mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-05 02:43:37 +00:00
170 lines
6.7 KiB
Python
170 lines
6.7 KiB
Python
######################## BEGIN LICENSE BLOCK ########################
|
|
# The Original Code is Mozilla Universal charset detector code.
|
|
#
|
|
# The Initial Developer of the Original Code is
|
|
# Netscape Communications Corporation.
|
|
# Portions created by the Initial Developer are Copyright (C) 2001
|
|
# the Initial Developer. All Rights Reserved.
|
|
#
|
|
# Contributor(s):
|
|
# Mark Pilgrim - port to Python
|
|
# Shy Shalom - original C code
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the Free Software
|
|
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
|
# 02110-1301 USA
|
|
######################### END LICENSE BLOCK #########################
|
|
|
|
from . import constants
|
|
import sys
|
|
import codecs
|
|
from .latin1prober import Latin1Prober # windows-1252
|
|
from .mbcsgroupprober import MBCSGroupProber # multi-byte character sets
|
|
from .sbcsgroupprober import SBCSGroupProber # single-byte character sets
|
|
from .escprober import EscCharSetProber # ISO-2122, etc.
|
|
import re
|
|
|
|
MINIMUM_THRESHOLD = 0.20
|
|
ePureAscii = 0
|
|
eEscAscii = 1
|
|
eHighbyte = 2
|
|
|
|
|
|
class UniversalDetector:
|
|
def __init__(self):
|
|
self._highBitDetector = re.compile(b'[\x80-\xFF]')
|
|
self._escDetector = re.compile(b'(\033|~{)')
|
|
self._mEscCharSetProber = None
|
|
self._mCharSetProbers = []
|
|
self.reset()
|
|
|
|
def reset(self):
|
|
self.result = {'encoding': None, 'confidence': 0.0}
|
|
self.done = False
|
|
self._mStart = True
|
|
self._mGotData = False
|
|
self._mInputState = ePureAscii
|
|
self._mLastChar = b''
|
|
if self._mEscCharSetProber:
|
|
self._mEscCharSetProber.reset()
|
|
for prober in self._mCharSetProbers:
|
|
prober.reset()
|
|
|
|
def feed(self, aBuf):
|
|
if self.done:
|
|
return
|
|
|
|
aLen = len(aBuf)
|
|
if not aLen:
|
|
return
|
|
|
|
if not self._mGotData:
|
|
# If the data starts with BOM, we know it is UTF
|
|
if aBuf[:3] == codecs.BOM_UTF8:
|
|
# EF BB BF UTF-8 with BOM
|
|
self.result = {'encoding': "UTF-8-SIG", 'confidence': 1.0}
|
|
elif aBuf[:4] == codecs.BOM_UTF32_LE:
|
|
# FF FE 00 00 UTF-32, little-endian BOM
|
|
self.result = {'encoding': "UTF-32LE", 'confidence': 1.0}
|
|
elif aBuf[:4] == codecs.BOM_UTF32_BE:
|
|
# 00 00 FE FF UTF-32, big-endian BOM
|
|
self.result = {'encoding': "UTF-32BE", 'confidence': 1.0}
|
|
elif aBuf[:4] == b'\xFE\xFF\x00\x00':
|
|
# FE FF 00 00 UCS-4, unusual octet order BOM (3412)
|
|
self.result = {
|
|
'encoding': "X-ISO-10646-UCS-4-3412",
|
|
'confidence': 1.0
|
|
}
|
|
elif aBuf[:4] == b'\x00\x00\xFF\xFE':
|
|
# 00 00 FF FE UCS-4, unusual octet order BOM (2143)
|
|
self.result = {
|
|
'encoding': "X-ISO-10646-UCS-4-2143",
|
|
'confidence': 1.0
|
|
}
|
|
elif aBuf[:2] == codecs.BOM_LE:
|
|
# FF FE UTF-16, little endian BOM
|
|
self.result = {'encoding': "UTF-16LE", 'confidence': 1.0}
|
|
elif aBuf[:2] == codecs.BOM_BE:
|
|
# FE FF UTF-16, big endian BOM
|
|
self.result = {'encoding': "UTF-16BE", 'confidence': 1.0}
|
|
|
|
self._mGotData = True
|
|
if self.result['encoding'] and (self.result['confidence'] > 0.0):
|
|
self.done = True
|
|
return
|
|
|
|
if self._mInputState == ePureAscii:
|
|
if self._highBitDetector.search(aBuf):
|
|
self._mInputState = eHighbyte
|
|
elif ((self._mInputState == ePureAscii) and
|
|
self._escDetector.search(self._mLastChar + aBuf)):
|
|
self._mInputState = eEscAscii
|
|
|
|
self._mLastChar = aBuf[-1:]
|
|
|
|
if self._mInputState == eEscAscii:
|
|
if not self._mEscCharSetProber:
|
|
self._mEscCharSetProber = EscCharSetProber()
|
|
if self._mEscCharSetProber.feed(aBuf) == constants.eFoundIt:
|
|
self.result = {'encoding': self._mEscCharSetProber.get_charset_name(),
|
|
'confidence': self._mEscCharSetProber.get_confidence()}
|
|
self.done = True
|
|
elif self._mInputState == eHighbyte:
|
|
if not self._mCharSetProbers:
|
|
self._mCharSetProbers = [MBCSGroupProber(), SBCSGroupProber(),
|
|
Latin1Prober()]
|
|
for prober in self._mCharSetProbers:
|
|
if prober.feed(aBuf) == constants.eFoundIt:
|
|
self.result = {'encoding': prober.get_charset_name(),
|
|
'confidence': prober.get_confidence()}
|
|
self.done = True
|
|
break
|
|
|
|
def close(self):
|
|
if self.done:
|
|
return
|
|
if not self._mGotData:
|
|
if constants._debug:
|
|
sys.stderr.write('no data received!\n')
|
|
return
|
|
self.done = True
|
|
|
|
if self._mInputState == ePureAscii:
|
|
self.result = {'encoding': 'ascii', 'confidence': 1.0}
|
|
return self.result
|
|
|
|
if self._mInputState == eHighbyte:
|
|
proberConfidence = None
|
|
maxProberConfidence = 0.0
|
|
maxProber = None
|
|
for prober in self._mCharSetProbers:
|
|
if not prober:
|
|
continue
|
|
proberConfidence = prober.get_confidence()
|
|
if proberConfidence > maxProberConfidence:
|
|
maxProberConfidence = proberConfidence
|
|
maxProber = prober
|
|
if maxProber and (maxProberConfidence > MINIMUM_THRESHOLD):
|
|
self.result = {'encoding': maxProber.get_charset_name(),
|
|
'confidence': maxProber.get_confidence()}
|
|
return self.result
|
|
|
|
if constants._debug:
|
|
sys.stderr.write('no probers hit minimum threshhold\n')
|
|
for prober in self._mCharSetProbers[0].mProbers:
|
|
if not prober:
|
|
continue
|
|
sys.stderr.write('%s confidence = %s\n' %
|
|
(prober.get_charset_name(),
|
|
prober.get_confidence()))
|