This project is designed to develop a class, :class:`base64io.Base64IO`, that implements a streaming interface for Base64 encoding.
Python has supported native Base64 encoding since version 2.4. However, there is no streaming interface for Base64 encoding, and none is available from the community.
base64.decode interface lets you shuffle data between
two streams, but it assumes that you have two complete streams. We wanted a
standard stream that applies Base64 encoding and decoding.
:class:`base64io.Base64IO` provides an io streaming interface with context manager support that transparently Base64-encodes data read from it. You can use it to transform large files without caching the entire context in memory, or to transform an existing stream.
For the latest full documentation, see Read the Docs.
Find us on GitHub.
:class:`base64io.Base64IO` has no dependencies other than the standard library and should work with any version of Python greater than 2.6. We test it on CPython 2.6, 2.7, 3.3, 3.4, 3.5, 3.6, and 3.7.
$ pip install base64io
:class:`base64io.Base64IO` wraps the input stream and transparently encodes or decodes data written to or read from the input stream.
write()encodes data before writing it to the wrapped stream
read()decodes data after reading it from the wrapped stream
Also, :class:`base64io.Base64IO` does not support:
If you are not using :class:`base64io.Base64IO` as a context manager, when you write to
a :class:`base64io.Base64IO` stream, you must close the stream after your final
write. The Base64 transformation might hold up to two bytes of unencoded data in an
internal buffer before writing it to the wrapped stream. Calling
this buffer and writes the padded result to the wrapped stream. The
:class:`base64io.Base64IO` context manager does this for you.
from base64io import Base64IO with open("source_file", "rb") as source, open("encoded_file", "wb") as target: with Base64IO(target) as encoded_target: for line in source: encoded_target.write(line)
When it reads data from the wrapping stream, it might read up to three additional bytes from the underlying stream.
from base64io import Base64IO with open("encoded_file", "rb") as encoded_source, open("target_file", "wb") as target: with Base64IO(encoded_source) as source: for line in source: target.write(line)
This library is licensed under the Apache 2.0 License.