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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__