grib/decoder/
param.rs

1use crate::{
2    helpers::{read_as, GribInt},
3    GribError,
4};
5
6pub(crate) struct SimplePackingParam {
7    pub(crate) ref_val: f32,
8    pub(crate) exp: i16,
9    pub(crate) dig: i16,
10    pub(crate) nbit: u8,
11}
12
13impl SimplePackingParam {
14    pub(crate) fn from_buf(buf: &[u8]) -> Result<Self, GribError> {
15        let ref_val = read_as!(f32, buf, 0);
16        let exp = read_as!(u16, buf, 4).as_grib_int();
17        let dig = read_as!(u16, buf, 6).as_grib_int();
18        let nbit = read_as!(u8, buf, 8);
19        let original_field_type_value = read_as!(u8, buf, 9);
20
21        if original_field_type_value != 0 {
22            return Err(GribError::DecodeError(
23                crate::DecodeError::SimplePackingDecodeError(
24                    super::simple::SimplePackingDecodeError::OriginalFieldValueTypeNotSupported,
25                ),
26            ));
27        }
28
29        Ok(Self {
30            ref_val,
31            exp,
32            dig,
33            nbit,
34        })
35    }
36
37    pub(crate) fn zero_bit_reference_value(&self) -> f32 {
38        self.ref_val * 10_f32.powi(-i32::from(self.dig))
39    }
40}
41
42pub(crate) struct ComplexPackingParam {
43    pub(crate) group_splitting_method_used: u8,
44    pub(crate) missing_value_management_used: u8,
45    pub(crate) ngroup: u32,
46    pub(crate) group_width_ref: u8,
47    pub(crate) group_width_nbit: u8,
48    pub(crate) group_len_ref: u32,
49    pub(crate) group_len_inc: u8,
50    pub(crate) group_len_last: u32,
51    pub(crate) group_len_nbit: u8,
52}
53
54impl ComplexPackingParam {
55    pub(crate) fn from_buf(buf: &[u8]) -> Self {
56        let group_splitting_method_used = read_as!(u8, buf, 0);
57        let missing_value_management_used = read_as!(u8, buf, 1);
58        let ngroup = read_as!(u32, buf, 10);
59        let group_width_ref = read_as!(u8, buf, 14);
60        let group_width_nbit = read_as!(u8, buf, 15);
61        let group_len_ref = read_as!(u32, buf, 16);
62        let group_len_inc = read_as!(u8, buf, 20);
63        let group_len_last = read_as!(u32, buf, 21);
64        let group_len_nbit = read_as!(u8, buf, 25);
65        Self {
66            group_splitting_method_used,
67            missing_value_management_used,
68            ngroup,
69            group_width_ref,
70            group_width_nbit,
71            group_len_ref,
72            group_len_inc,
73            group_len_last,
74            group_len_nbit,
75        }
76    }
77}
grib/decoder/param.rs

grib/decoder/
param.rs
