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idna.h
// © 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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