Function ipfrs_has 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn ipfrs_has(
    client: *mut IpfrsClient,
    cid: *const c_char,
    out_exists: *mut c_int,
) -> c_int

Check if a block exists by CID

Arguments

• client - Pointer to IpfrsClient
• cid - Null-terminated CID string
• out_exists - Output pointer to receive existence flag (1 = exists, 0 = not found)

Returns

Error code (0 for success)

Safety

• client must be a valid pointer from ipfrs_client_new()
• cid must be a valid null-terminated UTF-8 string
• out_exists must be a valid pointer