Constant MIN_MAX_BLOCK_SIZE 

pub const MIN_MAX_BLOCK_SIZE: u32 = 1024;

Smallest accepted maximum block size (the ZSTD_BLOCKSIZE_MAX_MIN bound), shared by set_max_block_size and the C ABI parameter surface. Smallest accepted maximum block size (upstream ZSTD_BLOCKSIZE_MAX_MIN): with smaller blocks the frame could outgrow its compress bound. Re-exported at the crate root.