Function decompress_payload 

pub fn decompress_payload(
    compression: u8,
    data: &[u8],
    uncompressed_len: u32,
) -> Result<Vec<u8>>

Decompress a sealed payload under the SPEC §1.1 bomb guard.

Rejects a declared length over MAX_DECOMPRESSED_BYTES BEFORE decoding, bounds the decoder output to that cap DURING, and rejects on any length mismatch — a hostile peer cannot OOM the host.

Errors

MessageError::DecompressionBomb if uncompressed_len exceeds the cap; MessageError::UnsupportedCompression for an unknown id; MessageError::DecompressedLengthMismatch on an overrun or a decoded-length disagreement; MessageError::Codec on a zstd decoder failure.