Function compress 

pub fn compress(data: &[u8]) -> Option<Vec<u8>>

Compress a byte slice with zstd.

Returns Some(compressed) if compression reduced the size, or None if the compressed output is >= the input size. This ensures compression is never harmful — the caller should store the block uncompressed when None is returned.

Uses the default compression level (3).

Example

use bcp_encoder::compression::compress;

let data = "fn main() { }\n".repeat(100);
match compress(data.as_bytes()) {
    Some(compressed) => assert!(compressed.len() < data.len()),
    None => { /* data was incompressible */ }
}