Function blosc_src::blosc_cbuffer_sizes

pub unsafe extern "C" fn blosc_cbuffer_sizes(
    cbuffer: *const c_void,
    nbytes: *mut usize,
    cbytes: *mut usize,
    blocksize: *mut usize
)

Return information about a compressed buffer, namely the number of uncompressed bytes (nbytes) and compressed (cbytes). It also returns the blocksize (which is used internally for doing the compression by blocks).

You only need to pass the first BLOSC_MIN_HEADER_LENGTH bytes of a compressed buffer for this call to work.

If the format is not supported by the library, all output arguments will be filled with zeros.