Add 'requests' library to third_party.

third_party/requests/packages/charade/universaldetector.py

+######################## 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:
+                # EF BB BF  UTF-8 with BOM
+                self.result = {'encoding': "UTF-8", '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()))