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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::RngCore for FakePRNG<'a> {
fn next_u32(&mut self) -> u32 {
rand_core::impls::next_u32_via_fill(self)
}
fn next_u64(&mut self) -> u64 {
rand_core::impls::next_u64_via_fill(self)
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> std::result::Result<(), rand_core::Error> {
self.fill_bytes(dest);
Ok(())
}
fn fill_bytes(&mut self, dest: &mut [u8]) {
assert!(dest.len() <= self.bytes.len());
dest.copy_from_slice(&self.bytes[0..dest.len()]);
self.bytes = &self.bytes[dest.len()..];
}
}
impl rand_core::CryptoRng for FakePRNG<'_> {}
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