nsBig5Prober.cpp

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*  -*- C++ -*-
*  Copyright (C) 1998 <developer@mozilla.org>
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#include "nsBig5Prober.h"

namespace kencodingprober {
void  nsBig5Prober::Reset(void)
{
  mCodingSM->Reset(); 
  mState = eDetecting;
  mDistributionAnalyser.Reset();
}

nsProbingState nsBig5Prober::HandleData(const char* aBuf, unsigned int aLen)
{
  nsSMState codingState;

  for (unsigned int i = 0; i < aLen; i++)
  {
    codingState = mCodingSM->NextState(aBuf[i]);
    if (codingState == eError)
    {
      mState = eNotMe;
      break;
    }
    if (codingState == eItsMe)
    {
      mState = eFoundIt;
      break;
    }
    if (codingState == eStart)
    {
      unsigned int charLen = mCodingSM->GetCurrentCharLen();

      if (i == 0)
      {
        mLastChar[1] = aBuf[0];
        mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
      }
      else
        mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
    }
  }

  mLastChar[0] = aBuf[aLen-1];

  if (mState == eDetecting)
    if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
      mState = eFoundIt;

  return mState;
}

float nsBig5Prober::GetConfidence(void)
{
  float distribCf = mDistributionAnalyser.GetConfidence();

  return (float)distribCf;
}
}