @param name Input domain name
      * @param dest Destination byte sink; Flush()ed if successful
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual void
     nameToASCII_UTF8(StringPiece name, ByteSink &dest,
                      IDNAInfo &info, UErrorCode &errorCode) const;
 
     /**
      * Converts a whole domain name into its Unicode form for human-readable display.
      * UTF-8 version of nameToUnicode(), same behavior.
      *
      * @param name Input domain name
      * @param dest Destination byte sink; Flush()ed if successful
      * @param info Output container of IDNA processing details.
      * @param errorCode Standard ICU error code. Its input value must
      *                  pass the U_SUCCESS() test, or else the function returns
      *                  immediately. Check for U_FAILURE() on output or use with
      *                  function chaining. (See User Guide for details.)
      * @return dest
      * @stable ICU 4.6
      */
     virtual void
     nameToUnicodeUTF8(StringPiece name, ByteSink &dest,
                       IDNAInfo &info, UErrorCode &errorCode) const;
 };
 
 class UTS46;
 
 /**
  * Output container for IDNA processing errors.
  * The IDNAInfo class is not suitable for subclassing.
  * @stable ICU 4.6
  */
 class U_COMMON_API IDNAInfo : public UMemory {
 public:
     /**
      * Constructor for stack allocation.
      * @stable ICU 4.6
      */
     IDNAInfo() : errors(0), labelErrors(0), isTransDiff(false), isBiDi(false), isOkBiDi(true) {}
     /**
      * Were there IDNA processing errors?
      * @return true if there were processing errors
      * @stable ICU 4.6
      */
     UBool hasErrors() const { return errors!=0; }
     /**
      * Returns a bit set indicating IDNA processing errors.
      * See UIDNA_ERROR_... constants in uidna.h.
      * @return bit set of processing errors
      * @stable ICU 4.6
      */
     uint32_t getErrors() const { return errors; }
     /**
      * Returns true if transitional and nontransitional processing produce different results.
      * This is the case when the input label or domain name contains
      * one or more deviation characters outside a Punycode label (see UTS #46).
      * <ul>
      * <li>With nontransitional processing, such characters are
      * copied to the destination string.
      * <li>With transitional processing, such characters are
      * mapped (sharp s/sigma) or removed (joiner/nonjoiner).
      * </ul>
      * @return true if transitional and nontransitional processing produce different results
      * @stable ICU 4.6
      */
     UBool isTransitionalDifferent() const { return isTransDiff; }
 
 private:
     friend class UTS46;
 
     IDNAInfo(const IDNAInfo &other) = delete;  // no copying
     IDNAInfo &operator=(const IDNAInfo &other) = delete;  // no copying
 
     void reset() {
         errors=labelErrors=0;
         isTransDiff=false;
         isBiDi=false;
         isOkBiDi=true;
     }
 
     uint32_t errors, labelErrors;
     UBool isTransDiff;
     UBool isBiDi;
     UBool isOkBiDi;
 };
 
 U_NAMESPACE_END
 
 #endif  // UCONFIG_NO_IDNA
 
 #endif /* U_SHOW_CPLUSPLUS_API */
 
 #endif  // __IDNA_H__

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