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// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Implementation for Fuchsia Zircon
extern crate fuchsia_zircon;
use rand_core::{Error, ErrorKind};
use super::OsRngImpl;
#[derive(Clone, Debug)]
pub struct OsRng;
impl OsRngImpl for OsRng {
fn new() -> Result<OsRng, Error> { Ok(OsRng) }
fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> {
let mut read = 0;
while read < dest.len() {
match fuchsia_zircon::cprng_draw(&mut dest[read..]) {
Ok(actual) => read += actual,
Err(e) => {
return Err(Error::with_cause(
ErrorKind::Unavailable,
"cprng_draw failed",
e.into_io_error()));
}
};
}
Ok(())
}
fn max_chunk_size(&self) -> usize {
fuchsia_zircon::sys::ZX_CPRNG_DRAW_MAX_LEN
}
fn method_str(&self) -> &'static str { "cprng_draw" }
}
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