forked from mia/Aegisub
87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
/* -*- 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.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* 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 ***** */
|
|
|
|
#include "nsUTF8Prober.h"
|
|
|
|
void nsUTF8Prober::Reset(void)
|
|
{
|
|
mCodingSM->Reset();
|
|
mNumOfMBChar = 0;
|
|
mState = eDetecting;
|
|
}
|
|
|
|
nsProbingState nsUTF8Prober::HandleData(const char* aBuf, PRUint32 aLen)
|
|
{
|
|
nsSMState codingState;
|
|
|
|
for (PRUint32 i = 0; i < aLen; i++)
|
|
{
|
|
codingState = mCodingSM->NextState(aBuf[i]);
|
|
if (codingState == eItsMe)
|
|
{
|
|
mState = eFoundIt;
|
|
break;
|
|
}
|
|
if (codingState == eStart)
|
|
{
|
|
if (mCodingSM->GetCurrentCharLen() >= 2)
|
|
mNumOfMBChar++;
|
|
}
|
|
}
|
|
|
|
if (mState == eDetecting)
|
|
if (GetConfidence() > SHORTCUT_THRESHOLD)
|
|
mState = eFoundIt;
|
|
return mState;
|
|
}
|
|
|
|
#define ONE_CHAR_PROB (float)0.50
|
|
|
|
float nsUTF8Prober::GetConfidence(void)
|
|
{
|
|
float unlike = (float)0.99;
|
|
|
|
if (mNumOfMBChar < 6)
|
|
{
|
|
for (PRUint32 i = 0; i < mNumOfMBChar; i++)
|
|
unlike *= ONE_CHAR_PROB;
|
|
return (float)1.0 - unlike;
|
|
}
|
|
else
|
|
return (float)0.99;
|
|
}
|
|
|