Lib.robot.utils.compress.py Maven / Gradle / Ivy

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#  Copyright 2008-2015 Nokia Solutions and Networks
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

import base64
import sys

from .platform import PY2


def compress_text(text):
    result = base64.b64encode(_compress(text.encode('UTF-8')))
    return result if PY2 else result.decode('ASCII')


if not sys.platform.startswith('java'):

    import zlib

    def _compress(text):
        return zlib.compress(text, 9)

else:

    # Custom compress implementation was originally used to avoid memory leak
    # (http://bugs.jython.org/issue1775). Kept around still because it is a bit
    # faster than Jython's standard zlib.compress.

    from java.util.zip import Deflater
    import jarray

    _DEFLATOR = Deflater(9, False)

    def _compress(text):
        _DEFLATOR.setInput(text)
        _DEFLATOR.finish()
        buf = jarray.zeros(1024, 'b')
        compressed = []
        while not _DEFLATOR.finished():
            length = _DEFLATOR.deflate(buf, 0, 1024)
            compressed.append(buf[:length].tostring())
        _DEFLATOR.reset()
        return ''.join(compressed)