rust/physfs-rs/src/physfs/mod.rs
author Wuzzy <Wuzzy2@mail.ru>
Thu, 14 Nov 2019 17:12:31 +0100
changeset 15526 266ff128a65a
parent 14456 a1613788130d
permissions -rw-r--r--
ASA moon02: Disable hog input after victory Player could briefly move Crazy Runner when skipping final cutscene.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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use std::ffi::{ CString, CStr, OsStr };
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use std::io::Result;
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use std::sync::{ Mutex };
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use libc::{ c_int, c_char };
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/// Keep track of the number of global contexts.
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static mut NUM_CONTEXTS: usize = 0;
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/// Utility
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mod util;
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/// File operations
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pub mod file;
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#[link(name = "physfs")]
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extern {
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    // nonzero on success, zero on error.
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    fn PHYSFS_init(arg0: *const c_char) -> c_int;
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    // nonzero if initialized, zero if not.
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    fn PHYSFS_isInit() -> c_int;
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    // nonzero if success, zero if error.
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    fn PHYSFS_deinit() -> c_int;
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    // string if success, NULL if error.
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    fn PHYSFS_getLastError() -> *const c_char;
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    // nonzero if success, zero if error
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    fn PHYSFS_mount(new_dir: *const c_char, mount_point: *const c_char, append_to_path: c_int) -> c_int;
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    // nonzero if success, zero if error.
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    fn PHYSFS_setWriteDir(write_dir: *const c_char) -> c_int;
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    // nonzero on success, zero on error.
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    fn PHYSFS_mkdir(dir_name: *const c_char) -> c_int;
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    // Checks if a given path exists; returns nonzero if true
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    fn PHYSFS_exists(path: *const c_char) -> c_int;
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    // Checks if a given path is a directory; returns nonzero if true
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    fn PHYSFS_isDirectory(path: *const c_char) -> c_int;
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}
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/// The access point for PhysFS function calls.
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pub struct PhysFSContext;
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unsafe impl Send for PhysFSContext {}
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impl PhysFSContext {
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    /// Creates a new PhysFS context.
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    pub fn new() -> Result<Self> {
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        let con = PhysFSContext;
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        match PhysFSContext::init() {
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            Err(e) => Err(e),
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            _ => {
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                // Everything's gone right so far
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                // now, increment the instance counter
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                println!("Inc");
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                unsafe {
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                    NUM_CONTEXTS += 1;
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                }
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                // and return the newly created context
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                Ok(con)
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            }
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        }
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    }
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    /// initializes the PhysFS library.
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    fn init() -> Result<()> {
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        // Initializing multiple times throws an error. So let's not!
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        if PhysFSContext::is_init() { return Ok(()); }
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        let mut args = ::std::env::args();
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        let default_arg0 = "".to_string();
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        let arg0 = args.next().unwrap_or(default_arg0);
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        let c_arg0 = try!(CString::new(arg0));
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        let ret = unsafe { PHYSFS_init(c_arg0.as_ptr()) };
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        match ret {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Checks if PhysFS is initialized
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    pub fn is_init() -> bool {
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        unsafe { PHYSFS_isInit() != 0 }
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    }
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    /// De-initializes PhysFS. It is recommended to close
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    /// all file handles manually before calling this.
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    fn de_init() {
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        // de_init'ing more than once can cause a double-free -- do not want.
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        if !PhysFSContext::is_init() { return }
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        unsafe {
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            PHYSFS_deinit();
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        }
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    }
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    /// Adds an archive or directory to the search path.
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    /// mount_point is the location in the tree to mount it to.
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    pub fn mount<P>(&self, new_dir: P, mount_point: String, append_to_path: bool) -> Result<()>
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        where P: AsRef<OsStr>
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    {
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        let c_new_dir = CString::new(new_dir.as_ref().to_string_lossy().as_bytes()).unwrap();
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        let c_mount_point = try!(CString::new(mount_point));
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        match unsafe {
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            PHYSFS_mount(
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                c_new_dir.as_c_str().as_ptr(),
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                c_mount_point.as_ptr(),
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                append_to_path as c_int
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            )
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        } {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Gets the last error message in a human-readable format
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    /// This message may be localized, so do not expect it to
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    /// match a specific string of characters.
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    pub fn get_last_error() -> String {
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        let ptr: *const c_char = unsafe {
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            PHYSFS_getLastError()
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        };
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        if ptr.is_null() {
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            return "".to_string()
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        }
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        let buf = unsafe { CStr::from_ptr(ptr).to_bytes().to_vec() };
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        String::from_utf8(buf).unwrap()
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    }
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    /// Sets a new write directory.
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    /// This method will fail if the current write dir
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    /// still has open files in it.
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    pub fn set_write_dir<P>(&self, write_dir: P) -> Result<()>
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        where P: AsRef<OsStr>
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    {
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        let write_dir = CStr::from_bytes_with_nul(write_dir.as_ref().to_str().unwrap().as_bytes()).unwrap();
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        let ret = unsafe {
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            PHYSFS_setWriteDir(write_dir.as_ptr())
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        };
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        match ret {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Creates a new dir relative to the write_dir.
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    pub fn mkdir(&self, dir_name: &str) -> Result<()> {
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        let c_dir_name = try!(CString::new(dir_name));
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        let ret = unsafe {
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            PHYSFS_mkdir(c_dir_name.as_ptr())
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        };
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        match ret {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Checks if given path exists
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    pub fn exists(&self, path: &str) -> Result<()> {
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        let c_path = try!(CString::new(path));
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        let ret = unsafe { PHYSFS_exists(c_path.as_ptr()) };
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        match ret {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Checks if given path is a directory
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    pub fn is_directory(&self, path: &str) -> Result<()> {
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        let c_path = try!(CString::new(path));
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        let ret = unsafe { PHYSFS_isDirectory(c_path.as_ptr()) };
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        match ret {
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            0 => Err(util::physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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}
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impl Drop for PhysFSContext {
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    fn drop(&mut self) {
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        // decrement NUM_CONTEXTS
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        unsafe {
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            NUM_CONTEXTS -= 1;
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        }
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        // and de_init if there aren't any contexts left.
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        if unsafe { NUM_CONTEXTS == 0 } {
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            PhysFSContext::de_init();
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        }
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    }
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}