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use std::convert::Infallible;
pub(crate) struct FakePRNG<'a> {
bytes: &'a [u8],
}
impl<'a> FakePRNG<'a> {
pub(crate) fn new(bytes: &'a [u8]) -> Self {
Self { bytes }
}
}
impl<'a> rand_core::TryRng for FakePRNG<'a> {
type Error = Infallible;
fn try_next_u32(&mut self) -> Result<u32, Infallible> {
rand_core::utils::next_word_via_fill(self)
}
fn try_next_u64(&mut self) -> Result<u64, Infallible> {
rand_core::utils::next_word_via_fill(self)
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Infallible> {
assert!(dest.len() <= self.bytes.len());
dest.copy_from_slice(&self.bytes[0..dest.len()]);
self.bytes = &self.bytes[dest.len()..];
Ok(())
}
}
impl rand_core::TryCryptoRng for FakePRNG<'_> {}
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