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/// Execute mutant code with given input (simulated for Phase 1)
/// Real implementation would compile mutant and execute with input
fn execute_mutant_with_input(_mutant_source: &str, input: &[u8]) -> Result<()> {
// Phase 1: Simulate execution
// This would be replaced with actual compilation + execution
// Simulate crash on certain patterns
if input.len() > 100 {
// Simulate out-of-bounds access crash
anyhow::bail!("Simulated crash: buffer overflow");
}
// Simulate success
Ok(())
}
/// Mutate an input to create new test cases
fn mutate_input(seed: &[u8]) -> Vec<u8> {
use rand::Rng;
let mut rng = rand::rng();
let mut mutated = seed.to_vec();
if mutated.is_empty() {
return vec![rng.random::<u8>()];
}
// Apply random mutation strategy
match rng.random_range(0..5) {
0 => {
// Bit flip
if !mutated.is_empty() {
let idx = rng.random_range(0..mutated.len());
let bit = rng.random_range(0..8);
mutated[idx] ^= 1 << bit;
}
}
1 => {
// Byte flip
if !mutated.is_empty() {
let idx = rng.random_range(0..mutated.len());
mutated[idx] = rng.random::<u8>();
}
}
2 => {
// Insert byte
let idx = rng.random_range(0..=mutated.len());
mutated.insert(idx, rng.random::<u8>());
}
3 => {
// Delete byte
if !mutated.is_empty() {
let idx = rng.random_range(0..mutated.len());
mutated.remove(idx);
}
}
4 => {
// Append bytes
let count = rng.random_range(1..=4);
for _ in 0..count {
mutated.push(rng.random::<u8>());
}
}
_ => unreachable!(),
}
mutated
}