gpt_disk_io 0.16.2

GPT (GUID Partition Table) disk IO no_std library
Documentation 
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

mod common;

use common::check_derives;
use gpt_disk_types::{
    BlockSize, GptPartitionEntryArrayLayout, GptPartitionEntrySize, Lba,
};

#[test]
fn test_partition_entry_array_layout() {
    check_derives::<GptPartitionEntryArrayLayout>();

    let layout = GptPartitionEntryArrayLayout {
        start_lba: Lba(2),
        entry_size: GptPartitionEntrySize::new(256).unwrap(),
        num_entries: 128,
    };
    assert_eq!(layout.num_blocks(BlockSize::BS_512).unwrap(), 64);
    assert_eq!(
        layout
            .num_bytes_rounded_to_block(BlockSize::BS_512)
            .unwrap(),
        64 * 512
    );
    assert_eq!(layout.num_bytes_exact().unwrap(), 256 * 128);

    let bs767 = BlockSize::new(512 + 256 - 1).unwrap();
    assert_eq!(layout.num_blocks(bs767).unwrap(), 43);
    assert_eq!(layout.num_bytes_rounded_to_block(bs767).unwrap(), 43 * 767);
    assert_eq!(layout.num_bytes_exact().unwrap(), 256 * 128);

    assert_eq!(layout.num_blocks_as_usize(bs767).unwrap(), 43);
    assert_eq!(
        layout.num_bytes_rounded_to_block_as_usize(bs767).unwrap(),
        43 * 767
    );
    assert_eq!(layout.num_bytes_exact_as_usize().unwrap(), 256 * 128);
}