The Tor Browser: xpcom/string/src/nsStringObsolete.cpp@129ffea94266 (annotated)

xpcom/string/src/nsStringObsolete.cpp@129ffea94266 (annotated)

xpcom/string/src/nsStringObsolete.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et cindent: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsString.h"
   /**
    * nsTString obsolete API support
    */
 #if MOZ_STRING_WITH_OBSOLETE_API
 #include "nsDependentString.h"
 #include "nsDependentSubstring.h"
 #include "nsReadableUtils.h"
 #include "nsCRT.h"
 #include "nsUTF8Utils.h"
 #include "prdtoa.h"
 /* ***** BEGIN RICKG BLOCK *****
  *
  * NOTE: This section of code was extracted from rickg's bufferRoutines.h file.
  *       For the most part it remains unmodified.  We want to eliminate (or at
  *       least clean up) this code at some point.  If you find the formatting
  *       in this section somewhat inconsistent, don't blame me! ;-)
  */
 // avoid STDC's tolower since it may do weird things with non-ASCII bytes
 inline char
 ascii_tolower(char aChar)
 {
   if (aChar >= 'A' && aChar <= 'Z')
     return aChar + ('a' - 'A');
   return aChar;
 }
 //-----------------------------------------------------------------------------
 //
 //  This set of methods is used to search a buffer looking for a char.
 //
 /**
  *  This methods cans the given buffer for the given char
  *
  *  @update  gess 02/17/00
  *  @param   aDest is the buffer to be searched
  *  @param   aDestLength is the size (in char-units, not bytes) of the buffer
  *  @param   anOffset is the start pos to begin searching
  *  @param   aChar is the target character we're looking for
  *  @param   aCount tells us how many characters to iterate through (which may be different than aLength); -1 means use full length.
  *  @return  index of pos if found, else -1 (kNotFound)
  */
 static int32_t
 FindChar1(const char* aDest,uint32_t aDestLength,int32_t anOffset,const char16_t aChar,int32_t aCount) {
   if(anOffset < 0)
     anOffset=0;
   if(aCount < 0)
     aCount = (int32_t)aDestLength;
   if((aChar < 256) && (0 < aDestLength) && ((uint32_t)anOffset < aDestLength)) {
     //We'll only search if the given aChar is within the normal ascii a range,
     //(Since this string is definitely within the ascii range).
     if(0<aCount) {
       const char* left= aDest+anOffset;
       const char* last= left+aCount;
       const char* max = aDest+aDestLength;
       const char* end = (last<max) ? last : max;
       int32_t theMax = end-left;
       if(0<theMax) {
         unsigned char theChar = (unsigned char) aChar;
         const char* result=(const char*)memchr(left, (int)theChar, theMax);
         if(result)
           return result-aDest;
       }
     }
   }
   return kNotFound;
 }
 /**
  *  This methods cans the given buffer for the given char
  *
  *  @update  gess 3/25/98
  *  @param   aDest is the buffer to be searched
  *  @param   aDestLength is the size (in char-units, not bytes) of the buffer
  *  @param   anOffset is the start pos to begin searching
  *  @param   aChar is the target character we're looking for
  *  @param   aCount tells us how many characters to iterate through (which may be different than aLength); -1 means use full length.
  *  @return  index of pos if found, else -1 (kNotFound)
  */
 static int32_t
 FindChar2(const char16_t* aDest,uint32_t aDestLength,int32_t anOffset,const char16_t aChar,int32_t aCount) {
   if(anOffset < 0)
     anOffset=0;
   if(aCount < 0)
     aCount = (int32_t)aDestLength;
   if((0<aDestLength) && ((uint32_t)anOffset < aDestLength)) {
     if(0<aCount) {
       const char16_t* root = aDest;
       const char16_t* left = root+anOffset;
       const char16_t* last = left+aCount;
       const char16_t* max  = root+aDestLength;
       const char16_t* end  = (last<max) ? last : max;
       while(left<end){
         if(*left==aChar)
           return (left-root);
         ++left;
       }
     }
   }
   return kNotFound;
 }
 /**
  *  This methods cans the given buffer (in reverse) for the given char
  *
  *  @update  gess 02/17/00
  *  @param   aDest is the buffer to be searched
  *  @param   aDestLength is the size (in char-units, not bytes) of the buffer
  *  @param   anOffset is the start pos to begin searching
  *  @param   aChar is the target character we're looking for
  *  @param   aCount tells us how many characters to iterate through (which may be different than aLength); -1 means use full length.
  *  @return  index of pos if found, else -1 (kNotFound)
  */
 static int32_t
 RFindChar1(const char* aDest,uint32_t aDestLength,int32_t anOffset,const char16_t aChar,int32_t aCount) {
   if(anOffset < 0)
     anOffset=(int32_t)aDestLength-1;
   if(aCount < 0)
     aCount = int32_t(aDestLength);
   if((aChar<256) && (0 < aDestLength) && ((uint32_t)anOffset < aDestLength)) {
     //We'll only search if the given aChar is within the normal ascii a range,
     //(Since this string is definitely within the ascii range).
     if(0 < aCount) {
       const char* rightmost = aDest + anOffset;
       const char* min       = rightmost - aCount + 1;
       const char* leftmost  = (min<aDest) ? aDest: min;
       char theChar=(char)aChar;
       while(leftmost <= rightmost){
         if((*rightmost) == theChar)
           return rightmost - aDest;
         --rightmost;
       }
     }
   }
   return kNotFound;
 }
 /**
  *  This methods cans the given buffer for the given char
  *
  *  @update  gess 3/25/98
  *  @param   aDest is the buffer to be searched
  *  @param   aDestLength is the size (in char-units, not bytes) of the buffer
  *  @param   anOffset is the start pos to begin searching
  *  @param   aChar is the target character we're looking for
  *  @param   aCount tells us how many characters to iterate through (which may be different than aLength); -1 means use full length.
  *  @return  index of pos if found, else -1 (kNotFound)
  */
 static int32_t
 RFindChar2(const char16_t* aDest,uint32_t aDestLength,int32_t anOffset,const char16_t aChar,int32_t aCount) {
   if(anOffset < 0)
     anOffset=(int32_t)aDestLength-1;
   if(aCount < 0)
     aCount = int32_t(aDestLength);
   if((0 < aDestLength) && ((uint32_t)anOffset < aDestLength)) {
     if(0 < aCount) {
       const char16_t* root      = aDest;
       const char16_t* rightmost = root + anOffset;
       const char16_t* min       = rightmost - aCount + 1;
       const char16_t* leftmost  = (min<root) ? root: min;
       while(leftmost <= rightmost){
         if((*rightmost) == aChar)
           return rightmost - root;
         --rightmost;
       }
     }
   }
   return kNotFound;
 }
 //-----------------------------------------------------------------------------
 //
 //  This set of methods is used to compare one buffer onto another.  The
 //  functions are differentiated by the size of source and dest character
 //  sizes.  WARNING: Your destination buffer MUST be big enough to hold all the
 //  source bytes.  We don't validate these ranges here (this should be done in
 //  higher level routines).
 //
 /**
  * This method compares the data in one buffer with another
  * @update	gess 01/04/99
  * @param   aStr1 is the first buffer to be compared
  * @param   aStr2 is the 2nd buffer to be compared
  * @param   aCount is the number of chars to compare
  * @param   aIgnoreCase tells us whether to use a case-sensitive comparison
  * @return  -1,0,1 depending on <,==,>
  */
 static
 #ifdef __SUNPRO_CC
 inline
 #endif /* __SUNPRO_CC */
 int32_t
 Compare1To1(const char* aStr1,const char* aStr2,uint32_t aCount,bool aIgnoreCase){
   int32_t result=0;
   if(aIgnoreCase)
     result=int32_t(PL_strncasecmp(aStr1, aStr2, aCount));
   else
     result=nsCharTraits<char>::compare(aStr1,aStr2,aCount);
       // alien comparisons may return out-of-bound answers
       //  instead of the -1, 0, 1 expected by most clients
   if ( result < -1 )
     result = -1;
   else if ( result > 1 )
     result = 1;
   return result;
 }
 /**
  * This method compares the data in one buffer with another
  * @update	gess 01/04/99
  * @param   aStr1 is the first buffer to be compared
  * @param   aStr2 is the 2nd buffer to be compared
  * @param   aCount is the number of chars to compare
  * @param   aIgnoreCase tells us whether to use a case-sensitive comparison
  * @return  -1,0,1 depending on <,==,>
  */
 static
 #ifdef __SUNPRO_CC
 inline
 #endif /* __SUNPRO_CC */
 int32_t
 Compare2To2(const char16_t* aStr1,const char16_t* aStr2,uint32_t aCount){
   int32_t result;
   if ( aStr1 && aStr2 )
     result = nsCharTraits<char16_t>::compare(aStr1, aStr2, aCount);
       // The following cases are rare and survivable caller errors.
       //  Two null pointers are equal, but any string, even 0 length
       //  is greater than a null pointer.  It might not really matter,
       //  but we pick something reasonable anyway.
   else if ( !aStr1 && !aStr2 )
     result = 0;
   else if ( aStr1 )
     result = 1;
   else
     result = -1;
       // alien comparisons may give answers outside the -1, 0, 1 expected by callers
   if ( result < -1 )
     result = -1;
   else if ( result > 1 )
     result = 1;
   return result;
 }
 /**
  * This method compares the data in one buffer with another
  * @update	gess 01/04/99
  * @param   aStr1 is the first buffer to be compared
  * @param   aStr2 is the 2nd buffer to be compared
  * @param   aCount is the number of chars to compare
  * @param   aIgnoreCase tells us whether to use a case-sensitive comparison
  * @return  -1,0,1 depending on <,==,>
  */
 static
 #ifdef __SUNPRO_CC
 inline
 #endif /* __SUNPRO_CC */
 int32_t
 Compare2To1(const char16_t* aStr1,const char* aStr2,uint32_t aCount,bool aIgnoreCase){
   const char16_t* s1 = aStr1;
   const char *s2 = aStr2;
   if (aStr1 && aStr2) {
     if (aCount != 0) {
       do {
         char16_t c1 = *s1++;
         char16_t c2 = char16_t((unsigned char)*s2++);
         if (c1 != c2) {
 #ifdef DEBUG
           // we won't warn on c1>=128 (the 2-byte value) because often
           // it is just fine to compare an constant, ascii value (i.e. "body")
           // against some non-ascii value (i.e. a unicode string that
           // was downloaded from a web page)
           if (aIgnoreCase && c2>=128)
             NS_WARNING("got a non-ASCII string, but we can't do an accurate case conversion!");
 #endif
           // can't do case conversion on characters out of our range
           if (aIgnoreCase && c1<128 && c2<128) {
               c1 = ascii_tolower(char(c1));
               c2 = ascii_tolower(char(c2));
               if (c1 == c2) continue;
           }
           if (c1 < c2) return -1;
           return 1;
         }
       } while (--aCount);
     }
   }
   return 0;
 }
 /**
  * This method compares the data in one buffer with another
  * @update	gess 01/04/99
  * @param   aStr1 is the first buffer to be compared
  * @param   aStr2 is the 2nd buffer to be compared
  * @param   aCount is the number of chars to compare
  * @param   aIgnoreCase tells us whether to use a case-sensitive comparison
  * @return  -1,0,1 depending on <,==,>
  */
 inline int32_t
 Compare1To2(const char* aStr1,const char16_t* aStr2,uint32_t aCount,bool aIgnoreCase){
   return Compare2To1(aStr2, aStr1, aCount, aIgnoreCase) * -1;
 }
 //-----------------------------------------------------------------------------
 //
 //  This set of methods is used compress char sequences in a buffer...
 //
 /**
  * This method compresses duplicate runs of a given char from the given buffer
  *
  * @update	rickg 03.23.2000
  * @param   aString is the buffer to be manipulated
  * @param   aLength is the length of the buffer
  * @param   aSet tells us which chars to compress from given buffer
  * @param   aEliminateLeading tells us whether to strip chars from the start of the buffer
  * @param   aEliminateTrailing tells us whether to strip chars from the start of the buffer
  * @return  the new length of the given buffer
  */
 static int32_t
 CompressChars1(char* aString,uint32_t aLength,const char* aSet){
   char*  from = aString;
   char*  end =  aString + aLength;
   char*  to = from;
     //this code converts /n, /t, /r into normal space ' ';
     //it also compresses runs of whitespace down to a single char...
   if(aSet && aString && (0 < aLength)){
     uint32_t aSetLen=strlen(aSet);
     while (from < end) {
       char theChar = *from++;
       *to++=theChar; //always copy this char...
       if((kNotFound!=FindChar1(aSet,aSetLen,0,theChar,aSetLen))){
         while (from < end) {
           theChar = *from++;
           if(kNotFound==FindChar1(aSet,aSetLen,0,theChar,aSetLen)){
             *to++ = theChar;
             break;
           }
         } //while
       } //if
     } //if
     *to = 0;
   }
   return to - aString;
 }
 /**
  * This method compresses duplicate runs of a given char from the given buffer
  *
  * @update	rickg 03.23.2000
  * @param   aString is the buffer to be manipulated
  * @param   aLength is the length of the buffer
  * @param   aSet tells us which chars to compress from given buffer
  * @param   aEliminateLeading tells us whether to strip chars from the start of the buffer
  * @param   aEliminateTrailing tells us whether to strip chars from the start of the buffer
  * @return  the new length of the given buffer
  */
 static int32_t
 CompressChars2(char16_t* aString,uint32_t aLength,const char* aSet){
   char16_t*  from = aString;
   char16_t*  end =  from + aLength;
   char16_t*  to = from;
     //this code converts /n, /t, /r into normal space ' ';
     //it also compresses runs of whitespace down to a single char...
   if(aSet && aString && (0 < aLength)){
     uint32_t aSetLen=strlen(aSet);
     while (from < end) {
       char16_t theChar = *from++;
       *to++=theChar; //always copy this char...
       if((theChar<256) && (kNotFound!=FindChar1(aSet,aSetLen,0,theChar,aSetLen))){
         while (from < end) {
           theChar = *from++;
           if(kNotFound==FindChar1(aSet,aSetLen,0,theChar,aSetLen)){
             *to++ = theChar;
             break;
           }
         } //while
       } //if
     } //if
     *to = 0;
   }
   return to - (char16_t*)aString;
 }
 /**
  * This method strips chars in a given set from the given buffer
  *
  * @update	gess 01/04/99
  * @param   aString is the buffer to be manipulated
  * @param   aLength is the length of the buffer
  * @param   aSet tells us which chars to compress from given buffer
  * @param   aEliminateLeading tells us whether to strip chars from the start of the buffer
  * @param   aEliminateTrailing tells us whether to strip chars from the start of the buffer
  * @return  the new length of the given buffer
  */
 static int32_t
 StripChars1(char* aString,uint32_t aLength,const char* aSet){
   // XXX(darin): this code should defer writing until necessary.
   char*  to   = aString;
   char*  from = aString-1;
   char*  end  = aString + aLength;
   if(aSet && aString && (0 < aLength)){
     uint32_t aSetLen=strlen(aSet);
     while (++from < end) {
       char theChar = *from;
       if(kNotFound==FindChar1(aSet,aSetLen,0,theChar,aSetLen)){
         *to++ = theChar;
       }
     }
     *to = 0;
   }
   return to - (char*)aString;
 }
 /**
  * This method strips chars in a given set from the given buffer
  *
  * @update	gess 01/04/99
  * @param   aString is the buffer to be manipulated
  * @param   aLength is the length of the buffer
  * @param   aSet tells us which chars to compress from given buffer
  * @param   aEliminateLeading tells us whether to strip chars from the start of the buffer
  * @param   aEliminateTrailing tells us whether to strip chars from the start of the buffer
  * @return  the new length of the given buffer
  */
 static int32_t
 StripChars2(char16_t* aString,uint32_t aLength,const char* aSet){
   // XXX(darin): this code should defer writing until necessary.
   char16_t*  to   = aString;
   char16_t*  from = aString-1;
   char16_t*  end  = to + aLength;
   if(aSet && aString && (0 < aLength)){
     uint32_t aSetLen=strlen(aSet);
     while (++from < end) {
       char16_t theChar = *from;
       //Note the test for ascii range below. If you have a real unicode char,
       //and you're searching for chars in the (given) ascii string, there's no
       //point in doing the real search since it's out of the ascii range.
       if((255<theChar) || (kNotFound==FindChar1(aSet,aSetLen,0,theChar,aSetLen))){
         *to++ = theChar;
       }
     }
     *to = 0;
   }
   return to - (char16_t*)aString;
 }
 /* ***** END RICKG BLOCK ***** */
 static const char* kWhitespace="\b\t\r\n ";
 // This function is used to implement FindCharInSet and friends
 template <class CharT>
 #ifndef __SUNPRO_CC
 static
 #endif /* !__SUNPRO_CC */
 CharT
 GetFindInSetFilter( const CharT* set)
   {
     CharT filter = ~CharT(0); // All bits set
     while (*set) {
       filter &= ~(*set);
       ++set;
     }
     return filter;
   }
 // This template class is used by our code to access rickg's buffer routines.
 template <class CharT> struct nsBufferRoutines {};
 template <>
 struct nsBufferRoutines<char>
   {
     static
     int32_t compare( const char* a, const char* b, uint32_t max, bool ic )
       {
         return Compare1To1(a, b, max, ic);
       }
     static
     int32_t compare( const char* a, const char16_t* b, uint32_t max, bool ic )
       {
         return Compare1To2(a, b, max, ic);
       }
     static
     int32_t find_char( const char* s, uint32_t max, int32_t offset, const char16_t c, int32_t count )
       {
         return FindChar1(s, max, offset, c, count);
       }
     static
     int32_t rfind_char( const char* s, uint32_t max, int32_t offset, const char16_t c, int32_t count )
       {
         return RFindChar1(s, max, offset, c, count);
       }
     static
     char get_find_in_set_filter( const char* set )
       {
         return GetFindInSetFilter(set);
       }
     static
     int32_t strip_chars( char* s, uint32_t len, const char* set )
       {
         return StripChars1(s, len, set);
       }
     static
     int32_t compress_chars( char* s, uint32_t len, const char* set )
       {
         return CompressChars1(s, len, set);
       }
   };
 template <>
 struct nsBufferRoutines<char16_t>
   {
     static
     int32_t compare( const char16_t* a, const char16_t* b, uint32_t max, bool ic )
       {
         NS_ASSERTION(!ic, "no case-insensitive compare here");
         return Compare2To2(a, b, max);
       }
     static
     int32_t compare( const char16_t* a, const char* b, uint32_t max, bool ic )
       {
         return Compare2To1(a, b, max, ic);
       }
     static
     int32_t find_char( const char16_t* s, uint32_t max, int32_t offset, const char16_t c, int32_t count )
       {
         return FindChar2(s, max, offset, c, count);
       }
     static
     int32_t rfind_char( const char16_t* s, uint32_t max, int32_t offset, const char16_t c, int32_t count )
       {
         return RFindChar2(s, max, offset, c, count);
       }
     static
     char16_t get_find_in_set_filter( const char16_t* set )
       {
         return GetFindInSetFilter(set);
       }
     static
     char16_t get_find_in_set_filter( const char* set )
       {
         return (~char16_t(0)^~char(0)) | GetFindInSetFilter(set);
       }
     static
     int32_t strip_chars( char16_t* s, uint32_t max, const char* set )
       {
         return StripChars2(s, max, set);
       }
     static
     int32_t compress_chars( char16_t* s, uint32_t len, const char* set )
       {
         return CompressChars2(s, len, set);
       }
   };
 //-----------------------------------------------------------------------------
 template <class L, class R>
 #ifndef __SUNPRO_CC
 static
 #endif /* !__SUNPRO_CC */
 int32_t
 FindSubstring( const L* big, uint32_t bigLen,
                const R* little, uint32_t littleLen,
                bool ignoreCase )
   {
     if (littleLen > bigLen)
       return kNotFound;
     int32_t i, max = int32_t(bigLen - littleLen);
     for (i=0; i<=max; ++i, ++big)
       {
         if (nsBufferRoutines<L>::compare(big, little, littleLen, ignoreCase) == 0)
           return i;
       }
     return kNotFound;
   }
 template <class L, class R>
 #ifndef __SUNPRO_CC
 static
 #endif /* !__SUNPRO_CC */
 int32_t
 RFindSubstring( const L* big, uint32_t bigLen,
                 const R* little, uint32_t littleLen,
                 bool ignoreCase )
   {
     if (littleLen > bigLen)
       return kNotFound;
     int32_t i, max = int32_t(bigLen - littleLen);
     const L* iter = big + max;
     for (i=max; iter >= big; --i, --iter)
       {
         if (nsBufferRoutines<L>::compare(iter, little, littleLen, ignoreCase) == 0)
           return i;
       }
     return kNotFound;
   }
 template <class CharT, class SetCharT>
 #ifndef __SUNPRO_CC
 static
 #endif /* !__SUNPRO_CC */
 int32_t
 FindCharInSet( const CharT* data, uint32_t dataLen, const SetCharT* set )
   {
     CharT filter = nsBufferRoutines<CharT>::get_find_in_set_filter(set);
     const CharT* end = data + dataLen;
     for (const CharT* iter = data; iter < end; ++iter)
       {
         CharT currentChar = *iter;
         if (currentChar & filter)
           continue; // char is not in filter set; go on with next char.
         // test all chars
         const SetCharT* charInSet = set;
         CharT setChar = CharT(*charInSet);
         while (setChar)
           {
             if (setChar == currentChar)
               return iter - data; // found it!  return index of the found char.
             setChar = CharT(*(++charInSet));
           }
       }
     return kNotFound;
   }
 template <class CharT, class SetCharT>
 #ifndef __SUNPRO_CC
 static
 #endif /* !__SUNPRO_CC */
 int32_t
 RFindCharInSet( const CharT* data, uint32_t dataLen, const SetCharT* set )
   {
     CharT filter = nsBufferRoutines<CharT>::get_find_in_set_filter(set);
     for (const CharT* iter = data + dataLen - 1; iter >= data; --iter)
       {
         CharT currentChar = *iter;
         if (currentChar & filter)
           continue; // char is not in filter set; go on with next char.
         // test all chars
         const CharT* charInSet = set;
         CharT setChar = *charInSet;
         while (setChar)
           {
             if (setChar == currentChar)
               return iter - data; // found it!  return index of the found char.
             setChar = *(++charInSet);
           }
       }
     return kNotFound;
   }
   /**
    * this method changes the meaning of |offset| and |count|:
    *
    * upon return,
    *   |offset| specifies start of search range
    *   |count| specifies length of search range
    */
 static void
 Find_ComputeSearchRange( uint32_t bigLen, uint32_t littleLen, int32_t& offset, int32_t& count )
   {
     // |count| specifies how many iterations to make from |offset|
     if (offset < 0)
       {
         offset = 0;
       }
     else if (uint32_t(offset) > bigLen)
       {
         count = 0;
         return;
       }
     int32_t maxCount = bigLen - offset;
     if (count < 0 || count > maxCount)
       {
         count = maxCount;
       }
     else
       {
         count += littleLen;
         if (count > maxCount)
           count = maxCount;
       }
   }
   /**
    * this method changes the meaning of |offset| and |count|:
    *
    * upon entry,
    *   |offset| specifies the end point from which to search backwards
    *   |count| specifies the number of iterations from |offset|
    *
    * upon return,
    *   |offset| specifies start of search range
    *   |count| specifies length of search range
    *
    *
    * EXAMPLE
    *
    *                            + -- littleLen=4 -- +
    *                            :                   :
    *   |____|____|____|____|____|____|____|____|____|____|____|____|
    *                            :                                  :
    *                         offset=5                           bigLen=12
    *
    *   if count = 4, then we expect this function to return offset = 2 and
    *   count = 7.
    *
    */
 static void
 RFind_ComputeSearchRange( uint32_t bigLen, uint32_t littleLen, int32_t& offset, int32_t& count )
   {
     if (littleLen > bigLen)
       {
         offset = 0;
         count = 0;
         return;
       }
     if (offset < 0)
       offset = bigLen - littleLen;
     if (count < 0)
       count = offset + 1;
     int32_t start = offset - count + 1;
     if (start < 0)
       start = 0;
     count = offset + littleLen - start;
     offset = start;
   }
 //-----------------------------------------------------------------------------
   // define nsString obsolete methods
 #include "string-template-def-unichar.h"
 #include "nsTStringObsolete.cpp"
 #include "string-template-undef.h"
   // define nsCString obsolete methods
 #include "string-template-def-char.h"
 #include "nsTStringObsolete.cpp"
 #include "string-template-undef.h"
 //-----------------------------------------------------------------------------
 // specialized methods:
 int32_t
 nsString::Find( const nsAFlatString& aString, int32_t aOffset, int32_t aCount ) const
   {
     // this method changes the meaning of aOffset and aCount:
     Find_ComputeSearchRange(mLength, aString.Length(), aOffset, aCount);
     int32_t result = FindSubstring(mData + aOffset, aCount, static_cast<const char16_t*>(aString.get()), aString.Length(), false);
     if (result != kNotFound)
       result += aOffset;
     return result;
   }
 int32_t
 nsString::Find( const char16_t* aString, int32_t aOffset, int32_t aCount ) const
   {
     return Find(nsDependentString(aString), aOffset, aCount);
   }
 int32_t
 nsString::RFind( const nsAFlatString& aString, int32_t aOffset, int32_t aCount ) const
   {
     // this method changes the meaning of aOffset and aCount:
     RFind_ComputeSearchRange(mLength, aString.Length(), aOffset, aCount);
     int32_t result = RFindSubstring(mData + aOffset, aCount, static_cast<const char16_t*>(aString.get()), aString.Length(), false);
     if (result != kNotFound)
       result += aOffset;
     return result;
   }
 int32_t
 nsString::RFind( const char16_t* aString, int32_t aOffset, int32_t aCount ) const
   {
     return RFind(nsDependentString(aString), aOffset, aCount);
   }
 int32_t
 nsString::FindCharInSet( const char16_t* aSet, int32_t aOffset ) const
   {
     if (aOffset < 0)
       aOffset = 0;
     else if (aOffset >= int32_t(mLength))
       return kNotFound;
     int32_t result = ::FindCharInSet(mData + aOffset, mLength - aOffset, aSet);
     if (result != kNotFound)
       result += aOffset;
     return result;
   }
 void
 nsString::ReplaceChar( const char16_t* aSet, char16_t aNewChar )
   {
     if (!EnsureMutable()) // XXX do this lazily?
       NS_ABORT_OOM(mLength);
     char16_t* data = mData;
     uint32_t lenRemaining = mLength;
     while (lenRemaining)
       {
         int32_t i = ::FindCharInSet(data, lenRemaining, aSet);
         if (i == kNotFound)
           break;
         data[i++] = aNewChar;
         data += i;
         lenRemaining -= i;
       }
   }
   /**
    * nsTString::Compare,CompareWithConversion,etc.
    */
 int32_t
 nsCString::Compare( const char* aString, bool aIgnoreCase, int32_t aCount ) const
   {
     uint32_t strLen = char_traits::length(aString);
     int32_t maxCount = int32_t(XPCOM_MIN(mLength, strLen));
     int32_t compareCount;
     if (aCount < 0 || aCount > maxCount)
       compareCount = maxCount;
     else
       compareCount = aCount;
     int32_t result =
         nsBufferRoutines<char>::compare(mData, aString, compareCount, aIgnoreCase);
     if (result == 0 &&
           (aCount < 0 || strLen < uint32_t(aCount) || mLength < uint32_t(aCount)))
       {
         // Since the caller didn't give us a length to test, or strings shorter
         // than aCount, and compareCount characters matched, we have to assume
         // that the longer string is greater.
         if (mLength != strLen)
           result = (mLength < strLen) ? -1 : 1;
       }
     return result;
   }
 bool
 nsString::EqualsIgnoreCase( const char* aString, int32_t aCount ) const
   {
     uint32_t strLen = nsCharTraits<char>::length(aString);
     int32_t maxCount = int32_t(XPCOM_MIN(mLength, strLen));
     int32_t compareCount;
     if (aCount < 0 || aCount > maxCount)
       compareCount = maxCount;
     else
       compareCount = aCount;
     int32_t result =
         nsBufferRoutines<char16_t>::compare(mData, aString, compareCount, true);
     if (result == 0 &&
           (aCount < 0 || strLen < uint32_t(aCount) || mLength < uint32_t(aCount)))
       {
         // Since the caller didn't give us a length to test, or strings shorter
         // than aCount, and compareCount characters matched, we have to assume
         // that the longer string is greater.
         if (mLength != strLen)
           result = 1; // Arbitrarily using any number != 0
       }
     return result == 0;
   }
   /**
    * nsTString::ToDouble
    */
 double
 nsCString::ToDouble(nsresult* aErrorCode) const
   {
     double res = 0.0;
     if (mLength > 0)
       {
         char *conv_stopped;
         const char *str = mData;
         // Use PR_strtod, not strtod, since we don't want locale involved.
         res = PR_strtod(str, &conv_stopped);
         if (conv_stopped == str+mLength)
           *aErrorCode = NS_OK;
         else // Not all the string was scanned
           *aErrorCode = NS_ERROR_ILLEGAL_VALUE;
       }
     else
       {
         // The string was too short (0 characters)
         *aErrorCode = NS_ERROR_ILLEGAL_VALUE;
       }
     return res;
   }
 double
 nsString::ToDouble(nsresult* aErrorCode) const
   {
     return NS_LossyConvertUTF16toASCII(*this).ToDouble(aErrorCode);
   }
   /**
    * nsTString::AssignWithConversion
    */
 void
 nsCString::AssignWithConversion( const nsAString& aData )
   {
     LossyCopyUTF16toASCII(aData, *this);
   }
 void
 nsString::AssignWithConversion( const nsACString& aData )
   {
     CopyASCIItoUTF16(aData, *this);
   }
 #endif // !MOZ_STRING_WITH_OBSOLETE_API

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xpcom/string/src/nsStringObsolete.cpp@129ffea94266 (annotated)

xpcom/string/src/nsStringObsolete.cpp