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object --+ | _io._IOBase --+ | _io._BufferedIOBase --+ | object --+ | | | _io._IOBase --+ | | | io.IOBase --+ | io.BufferedIOBase --+ | gzip.GzipFile --+ | GzipStream
Handle streaming gzipped data
GzipStream extends the functionality of the gzip.GzipFile class. gzip.GzipFile generally needs a seekable object. This doesn't allow for streaming gzipped data to be processed easily (e.g. can't seek a socket). Using the _StreamBuf class enables streaming gzipped data to be processed by buffering that data at it passes through.
For Python versions 1.5.2 & 2.1.*: Normal data version. Normally sized data stream version == faster. For very large data streams (2.5GB-ish), use GzipStreamXL.
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Constructor for the GzipFile class. At least one of fileobj and filename must be given a non-trivial value. The new class instance is based on fileobj, which can be a regular file, a StringIO object, or any other object which simulates a file. It defaults to None, in which case filename is opened to provide a file object. When fileobj is not None, the filename argument is only used to be included in the gzip file header, which may includes the original filename of the uncompressed file. It defaults to the filename of fileobj, if discernible; otherwise, it defaults to the empty string, and in this case the original filename is not included in the header. The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb', depending on whether the file will be read or written. The default is the mode of fileobj if discernible; otherwise, the default is 'rb'. Be aware that only the 'rb', 'ab', and 'wb' values should be used for cross-platform portability. The compresslevel argument is an integer from 1 to 9 controlling the level of compression; 1 is fastest and produces the least compression, and 9 is slowest and produces the most compression. The default is 9. The mtime argument is an optional numeric timestamp to be written to the stream when compressing. All gzip compressed streams are required to contain a timestamp. If omitted or None, the current time is used. This module ignores the timestamp when decompressing; however, some programs, such as gunzip, make use of it. The format of the timestamp is the same as that of the return value of time.time() and of the st_mtime member of the object returned by os.stat().
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Change stream position. Change the stream position to byte offset offset. offset is interpreted relative to the position indicated by whence. Values for whence are: * 0 -- start of stream (the default); offset should be zero or positive * 1 -- current stream position; offset may be negative * 2 -- end of stream; offset is usually negative Return the new absolute position.
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repr(x)
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Flush and close the IO object. This method has no effect if the file is already closed.
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Allow for very large files/streams to be processed. Slows things down, but... Used by Python v2.2.*. Also used by Python v1.5.2/v2.1.* in inheriting class GzipStreamXL. |
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