libsbf 0.15.5

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

// GALNav Block 4002
#[binrw]
#[derive(Debug)]
pub struct GALNav {
    #[br(map = |x: u32| if x == crate::DO_NOT_USE_U4 { None } else { Some(x) })]
    pub tow: Option<u32>,
    #[br(map = |x: u16| if x == crate::DO_NOT_USE_U2 { None } else { Some(x) })]
    pub wnc: Option<u16>,
    pub svid: u8,
    pub source: u8,
    pub sqrt_a: f64,
    pub m_0: f64,
    pub e: f64,
    pub i_0: f64,
    pub omega: f64,
    pub omega_0: f64,
    pub omegadot: f32,
    pub idot: f32,
    pub del_n: f32,
    pub c_uc: f32,
    pub c_us: f32,
    pub c_rc: f32,
    pub c_rs: f32,
    pub c_ic: f32,
    pub c_is: f32,
    pub t_oe: u32,
    pub t_oc: u32,
    pub a_f2: f32,
    pub a_f1: f32,
    pub a_f0: f64,
    pub wn_t_oe: u16,
    pub wn_t_oc: u16,
    pub iod_nav: u16,
    pub health_ossol: u16,
    pub health_prs: u8,
    #[br(map = |x: u8| if x == crate::DO_NOT_USE_U1 { None } else { Some(x) })]
    pub sisa_l1e5a: Option<u8>,
    #[br(map = |x: u8| if x == crate::DO_NOT_USE_U1 { None } else { Some(x) })]
    pub sisa_l1e5b: Option<u8>,
    #[br(map = |x: u8| if x == crate::DO_NOT_USE_U1 { None } else { Some(x) })]
    pub sisa_l1ae6a: Option<u8>,
    #[br(map = |x: f32| if x == crate::DO_NOT_USE_F4 { None } else { Some(x) })]
    pub bgd_l1e5a: Option<f32>,
    #[br(map = |x: f32| if x == crate::DO_NOT_USE_F4 { None } else { Some(x) })]
    pub bgd_l1e5b: Option<f32>,
    #[br(map = |x: f32| if x == crate::DO_NOT_USE_F4 { None } else { Some(x) })]
    pub bgd_l1ae6a: Option<f32>,
    #[br(map = |x: u8| if x == crate::DO_NOT_USE_U1 { None } else { Some(x) })]
    pub cnav_enc: Option<u8>,
    #[br(parse_with = binrw::helpers::until_eof)]
    pub padding: Vec<u8>,
}

impl GALNav {
    // Source constants
    pub const SOURCE_INAV: u8 = 2; // I/NAV (L1,E5b)
    pub const SOURCE_FNAV: u8 = 16; // F/NAV (L1,E5a)

    // Health_OSSOL bit masks
    pub const HEALTH_L1B_VALID: u16 = 0x0001;
    pub const HEALTH_L1B_DVS: u16 = 0x0002;
    pub const HEALTH_L1B_HS_MASK: u16 = 0x000C;
    pub const HEALTH_E5B_VALID: u16 = 0x0010;
    pub const HEALTH_E5B_DVS: u16 = 0x0020;
    pub const HEALTH_E5B_HS_MASK: u16 = 0x00C0;
    pub const HEALTH_E5A_VALID: u16 = 0x0100;
    pub const HEALTH_E5A_DVS: u16 = 0x0200;
    pub const HEALTH_E5A_HS_MASK: u16 = 0x0C00;

    // CNAVenc bit masks
    pub const CNAV_E6B_UNENCRYPTED: u8 = 0x01;
    pub const CNAV_E6C_UNENCRYPTED: u8 = 0x02;
}