Beispiel #1
0
    def mask(self, data):
        """
        Performs the masking or unmasking operation on data
        using the simple masking algorithm:

        ..
           j                   = i MOD 4
           transformed-octet-i = original-octet-i XOR masking-key-octet-j

        """
        masked = bytearray(data)
        if py3k: key = self.masking_key
        else: key = map(ord, self.masking_key)
        for i in range(len(data)):
            masked[i] = masked[i] ^ key[i%4]
        return masked
Beispiel #2
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    def mask(self, data):
        """
        Performs the masking or unmasking operation on data
        using the simple masking algorithm:

        ..
           j                   = i MOD 4
           transformed-octet-i = original-octet-i XOR masking-key-octet-j

        """
        masked = bytearray(data)
        if py3k: key = self.masking_key
        else: key = map(ord, self.masking_key)
        for i in range(len(data)):
            masked[i] = masked[i] ^ key[i%4]
        return masked
Beispiel #3
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    def validate(self, ba):
        """
      Incrementally validate a chunk of bytes provided as bytearray.

      Will return a quad (valid?, endsOnCodePoint?, currentIndex, totalIndex).

      As soon as an octet is encountered which renders the octet sequence
      invalid, a quad with valid? == False is returned. currentIndex returns
      the index within the currently consumed chunk, and totalIndex the
      index within the total consumed sequence that was the point of bail out.
      When valid? == True, currentIndex will be len(ba) and totalIndex the
      total amount of consumed bytes.
      """
        l = len(ba)
        for i in range(0, l):
            ## optimized version of decode(), since we are not interested in actual code points
            self.state = Utf8Validator.UTF8VALIDATOR_DFA[256 + (
                self.state << 4) + Utf8Validator.UTF8VALIDATOR_DFA[ba[i]]]
            if self.state == Utf8Validator.UTF8_REJECT:
                self.i += i
                return False, False, i, self.i
        self.i += l
        return True, self.state == Utf8Validator.UTF8_ACCEPT, l, self.i
    def validate(self, ba):
        """
      Incrementally validate a chunk of bytes provided as bytearray.

      Will return a quad (valid?, endsOnCodePoint?, currentIndex, totalIndex).

      As soon as an octet is encountered which renders the octet sequence
      invalid, a quad with valid? == False is returned. currentIndex returns
      the index within the currently consumed chunk, and totalIndex the
      index within the total consumed sequence that was the point of bail out.
      When valid? == True, currentIndex will be len(ba) and totalIndex the
      total amount of consumed bytes.
      """
        l = len(ba)
        for i in range(0, l):
            ## optimized version of decode(), since we are not interested in actual code points
            self.state = Utf8Validator.UTF8VALIDATOR_DFA[
                256 + (self.state << 4) + Utf8Validator.UTF8VALIDATOR_DFA[ba[i]]
            ]
            if self.state == Utf8Validator.UTF8_REJECT:
                self.i += i
                return False, False, i, self.i
        self.i += l
        return True, self.state == Utf8Validator.UTF8_ACCEPT, l, self.i