LCOV - code coverage report
Current view: directory - extensions/universalchardet/src/base - nsCharSetProber.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 40 0 0.0 %
Date: 2012-06-02 Functions: 2 0 0.0 %

       1                 : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Universal charset detector code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *          Shy Shalom <shooshX@gmail.com>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 :  
      39                 : #include "nsCharSetProber.h"
      40                 : #include "prmem.h"
      41                 : 
      42                 : //This filter applies to all scripts which do not use English characters
      43               0 : bool nsCharSetProber::FilterWithoutEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
      44                 : {
      45                 :   char *newptr;
      46                 :   char *prevPtr, *curPtr;
      47                 :   
      48               0 :   bool meetMSB = false;   
      49               0 :   newptr = *newBuf = (char*)PR_Malloc(aLen);
      50               0 :   if (!newptr)
      51               0 :     return false;
      52                 : 
      53               0 :   for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
      54                 :   {
      55               0 :     if (*curPtr & 0x80)
      56                 :     {
      57               0 :       meetMSB = true;
      58                 :     }
      59               0 :     else if (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') 
      60                 :     {
      61                 :       //current char is a symbol, most likely a punctuation. we treat it as segment delimiter
      62               0 :       if (meetMSB && curPtr > prevPtr) 
      63                 :       //this segment contains more than single symbol, and it has upper ASCII, we need to keep it
      64                 :       {
      65               0 :         while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
      66               0 :         prevPtr++;
      67               0 :         *newptr++ = ' ';
      68               0 :         meetMSB = false;
      69                 :       }
      70                 :       else //ignore current segment. (either because it is just a symbol or just an English word)
      71               0 :         prevPtr = curPtr+1;
      72                 :     }
      73                 :   }
      74               0 :   if (meetMSB && curPtr > prevPtr) 
      75               0 :     while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
      76                 : 
      77               0 :   newLen = newptr - *newBuf;
      78                 : 
      79               0 :   return true;
      80                 : }
      81                 : 
      82                 : //This filter applies to all scripts which contain both English characters and upper ASCII characters.
      83               0 : bool nsCharSetProber::FilterWithEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen)
      84                 : {
      85                 :   //do filtering to reduce load to probers
      86                 :   char *newptr;
      87                 :   char *prevPtr, *curPtr;
      88               0 :   bool isInTag = false;
      89                 : 
      90               0 :   newptr = *newBuf = (char*)PR_Malloc(aLen);
      91               0 :   if (!newptr)
      92               0 :     return false;
      93                 : 
      94               0 :   for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; curPtr++)
      95                 :   {
      96               0 :     if (*curPtr == '>')
      97               0 :       isInTag = false;
      98               0 :     else if (*curPtr == '<')
      99               0 :       isInTag = true;
     100                 : 
     101               0 :     if (!(*curPtr & 0x80) &&
     102                 :         (*curPtr < 'A' || (*curPtr > 'Z' && *curPtr < 'a') || *curPtr > 'z') )
     103                 :     {
     104               0 :       if (curPtr > prevPtr && !isInTag) // Current segment contains more than just a symbol 
     105                 :                                         // and it is not inside a tag, keep it.
     106                 :       {
     107               0 :         while (prevPtr < curPtr) *newptr++ = *prevPtr++;  
     108               0 :         prevPtr++;
     109               0 :         *newptr++ = ' ';
     110                 :       }
     111                 :       else
     112               0 :         prevPtr = curPtr+1;
     113                 :     }
     114                 :   }
     115                 : 
     116                 :   // If the current segment contains more than just a symbol 
     117                 :   // and it is not inside a tag then keep it.
     118               0 :   if (!isInTag)
     119               0 :     while (prevPtr < curPtr)
     120               0 :       *newptr++ = *prevPtr++;  
     121                 : 
     122               0 :   newLen = newptr - *newBuf;
     123                 : 
     124               0 :   return true;
     125                 : }

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