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  • Committer: Jelmer Vernooij
  • Date: 2017-06-08 23:30:31 UTC
  • mto: This revision was merged to the branch mainline in revision 6690.
  • Revision ID: jelmer@jelmer.uk-20170608233031-3qavls2o7a1pqllj
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breezy/tuned_gzip.py
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"""Legacy breezy specific gzip tunings."""
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from __future__ import absolute_import
 
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import struct
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import zlib
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__all__ = ["chunks_to_gzip"]
 
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__all__ = ["bytes_to_gzip", "chunks_to_gzip"]
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def U32(i):
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    return i & 0xFFFFFFFF
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def bytes_to_gzip(bytes, factory=zlib.compressobj,
 
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    level=zlib.Z_DEFAULT_COMPRESSION, method=zlib.DEFLATED,
 
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    width=-zlib.MAX_WBITS, mem=zlib.DEF_MEM_LEVEL,
 
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    crc32=zlib.crc32):
 
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    """Create a gzip file containing bytes and return its content."""
 
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    return chunks_to_gzip([bytes])
 
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def chunks_to_gzip(chunks, factory=zlib.compressobj,
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                   level=zlib.Z_DEFAULT_COMPRESSION, method=zlib.DEFLATED,
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                   width=-zlib.MAX_WBITS, mem=zlib.DEF_MEM_LEVEL,
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                   crc32=zlib.crc32):
 
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    level=zlib.Z_DEFAULT_COMPRESSION, method=zlib.DEFLATED,
 
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    width=-zlib.MAX_WBITS, mem=zlib.DEF_MEM_LEVEL,
 
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    crc32=zlib.crc32):
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    """Create a gzip file containing chunks and return its content.
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    :param chunks: An iterable of strings. Each string can have arbitrary
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        b'\002'      # self.fileobj.write('\002')
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        b'\377'      # self.fileobj.write('\377')
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                     # if fname:
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        b''  # self.fileobj.write(fname + '\000')
 
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        b''          #     self.fileobj.write(fname + '\000')
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        ]
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    # using a compressobj avoids a small header and trailer that the compress()
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    # utility function adds.
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    result.append(compress.flush())
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    # size may exceed 2GB, or even 4GB
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    result.append(struct.pack("<LL", LOWU32(crc), LOWU32(total_len)))
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    return result
 
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    return b''.join(result)