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use ::{ NifEnv, NifError, NifResult, NifTerm, NifEncoder, NifDecoder };
use ::wrapper::nif_interface;
use ::wrapper::binary::{ ErlNifBinary, alloc, realloc };
use ::std::io::Write;
use ::std::borrow::{ Borrow, BorrowMut };
use ::std::ops::{ Deref, DerefMut };
pub struct OwnedNifBinary {
inner: ErlNifBinary,
release: bool,
}
impl<'a> OwnedNifBinary {
pub fn new(size: usize) -> Option<OwnedNifBinary> {
unsafe { alloc(size) }.map(|binary| {
OwnedNifBinary {
inner: binary,
release: true,
}
})
}
pub fn from_unowned(from_bin: &NifBinary) -> Option<OwnedNifBinary> {
let len = from_bin.len();
if let Some(mut bin) = OwnedNifBinary::new(len) {
if let Ok(write_len) = bin.as_mut_slice().write(from_bin.as_slice()) {
if write_len != len {
panic!("Could not copy binary");
}
Some(bin)
} else {
panic!("Could not copy binary");
}
} else {
None
}
}
#[must_use]
pub fn realloc(&mut self, size: usize) -> bool {
unsafe { realloc(&mut self.inner, size) }
}
pub fn realloc_or_copy(&mut self, size: usize) {
if !self.realloc(size) {
let mut new = OwnedNifBinary::new(size).unwrap();
if let Ok(num_written) = new.as_mut_slice().write(self.as_slice()) {
if !(num_written == self.len() || num_written == new.len()) {
panic!("Could not copy binary");
}
::std::mem::swap(&mut self.inner, &mut new.inner);
} else {
panic!("Could not copy binary");
}
}
}
pub fn as_slice(&self) -> &'a [u8] {
unsafe { ::std::slice::from_raw_parts(self.inner.data, self.inner.size) }
}
pub fn as_mut_slice(&mut self) -> &'a mut [u8] {
unsafe { ::std::slice::from_raw_parts_mut(self.inner.data, self.inner.size) }
}
pub fn release<'b>(self, env: NifEnv<'b>) -> NifBinary<'b> {
NifBinary::from_owned(self, env)
}
}
impl Borrow<[u8]> for OwnedNifBinary {
fn borrow(&self) -> &[u8] {
self.as_slice()
}
}
impl BorrowMut<[u8]> for OwnedNifBinary {
fn borrow_mut(&mut self) -> &mut [u8] {
self.as_mut_slice()
}
}
impl Deref for OwnedNifBinary {
type Target = [u8];
fn deref(&self) -> &[u8] {
self.as_slice()
}
}
impl DerefMut for OwnedNifBinary {
fn deref_mut(&mut self) -> &mut [u8] {
self.as_mut_slice()
}
}
impl Drop for OwnedNifBinary {
fn drop(&mut self) {
if self.release {
unsafe { nif_interface::enif_release_binary(self.inner.as_c_arg()) };
}
}
}
unsafe impl Send for OwnedNifBinary {}
#[derive(Copy, Clone)]
pub struct NifBinary<'a> {
inner: ErlNifBinary,
term: NifTerm<'a>,
}
impl<'a> NifBinary<'a> {
pub fn from_owned(mut bin: OwnedNifBinary, env: NifEnv<'a>) -> Self {
bin.release = false;
let term = unsafe { NifTerm::new(env, nif_interface::enif_make_binary(env.as_c_arg(), bin.inner.as_c_arg())) };
NifBinary {
inner: bin.inner.clone(),
term: term,
}
}
pub unsafe fn from_raw(env: NifEnv<'a>, bin: ErlNifBinary) -> NifBinary<'a> {
NifBinary {
inner: bin,
term: NifTerm::new(env, bin.bin_term),
}
}
pub fn to_owned(&self) -> Option<OwnedNifBinary> {
OwnedNifBinary::from_unowned(self)
}
pub fn from_term(term: NifTerm<'a>) -> Result<Self, NifError> {
let mut binary = unsafe { ErlNifBinary::new_empty() };
if unsafe { nif_interface::enif_inspect_binary(term.get_env().as_c_arg(), term.as_c_arg(), binary.as_c_arg()) } == 0 {
return Err(NifError::BadArg);
}
Ok(NifBinary {
inner: binary,
term: term,
})
}
pub fn to_term<'b>(&self, env: NifEnv<'b>) -> NifTerm<'b> {
self.term.in_env(env)
}
pub fn as_slice(&self) -> &'a [u8] {
unsafe { ::std::slice::from_raw_parts(self.inner.data, self.inner.size) }
}
pub fn make_subbinary(&self, offset: usize, length: usize) -> NifResult<NifBinary<'a>> {
let min_len = length.checked_add(offset);
if try!(min_len.ok_or(NifError::BadArg)) > self.inner.size {
return Err(NifError::BadArg);
}
let raw_term = unsafe { nif_interface::enif_make_sub_binary(self.term.get_env().as_c_arg(), self.inner.bin_term, offset, length) };
let term = unsafe { NifTerm::new(self.term.get_env(), raw_term) };
Ok(NifBinary::from_term(term).ok().unwrap())
}
}
impl<'a> Borrow<[u8]> for NifBinary<'a> {
fn borrow(&self) -> &[u8] {
self.as_slice()
}
}
impl<'a> Deref for NifBinary<'a> {
type Target = [u8];
fn deref(&self) -> &[u8] {
self.as_slice()
}
}
impl<'a> NifDecoder<'a> for NifBinary<'a> {
fn decode(term: NifTerm<'a>) -> Result<Self, NifError> {
NifBinary::from_term(term)
}
}
impl<'a> NifEncoder for NifBinary<'a> {
fn encode<'b>(&self, env: NifEnv<'b>) -> NifTerm<'b> {
self.to_term(env)
}
}
impl<'a> NifTerm<'a> {
pub fn into_binary(self) -> NifResult<NifBinary<'a>> {
NifBinary::from_term(self)
}
}