Function decode 

pub fn decode<'a>(
    codec: PayloadCodec,
    stored: &'a [u8],
    raw_byte_len: u64,
) -> Result<Cow<'a, [u8]>, CodecError>

Decode stored chunk bytes to uncompressed payload (raw_byte_len bytes).

Raw → Cow::Borrowed; zstd → owned. For raw, stored.len() must equal raw_byte_len.

The Cow return avoids allocating for memory-mapped raw chunks while preserving one API for compressed and uncompressed payloads.

Errors

Returns CodecError on length mismatch or zstd failure.