This python module implements a container for data blocks.

Information about this module can be found here:

• github.org
• pypi.python.org

Sometimes it is more convenient to store a single file instead of multiple ones. For purposes of reuse of such kind of functionality, this module has been created. It implements a container that allows adding binary data blocks, store the whole set ob blocks in a single file, and load everything again later.

This module is heavily inspired by the internal structure of PNG files.

Every data block must have a unique key so that it can be identified within the container. This key must consist of exactly 4 ASCII characters.

All data handling is done in memory. Therefore it is recommended to not use this container for huge amounts of data. (This container is not intended to fit such requirements.)

Please include this module into your application using the following code:

import jk_bincontainer

To create an empty container simply construct it:

bc = BinContainer()

The container is now ready for use.

You can add binary data blocks like this:

bc.addBinaryBlock("abcd", b"\x01\x02\x03")

Of course you can later find the block again:

blockType, rawData = bc.getBlockByKeyE("abcd")

All named data retrieval methods return such a tuple. If you retrieve by index you will receive a triple:

blockKey, blockType, rawData = bc.getBlockByIndexE(0)

In general the following methods are available:

The data container can be serialized like this:

rawBytes = bytes(bc)

Or:

rawBytes = bc.toBytes()

Which both will construct a bytes object with data from the container.

Additionally you could construct a bytearray object if you are interested in bytearray instead of bytes:

rawByteArray = bc.toByteArray()

The data container can be serialized and written to disk:

bc.writeToFile("/path/tp/myfile")

If you have written the data to disk you can load them again. Example:

bc.loadFromFile("/path/tp/myfile")

Alternatively you might already have binary data and want to load directly from it. Example:

bc.loadFromData(binData)

This work is Open Source. This enables you to use this work for free.

Please have in mind this also enables you to contribute. We, the subspecies of software developers, can create great things. But the more collaborate, the more fantastic these things can become. Therefore Feel free to contact the author(s) listed below, either for giving feedback, providing comments, hints, indicate possible collaborations, ideas, improvements. Or maybe for "only" reporting some bugs:

• Jürgen Knauth: [email protected], [email protected]

This software is provided under the following license:

• Apache Software License 2.0