591 lines
18 KiB
C++
591 lines
18 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 2002-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: punycode.cpp
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002jan31
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* created by: Markus W. Scherer
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*/
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/* This ICU code derived from: */
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/*
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punycode.c 0.4.0 (2001-Nov-17-Sat)
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http://www.cs.berkeley.edu/~amc/idn/
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Adam M. Costello
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http://www.nicemice.net/amc/
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Disclaimer and license
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Regarding this entire document or any portion of it (including
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the pseudocode and C code), the author makes no guarantees and
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is not responsible for any damage resulting from its use. The
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author grants irrevocable permission to anyone to use, modify,
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and distribute it in any way that does not diminish the rights
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of anyone else to use, modify, and distribute it, provided that
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redistributed derivative works do not contain misleading author or
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version information. Derivative works need not be licensed under
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similar terms.
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*/
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/*
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* ICU modifications:
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* - ICU data types and coding conventions
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* - ICU string buffer handling with implicit source lengths
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* and destination preflighting
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* - UTF-16 handling
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_IDNA
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#include "unicode/ustring.h"
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#include "unicode/utf.h"
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#include "unicode/utf16.h"
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#include "ustr_imp.h"
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#include "cstring.h"
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#include "cmemory.h"
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#include "punycode.h"
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#include "uassert.h"
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/* Punycode ----------------------------------------------------------------- */
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/* Punycode parameters for Bootstring */
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#define BASE 36
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#define TMIN 1
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#define TMAX 26
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#define SKEW 38
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#define DAMP 700
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#define INITIAL_BIAS 72
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#define INITIAL_N 0x80
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/* "Basic" Unicode/ASCII code points */
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#define _HYPHEN 0X2d
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#define DELIMITER _HYPHEN
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#define _ZERO_ 0X30
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#define _NINE 0x39
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#define _SMALL_A 0X61
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#define _SMALL_Z 0X7a
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#define _CAPITAL_A 0X41
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#define _CAPITAL_Z 0X5a
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#define IS_BASIC(c) ((c)<0x80)
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#define IS_BASIC_UPPERCASE(c) (_CAPITAL_A<=(c) && (c)<=_CAPITAL_Z)
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/**
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* digitToBasic() returns the basic code point whose value
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* (when used for representing integers) is d, which must be in the
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* range 0 to BASE-1. The lowercase form is used unless the uppercase flag is
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* nonzero, in which case the uppercase form is used.
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*/
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static inline char
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digitToBasic(int32_t digit, UBool uppercase) {
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/* 0..25 map to ASCII a..z or A..Z */
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/* 26..35 map to ASCII 0..9 */
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if(digit<26) {
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if(uppercase) {
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return (char)(_CAPITAL_A+digit);
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} else {
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return (char)(_SMALL_A+digit);
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}
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} else {
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return (char)((_ZERO_-26)+digit);
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}
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}
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/**
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* @return the numeric value of a basic code point (for use in representing integers)
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* in the range 0 to BASE-1, or a negative value if cp is invalid.
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*/
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static int32_t decodeDigit(int32_t cp) {
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if(cp<=u'Z') {
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if(cp<=u'9') {
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if(cp<u'0') {
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return -1;
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} else {
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return cp-u'0'+26; // 0..9 -> 26..35
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}
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} else {
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return cp-u'A'; // A-Z -> 0..25
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}
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} else if(cp<=u'z') {
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return cp-'a'; // a..z -> 0..25
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} else {
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return -1;
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}
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}
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static inline char
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asciiCaseMap(char b, UBool uppercase) {
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if(uppercase) {
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if(_SMALL_A<=b && b<=_SMALL_Z) {
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b-=(_SMALL_A-_CAPITAL_A);
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}
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} else {
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if(_CAPITAL_A<=b && b<=_CAPITAL_Z) {
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b+=(_SMALL_A-_CAPITAL_A);
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}
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}
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return b;
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}
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/* Punycode-specific Bootstring code ---------------------------------------- */
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/*
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* The following code omits the {parts} of the pseudo-algorithm in the spec
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* that are not used with the Punycode parameter set.
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*/
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/* Bias adaptation function. */
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static int32_t
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adaptBias(int32_t delta, int32_t length, UBool firstTime) {
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int32_t count;
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if(firstTime) {
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delta/=DAMP;
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} else {
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delta/=2;
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}
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delta+=delta/length;
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for(count=0; delta>((BASE-TMIN)*TMAX)/2; count+=BASE) {
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delta/=(BASE-TMIN);
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}
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return count+(((BASE-TMIN+1)*delta)/(delta+SKEW));
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}
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namespace {
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// ICU-13727: Limit input length for n^2 algorithm
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// where well-formed strings are at most 59 characters long.
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constexpr int32_t ENCODE_MAX_CODE_UNITS=1000;
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constexpr int32_t DECODE_MAX_CHARS=2000;
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} // namespace
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// encode
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U_CAPI int32_t
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u_strToPunycode(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity,
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const UBool *caseFlags,
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UErrorCode *pErrorCode) {
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int32_t cpBuffer[ENCODE_MAX_CODE_UNITS];
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int32_t n, delta, handledCPCount, basicLength, destLength, bias, j, m, q, k, t, srcCPCount;
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UChar c, c2;
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/* argument checking */
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return 0;
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}
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if(src==NULL || srcLength<-1 || (dest==NULL && destCapacity!=0)) {
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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if (srcLength>ENCODE_MAX_CODE_UNITS) {
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*pErrorCode=U_INPUT_TOO_LONG_ERROR;
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return 0;
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}
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/*
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* Handle the basic code points and
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* convert extended ones to UTF-32 in cpBuffer (caseFlag in sign bit):
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*/
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srcCPCount=destLength=0;
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if(srcLength==-1) {
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/* NUL-terminated input */
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for(j=0; /* no condition */; ++j) {
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if((c=src[j])==0) {
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break;
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}
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if(j>=ENCODE_MAX_CODE_UNITS) {
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*pErrorCode=U_INPUT_TOO_LONG_ERROR;
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return 0;
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}
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if(IS_BASIC(c)) {
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cpBuffer[srcCPCount++]=0;
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if(destLength<destCapacity) {
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dest[destLength]=
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caseFlags!=NULL ?
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asciiCaseMap((char)c, caseFlags[j]) :
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(char)c;
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}
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++destLength;
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} else {
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n=(caseFlags!=NULL && caseFlags[j])<<31L;
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if(U16_IS_SINGLE(c)) {
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n|=c;
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} else if(U16_IS_LEAD(c) && U16_IS_TRAIL(c2=src[j+1])) {
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++j;
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n|=(int32_t)U16_GET_SUPPLEMENTARY(c, c2);
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} else {
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/* error: unmatched surrogate */
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*pErrorCode=U_INVALID_CHAR_FOUND;
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return 0;
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}
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cpBuffer[srcCPCount++]=n;
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}
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}
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} else {
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/* length-specified input */
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for(j=0; j<srcLength; ++j) {
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c=src[j];
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if(IS_BASIC(c)) {
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cpBuffer[srcCPCount++]=0;
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if(destLength<destCapacity) {
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dest[destLength]=
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caseFlags!=NULL ?
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asciiCaseMap((char)c, caseFlags[j]) :
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(char)c;
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}
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++destLength;
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} else {
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n=(caseFlags!=NULL && caseFlags[j])<<31L;
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if(U16_IS_SINGLE(c)) {
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n|=c;
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} else if(U16_IS_LEAD(c) && (j+1)<srcLength && U16_IS_TRAIL(c2=src[j+1])) {
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++j;
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n|=(int32_t)U16_GET_SUPPLEMENTARY(c, c2);
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} else {
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/* error: unmatched surrogate */
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*pErrorCode=U_INVALID_CHAR_FOUND;
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return 0;
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}
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cpBuffer[srcCPCount++]=n;
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}
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}
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}
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/* Finish the basic string - if it is not empty - with a delimiter. */
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basicLength=destLength;
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if(basicLength>0) {
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if(destLength<destCapacity) {
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dest[destLength]=DELIMITER;
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}
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++destLength;
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}
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/*
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* handledCPCount is the number of code points that have been handled
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* basicLength is the number of basic code points
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* destLength is the number of chars that have been output
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*/
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/* Initialize the state: */
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n=INITIAL_N;
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delta=0;
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bias=INITIAL_BIAS;
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/* Main encoding loop: */
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for(handledCPCount=basicLength; handledCPCount<srcCPCount; /* no op */) {
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/*
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* All non-basic code points < n have been handled already.
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* Find the next larger one:
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*/
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for(m=0x7fffffff, j=0; j<srcCPCount; ++j) {
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q=cpBuffer[j]&0x7fffffff; /* remove case flag from the sign bit */
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if(n<=q && q<m) {
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m=q;
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}
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}
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/*
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* Increase delta enough to advance the decoder's
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* <n,i> state to <m,0>, but guard against overflow:
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*/
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if(m-n>(0x7fffffff-handledCPCount-delta)/(handledCPCount+1)) {
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*pErrorCode=U_INTERNAL_PROGRAM_ERROR;
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return 0;
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}
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delta+=(m-n)*(handledCPCount+1);
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n=m;
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/* Encode a sequence of same code points n */
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for(j=0; j<srcCPCount; ++j) {
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q=cpBuffer[j]&0x7fffffff; /* remove case flag from the sign bit */
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if(q<n) {
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++delta;
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} else if(q==n) {
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/* Represent delta as a generalized variable-length integer: */
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for(q=delta, k=BASE; /* no condition */; k+=BASE) {
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/** RAM: comment out the old code for conformance with draft-ietf-idn-punycode-03.txt
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t=k-bias;
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if(t<TMIN) {
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t=TMIN;
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} else if(t>TMAX) {
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t=TMAX;
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}
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*/
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t=k-bias;
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if(t<TMIN) {
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t=TMIN;
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} else if(k>=(bias+TMAX)) {
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t=TMAX;
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}
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if(q<t) {
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break;
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}
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if(destLength<destCapacity) {
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dest[destLength]=digitToBasic(t+(q-t)%(BASE-t), 0);
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}
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++destLength;
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q=(q-t)/(BASE-t);
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}
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if(destLength<destCapacity) {
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dest[destLength]=digitToBasic(q, (UBool)(cpBuffer[j]<0));
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}
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++destLength;
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bias=adaptBias(delta, handledCPCount+1, (UBool)(handledCPCount==basicLength));
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delta=0;
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++handledCPCount;
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}
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}
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++delta;
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++n;
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}
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return u_terminateUChars(dest, destCapacity, destLength, pErrorCode);
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}
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// decode
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U_CAPI int32_t
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u_strFromPunycode(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destCapacity,
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UBool *caseFlags,
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UErrorCode *pErrorCode) {
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int32_t n, destLength, i, bias, basicLength, j, in, oldi, w, k, digit, t,
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destCPCount, firstSupplementaryIndex, cpLength;
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UChar b;
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/* argument checking */
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return 0;
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}
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if(src==NULL || srcLength<-1 || (dest==NULL && destCapacity!=0)) {
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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if(srcLength==-1) {
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srcLength=u_strlen(src);
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}
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if (srcLength>DECODE_MAX_CHARS) {
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*pErrorCode=U_INPUT_TOO_LONG_ERROR;
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return 0;
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}
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/*
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* Handle the basic code points:
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* Let basicLength be the number of input code points
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* before the last delimiter, or 0 if there is none,
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* then copy the first basicLength code points to the output.
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*
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* The two following loops iterate backward.
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*/
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for(j=srcLength; j>0;) {
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if(src[--j]==DELIMITER) {
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break;
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}
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}
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destLength=basicLength=destCPCount=j;
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U_ASSERT(destLength>=0);
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while(j>0) {
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b=src[--j];
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if(!IS_BASIC(b)) {
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*pErrorCode=U_INVALID_CHAR_FOUND;
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return 0;
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}
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if(j<destCapacity) {
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dest[j]=(UChar)b;
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if(caseFlags!=NULL) {
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caseFlags[j]=IS_BASIC_UPPERCASE(b);
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}
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}
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}
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/* Initialize the state: */
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n=INITIAL_N;
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i=0;
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bias=INITIAL_BIAS;
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firstSupplementaryIndex=1000000000;
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/*
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* Main decoding loop:
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* Start just after the last delimiter if any
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* basic code points were copied; start at the beginning otherwise.
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*/
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for(in=basicLength>0 ? basicLength+1 : 0; in<srcLength; /* no op */) {
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/*
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* in is the index of the next character to be consumed, and
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* destCPCount is the number of code points in the output array.
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*
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* Decode a generalized variable-length integer into delta,
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* which gets added to i. The overflow checking is easier
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* if we increase i as we go, then subtract off its starting
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* value at the end to obtain delta.
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*/
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for(oldi=i, w=1, k=BASE; /* no condition */; k+=BASE) {
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if(in>=srcLength) {
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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return 0;
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}
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digit=decodeDigit(src[in++]);
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if(digit<0) {
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*pErrorCode=U_INVALID_CHAR_FOUND;
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return 0;
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}
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if(digit>(0x7fffffff-i)/w) {
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/* integer overflow */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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return 0;
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}
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i+=digit*w;
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/** RAM: comment out the old code for conformance with draft-ietf-idn-punycode-03.txt
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t=k-bias;
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if(t<TMIN) {
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t=TMIN;
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} else if(t>TMAX) {
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t=TMAX;
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}
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*/
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t=k-bias;
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if(t<TMIN) {
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t=TMIN;
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} else if(k>=(bias+TMAX)) {
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t=TMAX;
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}
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if(digit<t) {
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break;
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}
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if(w>0x7fffffff/(BASE-t)) {
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/* integer overflow */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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return 0;
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}
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w*=BASE-t;
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}
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/*
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* Modification from sample code:
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* Increments destCPCount here,
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* where needed instead of in for() loop tail.
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*/
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++destCPCount;
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bias=adaptBias(i-oldi, destCPCount, (UBool)(oldi==0));
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/*
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* i was supposed to wrap around from (incremented) destCPCount to 0,
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* incrementing n each time, so we'll fix that now:
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*/
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if(i/destCPCount>(0x7fffffff-n)) {
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/* integer overflow */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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return 0;
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}
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n+=i/destCPCount;
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i%=destCPCount;
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/* not needed for Punycode: */
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/* if (decode_digit(n) <= BASE) return punycode_invalid_input; */
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if(n>0x10ffff || U_IS_SURROGATE(n)) {
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/* Unicode code point overflow */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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return 0;
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}
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/* Insert n at position i of the output: */
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cpLength=U16_LENGTH(n);
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if(dest!=NULL && ((destLength+cpLength)<=destCapacity)) {
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int32_t codeUnitIndex;
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/*
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* Handle indexes when supplementary code points are present.
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*
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* In almost all cases, there will be only BMP code points before i
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* and even in the entire string.
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* This is handled with the same efficiency as with UTF-32.
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*
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* Only the rare cases with supplementary code points are handled
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* more slowly - but not too bad since this is an insertion anyway.
|
|
*/
|
|
if(i<=firstSupplementaryIndex) {
|
|
codeUnitIndex=i;
|
|
if(cpLength>1) {
|
|
firstSupplementaryIndex=codeUnitIndex;
|
|
} else {
|
|
++firstSupplementaryIndex;
|
|
}
|
|
} else {
|
|
codeUnitIndex=firstSupplementaryIndex;
|
|
U16_FWD_N(dest, codeUnitIndex, destLength, i-codeUnitIndex);
|
|
}
|
|
|
|
/* use the UChar index codeUnitIndex instead of the code point index i */
|
|
if(codeUnitIndex<destLength) {
|
|
uprv_memmove(dest+codeUnitIndex+cpLength,
|
|
dest+codeUnitIndex,
|
|
(destLength-codeUnitIndex)*U_SIZEOF_UCHAR);
|
|
if(caseFlags!=NULL) {
|
|
uprv_memmove(caseFlags+codeUnitIndex+cpLength,
|
|
caseFlags+codeUnitIndex,
|
|
destLength-codeUnitIndex);
|
|
}
|
|
}
|
|
if(cpLength==1) {
|
|
/* BMP, insert one code unit */
|
|
dest[codeUnitIndex]=(UChar)n;
|
|
} else {
|
|
/* supplementary character, insert two code units */
|
|
dest[codeUnitIndex]=U16_LEAD(n);
|
|
dest[codeUnitIndex+1]=U16_TRAIL(n);
|
|
}
|
|
if(caseFlags!=NULL) {
|
|
/* Case of last character determines uppercase flag: */
|
|
caseFlags[codeUnitIndex]=IS_BASIC_UPPERCASE(src[in-1]);
|
|
if(cpLength==2) {
|
|
caseFlags[codeUnitIndex+1]=false;
|
|
}
|
|
}
|
|
}
|
|
destLength+=cpLength;
|
|
U_ASSERT(destLength>=0);
|
|
++i;
|
|
}
|
|
|
|
return u_terminateUChars(dest, destCapacity, destLength, pErrorCode);
|
|
}
|
|
|
|
/* ### check notes on overflow handling - only necessary if not IDNA? are these Punycode functions to be public? */
|
|
|
|
#endif /* #if !UCONFIG_NO_IDNA */
|