isobemak 0.2.2

Create bootable ISO images with FAT32 and UEFI (El Torito) support in Rust.
Documentation 
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// isobemak/src/iso/dir_record.rs

/// ISO9660 directory record structure
pub struct IsoDirEntry<'a> {
    pub lba: u32,
    pub size: u32,
    pub flags: u8,
    pub name: &'a str,
}

impl<'a> IsoDirEntry<'a> {
    /// Creates ISO9660 directory record bytes
    pub fn to_bytes(&self) -> Vec<u8> {
        let file_id_vec: Vec<u8>;
        let file_id_bytes: &[u8];
        let actual_file_id_len: u8;

        match self.name {
            "." => {
                file_id_bytes = b"\x00";
                actual_file_id_len = 1;
            }
            ".." => {
                file_id_bytes = b"\x01";
                actual_file_id_len = 1;
            }
            _ => {
                if self.flags & 0x02 != 0 {
                    // Directory
                    file_id_bytes = self.name.as_bytes();
                    actual_file_id_len = self.name.len() as u8;
                } else {
                    // File identifiers in ISO 9660 should be uppercase and can include a version number.
                    let name_with_version = format!("{};1", self.name.to_uppercase());
                    file_id_vec = name_with_version.into_bytes();
                    file_id_bytes = &file_id_vec;
                    actual_file_id_len = file_id_vec.len() as u8;
                }
            }
        };

        let base_len = 33 + actual_file_id_len as usize;
        let record_len_usize = base_len + (base_len % 2);
        assert!(
            record_len_usize <= u8::MAX as usize,
            "Directory record length exceeds 255 bytes"
        );
        let record_len = record_len_usize as u8;
        let mut record = vec![0u8; record_len as usize];

        record[0] = record_len;
        record[1] = 0;
        record[2..6].copy_from_slice(&self.lba.to_le_bytes());
        record[6..10].copy_from_slice(&self.lba.to_be_bytes());
        record[10..14].copy_from_slice(&self.size.to_le_bytes());
        record[14..18].copy_from_slice(&self.size.to_be_bytes());
        record[25] = self.flags;
        record[26] = 0;
        record[27] = 0;
        record[28..30].copy_from_slice(&1u16.to_le_bytes());
        record[30..32].copy_from_slice(&1u16.to_be_bytes());
        record[32] = actual_file_id_len;
        record[33..33 + actual_file_id_len as usize].copy_from_slice(file_id_bytes);

        record
    }
}