I have a structure with some fixed-sized arrays:

```
struct PublicHeaderBlock_LAS14 {
    file_signature: [u8; 4],
    file_source_id: u16,
    global_encoding: u16,
    project_id_data_1: u32,
    project_id_data_2: u16,
    project_id_data_3: u16,
    project_id_data_4: [u8; 8],
    version_major: u8,
    version_minor: u8,
    systemIdentifier: [u8; 32], // ...
}

```

I'm reading in bytes from a file into a fixed size array and am copying those bytes into the struct bit by bit.

```
fn create_header_struct_las14(&self, buff: &[u8; 373]) -> PublicHeaderBlock_LAS14 {
    PublicHeaderBlock_LAS14 {
        file_signature: [buff[0], buff[1], buff[2], buff[3]],
        file_source_id: (buff[4] | buff[5] << 7) as u16,
        global_encoding: (buff[6] | buff[7] << 7) as u16,
        project_id_data_1: (buff[8] | buff[9] << 7 | buff[10] << 7 | buff[11] << 7) as u32,
        project_id_data_2: (buff[12] | buff[13] << 7) as u16,
        project_id_data_3: (buff[14] | buff[15] << 7) as u16,
        project_id_data_4: [buff[16], buff[17], buff[18], buff[19], buff[20], buff[21], buff[22], buff[23]],
        version_major: buff[24],
        version_minor: buff[25],
        systemIdentifier: buff[26..58]
    }
}

```

The last line (`systemIdentifier`) doesn't work, because in the struct it is a `[u8; 32]` and `buff[26..58]` is a slice. Can I return convert a slice to a fixed sized array like that over a range, instead of doing what I've done to say `file_signature`?