6 *   Copyright (C) 2002-2011, International Business Machines
11 *   encoding:   UTF-8
13 *   indentation:4
22 punycode.c 0.4.0 (2001-Nov-17-Sat)
35     redistributed derivative works do not contain misleading author or
41  * - ICU data types and coding conventions
42  * - ICU string buffer handling with implicit source lengths
44  * - UTF-16 handling
61 /* Punycode ----------------------------------------------------------------- */
91  * range 0 to BASE-1. The lowercase form is used unless the uppercase flag is
105         return (char)((_ZERO_-26)+digit);  in digitToBasic()
111  *         in the range 0 to BASE-1, or a negative value if cp is invalid.
117                 return -1;  in decodeDigit()
119                 return cp-u'0'+26;  // 0..9 -> 26..35  in decodeDigit()
122             return cp-u'A';  // A-Z -> 0..25  in decodeDigit()
125         return cp-'a';  // a..z -> 0..25  in decodeDigit()
127         return -1;  in decodeDigit()
135             b-=(_SMALL_A-_CAPITAL_A);  in asciiCaseMap()
139             b+=(_SMALL_A-_CAPITAL_A);  in asciiCaseMap()
145 /* Punycode-specific Bootstring code ---------------------------------------- */
148  * The following code omits the {parts} of the pseudo-algorithm in the spec
164     for(count=0; delta>((BASE-TMIN)*TMAX)/2; count+=BASE) {  in adaptBias()
165         delta/=(BASE-TMIN);  in adaptBias()
168     return count+(((BASE-TMIN+1)*delta)/(delta+SKEW));  in adaptBias()
173 // ICU-13727: Limit input length for n^2 algorithm
174 // where well-formed strings are at most 59 characters long.
196     if(src==NULL || srcLength<-1 || (dest==NULL && destCapacity!=0)) {  in u_strToPunycode()
207      * convert extended ones to UTF-32 in cpBuffer (caseFlag in sign bit):  in u_strToPunycode()
210     if(srcLength==-1) {  in u_strToPunycode()
211         /* NUL-terminated input */  in u_strToPunycode()
245         /* length-specified input */  in u_strToPunycode()
274     /* Finish the basic string - if it is not empty - with a delimiter. */  in u_strToPunycode()
297          * All non-basic code points < n have been handled already.  in u_strToPunycode()
311         if(m-n>(0x7fffffff-handledCPCount-delta)/(handledCPCount+1)) {  in u_strToPunycode()
315         delta+=(m-n)*(handledCPCount+1);  in u_strToPunycode()
324                 /* Represent delta as a generalized variable-length integer: */  in u_strToPunycode()
327 …              /** RAM: comment out the old code for conformance with draft-ietf-idn-punycode-03.txt  in u_strToPunycode()
329                     t=k-bias;  in u_strToPunycode()
337                     t=k-bias;  in u_strToPunycode()
349                         dest[destLength]=digitToBasic(t+(q-t)%(BASE-t), 0);  in u_strToPunycode()
352                     q=(q-t)/(BASE-t);  in u_strToPunycode()
387     if(src==NULL || srcLength<-1 || (dest==NULL && destCapacity!=0)) {  in u_strFromPunycode()
392     if(srcLength==-1) {  in u_strFromPunycode()
409         if(src[--j]==DELIMITER) {  in u_strFromPunycode()
417         b=src[--j];  in u_strFromPunycode()
448          * Decode a generalized variable-length integer into delta,  in u_strFromPunycode()
464             if(digit>(0x7fffffff-i)/w) {  in u_strFromPunycode()
471             /** RAM: comment out the old code for conformance with draft-ietf-idn-punycode-03.txt    in u_strFromPunycode()
472             t=k-bias;  in u_strFromPunycode()
479             t=k-bias;  in u_strFromPunycode()
489             if(w>0x7fffffff/(BASE-t)) {  in u_strFromPunycode()
494             w*=BASE-t;  in u_strFromPunycode()
503         bias=adaptBias(i-oldi, destCPCount, (UBool)(oldi==0));  in u_strFromPunycode()
509         if(i/destCPCount>(0x7fffffff-n)) {  in u_strFromPunycode()
536              * This is handled with the same efficiency as with UTF-32.  in u_strFromPunycode()
539              * more slowly - but not too bad since this is an insertion anyway.  in u_strFromPunycode()
550                 U16_FWD_N(dest, codeUnitIndex, destLength, i-codeUnitIndex);  in u_strFromPunycode()
557                              (destLength-codeUnitIndex)*U_SIZEOF_UCHAR);  in u_strFromPunycode()
561                                  destLength-codeUnitIndex);  in u_strFromPunycode()
574                 caseFlags[codeUnitIndex]=IS_BASIC_UPPERCASE(src[in-1]);  in u_strFromPunycode()
588 /* ### check notes on overflow handling - only necessary if not IDNA? are these Punycode functions …