libsbf 0.18.0

A no_std rust crate to parse Septentrio SBF Messages.
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use crate::binrw_util;
use alloc::vec::Vec;
use binrw::binrw;
use bitflags::bitflags;

bitflags! {
    /// Status bit field of a [`DiskData`] sub-block.
    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
    pub struct DiskStatusFlags: u8 {
        /// Bit 0: the disk is mounted.
        const DISK_MOUNTED = 1 << 0;
        /// Bit 1: the disk is filled to 95% of its total capacity.
        const DISK_FULL = 1 << 1;
        /// Bit 2: set for one second each time data is written to the disk,
        /// or continuously when the logging rate exceeds 1 Hz.
        const DISK_ACTIVITY = 1 << 2;
        /// Bit 3: at least one file is open on the disk, regardless of the
        /// logging rate.
        const LOGGING_ENABLED = 1 << 3;
    }
}

// DiskStatus Block 4059
#[binrw]
#[derive(Clone, Debug)]
pub struct DiskStatus {
    #[br(map = binrw_util::map_u4)]
    #[bw(map = binrw_util::unmap_u4)]
    pub tow: Option<u32>,
    #[br(map = binrw_util::map_u2)]
    #[bw(map = binrw_util::unmap_u2)]
    pub wnc: Option<u16>,
    pub n: u8,
    pub sb_length: u8,
    pub reserved: [u8; 4],
    #[br(args { count: usize::from(n), inner: (usize::from(sb_length),) }, map = binrw_util::unwrap_subblocks)]
    #[bw(args_raw = (usize::from(*sb_length),), map = binrw_util::wrap_subblocks)]
    pub disks: Vec<DiskData>,
}

// DiskData sub-block
#[binrw]
#[derive(Clone, Debug)]
pub struct DiskData {
    /// Disk identifier, starting at 1 for the internal SD card.
    pub disk_id: u8,
    #[br(map = |x: u8| DiskStatusFlags::from_bits_retain(x))]
    #[bw(map = |x: &DiskStatusFlags| x.bits())]
    pub status: DiskStatusFlags,
    /// 16 most-significant bits of the disk usage in bytes.
    #[br(map = binrw_util::map_u2)]
    #[bw(map = binrw_util::unmap_u2)]
    pub disk_usage_msb: Option<u16>,
    /// 32 least-significant bits of the disk usage in bytes.
    #[br(map = binrw_util::map_u4)]
    #[bw(map = binrw_util::unmap_u4)]
    pub disk_usage_lsb: Option<u32>,
    /// Total disk size in Mbytes.
    #[br(map = binrw_util::map_u4_zero)]
    #[bw(map = binrw_util::unmap_u4_zero)]
    pub disk_size: Option<u32>,
    /// Counter of file and folder create/delete events, wrapping at 255.
    pub create_delete_count: u8,
    /// Disk error code: 0 no error, 254 mount failed.
    #[br(map = binrw_util::map_u1)]
    #[bw(map = binrw_util::unmap_u1)]
    pub error: Option<u8>,
}

impl DiskData {
    /// Total disk usage in bytes, combining the MSB and LSB halves.
    pub fn disk_usage_bytes(&self) -> Option<u64> {
        match (self.disk_usage_msb, self.disk_usage_lsb) {
            (Some(msb), Some(lsb)) => Some((u64::from(msb) << 32) | u64::from(lsb)),
            _ => None,
        }
    }
}