GyulyVGC · GyulyVGC · Aug 6, 2026 · Aug 6, 2026 · Aug 6, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All releases with the relative changes are documented in this file.
 
+## [UNRELEASED]
+### Changed
+- Lighten the dependency tree: drop `byteorder` on macOS, and use `windows-sys` instead of `windows` on Windows ([#60](https://github.com/GyulyVGC/listeners/pull/60))
+
 ## [0.6.1] - 2026-08-02
 ### Fixed
 - Correctly report IPv4-mapped IPv6 addresses on macOS ([#57](https://github.com/GyulyVGC/listeners/pull/57) — fixes [#56](https://github.com/GyulyVGC/listeners/issues/56))

diff --git a/Cargo.toml b/Cargo.toml
@@ -24,16 +24,13 @@ print_stdout = "warn"
 print_stderr = "warn"
 
 [target.'cfg(target_os = "windows")'.dependencies]
-windows = { version = "0.62", features = [
+windows-sys = { version = "0.61", features = [
     "Win32_Foundation",
     "Win32_System_Diagnostics_ToolHelp",
     "Win32_System_Threading",
     "Win32_NetworkManagement_IpHelper"
 ] }
 
-[target.'cfg(target_os = "macos")'.dependencies]
-byteorder = "1.5"
-
 [target.'cfg(target_os = "linux")'.dependencies]
 rustix = {version = "1.1", features = ["fs"]}
 

diff --git a/src/platform/macos/c_socket_fd_info.rs b/src/platform/macos/c_socket_fd_info.rs
@@ -1,8 +1,6 @@
 use std::ffi::{c_char, c_int, c_longlong, c_short, c_uchar, c_uint, c_ushort};
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
-use byteorder::{ByteOrder, NetworkEndian};
-
 use crate::platform::macos::proto_listener::ProtoListener;
 use crate::{Protocol, SocketState};
 
@@ -34,13 +32,13 @@ impl CSocketFdInfo {
             }
         };
 
-        let lport_bytes: [u8; 4] = i32::to_le_bytes(general_sock_info.insi_lport);
+        let [lport_hi, lport_lo, ..] = i32::to_le_bytes(general_sock_info.insi_lport);
         let local_address = Self::get_local_addr(family, general_sock_info)?;
         let protocol = Self::get_protocol(family, transport_protocol)?;
 
         let socket_info = ProtoListener::new(
             local_address,
-            NetworkEndian::read_u16(&lport_bytes),
+            u16::from_be_bytes([lport_hi, lport_lo]),
             protocol,
             state,
         );
@@ -82,10 +80,8 @@ impl CSocketFdInfo {
 
     /// The 16-byte `ina_6` slot.
     fn v6_slot(sock_info: &InSockinfo) -> Ipv6Addr {
-        let addr = unsafe { &sock_info.insi_laddr.ina_6.__u6_addr.__u6_addr8 };
-        let mut ipv6_addr = [0_u16; 8];
-        NetworkEndian::read_u16_into(addr, &mut ipv6_addr);
-        Ipv6Addr::from(ipv6_addr)
+        let addr = unsafe { sock_info.insi_laddr.ina_6.__u6_addr.__u6_addr8 };
+        Ipv6Addr::from(addr)
     }
 
     fn get_protocol(family: c_int, ip_protocol: c_int) -> crate::Result<Protocol> {

diff --git a/src/platform/windows/proto_listener.rs b/src/platform/windows/proto_listener.rs
@@ -6,20 +6,19 @@ use crate::platform::windows::tcp_table::TcpTable;
 use crate::platform::windows::tcp6_table::Tcp6Table;
 use std::collections::HashMap;
 use std::collections::hash_map::Entry;
+use std::ffi::CStr;
 use std::mem::size_of;
 use std::mem::zeroed;
 use std::net::{IpAddr, SocketAddr};
 use std::os::windows::ffi::OsStringExt;
 use std::path::Path;
-use windows::Win32::Foundation::CloseHandle;
-use windows::Win32::System::Diagnostics::ToolHelp::{
+use windows_sys::Win32::Foundation::{CloseHandle, FALSE, HANDLE, INVALID_HANDLE_VALUE};
+use windows_sys::Win32::System::Diagnostics::ToolHelp::{
     CreateToolhelp32Snapshot, PROCESSENTRY32, Process32First, Process32Next, TH32CS_SNAPPROCESS,
 };
-use windows::Win32::System::Threading::{
-    OpenProcess, PROCESS_NAME_FORMAT, PROCESS_QUERY_LIMITED_INFORMATION, QueryFullProcessImageNameW,
+use windows_sys::Win32::System::Threading::{
+    OpenProcess, PROCESS_NAME_WIN32, PROCESS_QUERY_LIMITED_INFORMATION, QueryFullProcessImageNameW,
 };
-use windows::core::PCSTR;
-use windows::core::PWSTR;
 
 use super::udp_table::UdpTable;
 use super::udp6_table::Udp6Table;
@@ -149,27 +148,46 @@ impl PidNamePathCache {
     }
 }
 
+fn is_invalid(handle: HANDLE) -> bool {
+    handle.is_null() || handle == INVALID_HANDLE_VALUE
+}
+
+/// Takes a snapshot of the running processes.
+fn process_snapshot() -> Option<HANDLE> {
+    let handle = unsafe { CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) };
+    (!is_invalid(handle)).then_some(handle)
+}
+
+/// Reads the `szExeFile` field of a process entry.
+///
+/// Returns `None` if the field isn't NUL-terminated or isn't valid UTF-8.
+fn exe_file(process: &PROCESSENTRY32) -> Option<String> {
+    let raw = &process.szExeFile;
+    // SAFETY: `c_char` and `u8` share their layout, and the length is taken from the
+    // array itself, so the read stays within `szExeFile` even if the OS didn't
+    // NUL-terminate it.
+    let bytes = unsafe { std::slice::from_raw_parts(raw.as_ptr().cast::<u8>(), raw.len()) };
+    let name = CStr::from_bytes_until_nul(bytes).ok()?;
+    name.to_str().ok().map(str::to_owned)
+}
+
 fn pname(pid: u32) -> Option<String> {
-    let h = unsafe { CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0).ok()? };
+    let dw_size = u32::try_from(size_of::<PROCESSENTRY32>()).ok()?;
+    let h = process_snapshot()?;
 
     let mut process = unsafe { zeroed::<PROCESSENTRY32>() };
-    process.dwSize = u32::try_from(size_of::<PROCESSENTRY32>()).ok()?;
+    process.dwSize = dw_size;
 
     let mut result = None;
 
-    if unsafe { Process32First(h, &raw mut process) }.is_ok() {
+    if unsafe { Process32First(h, &raw mut process) } != FALSE {
         loop {
             if process.th32ProcessID == pid {
-                let name = unsafe {
-                    PCSTR(process.szExeFile.as_ptr().cast::<u8>())
-                        .to_string()
-                        .ok()?
-                };
-                result = Some(name);
+                result = exe_file(&process);
                 break;
             }
 
-            if unsafe { Process32Next(h, &raw mut process) }.is_err() {
+            if unsafe { Process32Next(h, &raw mut process) } == FALSE {
                 break;
             }
         }
@@ -184,10 +202,8 @@ fn pname(pid: u32) -> Option<String> {
 
 fn ppath(pid: u32) -> String {
     unsafe {
-        let Ok(handle) = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, pid) else {
-            return String::new();
-        };
-        if handle.is_invalid() {
+        let handle = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pid);
+        if is_invalid(handle) {
             return String::new();
         }
 
@@ -196,13 +212,13 @@ fn ppath(pid: u32) -> String {
 
         let result = QueryFullProcessImageNameW(
             handle,
-            PROCESS_NAME_FORMAT(0),
-            PWSTR(buffer.as_mut_ptr()),
+            PROCESS_NAME_WIN32,
+            buffer.as_mut_ptr(),
             &raw mut size,
         );
         let _ = CloseHandle(handle);
 
-        if result.is_err() {
+        if result == FALSE {
             return String::new();
         }
 
@@ -214,25 +230,24 @@ fn ppath(pid: u32) -> String {
 fn pname_collect() -> HashMap<u32, String> {
     let mut ret_val = HashMap::default();
 
-    let Ok(h) = (unsafe { CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) }) else {
+    let Ok(dw_size) = u32::try_from(size_of::<PROCESSENTRY32>()) else {
         return ret_val;
     };
-
-    let mut process = unsafe { zeroed::<PROCESSENTRY32>() };
-    let Ok(dw_size) = u32::try_from(size_of::<PROCESSENTRY32>()) else {
+    let Some(h) = process_snapshot() else {
         return ret_val;
     };
+
+    let mut process = unsafe { zeroed::<PROCESSENTRY32>() };
     process.dwSize = dw_size;
 
-    if unsafe { Process32First(h, &raw mut process) }.is_ok() {
+    if unsafe { Process32First(h, &raw mut process) } != FALSE {
         loop {
-            if let Ok(name) = unsafe { PCSTR(process.szExeFile.as_ptr().cast::<u8>()).to_string() }
-            {
+            if let Some(name) = exe_file(&process) {
                 let id = process.th32ProcessID;
                 ret_val.insert(id, name);
             }
 
-            if unsafe { Process32Next(h, &raw mut process) }.is_err() {
+            if unsafe { Process32Next(h, &raw mut process) } == FALSE {
                 break;
             }
         }

diff --git a/src/platform/windows/socket_table.rs b/src/platform/windows/socket_table.rs
@@ -1,18 +1,18 @@
 use std::ffi::{c_ulong, c_void};
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
-use super::statics::UDP_TABLE_OWNER_PID;
 use crate::Protocol;
 use crate::SocketState;
 use crate::platform::target_os::proto_listener::ProtoListener;
-use crate::platform::windows::statics::{
-    AF_INET, AF_INET6, ERROR_INSUFFICIENT_BUFFER, NO_ERROR, TCP_TABLE_OWNER_PID_ALL,
-};
+use crate::platform::windows::statics::{AF_INET, AF_INET6};
 use crate::platform::windows::tcp_table::TcpTable;
 use crate::platform::windows::tcp6_table::Tcp6Table;
 use crate::platform::windows::udp_table::UdpTable;
 use crate::platform::windows::udp6_table::Udp6Table;
-use windows::Win32::NetworkManagement::IpHelper::{GetExtendedTcpTable, GetExtendedUdpTable};
+use windows_sys::Win32::Foundation::{ERROR_INSUFFICIENT_BUFFER, FALSE, NO_ERROR};
+use windows_sys::Win32::NetworkManagement::IpHelper::{
+    GetExtendedTcpTable, GetExtendedUdpTable, TCP_TABLE_OWNER_PID_ALL, UDP_TABLE_OWNER_PID,
+};
 
 pub(super) trait SocketTable {
     fn get_table() -> crate::Result<Vec<u8>>;
@@ -180,9 +180,9 @@ fn get_udp_table(address_family: c_ulong) -> crate::Result<Vec<u8>> {
     let mut table_size: c_ulong = 0;
     let mut err_code = unsafe {
         GetExtendedUdpTable(
-            None,
+            std::ptr::null_mut(),
             &raw mut table_size,
-            false,
+            FALSE,
             address_family,
             UDP_TABLE_OWNER_PID,
             0,
@@ -194,9 +194,9 @@ fn get_udp_table(address_family: c_ulong) -> crate::Result<Vec<u8>> {
         table = Vec::<u8>::with_capacity(table_size as usize);
         err_code = unsafe {
             GetExtendedUdpTable(
-                Some(table.as_mut_ptr().cast::<c_void>()),
+                table.as_mut_ptr().cast::<c_void>(),
                 &raw mut table_size,
-                false,
+                FALSE,
                 address_family,
                 UDP_TABLE_OWNER_PID,
                 0,
@@ -218,9 +218,9 @@ fn get_tcp_table(address_family: c_ulong) -> crate::Result<Vec<u8>> {
     let mut table_size: c_ulong = 0;
     let mut err_code = unsafe {
         GetExtendedTcpTable(
-            None,
+            std::ptr::null_mut(),
             &raw mut table_size,
-            false,
+            FALSE,
             address_family,
             TCP_TABLE_OWNER_PID_ALL,
             0,
@@ -232,9 +232,9 @@ fn get_tcp_table(address_family: c_ulong) -> crate::Result<Vec<u8>> {
         table = Vec::<u8>::with_capacity(table_size as usize);
         err_code = unsafe {
             GetExtendedTcpTable(
-                Some(table.as_mut_ptr().cast::<c_void>()),
+                table.as_mut_ptr().cast::<c_void>(),
                 &raw mut table_size,
-                false,
+                FALSE,
                 address_family,
                 TCP_TABLE_OWNER_PID_ALL,
                 0,

diff --git a/src/platform/windows/statics.rs b/src/platform/windows/statics.rs
@@ -1,9 +1,4 @@
 use std::ffi::c_ulong;
-use windows::Win32::NetworkManagement::IpHelper::{TCP_TABLE_CLASS, UDP_TABLE_CLASS};
 
-pub(super) const TCP_TABLE_OWNER_PID_ALL: TCP_TABLE_CLASS = TCP_TABLE_CLASS(5);
-pub(super) const UDP_TABLE_OWNER_PID: UDP_TABLE_CLASS = UDP_TABLE_CLASS(1);
-pub(super) const ERROR_INSUFFICIENT_BUFFER: c_ulong = 0x7A;
-pub(super) const NO_ERROR: c_ulong = 0;
 pub(super) const AF_INET: c_ulong = 2;
 pub(super) const AF_INET6: c_ulong = 23;