compress.py

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#  Copyright 2008-2015 Nokia Networks
#  Copyright 2016-     Robot Framework Foundation
#
#  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
 
from .platform import JYTHON, PY2
 
 
def compress_text(text):
    result = base64.b64encode(_compress(text.encode('UTF-8')))
    return result if PY2 else result.decode('ASCII')
 
 
if not JYTHON:
 
    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)