Is part of git repository : https://htmlpreview.github.io/?https://github.com/lz4/lz4/blob/master/doc/lz4_manual.html

This is a blog post explaining in detail how compressed data is represented. https://fastcompression.blogspot.com/2011/05/lz4-explained.html

It is also part of git repository : https://github.com/lz4/lz4/blob/master/doc/lz4_Block_format.md

When input data is very large, compressing it as a single block is inconvenient. Furthermore, there is a need for many systems to compress data in an interoperable ways. For both objectives, a Frame format has been specified, and is now provided within library lz4frame. The frame format is documented here :

• https://github.com/lz4/lz4/blob/master/doc/lz4_Frame_format.md
• https://fastcompression.blogspot.com/2013/04/lz4-streaming-format-final.html
• https://docs.google.com/document/d/1gZbUoLw5hRzJ5Q71oPRN6TO4cRMTZur60qip-TE7BhQ/edit