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lightning-sunbird  0.9+nobinonly
nsEscCharsetProber.cpp
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00002 /* ***** BEGIN LICENSE BLOCK *****
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00037 
00038 
00039 #include "nsEscCharsetProber.h"
00040 
00041 nsEscCharSetProber::nsEscCharSetProber(void)
00042 {
00043   mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
00044   mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
00045   mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
00046   mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
00047   mActiveSM = NUM_OF_ESC_CHARSETS;
00048   mState = eDetecting;
00049   mDetectedCharset = nsnull;
00050 }
00051 
00052 nsEscCharSetProber::~nsEscCharSetProber(void)
00053 {
00054   for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
00055     delete mCodingSM[i];
00056 }
00057 
00058 void nsEscCharSetProber::Reset(void)
00059 {
00060   mState = eDetecting;
00061   for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
00062     mCodingSM[i]->Reset();
00063   mActiveSM = NUM_OF_ESC_CHARSETS;
00064   mDetectedCharset = nsnull;
00065 }
00066 
00067 nsProbingState nsEscCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
00068 {
00069   nsSMState codingState;
00070   PRInt32 j;
00071   PRUint32 i;
00072 
00073   for ( i = 0; i < aLen && mState == eDetecting; i++)
00074   {
00075     for (j = mActiveSM-1; j>= 0; j--)
00076     {
00077       //byte is feed to all active state machine 
00078       codingState = mCodingSM[j]->NextState(aBuf[i]);
00079       if (codingState == eError)
00080       {
00081         //got negative answer for this state machine, make it inactive
00082         mActiveSM--;
00083         if (mActiveSM == 0)
00084         {
00085           mState = eNotMe;
00086           return mState;
00087         }
00088         else if (j != (PRInt32)mActiveSM)
00089         {
00090           nsCodingStateMachine* t;
00091           t = mCodingSM[mActiveSM];
00092           mCodingSM[mActiveSM] = mCodingSM[j];
00093           mCodingSM[j] = t;
00094         }
00095       }
00096       else if (codingState == eItsMe)
00097       {
00098         mState = eFoundIt;
00099         mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
00100         return mState;
00101       }
00102     }
00103   }
00104 
00105   return mState;
00106 }
00107