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