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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* -*- C++ -*-
* Copyright (C) 1998 <developer@mozilla.org>
*
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "nsCharSetProber.h"
#include <stdlib.h>
namespace qencodingprober {
//This filter applies to all scripts which do not use English characters
bool nsCharSetProber::FilterWithoutEnglishLetters(const char* aBuf, unsigned int aLen, char** newBuf, unsigned int& newLen)
{
char *newptr;
char *prevPtr, *curPtr;
bool meetMSB = false;
newptr = *newBuf = (char*)malloc(aLen);
if (!newptr)
return false;
for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; ++curPtr)
{
if (*curPtr & 0x80)
{
meetMSB = 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 = 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 true;
}
//This filter applies to all scripts which contain both English characters and upper ASCII characters.
bool nsCharSetProber::FilterWithEnglishLetters(const char* aBuf, unsigned int aLen, char** newBuf, unsigned int& newLen)
{
//do filtering to reduce load to probers
char *newptr;
char *prevPtr, *curPtr;
bool isInTag = false;
newptr = *newBuf = (char*)malloc(aLen);
if (!newptr)
return false;
for (curPtr = prevPtr = (char*)aBuf; curPtr < aBuf+aLen; ++curPtr)
{
if (*curPtr == '>')
isInTag = false;
else if (*curPtr == '<')
isInTag = 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 true;
}
}
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