Add 'requests' library to third_party.

third_party/requests/packages/charade/sjisprober.py

+######################## BEGIN LICENSE BLOCK ########################
+# The Original Code is mozilla.org code.
+#
+# The Initial Developer of the Original Code is
+# Netscape Communications Corporation.
+# Portions created by the Initial Developer are Copyright (C) 1998
+# the Initial Developer. All Rights Reserved.
+#
+# Contributor(s):
+#   Mark Pilgrim - port to Python
+#
+# 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 #########################
+
+import sys
+from .mbcharsetprober import MultiByteCharSetProber
+from .codingstatemachine import CodingStateMachine
+from .chardistribution import SJISDistributionAnalysis
+from .jpcntx import SJISContextAnalysis
+from .mbcssm import SJISSMModel
+from . import constants
+
+
+class SJISProber(MultiByteCharSetProber):
+    def __init__(self):
+        MultiByteCharSetProber.__init__(self)
+        self._mCodingSM = CodingStateMachine(SJISSMModel)
+        self._mDistributionAnalyzer = SJISDistributionAnalysis()
+        self._mContextAnalyzer = SJISContextAnalysis()
+        self.reset()
+
+    def reset(self):
+        MultiByteCharSetProber.reset(self)
+        self._mContextAnalyzer.reset()
+
+    def get_charset_name(self):
+        return "SHIFT_JIS"
+
+    def feed(self, aBuf):
+        aLen = len(aBuf)
+        for i in range(0, aLen):
+            codingState = self._mCodingSM.next_state(aBuf[i])
+            if codingState == constants.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 == constants.eItsMe:
+                self._mState = constants.eFoundIt
+                break
+            elif codingState == constants.eStart:
+                charLen = self._mCodingSM.get_current_charlen()
+                if i == 0:
+                    self._mLastChar[1] = aBuf[0]
+                    self._mContextAnalyzer.feed(self._mLastChar[2 - charLen:],
+                                                charLen)
+                    self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
+                else:
+                    self._mContextAnalyzer.feed(aBuf[i + 1 - charLen:i + 3
+                                                     - charLen], charLen)
+                    self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1],
+                                                     charLen)
+
+        self._mLastChar[0] = aBuf[aLen - 1]
+
+        if self.get_state() == constants.eDetecting:
+            if (self._mContextAnalyzer.got_enough_data() and
+               (self.get_confidence() > constants.SHORTCUT_THRESHOLD)):
+                self._mState = constants.eFoundIt
+
+        return self.get_state()
+
+    def get_confidence(self):
+        contxtCf = self._mContextAnalyzer.get_confidence()
+        distribCf = self._mDistributionAnalyzer.get_confidence()
+        return max(contxtCf, distribCf)