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37 :
38 : // for S-JIS encoding, obeserve characteristic:
39 : // 1, kana character (or hankaku?) often have hight frequency of appereance
40 : // 2, kana character often exist in group
41 : // 3, certain combination of kana is never used in japanese language
42 :
43 : #include "nsGB2312Prober.h"
44 : #include "nsDebug.h"
45 :
46 0 : void nsGB18030Prober::Reset(void)
47 : {
48 0 : mCodingSM->Reset();
49 0 : mState = eDetecting;
50 0 : mDistributionAnalyser.Reset(mIsPreferredLanguage);
51 : //mContextAnalyser.Reset();
52 0 : }
53 :
54 0 : nsProbingState nsGB18030Prober::HandleData(const char* aBuf, PRUint32 aLen)
55 : {
56 0 : NS_ASSERTION(aLen, "HandleData called with empty buffer");
57 : nsSMState codingState;
58 :
59 0 : for (PRUint32 i = 0; i < aLen; i++)
60 : {
61 0 : codingState = mCodingSM->NextState(aBuf[i]);
62 0 : if (codingState == eItsMe)
63 : {
64 0 : mState = eFoundIt;
65 0 : break;
66 : }
67 0 : if (codingState == eStart)
68 : {
69 0 : PRUint32 charLen = mCodingSM->GetCurrentCharLen();
70 :
71 0 : if (i == 0)
72 : {
73 0 : mLastChar[1] = aBuf[0];
74 0 : mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
75 : }
76 : else
77 0 : mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
78 : }
79 : }
80 :
81 0 : mLastChar[0] = aBuf[aLen-1];
82 :
83 0 : if (mState == eDetecting)
84 0 : if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
85 0 : mState = eFoundIt;
86 : // else
87 : // mDistributionAnalyser.HandleData(aBuf, aLen);
88 :
89 0 : return mState;
90 : }
91 :
92 0 : float nsGB18030Prober::GetConfidence(void)
93 : {
94 0 : float distribCf = mDistributionAnalyser.GetConfidence();
95 :
96 0 : return (float)distribCf;
97 : }
98 :
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