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use rayon::prelude::*;
use std::str::FromStr;
use subslice_index::subslice_index;
pub struct Pattern {
buf: Vec<u8>,
}
impl Pattern {
pub fn matches(&self, buf: &[u8]) -> bool {
self.buf
.par_iter()
.zip(buf.par_iter())
.all(|(&pattern_byte, &buffer_byte)| {
pattern_byte == 0x00 || pattern_byte == buffer_byte
})
}
}
impl From<&[u8]> for Pattern {
fn from(buf: &[u8]) -> Pattern {
Pattern {
buf: Vec::from(buf),
}
}
}
impl FromStr for Pattern {
type Err = usize;
fn from_str(buf_str: &str) -> Result<Pattern, Self::Err> {
let mut buf = Vec::new();
for byte_str in buf_str.split_ascii_whitespace() {
if byte_str == "?" {
buf.push(0x00);
} else {
match u8::from_str_radix(byte_str, 16) {
Ok(byte) => {
buf.push(byte);
}
Err(_) => return Err(subslice_index(buf_str.as_bytes(), byte_str.as_bytes())),
};
}
}
Ok(Pattern { buf })
}
}
pub fn find_pattern(buf: &[u8], pattern: Pattern) -> Vec<&[u8]> {
buf.par_windows(pattern.buf.len())
.filter(|&window| pattern.matches(window))
.collect()
}
#[cfg(test)]
mod test {
use super::*;
#[test]
#[should_panic]
fn empty_pattern() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[][..]);
find_pattern(buf, pattern);
}
#[test]
fn not_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[1, 2][..]);
assert!(!find_pattern(buf, pattern).is_empty());
}
#[test]
fn empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[1, 3][..]);
assert!(find_pattern(buf, pattern).is_empty());
}
#[test]
fn simple_wildcard_not_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[1, 0x00, 3][..]);
assert!(!find_pattern(buf, pattern).is_empty());
}
#[test]
fn simple_wildcard_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[1, 0x00, 4][..]);
assert!(find_pattern(buf, pattern).is_empty());
}
#[test]
fn wildcard_start_not_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[0x00, 3][..]);
assert!(!find_pattern(buf, pattern).is_empty());
}
#[test]
fn wildcard_start_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[0x00, 1][..]);
assert!(find_pattern(buf, pattern).is_empty());
}
#[test]
fn wildcard_end_not_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[1, 2, 0x00][..]);
assert!(!find_pattern(buf, pattern).is_empty());
}
#[test]
fn wildcard_end_empty() {
let buf = &[1, 2, 3];
let pattern = Pattern::from(&[2, 3, 0x00][..]);
assert!(find_pattern(buf, pattern).is_empty());
}
#[test]
fn multi_match() {
let buf = &[1, 2, 3, 4, 3, 2, 1, 2, 3];
let pattern = Pattern::from(&[1, 2, 0x00][..]);
assert_eq!(find_pattern(buf, pattern).len(), 2);
}
#[test]
fn function_signature() {
let buf = include_bytes!("..\\test\\crt.exe");
let pattern = Pattern::from(
&[
0xe8, 0x00, 0x00, 0x00, 0x00, 0xe8, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8b, 0xd8,
][..],
);
let result = find_pattern(buf, pattern);
assert!(!result.is_empty());
assert_eq!(
result[0],
&[0xe8, 0x1c, 0x04, 0x00, 0x00, 0xe8, 0xcb, 0x05, 0x00, 0x00, 0x48, 0x8b, 0xd8][..]
);
assert_eq!(subslice_index(buf, result[0]), 0x5bb);
}
}