rust/physfs-rs/src/physfs/file.rs
author alfadur
Wed, 21 Oct 2020 18:55:26 +0300
changeset 15751 a4558e2be08c
parent 14435 a1613788130d
permissions -rw-r--r--
add more const qualifiers to maintain a semblance of activity
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use std::ffi::CString;
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use std::io::{ Read, Write, Seek, SeekFrom, Result };
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use std::mem;
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use libc::{ c_int, c_char, c_void };
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use primitives::*;
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use super::{ PhysFSContext };
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use super::util::physfs_error_as_io_error;
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#[link(name = "physfs")]
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extern {
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    // valid filehandle on success, NULL on failure
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    fn PHYSFS_openAppend(filename: *const c_char) -> *const RawFile;
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    fn PHYSFS_openRead(filename: *const c_char) -> *const RawFile;
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    fn PHYSFS_openWrite(filename: *const c_char) -> *const RawFile;
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    // nonzero on success, 0 on failure (and the handle stays open)
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    // The docs make it sound like failure is rare.
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    fn PHYSFS_close(file: *const RawFile) -> c_int;
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    // Number of bytes read on success, -1 on failure.
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    fn PHYSFS_read(file: *const RawFile, buffer: *mut c_void,
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                   obj_size: PHYSFS_uint32, obj_count: PHYSFS_uint32) -> PHYSFS_sint64;
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    // Number of bytes written on success, -1 on failure.
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    fn PHYSFS_write(file: *const RawFile, buffer: *const c_void,
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                    obj_size: PHYSFS_uint32, obj_count: PHYSFS_uint32) -> PHYSFS_sint64;
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    // Flush buffered file; no-op for unbuffered files.
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    fn PHYSFS_flush(file: *const RawFile) -> c_int;
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    // Seek to position in file; nonzero on succss, zero on error.
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    fn PHYSFS_seek(file: *const RawFile, pos: PHYSFS_uint64) -> c_int;
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    // Current position in file, -1 on failure.
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    fn PHYSFS_tell(file: *const RawFile) -> PHYSFS_sint64;
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    // nonzero if EOF, zero if not.
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    fn PHYSFS_eof(file: *const RawFile) -> c_int;
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    // Determine file size; returns -1 if impossible
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    fn PHYSFS_fileLength(file: *const RawFile) -> PHYSFS_sint64;
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}
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/// Possible ways to open a file.
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#[derive(Copy, Clone)]
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pub enum Mode {
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    /// Append to the end of the file.
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    Append,
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    /// Read from the file.
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    Read,
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    /// Write to the file, overwriting previous data.
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    Write,
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}
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/// A wrapper for the PHYSFS_File type.
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#[repr(C)]
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struct RawFile {
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    opaque: *const c_void,
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}
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/// A file handle.
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#[allow(dead_code)]
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pub struct File<'f> {
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    raw: *const RawFile,
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    mode: Mode,
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    context: &'f PhysFSContext,
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}
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impl<'f> File<'f> {
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    /// Opens a file with a specific mode.
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    pub fn open<'g>(context: &'g PhysFSContext, filename: String, mode: Mode) -> Result<File<'g>> {
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        let c_filename = try!(CString::new(filename));
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        let raw = unsafe { match mode {
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            Mode::Append => PHYSFS_openAppend(c_filename.as_ptr()),
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            Mode::Read => PHYSFS_openRead(c_filename.as_ptr()),
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            Mode::Write => PHYSFS_openWrite(c_filename.as_ptr())
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        }};
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        if raw.is_null() {
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            Err(physfs_error_as_io_error())
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        }
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        else {
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            Ok(File{raw: raw, mode: mode, context: context})
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        }
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    }
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    /// Closes a file handle.
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    fn close(&self) -> Result<()> {
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        match unsafe {
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            PHYSFS_close(self.raw)
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        } {
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            0 => Err(physfs_error_as_io_error()),
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            _ => Ok(())
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        }
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    }
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    /// Checks whether eof is reached or not.
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    pub fn eof(&self) -> bool {
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        let ret = unsafe {
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            PHYSFS_eof(self.raw)
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        };
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        ret != 0
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    }
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    /// Determine length of file, if possible
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    pub fn len(&self) -> Result<u64> {
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        let len = unsafe { PHYSFS_fileLength(self.raw) };
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        if len >= 0 {
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            Ok(len as u64)
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        } else {
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            Err(physfs_error_as_io_error())
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        }
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    }
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    /// Determines current position within a file
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    pub fn tell(&self) -> Result<u64> {
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        let ret = unsafe {
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            PHYSFS_tell(self.raw)
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        };
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        match ret {
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            -1 => Err(physfs_error_as_io_error()),
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            _ => Ok(ret as u64)
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        }
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    }
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}
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impl<'f> Read for File<'f> {
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    /// Reads from a file
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    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
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        let ret = unsafe {
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            PHYSFS_read(
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                self.raw,
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                buf.as_ptr() as *mut c_void,
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                mem::size_of::<u8>() as PHYSFS_uint32,
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                buf.len() as PHYSFS_uint32
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            )
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        };
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        match ret {
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            -1 => Err(physfs_error_as_io_error()),
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            _ => Ok(ret as usize)
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        }
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    }
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}
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impl<'f> Write for File<'f> {
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    /// Writes to a file.
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    /// This code performs no safety checks to ensure
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    /// that the buffer is the correct length.
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    fn write(&mut self, buf: &[u8]) -> Result<usize> {
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        let ret = unsafe {
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            PHYSFS_write(
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                self.raw,
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                buf.as_ptr() as *const c_void,
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                mem::size_of::<u8>() as PHYSFS_uint32,
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                buf.len() as PHYSFS_uint32
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            )
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        };
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        match ret {
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            -1 => Err(physfs_error_as_io_error()),
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            _ => Ok(ret as usize)
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        }
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    }
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    /// Flushes a file if buffered; no-op if unbuffered.
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    fn flush(&mut self) -> Result<()> {
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        let ret = unsafe {
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            PHYSFS_flush(self.raw)
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        };
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        match ret {
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            0 => Err(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<'f> Seek for File<'f> {
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    /// Seek to a new position within a file
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    fn seek(&mut self, pos: SeekFrom) -> Result<u64> {
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        let seek_pos = match pos {
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            SeekFrom::Start(n) => n as i64,
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            SeekFrom::End(n) => {
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                let len = try!(self.len());
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                n + len as i64
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            }
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            SeekFrom::Current(n) => {
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                let curr_pos = try!(self.tell());
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                n + curr_pos as i64
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            }
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        };
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        let result = unsafe {
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            PHYSFS_seek(
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                self.raw,
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                seek_pos as PHYSFS_uint64
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            )
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        };
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        if result == -1 {
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            return Err(physfs_error_as_io_error());
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        }
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        self.tell()
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    }
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}
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impl<'f> Drop for File<'f> {
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    fn drop(&mut self) {
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        let _ = self.close();
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    }
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}