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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* -*- C++ -*-
* Copyright (C) 2008 <wkai@gmail.com>
*
*
* 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 "UnicodeGroupProber.h"
#include "ctype_test_p.h"
#include <QtAlgorithms>
#include <math.h>
namespace qencodingprober {
UnicodeGroupProber::UnicodeGroupProber(void)
{
mCodingSM[0] = new nsCodingStateMachine(&UTF8SMModel);
mCodingSM[1] = new nsCodingStateMachine(&UCS2LESMModel);
mCodingSM[2] = new nsCodingStateMachine(&UCS2BESMModel);
mActiveSM = NUM_OF_UNICODE_CHARSETS;
mState = eDetecting;
mDetectedCharset = "UTF-8";
}
UnicodeGroupProber::~UnicodeGroupProber(void)
{
for (unsigned int i = 0; i < NUM_OF_UNICODE_CHARSETS; i++)
delete mCodingSM[i];
}
void UnicodeGroupProber::Reset(void)
{
mState = eDetecting;
for (unsigned int i = 0; i < NUM_OF_UNICODE_CHARSETS; i++)
mCodingSM[i]->Reset();
mActiveSM = NUM_OF_UNICODE_CHARSETS;
mDetectedCharset = "UTF-8";
}
nsProbingState UnicodeGroupProber::HandleData(const char* aBuf, unsigned int aLen)
{
nsSMState codingState;
int j;
uint i, weight_BOM, counts[5];
static bool disableUTF16LE = false;
static bool disableUTF16BE = false;
double weight_zero;
if (mActiveSM <= 0) {
mState = eNotMe;
return mState;
}
if (! (disableUTF16LE || disableUTF16BE)) {
if (aLen%2 != 0) {
disableUTF16LE = true;
disableUTF16BE = true;
}
weight_BOM = (uint)(sqrt((double)aLen) + aLen/10.0);
for (uint i = 0; i < 5; i++) {
counts[i] = std::count(aBuf, aBuf + aLen, char(i));
}
weight_zero = (2.0*(counts[0] + counts[1] + counts[2] + counts[3] + counts[4]) + weight_BOM)/aLen;
if (weight_zero < log(1.4142)) {
disableUTF16LE = true;
disableUTF16BE = true;
}
if (4 >= aBuf[1] && aBuf[1] >= 0 && isprint(aBuf[0]))
disableUTF16BE = true;
else
disableUTF16LE = true;
if (disableUTF16BE)
mActiveSM--;
if (disableUTF16LE) {
nsCodingStateMachine* t;
t = mCodingSM[1];
mCodingSM[1] = mCodingSM[2];
mCodingSM[2] = t;
mActiveSM--;
}
}
for (i = 0; i < aLen; ++i) {
for (j = mActiveSM-1; j>= 0; --j)
{
//byte is feed to all active state machine
codingState = mCodingSM[j]->NextState(aBuf[i]);
if (codingState == eError)
{
//got negative answer for this state machine, make it inactive
mActiveSM--;
if (mActiveSM == 0)
{
mState = eNotMe;
return mState;
}
else if (j != (int)mActiveSM)
{
nsCodingStateMachine* t;
t = mCodingSM[mActiveSM];
mCodingSM[mActiveSM] = mCodingSM[j];
mCodingSM[j] = t;
}
}
else if (codingState == eItsMe)
{
mState = eFoundIt;
mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
return mState;
} else if (mState == eDetecting)
mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();;
}
}
return mState;
}
float UnicodeGroupProber::GetConfidence()
{
if (mState == eFoundIt)
return 0.99f;
else
return 0.0f;
}
#ifdef DEBUG_PROBE
void UnicodeGroupProber::DumpStatus()
{
GetConfidence();
for (uint i = 0; i < mActiveSM; i++)
{
kDebug(180) << "Unicode group" << mCodingSM[i]->DumpCurrentState() << mCodingSM[i]->GetCodingStateMachine() ;
}
}
#endif
}
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