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
pub mod error;
pub mod instructions;
use hex;
use std::collections::BTreeMap;
use std::io::Cursor;
use instructions::{assemble_instruction, disassemble_next_byte};
pub use error::DisassemblyError;
pub use instructions::Instruction;
#[derive(Clone, Debug)]
pub struct Disassembly {
pub instructions: BTreeMap<usize, Instruction>,
}
impl Disassembly {
pub fn from_bytes(bytes: &[u8]) -> Result<Self, DisassemblyError> {
let instructions = disassemble_bytes(bytes)?;
Ok(Self { instructions })
}
pub fn from_hex_str(input: &str) -> Result<Self, DisassemblyError> {
let instructions = disassemble_hex_str(input)?;
Ok(Self { instructions })
}
pub fn get(&self, addr: usize) -> Option<Instruction> {
self.instructions.get(&addr).cloned()
}
}
pub fn assemble_instructions(disassembly: Vec<Instruction>) -> Vec<u8> {
let mut result = Vec::new();
for disas in disassembly {
result.extend(assemble_instruction(disas));
}
result
}
fn disassemble_hex_str(input: &str) -> Result<BTreeMap<usize, Instruction>, DisassemblyError> {
let input = if input[0..2] == *"0x" {
&input[2..]
} else {
input
};
let bytes = hex::decode(input)?;
disassemble_bytes(&bytes)
}
fn disassemble_bytes(bytes: &[u8]) -> Result<BTreeMap<usize, Instruction>, DisassemblyError> {
let mut instructions = BTreeMap::new();
let mut cursor = Cursor::new(bytes);
loop {
let result = disassemble_next_byte(&mut cursor);
match result {
Err(DisassemblyError::IOError(..)) => break,
Ok((offset, instruction)) => {
instructions.insert(offset, instruction);
}
Err(err) => {
if let DisassemblyError::TooFewBytesForPush = err {
break;
}
return Err(err);
}
}
}
Ok(instructions)
}
#[cfg(test)]
mod tests {
use super::*;
use maplit::hashmap;
use quickcheck::{quickcheck, TestResult};
use std::iter::FromIterator;
#[test]
fn simple_programm() {
let program = "0x608040526002610100";
let program_bytes = vec![0x60, 0x80, 0x40, 0x52, 0x60, 0x02, 0x61, 0x01, 0x00];
let disas = BTreeMap::from_iter(hashmap! {
0 => Instruction::Push(vec!(0x80)),
2 => Instruction::Blockhash,
3 => Instruction::MStore,
4 => Instruction::Push(vec!(0x2)),
6 => Instruction::Push(vec!(0x1, 0x00)),
});
assert_eq!(disassemble_hex_str(program).unwrap(), disas);
assert_eq!(disassemble_bytes(&program_bytes).unwrap(), disas);
}
#[test]
fn longer_program() {
let prog = "6080604052348015600f57600080fd5b506004361060285760003560e01c806318b969a014602d575b600080fd5b60336049565b6040518082815260200191505060405180910390f35b6000600260016003600054020181605c57fe5b04600081905550633b9aca0060005481607157fe5b06600081905550600043905060004490506000429050600045905060008183858760005401010101905060006025828160a657fe5b0690508096505050505050509056fea265627a7a72315820352cd5f3ce6a4befb464c84b845f54a57437fd835fffaf9b4d17a089ea70d25f64736f6c634300050d0032";
disassemble_hex_str(prog).unwrap();
}
}