The Tor Browser: intl/icu/source/common/uidna.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/uidna.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/uidna.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  *******************************************************************************
  *
  *   Copyright (C) 2003-2009, International Business Machines
  *   Corporation and others.  All Rights Reserved.
  *
  *******************************************************************************
  *   file name:  uidna.cpp
  *   encoding:   US-ASCII
  *   tab size:   8 (not used)
  *   indentation:4
  *
  *   created on: 2003feb1
  *   created by: Ram Viswanadha
  */
 #include "unicode/utypes.h"
 #if !UCONFIG_NO_IDNA
 #include "unicode/uidna.h"
 #include "unicode/ustring.h"
 #include "unicode/usprep.h"
 #include "punycode.h"
 #include "ustr_imp.h"
 #include "cmemory.h"
 #include "uassert.h"
 #include "sprpimpl.h"
 /* it is official IDNA ACE Prefix is "xn--" */
 static const UChar ACE_PREFIX[] ={ 0x0078,0x006E,0x002d,0x002d } ;
 #define ACE_PREFIX_LENGTH 4
 #define MAX_LABEL_LENGTH 63
 /* The Max length of the labels should not be more than MAX_LABEL_LENGTH */
 #define MAX_LABEL_BUFFER_SIZE 100
 #define MAX_DOMAIN_NAME_LENGTH 255
 /* The Max length of the domain names should not be more than MAX_DOMAIN_NAME_LENGTH */
 #define MAX_IDN_BUFFER_SIZE   MAX_DOMAIN_NAME_LENGTH+1
 #define LOWER_CASE_DELTA 0x0020
 #define HYPHEN           0x002D
 #define FULL_STOP        0x002E
 #define CAPITAL_A        0x0041
 #define CAPITAL_Z        0x005A
 inline static UChar
 toASCIILower(UChar ch){
     if(CAPITAL_A <= ch && ch <= CAPITAL_Z){
         return ch + LOWER_CASE_DELTA;
     }
     return ch;
 }
 inline static UBool
 startsWithPrefix(const UChar* src , int32_t srcLength){
     UBool startsWithPrefix = TRUE;
     if(srcLength < ACE_PREFIX_LENGTH){
         return FALSE;
     }
     for(int8_t i=0; i< ACE_PREFIX_LENGTH; i++){
         if(toASCIILower(src[i]) != ACE_PREFIX[i]){
             startsWithPrefix = FALSE;
         }
     }
     return startsWithPrefix;
 }
 inline static int32_t
 compareCaseInsensitiveASCII(const UChar* s1, int32_t s1Len,
                             const UChar* s2, int32_t s2Len){
     int32_t minLength;
     int32_t lengthResult;
     // are we comparing different lengths?
     if(s1Len != s2Len) {
         if(s1Len < s2Len) {
             minLength = s1Len;
             lengthResult = -1;
         } else {
             minLength = s2Len;
             lengthResult = 1;
         }
     } else {
         // ok the lengths are equal
         minLength = s1Len;
         lengthResult = 0;
     }
     UChar c1,c2;
     int32_t rc;
     for(int32_t i =0;/* no condition */;i++) {
         /* If we reach the ends of both strings then they match */
         if(i == minLength) {
             return lengthResult;
         }
         c1 = s1[i];
         c2 = s2[i];
         /* Case-insensitive comparison */
         if(c1!=c2) {
             rc=(int32_t)toASCIILower(c1)-(int32_t)toASCIILower(c2);
             if(rc!=0) {
                 lengthResult=rc;
                 break;
             }
         }
     }
     return lengthResult;
 }
 /**
  * Ascertain if the given code point is a label separator as
  * defined by the IDNA RFC
  *
  * @param ch The code point to be ascertained
  * @return true if the char is a label separator
  * @stable ICU 2.8
  */
 static inline UBool isLabelSeparator(UChar ch){
     switch(ch){
         case 0x002e:
         case 0x3002:
         case 0xFF0E:
         case 0xFF61:
             return TRUE;
         default:
             return FALSE;
     }
 }
 // returns the length of the label excluding the separator
 // if *limit == separator then the length returned does not include
 // the separtor.
 static inline int32_t
 getNextSeparator(UChar *src, int32_t srcLength,
                  UChar **limit, UBool *done){
     if(srcLength == -1){
         int32_t i;
         for(i=0 ; ;i++){
             if(src[i] == 0){
                 *limit = src + i; // point to null
                 *done = TRUE;
                 return i;
             }
             if(isLabelSeparator(src[i])){
                 *limit = src + (i+1); // go past the delimiter
                 return i;
             }
         }
     }else{
         int32_t i;
         for(i=0;i<srcLength;i++){
             if(isLabelSeparator(src[i])){
                 *limit = src + (i+1); // go past the delimiter
                 return i;
             }
         }
         // we have not found the delimiter
         // if(i==srcLength)
         *limit = src+srcLength;
         *done = TRUE;
         return i;
     }
 }
 static inline UBool isLDHChar(UChar ch){
     // high runner case
     if(ch>0x007A){
         return FALSE;
     }
     //[\\u002D \\u0030-\\u0039 \\u0041-\\u005A \\u0061-\\u007A]
     if( (ch==0x002D) ||
         (0x0030 <= ch && ch <= 0x0039) ||
         (0x0041 <= ch && ch <= 0x005A) ||
         (0x0061 <= ch && ch <= 0x007A)
       ){
         return TRUE;
     }
     return FALSE;
 }
 static int32_t
 _internal_toASCII(const UChar* src, int32_t srcLength,
                   UChar* dest, int32_t destCapacity,
                   int32_t options,
                   UStringPrepProfile* nameprep,
                   UParseError* parseError,
                   UErrorCode* status)
 {
     // TODO Revisit buffer handling. The label should not be over 63 ASCII characters. ICU4J may need to be updated too.
     UChar b1Stack[MAX_LABEL_BUFFER_SIZE], b2Stack[MAX_LABEL_BUFFER_SIZE];
     //initialize pointers to stack buffers
     UChar  *b1 = b1Stack, *b2 = b2Stack;
     int32_t b1Len=0, b2Len,
             b1Capacity = MAX_LABEL_BUFFER_SIZE,
             b2Capacity = MAX_LABEL_BUFFER_SIZE ,
             reqLength=0;
     int32_t namePrepOptions = ((options & UIDNA_ALLOW_UNASSIGNED) != 0) ? USPREP_ALLOW_UNASSIGNED: 0;
     UBool* caseFlags = NULL;
     // the source contains all ascii codepoints
     UBool srcIsASCII  = TRUE;
     // assume the source contains all LDH codepoints
     UBool srcIsLDH = TRUE;
     int32_t j=0;
     //get the options
     UBool useSTD3ASCIIRules = (UBool)((options & UIDNA_USE_STD3_RULES) != 0);
     int32_t failPos = -1;
     if(srcLength == -1){
         srcLength = u_strlen(src);
     }
     if(srcLength > b1Capacity){
         b1 = (UChar*) uprv_malloc(srcLength * U_SIZEOF_UCHAR);
         if(b1==NULL){
             *status = U_MEMORY_ALLOCATION_ERROR;
             goto CLEANUP;
         }
         b1Capacity = srcLength;
     }
     // step 1
     for( j=0;j<srcLength;j++){
         if(src[j] > 0x7F){
             srcIsASCII = FALSE;
         }
         b1[b1Len++] = src[j];
     }
     // step 2 is performed only if the source contains non ASCII
     if(srcIsASCII == FALSE){
         // step 2
         b1Len = usprep_prepare(nameprep, src, srcLength, b1, b1Capacity, namePrepOptions, parseError, status);
         if(*status == U_BUFFER_OVERFLOW_ERROR){
             // redo processing of string
             // we do not have enough room so grow the buffer
             if(b1 != b1Stack){
                 uprv_free(b1);
             }
             b1 = (UChar*) uprv_malloc(b1Len * U_SIZEOF_UCHAR);
             if(b1==NULL){
                 *status = U_MEMORY_ALLOCATION_ERROR;
                 goto CLEANUP;
             }
             *status = U_ZERO_ERROR; // reset error
             b1Len = usprep_prepare(nameprep, src, srcLength, b1, b1Len, namePrepOptions, parseError, status);
         }
     }
     // error bail out
     if(U_FAILURE(*status)){
         goto CLEANUP;
     }
     if(b1Len == 0){
         *status = U_IDNA_ZERO_LENGTH_LABEL_ERROR;
         goto CLEANUP;
     }
     // for step 3 & 4
     srcIsASCII = TRUE;
     for( j=0;j<b1Len;j++){
         // check if output of usprep_prepare is all ASCII
         if(b1[j] > 0x7F){
             srcIsASCII = FALSE;
         }else if(isLDHChar(b1[j])==FALSE){  // if the char is in ASCII range verify that it is an LDH character
             srcIsLDH = FALSE;
             failPos = j;
         }
     }
     if(useSTD3ASCIIRules == TRUE){
         // verify 3a and 3b
         // 3(a) Verify the absence of non-LDH ASCII code points; that is, the
         //  absence of 0..2C, 2E..2F, 3A..40, 5B..60, and 7B..7F.
         // 3(b) Verify the absence of leading and trailing hyphen-minus; that
         //  is, the absence of U+002D at the beginning and end of the
         //  sequence.
         if( srcIsLDH == FALSE /* source at this point should not contain anyLDH characters */
             || b1[0] ==  HYPHEN || b1[b1Len-1] == HYPHEN){
             *status = U_IDNA_STD3_ASCII_RULES_ERROR;
             /* populate the parseError struct */
             if(srcIsLDH==FALSE){
                 // failPos is always set the index of failure
                 uprv_syntaxError(b1,failPos, b1Len,parseError);
             }else if(b1[0] == HYPHEN){
                 // fail position is 0
                 uprv_syntaxError(b1,0,b1Len,parseError);
             }else{
                 // the last index in the source is always length-1
                 uprv_syntaxError(b1, (b1Len>0) ? b1Len-1 : b1Len, b1Len,parseError);
             }
             goto CLEANUP;
         }
     }
     // Step 4: if the source is ASCII then proceed to step 8
     if(srcIsASCII){
         if(b1Len <= destCapacity){
             uprv_memmove(dest, b1, b1Len * U_SIZEOF_UCHAR);
             reqLength = b1Len;
         }else{
             reqLength = b1Len;
             goto CLEANUP;
         }
     }else{
         // step 5 : verify the sequence does not begin with ACE prefix
         if(!startsWithPrefix(b1,b1Len)){
             //step 6: encode the sequence with punycode
             // do not preserve the case flags for now!
             // TODO: Preserve the case while implementing the RFE
             // caseFlags = (UBool*) uprv_malloc(b1Len * sizeof(UBool));
             // uprv_memset(caseFlags,TRUE,b1Len);
             b2Len = u_strToPunycode(b1,b1Len,b2,b2Capacity,caseFlags, status);
             if(*status == U_BUFFER_OVERFLOW_ERROR){
                 // redo processing of string
                 /* we do not have enough room so grow the buffer*/
                 b2 = (UChar*) uprv_malloc(b2Len * U_SIZEOF_UCHAR);
                 if(b2 == NULL){
                     *status = U_MEMORY_ALLOCATION_ERROR;
                     goto CLEANUP;
                 }
                 *status = U_ZERO_ERROR; // reset error
                 b2Len = u_strToPunycode(b1,b1Len,b2,b2Len,caseFlags, status);
             }
             //error bail out
             if(U_FAILURE(*status)){
                 goto CLEANUP;
             }
             // TODO : Reconsider while implementing the case preserve RFE
             // convert all codepoints to lower case ASCII
             // toASCIILower(b2,b2Len);
             reqLength = b2Len+ACE_PREFIX_LENGTH;
             if(reqLength > destCapacity){
                 *status = U_BUFFER_OVERFLOW_ERROR;
                 goto CLEANUP;
             }
             //Step 7: prepend the ACE prefix
             uprv_memcpy(dest,ACE_PREFIX,ACE_PREFIX_LENGTH * U_SIZEOF_UCHAR);
             //Step 6: copy the contents in b2 into dest
             uprv_memcpy(dest+ACE_PREFIX_LENGTH, b2, b2Len * U_SIZEOF_UCHAR);
         }else{
             *status = U_IDNA_ACE_PREFIX_ERROR;
             //position of failure is 0
             uprv_syntaxError(b1,0,b1Len,parseError);
             goto CLEANUP;
         }
     }
     // step 8: verify the length of label
     if(reqLength > MAX_LABEL_LENGTH){
         *status = U_IDNA_LABEL_TOO_LONG_ERROR;
     }
 CLEANUP:
     if(b1 != b1Stack){
         uprv_free(b1);
     }
     if(b2 != b2Stack){
         uprv_free(b2);
     }
     uprv_free(caseFlags);
     return u_terminateUChars(dest, destCapacity, reqLength, status);
 }
 static int32_t
 _internal_toUnicode(const UChar* src, int32_t srcLength,
                     UChar* dest, int32_t destCapacity,
                     int32_t options,
                     UStringPrepProfile* nameprep,
                     UParseError* parseError,
                     UErrorCode* status)
 {
     //get the options
     //UBool useSTD3ASCIIRules = (UBool)((options & UIDNA_USE_STD3_RULES) != 0);
     int32_t namePrepOptions = ((options & UIDNA_ALLOW_UNASSIGNED) != 0) ? USPREP_ALLOW_UNASSIGNED: 0;
     // TODO Revisit buffer handling. The label should not be over 63 ASCII characters. ICU4J may need to be updated too.
     UChar b1Stack[MAX_LABEL_BUFFER_SIZE], b2Stack[MAX_LABEL_BUFFER_SIZE], b3Stack[MAX_LABEL_BUFFER_SIZE];
     //initialize pointers to stack buffers
     UChar  *b1 = b1Stack, *b2 = b2Stack, *b1Prime=NULL, *b3=b3Stack;
     int32_t b1Len, b2Len, b1PrimeLen, b3Len,
             b1Capacity = MAX_LABEL_BUFFER_SIZE,
             b2Capacity = MAX_LABEL_BUFFER_SIZE,
             b3Capacity = MAX_LABEL_BUFFER_SIZE,
             reqLength=0;
     b1Len = 0;
     UBool* caseFlags = NULL;
     UBool srcIsASCII = TRUE;
     /*UBool srcIsLDH = TRUE;
     int32_t failPos =0;*/
     // step 1: find out if all the codepoints in src are ASCII
     if(srcLength==-1){
         srcLength = 0;
         for(;src[srcLength]!=0;){
             if(src[srcLength]> 0x7f){
                 srcIsASCII = FALSE;
             }/*else if(isLDHChar(src[srcLength])==FALSE){
                 // here we do not assemble surrogates
                 // since we know that LDH code points
                 // are in the ASCII range only
                 srcIsLDH = FALSE;
                 failPos = srcLength;
             }*/
             srcLength++;
         }
     }else if(srcLength > 0){
         for(int32_t j=0; j<srcLength; j++){
             if(src[j]> 0x7f){
                 srcIsASCII = FALSE;
             }/*else if(isLDHChar(src[j])==FALSE){
                 // here we do not assemble surrogates
                 // since we know that LDH code points
                 // are in the ASCII range only
                 srcIsLDH = FALSE;
                 failPos = j;
             }*/
         }
     }else{
         return 0;
     }
     if(srcIsASCII == FALSE){
         // step 2: process the string
         b1Len = usprep_prepare(nameprep, src, srcLength, b1, b1Capacity, namePrepOptions, parseError, status);
         if(*status == U_BUFFER_OVERFLOW_ERROR){
             // redo processing of string
             /* we do not have enough room so grow the buffer*/
             b1 = (UChar*) uprv_malloc(b1Len * U_SIZEOF_UCHAR);
             if(b1==NULL){
                 *status = U_MEMORY_ALLOCATION_ERROR;
                 goto CLEANUP;
             }
             *status = U_ZERO_ERROR; // reset error
             b1Len = usprep_prepare(nameprep, src, srcLength, b1, b1Len, namePrepOptions, parseError, status);
         }
         //bail out on error
         if(U_FAILURE(*status)){
             goto CLEANUP;
         }
     }else{
         //just point src to b1
         b1 = (UChar*) src;
         b1Len = srcLength;
     }
     // The RFC states that
     // <quote>
     // ToUnicode never fails. If any step fails, then the original input
     // is returned immediately in that step.
     // </quote>
     //step 3: verify ACE Prefix
     if(startsWithPrefix(b1,b1Len)){
         //step 4: Remove the ACE Prefix
         b1Prime = b1 + ACE_PREFIX_LENGTH;
         b1PrimeLen  = b1Len - ACE_PREFIX_LENGTH;
         //step 5: Decode using punycode
         b2Len = u_strFromPunycode(b1Prime, b1PrimeLen, b2, b2Capacity, caseFlags,status);
         if(*status == U_BUFFER_OVERFLOW_ERROR){
             // redo processing of string
             /* we do not have enough room so grow the buffer*/
             b2 = (UChar*) uprv_malloc(b2Len * U_SIZEOF_UCHAR);
             if(b2==NULL){
                 *status = U_MEMORY_ALLOCATION_ERROR;
                 goto CLEANUP;
             }
             *status = U_ZERO_ERROR; // reset error
             b2Len =  u_strFromPunycode(b1Prime, b1PrimeLen, b2, b2Len, caseFlags, status);
         }
         //step 6:Apply toASCII
         b3Len = uidna_toASCII(b2, b2Len, b3, b3Capacity, options, parseError, status);
         if(*status == U_BUFFER_OVERFLOW_ERROR){
             // redo processing of string
             /* we do not have enough room so grow the buffer*/
             b3 = (UChar*) uprv_malloc(b3Len * U_SIZEOF_UCHAR);
             if(b3==NULL){
                 *status = U_MEMORY_ALLOCATION_ERROR;
                 goto CLEANUP;
             }
             *status = U_ZERO_ERROR; // reset error
             b3Len =  uidna_toASCII(b2,b2Len,b3,b3Len,options,parseError, status);
         }
         //bail out on error
         if(U_FAILURE(*status)){
             goto CLEANUP;
         }
         //step 7: verify
         if(compareCaseInsensitiveASCII(b1, b1Len, b3, b3Len) !=0){
             // Cause the original to be returned.
             *status = U_IDNA_VERIFICATION_ERROR;
             goto CLEANUP;
         }
         //step 8: return output of step 5
         reqLength = b2Len;
         if(b2Len <= destCapacity) {
             uprv_memmove(dest, b2, b2Len * U_SIZEOF_UCHAR);
         }
     }
     else{
         // See the start of this if statement for why this is commented out.
         // verify that STD3 ASCII rules are satisfied
         /*if(useSTD3ASCIIRules == TRUE){
             if( srcIsLDH == FALSE // source contains some non-LDH characters
                 || src[0] ==  HYPHEN || src[srcLength-1] == HYPHEN){
                 *status = U_IDNA_STD3_ASCII_RULES_ERROR;
                 // populate the parseError struct
                 if(srcIsLDH==FALSE){
                     // failPos is always set the index of failure
                     uprv_syntaxError(src,failPos, srcLength,parseError);
                 }else if(src[0] == HYPHEN){
                     // fail position is 0
                     uprv_syntaxError(src,0,srcLength,parseError);
                 }else{
                     // the last index in the source is always length-1
                     uprv_syntaxError(src, (srcLength>0) ? srcLength-1 : srcLength, srcLength,parseError);
                 }
                 goto CLEANUP;
             }
         }*/
         // just return the source
         //copy the source to destination
         if(srcLength <= destCapacity){
             uprv_memmove(dest,src,srcLength * U_SIZEOF_UCHAR);
         }
         reqLength = srcLength;
     }
 CLEANUP:
     if(b1 != b1Stack && b1!=src){
         uprv_free(b1);
     }
     if(b2 != b2Stack){
         uprv_free(b2);
     }
     uprv_free(caseFlags);
     // The RFC states that
     // <quote>
     // ToUnicode never fails. If any step fails, then the original input
     // is returned immediately in that step.
     // </quote>
     // So if any step fails lets copy source to destination
     if(U_FAILURE(*status)){
         //copy the source to destination
         if(dest && srcLength <= destCapacity){
             // srcLength should have already been set earlier.
             U_ASSERT(srcLength >= 0);
             uprv_memmove(dest,src,srcLength * U_SIZEOF_UCHAR);
         }
         reqLength = srcLength;
         *status = U_ZERO_ERROR;
     }
     return u_terminateUChars(dest, destCapacity, reqLength, status);
 }
 U_CAPI int32_t U_EXPORT2
 uidna_toASCII(const UChar* src, int32_t srcLength,
               UChar* dest, int32_t destCapacity,
               int32_t options,
               UParseError* parseError,
               UErrorCode* status){
     if(status == NULL || U_FAILURE(*status)){
         return 0;
     }
     if((src==NULL) || (srcLength < -1) || (destCapacity<0) || (!dest && destCapacity > 0)){
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     UStringPrepProfile* nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, status);
     if(U_FAILURE(*status)){
         return -1;
     }
     int32_t retLen = _internal_toASCII(src, srcLength, dest, destCapacity, options, nameprep, parseError, status);
     /* close the profile*/
     usprep_close(nameprep);
     return retLen;
 }
 U_CAPI int32_t U_EXPORT2
 uidna_toUnicode(const UChar* src, int32_t srcLength,
                 UChar* dest, int32_t destCapacity,
                 int32_t options,
                 UParseError* parseError,
                 UErrorCode* status){
     if(status == NULL || U_FAILURE(*status)){
         return 0;
     }
     if( (src==NULL) || (srcLength < -1) || (destCapacity<0) || (!dest && destCapacity > 0)){
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     UStringPrepProfile* nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, status);
     if(U_FAILURE(*status)){
         return -1;
     }
     int32_t retLen = _internal_toUnicode(src, srcLength, dest, destCapacity, options, nameprep, parseError, status);
     usprep_close(nameprep);
     return retLen;
 }
 U_CAPI int32_t U_EXPORT2
 uidna_IDNToASCII(  const UChar *src, int32_t srcLength,
                    UChar* dest, int32_t destCapacity,
                    int32_t options,
                    UParseError *parseError,
                    UErrorCode *status){
     if(status == NULL || U_FAILURE(*status)){
         return 0;
     }
     if((src==NULL) || (srcLength < -1) || (destCapacity<0) || (!dest && destCapacity > 0)){
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     int32_t reqLength = 0;
     UStringPrepProfile* nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, status);
     if(U_FAILURE(*status)){
         return 0;
     }
     //initialize pointers
     UChar *delimiter = (UChar*)src;
     UChar *labelStart = (UChar*)src;
     UChar *currentDest = (UChar*) dest;
     int32_t remainingLen = srcLength;
     int32_t remainingDestCapacity = destCapacity;
     int32_t labelLen = 0, labelReqLength = 0;
     UBool done = FALSE;
     for(;;){
         labelLen = getNextSeparator(labelStart,remainingLen, &delimiter,&done);
         labelReqLength = 0;
         if(!(labelLen==0 && done)){// make sure this is not a root label separator.
             labelReqLength = _internal_toASCII( labelStart, labelLen,
                                                 currentDest, remainingDestCapacity,
                                                 options, nameprep,
                                                 parseError, status);
             if(*status == U_BUFFER_OVERFLOW_ERROR){
                 *status = U_ZERO_ERROR; // reset error
                 remainingDestCapacity = 0;
             }
         }
         if(U_FAILURE(*status)){
             break;
         }
         reqLength +=labelReqLength;
         // adjust the destination pointer
         if(labelReqLength < remainingDestCapacity){
             currentDest = currentDest + labelReqLength;
             remainingDestCapacity -= labelReqLength;
         }else{
             // should never occur
             remainingDestCapacity = 0;
         }
         if(done == TRUE){
             break;
         }
         // add the label separator
         if(remainingDestCapacity > 0){
             *currentDest++ = FULL_STOP;
             remainingDestCapacity--;
         }
         reqLength++;
         labelStart = delimiter;
         if(remainingLen >0 ){
             remainingLen = (int32_t)(srcLength - (delimiter - src));
         }
     }
     if(reqLength > MAX_DOMAIN_NAME_LENGTH){
         *status = U_IDNA_DOMAIN_NAME_TOO_LONG_ERROR;
     }
     usprep_close(nameprep);
     return u_terminateUChars(dest, destCapacity, reqLength, status);
 }
 U_CAPI int32_t U_EXPORT2
 uidna_IDNToUnicode(  const UChar* src, int32_t srcLength,
                      UChar* dest, int32_t destCapacity,
                      int32_t options,
                      UParseError* parseError,
                      UErrorCode* status){
     if(status == NULL || U_FAILURE(*status)){
         return 0;
     }
     if((src==NULL) || (srcLength < -1) || (destCapacity<0) || (!dest && destCapacity > 0)){
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     int32_t reqLength = 0;
     UStringPrepProfile* nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, status);
     if(U_FAILURE(*status)){
         return 0;
     }
     //initialize pointers
     UChar *delimiter = (UChar*)src;
     UChar *labelStart = (UChar*)src;
     UChar *currentDest = (UChar*) dest;
     int32_t remainingLen = srcLength;
     int32_t remainingDestCapacity = destCapacity;
     int32_t labelLen = 0, labelReqLength = 0;
     UBool done = FALSE;
     for(;;){
         labelLen = getNextSeparator(labelStart,remainingLen, &delimiter,&done);
         // The RFC states that
         // <quote>
         // ToUnicode never fails. If any step fails, then the original input
         // is returned immediately in that step.
         // </quote>
         // _internal_toUnicode will copy the label.
         /*if(labelLen==0 && done==FALSE){
             *status = U_IDNA_ZERO_LENGTH_LABEL_ERROR;
             break;
         }*/
         labelReqLength = _internal_toUnicode(labelStart, labelLen,
                                              currentDest, remainingDestCapacity,
                                              options, nameprep,
                                              parseError, status);
         if(*status == U_BUFFER_OVERFLOW_ERROR){
             *status = U_ZERO_ERROR; // reset error
             remainingDestCapacity = 0;
         }
         if(U_FAILURE(*status)){
             break;
         }
         reqLength +=labelReqLength;
         // adjust the destination pointer
         if(labelReqLength < remainingDestCapacity){
             currentDest = currentDest + labelReqLength;
             remainingDestCapacity -= labelReqLength;
         }else{
             // should never occur
             remainingDestCapacity = 0;
         }
         if(done == TRUE){
             break;
         }
         // add the label separator
         // Unlike the ToASCII operation we don't normalize the label separators
         if(remainingDestCapacity > 0){
             *currentDest++ = *(labelStart + labelLen);
             remainingDestCapacity--;
         }
         reqLength++;
         labelStart = delimiter;
         if(remainingLen >0 ){
             remainingLen = (int32_t)(srcLength - (delimiter - src));
         }
     }
     if(reqLength > MAX_DOMAIN_NAME_LENGTH){
         *status = U_IDNA_DOMAIN_NAME_TOO_LONG_ERROR;
     }
     usprep_close(nameprep);
     return u_terminateUChars(dest, destCapacity, reqLength, status);
 }
 U_CAPI int32_t U_EXPORT2
 uidna_compare(  const UChar *s1, int32_t length1,
                 const UChar *s2, int32_t length2,
                 int32_t options,
                 UErrorCode* status){
     if(status == NULL || U_FAILURE(*status)){
         return -1;
     }
     UChar b1Stack[MAX_IDN_BUFFER_SIZE], b2Stack[MAX_IDN_BUFFER_SIZE];
     UChar *b1 = b1Stack, *b2 = b2Stack;
     int32_t b1Len, b2Len, b1Capacity = MAX_IDN_BUFFER_SIZE, b2Capacity = MAX_IDN_BUFFER_SIZE;
     int32_t result=-1;
     UParseError parseError;
     b1Len = uidna_IDNToASCII(s1, length1, b1, b1Capacity, options, &parseError, status);
     if(*status == U_BUFFER_OVERFLOW_ERROR){
         // redo processing of string
         b1 = (UChar*) uprv_malloc(b1Len * U_SIZEOF_UCHAR);
         if(b1==NULL){
             *status = U_MEMORY_ALLOCATION_ERROR;
             goto CLEANUP;
         }
         *status = U_ZERO_ERROR; // reset error
         b1Len = uidna_IDNToASCII(s1,length1,b1,b1Len, options, &parseError, status);
     }
     b2Len = uidna_IDNToASCII(s2,length2, b2,b2Capacity, options, &parseError, status);
     if(*status == U_BUFFER_OVERFLOW_ERROR){
         // redo processing of string
         b2 = (UChar*) uprv_malloc(b2Len * U_SIZEOF_UCHAR);
         if(b2==NULL){
             *status = U_MEMORY_ALLOCATION_ERROR;
             goto CLEANUP;
         }
         *status = U_ZERO_ERROR; // reset error
         b2Len = uidna_IDNToASCII(s2, length2, b2, b2Len, options, &parseError, status);
     }
     // when toASCII is applied all label separators are replaced with FULL_STOP
     result = compareCaseInsensitiveASCII(b1,b1Len,b2,b2Len);
 CLEANUP:
     if(b1 != b1Stack){
         uprv_free(b1);
     }
     if(b2 != b2Stack){
         uprv_free(b2);
     }
     return result;
 }
 #endif /* #if !UCONFIG_NO_IDNA */

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intl/icu/source/common/uidna.cpp@b8a032363ba2 (annotated)

intl/icu/source/common/uidna.cpp