commit 833fbf63f99478b09bb9b4fb0e68e80e658889f9
Author: xenia <xenia@awoo.systems>
Date:   Fri Nov 22 02:11:59 2024 -0500

    initial commit

diff --git a/.gitignore b/.gitignore
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+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
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+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
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+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
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+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "zbasefind"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "fnv",
+ "miette",
+ "nix",
+ "term",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..70ac78d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "zbasefind"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.21", features = ["derive"] }
+fnv = "1.0.7"
+miette = { version = "7.2.0", features = ["fancy"] }
+nix = { version = "0.29.0", features = ["fs", "sched"] }
+term = "1.0.0"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..85bde91
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,128 @@
+use std::collections::BinaryHeap;
+use std::io::{BufReader, ErrorKind, Read, Seek};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use fnv::FnvHashSet;
+
+fn is_valid_ascii_chr(c: u8) -> bool {
+    (c >= 32 && c <= 126) || c == 9 || c == 10 || c == 13
+}
+
+pub fn get_strings<T>(stream: &mut T, min_len: usize) -> std::io::Result<FnvHashSet<u32>>
+where
+    T: Read + Seek,
+{
+    #[derive(Copy, Clone)]
+    enum ScanState {
+        NoString,
+        InString(usize),
+        ScanError,
+    }
+    use ScanState::*;
+
+    stream.rewind()?;
+
+    // regex is for chumps we're doing it manually
+    BufReader::new(stream)
+        .bytes()
+        .enumerate()
+        .scan(NoString, |state, (i, b)| match (*state, b) {
+            (ScanError, _) => None,
+            (_, Err(err)) => {
+                *state = ScanError;
+                Some(Some(Err(err)))
+            }
+            (NoString, Ok(b)) if is_valid_ascii_chr(b) => {
+                *state = InString(i);
+                Some(None)
+            }
+            (InString(_), Ok(b)) if is_valid_ascii_chr(b) => Some(None),
+            (InString(start_addr), Ok(b)) if b == 0 && i - start_addr >= min_len => {
+                *state = NoString;
+                Some(Some(Ok(start_addr as u32)))
+            }
+            (InString(_), Ok(_)) => {
+                *state = NoString;
+                Some(None)
+            }
+            (_, Ok(_)) => Some(None),
+        })
+        .flatten()
+        .collect()
+}
+
+pub fn get_pointers<T>(stream: &mut T, big_endian: bool) -> std::io::Result<FnvHashSet<u32>>
+where
+    T: Read + Seek,
+{
+    let mut pointers = FnvHashSet::default();
+
+    stream.rewind()?;
+    let mut reader = BufReader::new(stream);
+
+    loop {
+        let mut buf = [0u8; 4];
+        match reader.read_exact(&mut buf) {
+            Ok(_) => {
+                pointers.insert(if big_endian {
+                    u32::from_be_bytes(buf)
+                } else {
+                    u32::from_le_bytes(buf)
+                });
+            }
+            Err(ref err) if err.kind() == ErrorKind::UnexpectedEof => break,
+            Err(err) => return Err(err),
+        }
+    }
+
+    Ok(pointers)
+}
+
+pub struct ComputeProgress {
+    num_completed: AtomicUsize,
+}
+
+impl ComputeProgress {
+    #[inline]
+    pub fn new() -> ComputeProgress {
+        ComputeProgress {
+            num_completed: AtomicUsize::new(0),
+        }
+    }
+
+    #[inline]
+    pub fn num_completed(&self) -> usize {
+        self.num_completed.load(Ordering::Relaxed)
+    }
+}
+
+pub fn compute_matches(
+    strings: &FnvHashSet<u32>,
+    pointers: &FnvHashSet<u32>,
+    start_addr: u64,
+    end_addr: u64,
+    page_size: u32,
+    progress: Option<&ComputeProgress>,
+) -> BinaryHeap<(usize, u32)> {
+    if let Some(ref progress) = progress {
+        progress.num_completed.store(0, Ordering::Relaxed);
+    }
+    (start_addr..end_addr)
+        .step_by(page_size as usize)
+        .filter_map(|page| {
+            let page = page as u32;
+            let strings_offset = strings
+                .iter()
+                .filter_map(|&x| x.checked_add(page))
+                .collect::<FnvHashSet<u32>>();
+            let res = match strings_offset.intersection(pointers).count() {
+                0 => None,
+                ct => Some((ct, page)),
+            };
+            if let Some(ref progress) = progress {
+                progress.num_completed.fetch_add(1, Ordering::Relaxed);
+            }
+            res
+        })
+        .collect::<BinaryHeap<_>>()
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..752f1a7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,152 @@
+use std::fs::File;
+use std::io::Write;
+use std::os::fd::AsRawFd;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use clap::Parser;
+use miette::{IntoDiagnostic, Result};
+
+use zbasefind as lib;
+
+fn get_cpu_cores() -> usize {
+    nix::sched::sched_getaffinity(nix::unistd::Pid::this())
+        .map(|x| {
+            (0..nix::sched::CpuSet::count())
+                .filter(|i| x.is_set(*i).unwrap())
+                .count()
+        })
+        .unwrap_or(1)
+}
+
+fn page_size_parser(s: &str) -> std::result::Result<u32, String> {
+    let page_size: u32 = s.parse().map_err(|_| format!("`{s}` isn't a number"))?;
+    if page_size.count_ones() == 1 {
+        Ok(page_size)
+    } else {
+        Err(format!(
+            "page size must be a power of two: got {page_size:08x}"
+        ))
+    }
+}
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Assume target is big endian
+    #[arg(short, long, default_value_t = false)]
+    big_endian: bool,
+
+    /// Target memory page size
+    #[arg(short, long, default_value_t = 0x1000, value_parser = page_size_parser)]
+    page_size: u32,
+
+    /// Minimum string length
+    #[arg(short = 'm', long, default_value_t = 10)]
+    min_str_len: usize,
+
+    /// Maximum matches to display
+    #[arg(short = 'n', long, default_value_t = 10)]
+    max_matches: usize,
+
+    /// Number of threads to use
+    #[arg(short, long, default_value_t = get_cpu_cores())]
+    threads: usize,
+
+    /// File to scan
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let args = Args::parse();
+
+    let term = if nix::unistd::isatty(std::io::stderr().as_raw_fd()).unwrap_or(false) {
+        term::stderr()
+    } else {
+        None
+    };
+
+    let mut file = File::open(args.file).into_diagnostic()?;
+    let strings = Arc::new(lib::get_strings(&mut file, args.min_str_len).into_diagnostic()?);
+    eprintln!("Found {} strings", strings.len());
+    let pointers = Arc::new(lib::get_pointers(&mut file, args.big_endian).into_diagnostic()?);
+    eprintln!("Found {} pointers", pointers.len());
+
+    let start = 0x0000_0000u64;
+    let end = 0x1_0000_0000u64;
+    let total_pages = ((end - start) / (args.page_size as u64)) as usize;
+    let chunk_size = (end - start) / (args.threads as u64);
+    let ranges = (start..=end)
+        .step_by(chunk_size as usize)
+        .zip((start + chunk_size..=end).step_by(chunk_size as usize));
+
+    let tasks: Vec<_> = ranges
+        .map(|(start, end)| {
+            let progress = Arc::new(lib::ComputeProgress::new());
+
+            let strings = Arc::clone(&strings);
+            let pointers = Arc::clone(&pointers);
+            let child_progress = Arc::clone(&progress);
+
+            let thread = std::thread::spawn(move || {
+                lib::compute_matches(
+                    &strings,
+                    &pointers,
+                    start,
+                    end,
+                    args.page_size,
+                    Some(&child_progress),
+                )
+            });
+
+            (thread, progress)
+        })
+        .collect();
+
+    if let Some(mut term) = term {
+        loop {
+            std::thread::sleep(std::time::Duration::from_millis(100));
+            if tasks.iter().any(|(thread, _)| !thread.is_finished()) {
+                term.carriage_return().unwrap();
+                term.delete_line().unwrap();
+
+                let completed_pages: usize = tasks.iter().map(|(_, prg)| prg.num_completed()).sum();
+
+                eprint!("{} / {} ({}%)", completed_pages, total_pages,
+                    completed_pages * 100 / total_pages);
+                std::io::stderr().flush().unwrap();
+            } else {
+                break;
+            }
+        }
+
+        term.carriage_return().unwrap();
+        term.delete_line().unwrap();
+        eprintln!("Scan complete");
+    } else {
+        eprintln!("Scanning...");
+    }
+
+    let mut thread_results: Vec<_> = tasks
+        .into_iter()
+        .map(|(thread, _)| thread.join().map_err(std::panic::resume_unwind).unwrap())
+        .collect::<Vec<_>>();
+
+    eprintln!("Results:");
+
+    if thread_results.iter().map(|x| x.len()).sum::<usize>() == 0 {
+        eprintln!("  No results :(");
+    } else {
+        let mut results_buf = vec![];
+        for _ in 0..args.max_matches {
+            results_buf.extend(thread_results.iter_mut().map(|res| res.pop()).flatten());
+            results_buf.sort();
+            match results_buf.pop() {
+                None => break,
+                Some((ct, addr)) => println!("{:08x}: {}", addr, ct),
+            }
+        }
+    }
+
+    Ok(())
+}