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+// Copyright (C) 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: US-ASCII
+* 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
+ */
+
+#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);
+ }
+}
+
+/**
+ * basicToDigit[] contains the numeric value of a basic code
+ * point (for use in representing integers) in the range 0 to
+ * BASE-1, or -1 if b is does not represent a value.
+ */
+static const int8_t
+basicToDigit[256]={
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1,
+
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -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));
+}
+
+#define MAX_CP_COUNT 200
+
+U_CFUNC int32_t
+u_strToPunycode(const UChar *src, int32_t srcLength,
+ UChar *dest, int32_t destCapacity,
+ const UBool *caseFlags,
+ UErrorCode *pErrorCode) {
+
+ int32_t cpBuffer[MAX_CP_COUNT];
+ 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;
+ }
+
+ /*
+ * 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(srcCPCount==MAX_CP_COUNT) {
+ /* too many input code points */
+ *pErrorCode=U_INDEX_OUTOFBOUNDS_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) {
+ if(srcCPCount==MAX_CP_COUNT) {
+ /* too many input code points */
+ *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+ return 0;
+ }
+ 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-MAX_CP_COUNT-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);
+}
+
+U_CFUNC 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);
+ }
+
+ /*
+ * 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=basicToDigit[(uint8_t)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 */
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