libmwemu 0.24.5

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
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

use crate::fpu::f80::F80;

#[test]
pub fn fpu_f80_emulation() {
    let mut f80 = F80::new();

    f80.st = (16383u128 << 64) | (1u128 << 63);
    assert_eq!(f80.to_integer_u128(), 1);

    f80.set_f64(1.0);
    assert_eq!(f80.get(), 0x3fff8000000000000000);

    // Test zero
    f80.set_f64(0.0);
    assert!(f80.is_zero());
    assert_eq!(f80.get_f64(), 0.0);

    f80.set_f64(-0.0);
    assert!(f80.is_zero());
    assert_eq!(f80.get_f64(), -0.0);

    // Test infinity
    f80.set_f64(f64::INFINITY);
    assert!(f80.is_infinite());
    assert_eq!(f80.get_f64(), f64::INFINITY);

    f80.set_f64(f64::NEG_INFINITY);
    assert!(f80.is_infinite());
    assert_eq!(f80.get_f64(), f64::NEG_INFINITY);

    // Test NaN
    f80.set_f64(f64::NAN);
    assert!(f80.is_nan());
    assert!(f80.get_f64().is_nan());

    // Test normal numbers roundtrip with tolerance
    let test_values = [
        1.0,
        -1.0,
        3.141592653589793,
        -2.718281828459045,
        1e10,
        -1e-10,
    ];

    for &val in &test_values {
        f80.set_f64(val);
        let back = f80.get_f64();
        let diff = (val - back).abs();
        assert!(diff < 1e-12, "val: {}, got: {}", val, back);
    }

    // Test flags negative checks
    f80.set_f64(42.0);
    assert!(!f80.is_nan());
    assert!(!f80.is_infinite());
    assert!(!f80.is_zero());

    let test_values = [
        0u128,
        1,
        9,
        10,
        42,
        12345,
        99999999,
        12345678901234567890u128, // big num
    ];

    for &val in &test_values {
        f80.set(val);

        // Conver to BCD packed and reconstruct
        let bcd = f80.to_bcd_packed();
        let mut f80_2 = F80::new();
        f80_2.from_bcd_packed(&bcd);

        assert_eq!(
            f80.to_integer_u128(),
            f80_2.to_integer_u128(),
            "BCD roundtrip: valor entero no coincide para valor {}",
            val
        );
        assert!(
            (f80.get_f64() - f80_2.get_f64()).abs() < 1e-10,
            "BCD roundtrip no coincide para valor {}",
            val
        );
    }

    f80.set_f64(259.0);
    let bcd = f80.to_bcd_packed();

    assert_eq!(bcd.len(), 10);
    assert_eq!(bcd[0], 0x59);
    assert_eq!(bcd[1], 0x02);

    f80.st = F80::encode_from_u128(259, false);
    let bcd = f80.to_bcd_packed();

    assert_eq!(bcd[0], 0x59);
    assert_eq!(bcd[1], 0x02);

    let mut f80 = F80::new();
    let val: u128 = 256;
    f80.set(val);

    let bytes = f80.get_bytes();
    let mut f80_2 = F80::new();
    f80_2.set_bytes(&bytes);

    assert_eq!(f80.get(), f80_2.get(), "Error en get() para valor {}", val);
    assert_eq!(
        f80.to_integer_u128(),
        f80_2.to_integer_u128(),
        "Error en to_integer_u128 para valor {}",
        val
    );

    let bcd1 = f80.to_bcd_packed();
    let bcd2 = f80_2.to_bcd_packed();
    assert_eq!(bcd1, bcd2, "Error en BCD packed para valor {}", val);

    // test a.add(b)

    let mut b: F80 = F80::new();
    f80.set_f64(-1.1);
    b.set_f64(1.9);
    f80.add(b);
    assert_eq!(f80.get_f64(), 0.7999999999999998);
    assert_eq!(f80.get_round_f64(4), 0.8);
    assert_eq!(f80.get(), 0x3ffeccccccccccccc000);

    f80.set_f64(1.0);
    b.set_f64(2.0);
    f80.sub(b);
    assert_eq!(f80.get_f64(), -1.0);
}