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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 "JapaneseGroupProber.h"
#include "UnicodeGroupProber.h"
#include "nsSJISProber.h"
#include "nsEUCJPProber.h"
#include <stdio.h>
#include <stdlib.h>
namespace qencodingprober {
#ifdef DEBUG_PROBE
static const char* const ProberName[] =
{
"Unicode",
"GB18030",
"Big5",
};
#endif
JapaneseGroupProber::JapaneseGroupProber()
{
mProbers[0] = new UnicodeGroupProber();
mProbers[1] = new nsSJISProber();
mProbers[2] = new nsEUCJPProber();
Reset();
}
JapaneseGroupProber::~JapaneseGroupProber()
{
for (unsigned int i = 0; i < JP_NUM_OF_PROBERS; i++)
{
delete mProbers[i];
}
}
const char* JapaneseGroupProber::GetCharSetName()
{
if (mBestGuess == -1)
{
GetConfidence();
if (mBestGuess == -1)
mBestGuess = 1; // assume it's GB18030
}
return mProbers[mBestGuess]->GetCharSetName();
}
void JapaneseGroupProber::Reset(void)
{
mActiveNum = 0;
for (unsigned int i = 0; i < JP_NUM_OF_PROBERS; i++)
{
if (mProbers[i])
{
mProbers[i]->Reset();
mIsActive[i] = true;
++mActiveNum;
}
else
mIsActive[i] = false;
}
mBestGuess = -1;
mState = eDetecting;
}
nsProbingState JapaneseGroupProber::HandleData(const char* aBuf, unsigned int aLen)
{
nsProbingState st;
unsigned int i;
//do filtering to reduce load to probers
char *highbyteBuf;
char *hptr;
bool keepNext = true; //assume previous is not ascii, it will do no harm except add some noise
hptr = highbyteBuf = (char*)malloc(aLen);
if (!hptr)
return mState;
for (i = 0; i < aLen; ++i)
{
if (aBuf[i] & 0x80)
{
*hptr++ = aBuf[i];
keepNext = true;
}
else
{
//if previous is highbyte, keep this even it is a ASCII
if (keepNext)
{
*hptr++ = aBuf[i];
keepNext = false;
}
}
}
for (i = 0; i < JP_NUM_OF_PROBERS; ++i)
{
if (!mIsActive[i])
continue;
st = mProbers[i]->HandleData(highbyteBuf, hptr - highbyteBuf);
if (st == eFoundIt)
{
mBestGuess = i;
mState = eFoundIt;
break;
}
else if (st == eNotMe)
{
mIsActive[i] = false;
mActiveNum--;
if (mActiveNum <= 0)
{
mState = eNotMe;
break;
}
}
}
free(highbyteBuf);
return mState;
}
float JapaneseGroupProber::GetConfidence(void)
{
unsigned int i;
float bestConf = 0.0, cf;
switch (mState)
{
case eFoundIt:
return (float)0.99;
case eNotMe:
return (float)0.01;
default:
for (i = 0; i < JP_NUM_OF_PROBERS; ++i)
{
if (!mIsActive[i])
continue;
cf = mProbers[i]->GetConfidence();
if (bestConf < cf)
{
bestConf = cf;
mBestGuess = i;
}
}
}
return bestConf;
}
#ifdef DEBUG_PROBE
void JapaneseGroupProber::DumpStatus()
{
unsigned int i;
float cf;
GetConfidence();
for (i = 0; i < JP_NUM_OF_PROBERS; i++)
{
if (!mIsActive[i])
printf(" Chinese group inactive: [%s] (confidence is too low).\r\n", ProberName[i]);
else
{
cf = mProbers[i]->GetConfidence();
printf(" Chinese group %1.3f: [%s]\r\n", cf, ProberName[i]);
}
}
}
#endif
}
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