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Viewing changes to bzrlib/chunk_writer.py

  • Committer: Canonical.com Patch Queue Manager
  • Date: 2010-10-05 21:15:13 UTC
  • mfrom: (5448.3.5 374700-Add-gnu-lsh-support)
  • Revision ID: pqm@pqm.ubuntu.com-20101005211513-whouyj5t7oo92gmq
(gz) Add support for GNU lsh as a secure shell client (Matthew Gordon)

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bzrlib/chunk_writer.py
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"""ChunkWriter: write compressed data out with a fixed upper bound."""
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from __future__ import absolute_import
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import zlib
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from zlib import Z_FINISH, Z_SYNC_FLUSH
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        bytes that did not fit in the chunk.
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        :return: (compressed_bytes, unused_bytes, num_nulls_needed)
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            * compressed_bytes: a list of bytes that were output from the
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              compressor. If the compressed length was not exactly chunk_size,
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              the final string will be a string of all null bytes to pad this
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              to chunk_size
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            * unused_bytes: None, or the last bytes that were added, which we
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              could not fit.
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            * num_nulls_needed: How many nulls are padded at the end
 
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            compressed_bytes    a list of bytes that were output from the
 
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                                compressor. If the compressed length was not
 
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                                exactly chunk_size, the final string will be a
 
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                                string of all null bytes to pad this to
 
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                                chunk_size
 
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            unused_bytes        None, or the last bytes that were added, which
 
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                                we could not fit.
 
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            num_nulls_needed    How many nulls are padded at the end
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        """
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        self.bytes_in = None # Free the data cached so far, we don't need it
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        out = self.compressor.flush(Z_FINISH)
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        :param extra_bytes: Optional, if supplied we will add it with
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            Z_SYNC_FLUSH
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        :return: (bytes_out, bytes_out_len, alt_compressed)
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            * bytes_out: is the compressed bytes returned from the compressor
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            * bytes_out_len: the length of the compressed output
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            * compressor: An object with everything packed in so far, and
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              Z_SYNC_FLUSH called.
 
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            bytes_out   is the compressed bytes returned from the compressor
 
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            bytes_out_len the length of the compressed output
 
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            compressor  An object with everything packed in so far, and
 
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                        Z_SYNC_FLUSH called.
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        """
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        compressor = zlib.compressobj()
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        bytes_out = []