ArgumentOutOfRangeException Occurs when decompressing large files

[mjebrahimi]

This exception occurs when decompressing files with actual large size (for example 900 MB).
To reproduce you can use this sample with a large file on your machine and I hope this error occurs to you too ;)

[MiloszKrajewski]

It blows up in test, not in compression (source.Length * 255) is too large to allocate.
There are many things wrong with this example you gave. I mean I don't know which parts are just 'for example' and where you think it is the right way to use it, so:

• for large amount of data you should you use LZ4Stream
• you should know how much data you expect after decompression when using blocks (LZ4Codec), it is very ineffective to use length * 255
• if you really dont want to use LZ4Steam and you don't want to implement your own block "packaging" use LZ4Pickler.
• array.Take(length).ToArray() is one of the slowest ways to get a slice of array (this might be 10 slower then compression itself); you can use it for testing, but please don't use it for performance testing (array.AsSpan(0, length).ToArray() is not that bad)