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use std::ffi::CString;
use std::io;
use std::path::Path;
use std::marker::PhantomData;
use libc::{c_int, size_t, c_char};
use libc::c_void;
use crate::get_error;
use std::mem::transmute;
use crate::sys;
pub struct RWops<'a> {
raw: *mut sys::SDL_RWops,
_marker: PhantomData<&'a ()>
}
impl<'a> RWops<'a> {
pub unsafe fn raw(&self) -> *mut sys::SDL_RWops { self.raw }
pub unsafe fn from_ll<'b>(raw: *mut sys::SDL_RWops) -> RWops<'b> {
RWops {
raw,
_marker: PhantomData
}
}
pub fn from_file<P: AsRef<Path>>(path: P, mode: &str) -> Result<RWops <'static>, String> {
let raw = unsafe {
let path_c = CString::new(path.as_ref().to_str().unwrap()).unwrap();
let mode_c = CString::new(mode).unwrap();
sys::SDL_RWFromFile(path_c.as_ptr() as *const c_char, mode_c.as_ptr() as *const c_char)
};
if raw.is_null() {
Err(get_error())
} else {
Ok(RWops {
raw,
_marker: PhantomData
})
}
}
pub fn from_bytes(buf: &'a [u8]) -> Result<RWops <'a>, String> {
let raw = unsafe {
sys::SDL_RWFromConstMem(buf.as_ptr() as *const c_void, buf.len() as c_int)
};
if raw.is_null() {
Err(get_error())
} else {
Ok(RWops {
raw,
_marker: PhantomData
})
}
}
pub fn from_read<T>(r: &mut T, buffer: &'a mut Vec<u8>) -> Result<RWops<'a>, String>
where T: io::Read + Sized {
match r.read_to_end(buffer) {
Ok(_size) => RWops::from_bytes(buffer),
Err(ioerror) => {
let msg = format!("IO error: {}", ioerror);
Err(msg)
}
}
}
pub fn from_bytes_mut(buf: &'a mut [u8]) -> Result<RWops <'a>, String> {
let raw = unsafe {
sys::SDL_RWFromMem(buf.as_ptr() as *mut c_void, buf.len() as c_int)
};
if raw.is_null() {
Err(get_error())
} else {
Ok(RWops {
raw,
_marker: PhantomData
})
}
}
pub fn len(&self) -> Option<usize> {
let result = unsafe { ((*self.raw).size.unwrap())(self.raw) };
match result {
-1 => None,
v => Some(v as usize)
}
}
pub fn is_empty(&self) -> bool {
match self.len() {
Some(s) => s == 0,
None => true,
}
}
}
impl<'a> Drop for RWops<'a> {
fn drop(&mut self) {
let ret = unsafe { ((*self.raw).close.unwrap())(self.raw) };
if ret != 0 {
panic!(get_error());
}
}
}
impl<'a> io::Read for RWops<'a> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let out_len = buf.len() as size_t;
let ret = unsafe {
((*self.raw).read.unwrap())(self.raw, buf.as_ptr() as *mut c_void, 1, out_len as sys::size_t)
};
Ok(ret as usize)
}
}
impl<'a> io::Write for RWops<'a> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let in_len = buf.len() as size_t;
let ret = unsafe {
((*self.raw).write.unwrap())(self.raw, buf.as_ptr() as *const c_void, 1, in_len as sys::size_t)
};
Ok(ret as usize)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl<'a> io::Seek for RWops<'a> {
fn seek(&mut self, pos: io::SeekFrom) -> io::Result<u64> {
let (whence, offset) = match pos {
io::SeekFrom::Start(pos) => (sys::RW_SEEK_SET, pos as i64),
io::SeekFrom::End(pos) => (sys::RW_SEEK_END, pos),
io::SeekFrom::Current(pos) => (sys::RW_SEEK_CUR, pos)
};
let ret = unsafe {
((*self.raw).seek.unwrap())(self.raw, offset, transmute(whence))
};
if ret == -1 {
Err(io::Error::last_os_error())
} else {
Ok(ret as u64)
}
}
}