from constants import eStart, eError, eItsMe
from charsetprober import CharSetProber
class MultiByteCharSetProber(CharSetProber):
def __init__(self):
CharSetProber.__init__(self)
self._mDistributionAnalyzer = None
self._mCodingSM = None
self._mLastChar = ['\x00', '\x00']
def reset(self):
CharSetProber.reset(self)
if self._mCodingSM:
self._mCodingSM.reset()
if self._mDistributionAnalyzer:
self._mDistributionAnalyzer.reset()
self._mLastChar = ['\x00', '\x00']
def get_charset_name(self):
pass
def feed(self, aBuf):
aLen = len(aBuf)
for i in range(0, aLen):
codingState = self._mCodingSM.next_state(aBuf[i])
if codingState == eError:
if constants._debug:
sys.stderr.write(self.get_charset_name() + ' prober hit error at byte ' + str(i) + '\n')
self._mState = constants.eNotMe
break
elif codingState == eItsMe:
self._mState = constants.eFoundIt
break
elif codingState == eStart:
charLen = self._mCodingSM.get_current_charlen()
if i == 0:
self._mLastChar[1] = aBuf[0]
self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
else:
self._mDistributionAnalyzer.feed(aBuf[i-1:i+1], charLen)
self._mLastChar[0] = aBuf[aLen - 1]
if self.get_state() == constants.eDetecting:
if self._mDistributionAnalyzer.got_enough_data() and \
(self.get_confidence() > constants.SHORTCUT_THRESHOLD):
self._mState = constants.eFoundIt
return self.get_state()