diff -r 632dfc73cf83 -r a1613788130d rust/physfs-rs/src/physfs/mod.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/physfs-rs/src/physfs/mod.rs	Thu Dec 13 23:44:46 2018 +0100
@@ -0,0 +1,190 @@
+use std::ffi::{ CString, CStr, OsStr };
+use std::io::Result;
+use std::sync::{ Mutex };
+use libc::{ c_int, c_char };
+
+/// Keep track of the number of global contexts.
+static mut NUM_CONTEXTS: usize = 0;
+
+/// Utility
+mod util;
+/// File operations
+pub mod file;
+
+#[link(name = "physfs")]
+extern {
+    // nonzero on success, zero on error.
+    fn PHYSFS_init(arg0: *const c_char) -> c_int;
+    // nonzero if initialized, zero if not.
+    fn PHYSFS_isInit() -> c_int;
+    // nonzero if success, zero if error.
+    fn PHYSFS_deinit() -> c_int;
+    // string if success, NULL if error.
+    fn PHYSFS_getLastError() -> *const c_char;
+    // nonzero if success, zero if error
+    fn PHYSFS_mount(new_dir: *const c_char, mount_point: *const c_char, append_to_path: c_int) -> c_int;
+    // nonzero if success, zero if error.
+    fn PHYSFS_setWriteDir(write_dir: *const c_char) -> c_int;
+    // nonzero on success, zero on error.
+    fn PHYSFS_mkdir(dir_name: *const c_char) -> c_int;
+    // Checks if a given path exists; returns nonzero if true
+    fn PHYSFS_exists(path: *const c_char) -> c_int;
+    // Checks if a given path is a directory; returns nonzero if true
+    fn PHYSFS_isDirectory(path: *const c_char) -> c_int;
+}
+
+/// The access point for PhysFS function calls.
+pub struct PhysFSContext;
+
+unsafe impl Send for PhysFSContext {}
+
+impl PhysFSContext {
+    /// Creates a new PhysFS context.
+    pub fn new() -> Result<Self> {
+        let con = PhysFSContext;
+        match PhysFSContext::init() {
+            Err(e) => Err(e),
+            _ => {
+                // Everything's gone right so far
+                // now, increment the instance counter
+                println!("Inc");
+                unsafe {
+                    NUM_CONTEXTS += 1;
+                }
+                // and return the newly created context
+                Ok(con)
+            }
+        }
+    }
+
+    /// initializes the PhysFS library.
+    fn init() -> Result<()> {
+        // Initializing multiple times throws an error. So let's not!
+        if PhysFSContext::is_init() { return Ok(()); }
+
+        let mut args = ::std::env::args();
+        let default_arg0 = "".to_string();
+        let arg0 = args.next().unwrap_or(default_arg0);
+        let c_arg0 = try!(CString::new(arg0));
+        let ret = unsafe { PHYSFS_init(c_arg0.as_ptr()) };
+
+        match ret {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+
+    /// Checks if PhysFS is initialized
+    pub fn is_init() -> bool {
+        unsafe { PHYSFS_isInit() != 0 }
+    }
+
+    /// De-initializes PhysFS. It is recommended to close
+    /// all file handles manually before calling this.
+    fn de_init() {
+        // de_init'ing more than once can cause a double-free -- do not want.
+        if !PhysFSContext::is_init() { return }
+        unsafe {
+            PHYSFS_deinit();
+        }
+    }
+    /// Adds an archive or directory to the search path.
+    /// mount_point is the location in the tree to mount it to.
+    pub fn mount<P>(&self, new_dir: P, mount_point: String, append_to_path: bool) -> Result<()>
+        where P: AsRef<OsStr>
+    {
+        let c_new_dir = CString::new(new_dir.as_ref().to_string_lossy().as_bytes()).unwrap();
+        let c_mount_point = try!(CString::new(mount_point));
+        match unsafe {
+            PHYSFS_mount(
+                c_new_dir.as_c_str().as_ptr(),
+                c_mount_point.as_ptr(),
+                append_to_path as c_int
+            )
+        } {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+
+    /// Gets the last error message in a human-readable format
+    /// This message may be localized, so do not expect it to
+    /// match a specific string of characters.
+    pub fn get_last_error() -> String {
+        let ptr: *const c_char = unsafe {
+            PHYSFS_getLastError()
+        };
+        if ptr.is_null() {
+            return "".to_string()
+        }
+
+        let buf = unsafe { CStr::from_ptr(ptr).to_bytes().to_vec() };
+
+        String::from_utf8(buf).unwrap()
+    }
+
+    /// Sets a new write directory.
+    /// This method will fail if the current write dir
+    /// still has open files in it.
+    pub fn set_write_dir<P>(&self, write_dir: P) -> Result<()>
+        where P: AsRef<OsStr>
+    {
+        let write_dir = CStr::from_bytes_with_nul(write_dir.as_ref().to_str().unwrap().as_bytes()).unwrap();
+        let ret = unsafe {
+            PHYSFS_setWriteDir(write_dir.as_ptr())
+        };
+
+        match ret {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+
+    /// Creates a new dir relative to the write_dir.
+    pub fn mkdir(&self, dir_name: &str) -> Result<()> {
+        let c_dir_name = try!(CString::new(dir_name));
+        let ret = unsafe {
+            PHYSFS_mkdir(c_dir_name.as_ptr())
+        };
+
+        match ret {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+
+    /// Checks if given path exists
+    pub fn exists(&self, path: &str) -> Result<()> {
+        let c_path = try!(CString::new(path));
+        let ret = unsafe { PHYSFS_exists(c_path.as_ptr()) };
+
+        match ret {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+
+    /// Checks if given path is a directory
+    pub fn is_directory(&self, path: &str) -> Result<()> {
+        let c_path = try!(CString::new(path));
+        let ret = unsafe { PHYSFS_isDirectory(c_path.as_ptr()) };
+
+        match ret {
+            0 => Err(util::physfs_error_as_io_error()),
+            _ => Ok(())
+        }
+    }
+}
+
+impl Drop for PhysFSContext {
+    fn drop(&mut self) {
+        // decrement NUM_CONTEXTS
+        unsafe {
+            NUM_CONTEXTS -= 1;
+        }
+        // and de_init if there aren't any contexts left.
+        if unsafe { NUM_CONTEXTS == 0 } {
+            PhysFSContext::de_init();
+        }
+    }
+}