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extern crate alloc;
use alloc::vec::Vec;
mod searcher;
pub use searcher::*;
use crate::FaitheError;
#[derive(Debug, Clone, Copy)]
pub(crate) enum ByteMatch {
Exact(u8),
Any,
}
impl ByteMatch {
#[inline]
pub fn matches(&self, b: u8) -> bool {
match self {
ByteMatch::Exact(e) => *e == b,
ByteMatch::Any => true,
}
}
}
/// Memory pattern
#[derive(Debug, Clone)]
pub struct Pattern(pub(crate) Vec<ByteMatch>);
impl Pattern {
pub(crate) fn len(&self) -> usize {
self.0.len()
}
pub(crate) fn matches(&self, data: &[u8]) -> bool {
data.iter().zip(self.0.iter()).all(|(b, m)| m.matches(*b))
}
}
impl Pattern {
/// Parses ida style pattern.
/// # Panics
/// Panics if pattern of invalid style was supplied or failed to parse a byte.
/// ```
/// # use faithe::pattern::Pattern;
/// let ida_pat = Pattern::from_ida_style("48 89 85 F0 00 00 00 4C 8B ? ? ? ? ? 48 8D");
/// ```
pub fn from_ida_style(pat: impl AsRef<str>) -> Self {
assert!(pat.as_ref().is_ascii());
Self(
pat.as_ref()
.split_ascii_whitespace()
.map(|s| {
if s == "?" {
ByteMatch::Any
} else {
ByteMatch::Exact(
u8::from_str_radix(s, 16).expect("Failed to parse the pattern."),
)
}
})
.collect::<Vec<ByteMatch>>(),
)
}
/// Parses ida style pattern. Same as [`Self::from_ida_style`] but no panics.
/// # Panics
/// Panics if pattern of invalid style was supplied or failed to parse a byte.
/// ```
/// # use faithe::pattern::Pattern;
/// let ida_pat = Pattern::from_ida_style("48 89 85 F0 00 00 00 4C 8B ? ? ? ? ? 48 8D");
/// ```
pub fn try_from_ida_style(pat: impl AsRef<str>) -> crate::Result<Self> {
if pat.as_ref().is_ascii() {
Err(FaitheError::NonAsciiPattern)
} else {
Ok(Self(
pat.as_ref()
.split_ascii_whitespace()
.map(|s| {
if s == "?" {
Ok(ByteMatch::Any)
} else {
if let Ok(b) = u8::from_str_radix(s, 16) {
Ok(ByteMatch::Exact(b))
} else {
Err(FaitheError::InvalidPattern)
}
}
})
.collect::<crate::Result<Vec<ByteMatch>>>()?,
))
}
}
/// Parses PEiD style pattern.
/// # Panics
/// Panics if pattern of invalid style was supplied or failed to parse a byte.
/// ```
/// # use faithe::pattern::Pattern;
/// let peid_pat = Pattern::from_peid_style("48 89 85 F0 00 00 00 4C 8B ?? ?? ?? ?? ?? 48 8D");
/// ```
pub fn from_peid_style(pat: impl AsRef<str>) -> Self {
Self(
pat.as_ref()
.split_ascii_whitespace()
.map(|s| {
assert_eq!(s.len(), 2);
if s == "??" {
ByteMatch::Any
} else {
ByteMatch::Exact(
u8::from_str_radix(s, 16).expect("Failed to parse the pattern."),
)
}
})
.collect::<Vec<ByteMatch>>(),
)
}
/// Parses PEiD style pattern.
/// # Panics
/// Panics if pattern of invalid style was supplied or failed to parse a byte.
/// ```
/// # use faithe::pattern::Pattern;
/// let peid_pat = Pattern::from_peid_style("48 89 85 F0 00 00 00 4C 8B ?? ?? ?? ?? ?? 48 8D");
/// ```
pub fn try_from_peid_style(pat: impl AsRef<str>) -> crate::Result<Self> {
if pat.as_ref().is_ascii() {
Err(FaitheError::NonAsciiPattern)
} else {
Ok(Self(
pat.as_ref()
.split_ascii_whitespace()
.map(|s| {
if s == "??" {
Ok(ByteMatch::Any)
} else {
if let Ok(b) = u8::from_str_radix(s, 16) {
Ok(ByteMatch::Exact(b))
} else {
Err(FaitheError::InvalidPattern)
}
}
})
.collect::<crate::Result<Vec<ByteMatch>>>()?,
))
}
}
/// Parses code style pattern.
/// # Panics
/// Panics if length os mask is not equal to the length of the pattern.
/// ```
/// # use faithe::pattern::Pattern;
/// let code_pat = Pattern::from_code_style(
/// b"\x48\x89\x85\xF0\x00\x00\x00\x4C\x8B\x00\x00\x00\x00\x00\x48\x8D",
/// b"xxxxxxxxx?????xx"
/// );
/// ```
pub fn from_code_style(pat: &[u8], mask: &[u8]) -> Self {
assert_eq!(pat.len(), mask.len());
Self(
pat.iter()
.zip(mask.iter())
.map(|(p, m)| {
if *m == b'?' {
ByteMatch::Any
} else {
ByteMatch::Exact(*p)
}
})
.collect(),
)
}
/// Parses code style pattern.
/// # Panics
/// Panics if length os mask is not equal to the length of the pattern.
/// ```
/// # use faithe::pattern::Pattern;
/// let code_pat = Pattern::from_code_style(
/// b"\x48\x89\x85\xF0\x00\x00\x00\x4C\x8B\x00\x00\x00\x00\x00\x48\x8D",
/// b"xxxxxxxxx?????xx"
/// );
/// ```
pub fn try_from_code_style(pat: &[u8], mask: &[u8]) -> crate::Result<Self> {
if pat.len() != mask.len() {
Err(FaitheError::PatternMaskMismatch)
} else {
Ok(Self(
pat.iter()
.zip(mask.iter())
.map(|(p, m)| {
if *m == b'?' {
ByteMatch::Any
} else {
ByteMatch::Exact(*p)
}
})
.collect(),
))
}
}
}