Aegisub/aegisub/universalchardet/nsEscCharsetProber.cpp

108 lines
3.4 KiB
C++

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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*
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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#include "nsEscCharsetProber.h"
nsEscCharSetProber::nsEscCharSetProber(void)
{
mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
mActiveSM = NUM_OF_ESC_CHARSETS;
mState = eDetecting;
mDetectedCharset = nsnull;
}
nsEscCharSetProber::~nsEscCharSetProber(void)
{
for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
delete mCodingSM[i];
}
void nsEscCharSetProber::Reset(void)
{
mState = eDetecting;
for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
mCodingSM[i]->Reset();
mActiveSM = NUM_OF_ESC_CHARSETS;
mDetectedCharset = nsnull;
}
nsProbingState nsEscCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
{
nsSMState codingState;
PRInt32 j;
PRUint32 i;
for ( i = 0; i < aLen && mState == eDetecting; 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 != (PRInt32)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;
}
}
}
return mState;
}