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/*
*******************************************************************************
*
* Copyright (C) 2003-2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: uidna.h
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2003feb1
* created by: Ram Viswanadha
*/
#ifndef __UIDNA_H__
#define __UIDNA_H__
#include "unicode/utypes.h"
#if !UCONFIG_NO_IDNA
#include "unicode/parseerr.h"
/**
* \file
* \brief C API: Internationalized Domain Names in Applications Tranformation
*
* UIDNA API implements the IDNA protocol as defined in the IDNA RFC
* (http://www.ietf.org/rfc/rfc3490.txt).
* The RFC defines 2 operations: ToASCII and ToUnicode. Domain labels
* containing non-ASCII code points are required to be processed by
* ToASCII operation before passing it to resolver libraries. Domain names
* that are obtained from resolver libraries are required to be processed by
* ToUnicode operation before displaying the domain name to the user.
* IDNA requires that implementations process input strings with Nameprep
* (http://www.ietf.org/rfc/rfc3491.txt),
* which is a profile of Stringprep (http://www.ietf.org/rfc/rfc3454.txt),
* and then with Punycode (http://www.ietf.org/rfc/rfc3492.txt).
* Implementations of IDNA MUST fully implement Nameprep and Punycode;
* neither Nameprep nor Punycode are optional.
* The input and output of ToASCII and ToUnicode operations are Unicode
* and are designed to be chainable, i.e., applying ToASCII or ToUnicode operations
* multiple times to an input string will yield the same result as applying the operation
* once.
* ToUnicode(ToUnicode(ToUnicode...(ToUnicode(string)))) == ToUnicode(string)
* ToASCII(ToASCII(ToASCII...(ToASCII(string))) == ToASCII(string).
*
*/
/**
* Option to prohibit processing of unassigned codepoints in the input and
* do not check if the input conforms to STD-3 ASCII rules.
*
* @see uidna_toASCII uidna_toUnicode
* @stable ICU 2.6
*/
#define UIDNA_DEFAULT 0x0000
/**
* Option to allow processing of unassigned codepoints in the input
*
* @see uidna_toASCII uidna_toUnicode
* @stable ICU 2.6
*/
#define UIDNA_ALLOW_UNASSIGNED 0x0001
/**
* Option to check if input conforms to STD-3 ASCII rules
*
* @see uidna_toASCII uidna_toUnicode
* @stable ICU 2.6
*/
#define UIDNA_USE_STD3_RULES 0x0002
/**
* This function implements the ToASCII operation as defined in the IDNA RFC.
* This operation is done on <b>single labels</b> before sending it to something that expects
* ASCII names. A label is an individual part of a domain name. Labels are usually
* separated by dots; e.g." "www.example.com" is composed of 3 labels
* "www","example", and "com".
*
*
* @param src Input UChar array containing label in Unicode.
* @param srcLength Number of UChars in src, or -1 if NUL-terminated.
* @param dest Output UChar array with ASCII (ACE encoded) label.
* @param destCapacity Size of dest.
* @param options A bit set of options:
*
* - UIDNA_DEFAULT Use default options, i.e., do not process unassigned code points
* and do not use STD3 ASCII rules
* If unassigned code points are found the operation fails with
* U_UNASSIGNED_ERROR error code.
*
* - UIDNA_ALLOW_UNASSIGNED Unassigned values can be converted to ASCII for query operations
* If this option is set, the unassigned code points are in the input
* are treated as normal Unicode code points.
*
* - UIDNA_USE_STD3_RULES Use STD3 ASCII rules for host name syntax restrictions
* If this option is set and the input does not satisfy STD3 rules,
* the operation will fail with U_IDNA_STD3_ASCII_RULES_ERROR
*
* @param parseError Pointer to UParseError struct to receive information on position
* of error if an error is encountered. Can be NULL.
* @param status ICU in/out error code parameter.
* U_INVALID_CHAR_FOUND if src contains
* unmatched single surrogates.
* U_INDEX_OUTOFBOUNDS_ERROR if src contains
* too many code points.
* U_BUFFER_OVERFLOW_ERROR if destCapacity is not enough
* @return The length of the result string, if successful - or in case of a buffer overflow,
* in which case it will be greater than destCapacity.
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
uidna_toASCII(const UChar* src, int32_t srcLength,
UChar* dest, int32_t destCapacity,
int32_t options,
UParseError* parseError,
UErrorCode* status);
/**
* This function implements the ToUnicode operation as defined in the IDNA RFC.
* This operation is done on <b>single labels</b> before sending it to something that expects
* Unicode names. A label is an individual part of a domain name. Labels are usually
* separated by dots; for e.g." "www.example.com" is composed of 3 labels
* "www","example", and "com".
*
* @param src Input UChar array containing ASCII (ACE encoded) label.
* @param srcLength Number of UChars in src, or -1 if NUL-terminated.
* @param dest Output Converted UChar array containing Unicode equivalent of label.
* @param destCapacity Size of dest.
* @param options A bit set of options:
*
* - UIDNA_DEFAULT Use default options, i.e., do not process unassigned code points
* and do not use STD3 ASCII rules
* If unassigned code points are found the operation fails with
* U_UNASSIGNED_ERROR error code.
*
* - UIDNA_ALLOW_UNASSIGNED Unassigned values can be converted to ASCII for query operations
* If this option is set, the unassigned code points are in the input
* are treated as normal Unicode code points. <b> Note: </b> This option is
* required on toUnicode operation because the RFC mandates
* verification of decoded ACE input by applying toASCII and comparing
* its output with source
*
*
*
* - UIDNA_USE_STD3_RULES Use STD3 ASCII rules for host name syntax restrictions
* If this option is set and the input does not satisfy STD3 rules,
* the operation will fail with U_IDNA_STD3_ASCII_RULES_ERROR
*
* @param parseError Pointer to UParseError struct to receive information on position
* of error if an error is encountered. Can be NULL.
* @param status ICU in/out error code parameter.
* U_INVALID_CHAR_FOUND if src contains
* unmatched single surrogates.
* U_INDEX_OUTOFBOUNDS_ERROR if src contains
* too many code points.
* U_BUFFER_OVERFLOW_ERROR if destCapacity is not enough
* @return The length of the result string, if successful - or in case of a buffer overflow,
* in which case it will be greater than destCapacity.
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
uidna_toUnicode(const UChar* src, int32_t srcLength,
UChar* dest, int32_t destCapacity,
int32_t options,
UParseError* parseError,
UErrorCode* status);
/**
* Convenience function that implements the IDNToASCII operation as defined in the IDNA RFC.
* This operation is done on complete domain names, e.g: "www.example.com".
* It is important to note that this operation can fail. If it fails, then the input
* domain name cannot be used as an Internationalized Domain Name and the application
* should have methods defined to deal with the failure.
*
* <b>Note:</b> IDNA RFC specifies that a conformant application should divide a domain name
* into separate labels, decide whether to apply allowUnassigned and useSTD3ASCIIRules on each,
* and then convert. This function does not offer that level of granularity. The options once
* set will apply to all labels in the domain name
*
* @param src Input UChar array containing IDN in Unicode.
* @param srcLength Number of UChars in src, or -1 if NUL-terminated.
* @param dest Output UChar array with ASCII (ACE encoded) IDN.
* @param destCapacity Size of dest.
* @param options A bit set of options:
*
* - UIDNA_DEFAULT Use default options, i.e., do not process unassigned code points
* and do not use STD3 ASCII rules
* If unassigned code points are found the operation fails with
* U_UNASSIGNED_CODE_POINT_FOUND error code.
*
* - UIDNA_ALLOW_UNASSIGNED Unassigned values can be converted to ASCII for query operations
* If this option is set, the unassigned code points are in the input
* are treated as normal Unicode code points.
*
* - UIDNA_USE_STD3_RULES Use STD3 ASCII rules for host name syntax restrictions
* If this option is set and the input does not satisfy STD3 rules,
* the operation will fail with U_IDNA_STD3_ASCII_RULES_ERROR
*
* @param parseError Pointer to UParseError struct to receive information on position
* of error if an error is encountered. Can be NULL.
* @param status ICU in/out error code parameter.
* U_INVALID_CHAR_FOUND if src contains
* unmatched single surrogates.
* U_INDEX_OUTOFBOUNDS_ERROR if src contains
* too many code points.
* U_BUFFER_OVERFLOW_ERROR if destCapacity is not enough
* @return The length of the result string, if successful - or in case of a buffer overflow,
* in which case it will be greater than destCapacity.
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
uidna_IDNToASCII( const UChar* src, int32_t srcLength,
UChar* dest, int32_t destCapacity,
int32_t options,
UParseError* parseError,
UErrorCode* status);
/**
* Convenience function that implements the IDNToUnicode operation as defined in the IDNA RFC.
* This operation is done on complete domain names, e.g: "www.example.com".
*
* <b>Note:</b> IDNA RFC specifies that a conformant application should divide a domain name
* into separate labels, decide whether to apply allowUnassigned and useSTD3ASCIIRules on each,
* and then convert. This function does not offer that level of granularity. The options once
* set will apply to all labels in the domain name
*
* @param src Input UChar array containing IDN in ASCII (ACE encoded) form.
* @param srcLength Number of UChars in src, or -1 if NUL-terminated.
* @param dest Output UChar array containing Unicode equivalent of source IDN.
* @param destCapacity Size of dest.
* @param options A bit set of options:
*
* - UIDNA_DEFAULT Use default options, i.e., do not process unassigned code points
* and do not use STD3 ASCII rules
* If unassigned code points are found the operation fails with
* U_UNASSIGNED_CODE_POINT_FOUND error code.
*
* - UIDNA_ALLOW_UNASSIGNED Unassigned values can be converted to ASCII for query operations
* If this option is set, the unassigned code points are in the input
* are treated as normal Unicode code points.
*
* - UIDNA_USE_STD3_RULES Use STD3 ASCII rules for host name syntax restrictions
* If this option is set and the input does not satisfy STD3 rules,
* the operation will fail with U_IDNA_STD3_ASCII_RULES_ERROR
*
* @param parseError Pointer to UParseError struct to receive information on position
* of error if an error is encountered. Can be NULL.
* @param status ICU in/out error code parameter.
* U_INVALID_CHAR_FOUND if src contains
* unmatched single surrogates.
* U_INDEX_OUTOFBOUNDS_ERROR if src contains
* too many code points.
* U_BUFFER_OVERFLOW_ERROR if destCapacity is not enough
* @return The length of the result string, if successful - or in case of a buffer overflow,
* in which case it will be greater than destCapacity.
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
uidna_IDNToUnicode( const UChar* src, int32_t srcLength,
UChar* dest, int32_t destCapacity,
int32_t options,
UParseError* parseError,
UErrorCode* status);
/**
* Compare two IDN strings for equivalence.
* This function splits the domain names into labels and compares them.
* According to IDN RFC, whenever two labels are compared, they are
* considered equal if and only if their ASCII forms (obtained by
* applying toASCII) match using an case-insensitive ASCII comparison.
* Two domain names are considered a match if and only if all labels
* match regardless of whether label separators match.
*
* @param s1 First source string.
* @param length1 Length of first source string, or -1 if NUL-terminated.
*
* @param s2 Second source string.
* @param length2 Length of second source string, or -1 if NUL-terminated.
* @param options A bit set of options:
*
* - UIDNA_DEFAULT Use default options, i.e., do not process unassigned code points
* and do not use STD3 ASCII rules
* If unassigned code points are found the operation fails with
* U_UNASSIGNED_CODE_POINT_FOUND error code.
*
* - UIDNA_ALLOW_UNASSIGNED Unassigned values can be converted to ASCII for query operations
* If this option is set, the unassigned code points are in the input
* are treated as normal Unicode code points.
*
* - UIDNA_USE_STD3_RULES Use STD3 ASCII rules for host name syntax restrictions
* If this option is set and the input does not satisfy STD3 rules,
* the operation will fail with U_IDNA_STD3_ASCII_RULES_ERROR
*
* @param status ICU error code in/out parameter.
* Must fulfill U_SUCCESS before the function call.
* @return <0 or 0 or >0 as usual for string comparisons
* @stable ICU 2.6
*/
U_STABLE int32_t U_EXPORT2
uidna_compare( const UChar *s1, int32_t length1,
const UChar *s2, int32_t length2,
int32_t options,
UErrorCode* status);
#endif /* #if !UCONFIG_NO_IDNA */
#endif