Source code for pysparkling.fileio.codec.sevenz

from __future__ import absolute_import

    import py7zlib
except ImportError:
    py7zlib = None

from io import BytesIO
import logging

from .codec import Codec

log = logging.getLogger(__name__)

[docs]class SevenZ(Codec): """Implementation of :class:`.Codec` for 7z compression. Needs the `pylzma` module. """ def __init__(self): if py7zlib is None: log.warning('py7zlib could not be imported. To read 7z files, ' 'install the library with "pip install pylzma".') super(SevenZ, self).__init__()
[docs] def compress(self, stream): log.warning('Writing of 7z compressed archives is not supported.') return stream
[docs] def decompress(self, stream): if py7zlib is None: return Codec.decompress(self, stream) uncompressed = BytesIO() f = py7zlib.Archive7z(file=stream) for f_name in f.getnames(): uncompressed.write(f.getmember(f_name).read()) return uncompressed