File indexing completed on 2024-06-02 04:53:37

 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  * for the specific language governing rights and limitations under the
  * License.
  *
  * The Original Code is Mozilla Universal charset detector code.
  *
  * The Initial Developer of the Original Code is
  * Netscape Communications Corporation.
  * Portions created by the Initial Developer are Copyright (C) 2001
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
  *          Shy Shalom <shooshX@gmail.com>
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  * in which case the provisions of the GPL or the LGPL are applicable instead
  * of those above. If you wish to allow use of your version of this file only
  * under the terms of either the GPL or the LGPL, and not to allow others to
  * use your version of this file under the terms of the MPL, indicate your
  * decision by deleting the provisions above and replace them with the notice
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 
 #pragma GCC visibility push(hidden)
 
 #include "nsCharSetProber.h"
 #include "prmem.h"
 
 //This filter applies to all scripts which do not use English characters
 PRBool nsCharSetProber::FilterWithoutEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
 {
   char *newptr;
   char *prevPtr, *curPtr;
   
   PRBool meetMSB = PR_FALSE;   
   newptr = *newBuf = (char*)PR_Malloc(aLen);
   if (!newptr)
     return PR_FALSE;
 
   for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
   {
     if (*curPtr & 0x80)
     {
       meetMSB = PR_TRUE;
     }
     else if (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') 
     {
       //current char is a symbol, most likely a punctuation. we treat it as segment delimiter
       if (meetMSB && curPtr > prevPtr) 
       //this segment contains more than single symbol, and it has upper ASCII, we need to keep it
       {
         while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
         prevPtr++;
         *newptr++ = ' ';
         meetMSB = PR_FALSE;
       }
       else //ignore current segment. (either because it is just a symbol or just an English word)
         prevPtr = curPtr+1;
     }
   }
   if (meetMSB && curPtr > prevPtr) 
     while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
 
   newLen = newptr - *newBuf;
 
   return PR_TRUE;
 }
 
 //This filter applies to all scripts which contain both English characters and upper ASCII characters.
 PRBool nsCharSetProber::FilterWithEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
 {
   //do filtering to reduce load to probers
   char *newptr;
   char *prevPtr, *curPtr;
   PRBool isInTag = PR_FALSE;
 
   newptr = *newBuf = (char*)PR_Malloc(aLen);
   if (!newptr)
     return PR_FALSE;
 
   for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
   {
     if (*curPtr == '>')
       isInTag = PR_FALSE;
     else if (*curPtr == '<')
       isInTag = PR_TRUE;
 
     if (!(*curPtr & 0x80) &&
         (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') )
     {
       if (curPtr > prevPtr && !isInTag) // Current segment contains more than just a symbol 
                                         // and it is not inside a tag, keep it.
       {
         while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
         prevPtr++;
         *newptr++ = ' ';
       }
       else
         prevPtr = curPtr+1;
     }
   }
 
   // If the current segment contains more than just a symbol 
   // and it is not inside a tag then keep it.
   if (!isInTag)
     while (prevPtr < curPtr)
       *newptr++ = *prevPtr++;  
 
   newLen = newptr - *newBuf;
 
   return PR_TRUE;
 }
 
 #pragma GCC visibility pop