Aegisub/vendor/universalchardet/nsSBCSGroupProber.cpp
2014-04-06 07:48:20 -07:00

224 lines
6.5 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 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 ***** */
#include <stdio.h>
#include "prmem.h"
#include "nsSBCharSetProber.h"
#include "nsSBCSGroupProber.h"
#include "nsHebrewProber.h"
nsSBCSGroupProber::nsSBCSGroupProber()
{
mProbers[0] = new nsSingleByteCharSetProber(&Win1251Model);
mProbers[1] = new nsSingleByteCharSetProber(&Koi8rModel);
mProbers[2] = new nsSingleByteCharSetProber(&Latin5Model);
mProbers[3] = new nsSingleByteCharSetProber(&MacCyrillicModel);
mProbers[4] = new nsSingleByteCharSetProber(&Ibm866Model);
mProbers[5] = new nsSingleByteCharSetProber(&Ibm855Model);
mProbers[6] = new nsSingleByteCharSetProber(&Latin7Model);
mProbers[7] = new nsSingleByteCharSetProber(&Win1253Model);
mProbers[8] = new nsSingleByteCharSetProber(&Latin5BulgarianModel);
mProbers[9] = new nsSingleByteCharSetProber(&Win1251BulgarianModel);
mProbers[10] = new nsSingleByteCharSetProber(&TIS620ThaiModel);
nsHebrewProber *hebprober = new nsHebrewProber();
// Notice: Any change in these indexes - 10,11,12 must be reflected
// in the code below as well.
mProbers[11] = hebprober;
mProbers[12] = new nsSingleByteCharSetProber(&Win1255Model, PR_FALSE, hebprober); // Logical Hebrew
mProbers[13] = new nsSingleByteCharSetProber(&Win1255Model, PR_TRUE, hebprober); // Visual Hebrew
// Tell the Hebrew prober about the logical and visual probers
if (mProbers[11] && mProbers[12] && mProbers[13]) // all are not null
{
hebprober->SetModelProbers(mProbers[12], mProbers[13]);
}
else // One or more is null. avoid any Hebrew probing, null them all
{
for (PRUint32 i = 11; i <= 13; ++i)
{
delete mProbers[i];
mProbers[i] = 0;
}
}
// disable latin2 before latin1 is available, otherwise all latin1
// will be detected as latin2 because of their similarity.
//mProbers[10] = new nsSingleByteCharSetProber(&Latin2HungarianModel);
//mProbers[11] = new nsSingleByteCharSetProber(&Win1250HungarianModel);
Reset();
}
nsSBCSGroupProber::~nsSBCSGroupProber()
{
for (PRUint32 i = 0; i < NUM_OF_SBCS_PROBERS; i++)
{
delete mProbers[i];
}
}
const char* nsSBCSGroupProber::GetCharSetName()
{
//if we have no answer yet
if (mBestGuess == -1)
{
GetConfidence();
//no charset seems positive
if (mBestGuess == -1)
//we will use default.
mBestGuess = 0;
}
return mProbers[mBestGuess]->GetCharSetName();
}
void nsSBCSGroupProber::Reset(void)
{
mActiveNum = 0;
for (PRUint32 i = 0; i < NUM_OF_SBCS_PROBERS; i++)
{
if (mProbers[i]) // not null
{
mProbers[i]->Reset();
mIsActive[i] = PR_TRUE;
++mActiveNum;
}
else
mIsActive[i] = PR_FALSE;
}
mBestGuess = -1;
mState = eDetecting;
}
nsProbingState nsSBCSGroupProber::HandleData(const char* aBuf, PRUint32 aLen)
{
nsProbingState st;
PRUint32 i;
char *newBuf1 = 0;
PRUint32 newLen1 = 0;
//apply filter to original buffer, and we got new buffer back
//depend on what script it is, we will feed them the new buffer
//we got after applying proper filter
//this is done without any consideration to KeepEnglishLetters
//of each prober since as of now, there are no probers here which
//recognize languages with English characters.
if (!FilterWithoutEnglishLetters(aBuf, aLen, &newBuf1, newLen1))
goto done;
if (newLen1 == 0)
goto done; // Nothing to see here, move on.
for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
{
if (!mIsActive[i])
continue;
st = mProbers[i]->HandleData(newBuf1, newLen1);
if (st == eFoundIt)
{
mBestGuess = i;
mState = eFoundIt;
break;
}
else if (st == eNotMe)
{
mIsActive[i] = PR_FALSE;
mActiveNum--;
if (mActiveNum <= 0)
{
mState = eNotMe;
break;
}
}
}
done:
PR_FREEIF(newBuf1);
return mState;
}
float nsSBCSGroupProber::GetConfidence(void)
{
PRUint32 i;
float bestConf = 0.0, cf;
switch (mState)
{
case eFoundIt:
return (float)0.99; //sure yes
case eNotMe:
return (float)0.01; //sure no
default:
for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
{
if (!mIsActive[i])
continue;
cf = mProbers[i]->GetConfidence();
if (bestConf < cf)
{
bestConf = cf;
mBestGuess = i;
}
}
}
return bestConf;
}
#ifdef DEBUG_chardet
void nsSBCSGroupProber::DumpStatus()
{
PRUint32 i;
float cf;
cf = GetConfidence();
printf(" SBCS Group Prober --------begin status \r\n");
for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
{
if (!mIsActive[i])
printf(" inactive: [%s] (i.e. confidence is too low).\r\n", mProbers[i]->GetCharSetName());
else
mProbers[i]->DumpStatus();
}
printf(" SBCS Group found best match [%s] confidence %f.\r\n",
mProbers[mBestGuess]->GetCharSetName(), cf);
}
#endif