Package lzw :: Class ByteEncoder

Class ByteEncoder

object --+
         |
        ByteEncoder

Takes a stream of uncompressed bytes and produces a stream of compressed bytes, usable by ByteDecoder. Combines an Encoder with a BitPacker.

>>> import lzw
>>>
>>> enc = lzw.ByteEncoder(12)
>>> bigstr = b"gabba gabba yo gabba gabba gabba yo gabba gabba gabba yo gabba gabba gabba yo"
>>> encoding = enc.encodetobytes(bigstr)
>>> encoded = b"".join( b for b in encoding )
>>> encoded
'3\x98LF#\x08\x82\x05\x04\x83\x1eM\xf0x\x1c\x16\x1b\t\x88C\xe1q(4"\x1f\x17\x85C#1X\xec.\x00'
>>>
>>> dec = lzw.ByteDecoder()
>>> decoding = dec.decodefrombytes(encoded)
>>> decoded = b"".join(decoding)
>>> decoded == bigstr
True

Instance Methods

__init__(self, max_width=12)
max_width is the maximum width in bits we want to see in the output stream of codepoints.

source code

encodetobytes(self, bytesource)
Returns an iterator of bytes, adjusting our packed width between minwidth and maxwidth when it detects an overflow is about to occur.

source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties
Inherited from `object`: `__class__`

Method Details

init(self, max_width=12)
(Constructor)

source code

max_width is the maximum width in bits we want to see in the output stream of codepoints.

Overrides: object.__init__

encodetobytes(self, bytesource)

source code

Returns an iterator of bytes, adjusting our packed width between minwidth and maxwidth when it detects an overflow is about to occur. Dual of ByteDecoder.decodefrombytes.

Class ByteEncoder

__init__(self, max_width=12) (Constructor)

encodetobytes(self, bytesource)

init(self, max_width=12)
(Constructor)