Package lzw :: Class Encoder

Class Encoder

object --+
         |
        Encoder

Given an iterator of bytes, returns an iterator of integer codepoints, suitable for use by Decoder. The core of the "compression" side of lzw compression/decompression.

Instance Methods

__init__(self, max_code_size=4096)
When the encoding codebook grows larger than max_code_size, the Encoder will clear its codebook and emit a CLEAR_CODE

source code

code_size(self)
Returns a count of the known codes, including codes that are implicit in the data but have not yet been produced by the iterator.

source code

flush(self)
Yields any buffered codepoints, followed by a CLEAR_CODE, and clears the codebook as a side effect.

source code

encode(self, bytesource)
Given an iterator over bytes, yields the corresponding stream of codepoints.

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_code_size=4096)
(Constructor)

source code

When the encoding codebook grows larger than max_code_size, the Encoder will clear its codebook and emit a CLEAR_CODE

Overrides: object.__init__

encode(self, bytesource)

source code

Given an iterator over bytes, yields the corresponding stream of codepoints. Will clear the codes at the end of the stream.

>>> import lzw
>>> enc = lzw.Encoder()
>>> [ cp for cp in enc.encode("gabba gabba yo gabba") ]
[103, 97, 98, 98, 97, 32, 258, 260, 262, 121, 111, 263, 259, 261, 256]

Class Encoder

__init__(self, max_code_size=4096) (Constructor)

encode(self, bytesource)

init(self, max_code_size=4096)
(Constructor)