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/extensions/universalchardet/src/base/nsBig5Prober.cpp

http://github.com/zpao/v8monkey
C++ | 90 lines | 43 code | 11 blank | 36 comment | 11 complexity | ab4f0aa68eda3bd0f688e424837d9b71 MD5 | raw file
 1/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 2/* ***** BEGIN LICENSE BLOCK *****
 3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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37
38#include "nsBig5Prober.h"
39#include "nsDebug.h"
40
41void  nsBig5Prober::Reset(void)
42{
43  mCodingSM->Reset(); 
44  mState = eDetecting;
45  mDistributionAnalyser.Reset(mIsPreferredLanguage);
46}
47
48nsProbingState nsBig5Prober::HandleData(const char* aBuf, PRUint32 aLen)
49{
50  NS_ASSERTION(aLen, "HandleData called with empty buffer");
51  nsSMState codingState;
52
53  for (PRUint32 i = 0; i < aLen; i++)
54  {
55    codingState = mCodingSM->NextState(aBuf[i]);
56    if (codingState == eItsMe)
57    {
58      mState = eFoundIt;
59      break;
60    }
61    if (codingState == eStart)
62    {
63      PRUint32 charLen = mCodingSM->GetCurrentCharLen();
64
65      if (i == 0)
66      {
67        mLastChar[1] = aBuf[0];
68        mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
69      }
70      else
71        mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
72    }
73  }
74
75  mLastChar[0] = aBuf[aLen-1];
76
77  if (mState == eDetecting)
78    if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
79      mState = eFoundIt;
80
81  return mState;
82}
83
84float nsBig5Prober::GetConfidence(void)
85{
86  float distribCf = mDistributionAnalyser.GetConfidence();
87
88  return (float)distribCf;
89}
90