LZ4

LZ4 is a lossless data compression algorithm and compressed data format. It is designed to support very fast compression.

Identification
When used as a file format, LZ4 files begin with signature bytes.

There is also a legacy format, whose signature is.

Resources

 * LZ4 website
 * LZ4 explained
 * How LZ4 works
 * Raising Lazarus - The 20 Year Old Bug that Went to Mars vs. Debunking the LZ4 "20 years old bug" myth