datapool 0.1.4

Tool to generate a pool of testdata
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

use std::io::{stdout, Write};

use byteorder::{BigEndian, LittleEndian, NativeEndian, WriteBytesExt};
use clap::Parser;
use rand::{thread_rng, SeedableRng};
use rand_chacha::ChaCha8Rng;
use rand_distr::{Distribution, Normal, NormalError};

mod cli;

fn main() -> Result<(), NormalError> {
    let args = cli::Cli::parse();
    let mut output = stdout();

    match args.datatype {
        cli::Datatype::Double => {
            let values = get_normal_distribution_f64(args.mean, args.std_dev, args.num, args.seed)?;
            if args.print {
                println!("{:?}", values)
            } else {
                write_to_disk_f64(&values, &mut output, args.endianess).unwrap();
            }
        }
        cli::Datatype::Float => {
            let values = get_normal_distribution_f32(
                args.mean as f32,
                args.std_dev as f32,
                args.num,
                args.seed,
            )?;
            if args.print {
                println!("{:?}", values)
            } else {
                write_to_disk_f32(&values, &mut output, args.endianess).unwrap();
            }
        }
    }
    Ok(())
}

fn get_normal_distribution_f64(
    mean: f64,
    std_dev: f64,
    size: usize,
    seed: Option<u64>,
) -> Result<Vec<f64>, NormalError> {
    let normal = Normal::new(mean, std_dev)?;
    let values: Vec<f64> = match seed {
        Some(s) => {
            let mut rng = ChaCha8Rng::seed_from_u64(s);
            std::iter::repeat(0f64)
                .take(size)
                .map(|_| normal.sample(&mut rng))
                .collect()
        }
        None => {
            let mut rng = thread_rng();
            std::iter::repeat(0f64)
                .take(size)
                .map(|_| normal.sample(&mut rng))
                .collect()
        }
    };

    Ok(values)
}

fn to_u8_f64(data: &[f64], endianess: cli::Endianess) -> Vec<u8> {
    let mut wtr = Vec::new();
    match endianess {
        cli::Endianess::Big => {
            for val in data.iter() {
                wtr.write_f64::<BigEndian>(*val).unwrap();
            }
            wtr
        }
        cli::Endianess::Little => {
            for val in data.iter() {
                wtr.write_f64::<LittleEndian>(*val).unwrap();
            }
            wtr
        }
        cli::Endianess::Native => {
            for val in data.iter() {
                wtr.write_f64::<NativeEndian>(*val).unwrap();
            }
            wtr
        }
    }
}

fn write_to_disk_f64<W: Write>(
    values: &[f64],
    path: &mut W,
    endianess: cli::Endianess,
) -> std::io::Result<()> {
    let data = to_u8_f64(values, endianess);
    path.write_all(&data)?;
    Ok(())
}

fn get_normal_distribution_f32(
    mean: f32,
    std_dev: f32,
    size: usize,
    seed: Option<u64>,
) -> Result<Vec<f32>, NormalError> {
    let normal = Normal::new(mean, std_dev)?;
    let values: Vec<f32> = match seed {
        Some(s) => {
            let mut rng = ChaCha8Rng::seed_from_u64(s);
            std::iter::repeat(0f32)
                .take(size)
                .map(|_| normal.sample(&mut rng))
                .collect()
        }
        None => {
            let mut rng = thread_rng();
            std::iter::repeat(0f32)
                .take(size)
                .map(|_| normal.sample(&mut rng))
                .collect()
        }
    };

    Ok(values)
}

fn to_u8_f32(data: &[f32], endianess: cli::Endianess) -> Vec<u8> {
    let mut wtr = Vec::new();
    match endianess {
        cli::Endianess::Big => {
            for val in data.iter() {
                wtr.write_f32::<BigEndian>(*val).unwrap();
            }
            wtr
        }
        cli::Endianess::Little => {
            for val in data.iter() {
                wtr.write_f32::<LittleEndian>(*val).unwrap();
            }
            wtr
        }
        cli::Endianess::Native => {
            for val in data.iter() {
                wtr.write_f32::<NativeEndian>(*val).unwrap();
            }
            wtr
        }
    }
}

fn write_to_disk_f32<W: Write>(
    values: &[f32],
    path: &mut W,
    endianess: cli::Endianess,
) -> std::io::Result<()> {
    let data = to_u8_f32(values, endianess);
    path.write_all(&data)?;
    Ok(())
}