hex_patch/app/plugins/
header_context.rs

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
use std::collections::HashMap;

use mlua::UserData;
use object::{Architecture, Endianness};

use crate::headers::{bitness::Bitness, custom_header::CustomHeader, section::Section};

#[derive(Debug, Clone, Default)]
pub struct HeaderContext {
    pub bitness: Option<Bitness>,
    pub endianness: Option<Endianness>,
    pub entry: Option<u64>,
    pub architecture: Option<Architecture>,
    pub sections: Vec<Section>,
    pub symbols: HashMap<u64, String>,
}

impl HeaderContext {
    pub fn try_into_custom_header(self) -> Option<CustomHeader> {
        if let (Some(bitness), Some(endianness), Some(entry), Some(architecture)) =
            (self.bitness, self.endianness, self.entry, self.architecture)
        {
            let symbols_by_name = self.symbols.iter().map(|(k, v)| (v.clone(), *k)).collect();
            Some(CustomHeader {
                bitness,
                entry,
                endianness,
                architecture,
                sections: self.sections,
                symbols: self.symbols,
                symbols_by_name,
            })
        } else {
            None
        }
    }
}

impl UserData for HeaderContext {
    fn add_methods<'lua, M: mlua::UserDataMethods<'lua, Self>>(methods: &mut M) {
        methods.add_method_mut("set_bitness", |_, this, bitness: u8| {
            if this.bitness.is_some() {
                Err(mlua::Error::external("bitness already set"))
            } else {
                match bitness {
                    32 => {
                        this.bitness = Some(Bitness::Bit32);
                        Ok(())
                    }
                    64 => {
                        this.bitness = Some(Bitness::Bit64);
                        Ok(())
                    }
                    _ => Err(mlua::Error::external("invalid bitness")),
                }
            }
        });

        methods.add_method_mut("set_entry", |_, this, entry_point: u64| {
            if this.entry.is_some() {
                Err(mlua::Error::external("entry point already set"))
            } else {
                this.entry = Some(entry_point);
                Ok(())
            }
        });

        methods.add_method_mut("set_endianness", |_, this, endianness: String| {
            if this.endianness.is_some() {
                Err(mlua::Error::external("endianness already set"))
            } else {
                match endianness.as_str() {
                    "little" => {
                        this.endianness = Some(Endianness::Little);
                        Ok(())
                    }
                    "big" => {
                        this.endianness = Some(Endianness::Big);
                        Ok(())
                    }
                    _ => Err(mlua::Error::external("invalid endianness")),
                }
            }
        });

        methods.add_method_mut("set_architecture", |_, this, architecture: String| {
            if this.architecture.is_some() {
                Err(mlua::Error::external("architecture already set"))
            } else {
                let architecture = match architecture.as_str() {
                    "Unknown" => Architecture::Unknown,
                    "Aarch64" => Architecture::Aarch64,
                    "Aarch64_Ilp32" => Architecture::Aarch64_Ilp32,
                    "Arm" => Architecture::Arm,
                    "Avr" => Architecture::Avr,
                    "Bpf" => Architecture::Bpf,
                    "Csky" => Architecture::Csky,
                    "I386" => Architecture::I386,
                    "X86_64" => Architecture::X86_64,
                    "X86_64_X32" => Architecture::X86_64_X32,
                    "Hexagon" => Architecture::Hexagon,
                    "LoongArch64" => Architecture::LoongArch64,
                    "Mips" => Architecture::Mips,
                    "Mips64" => Architecture::Mips64,
                    "Msp430" => Architecture::Msp430,
                    "PowerPc" => Architecture::PowerPc,
                    "PowerPc64" => Architecture::PowerPc64,
                    "Riscv32" => Architecture::Riscv32,
                    "Riscv64" => Architecture::Riscv64,
                    "S390x" => Architecture::S390x,
                    "Sbf" => Architecture::Sbf,
                    "Sharc" => Architecture::Sharc,
                    "Sparc" => Architecture::Sparc,
                    "Sparc32Plus" => Architecture::Sparc32Plus,
                    "Sparc64" => Architecture::Sparc64,
                    "Wasm32" => Architecture::Wasm32,
                    "Wasm64" => Architecture::Wasm64,
                    "Xtensa" => Architecture::Xtensa,
                    _ => return Err(mlua::Error::external("invalid architecture")),
                };
                this.architecture = Some(architecture);
                Ok(())
            }
        });

        methods.add_method_mut(
            "add_section",
            |_, this, (name, virtual_address, file_offset, size): (String, u64, u64, u64)| {
                this.sections.push(Section {
                    name,
                    virtual_address,
                    file_offset,
                    size,
                });
                Ok(())
            },
        );

        methods.add_method_mut("add_symbol", |_, this, (address, name): (u64, String)| {
            this.symbols.insert(address, name);
            Ok(())
        });
    }
}