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//! Streaming PEM writer.
use super::Writer;
use crate::Result;
use pem_rfc7468::{Encoder, LineEnding};
/// `Writer` type which outputs PEM-encoded data.
pub struct PemWriter<'w>(Encoder<'static, 'w>);
impl<'w> PemWriter<'w> {
/// Create a new PEM writer which outputs into the provided buffer.
///
/// Uses the default 64-character line wrapping.
pub fn new(
type_label: &'static str,
line_ending: LineEnding,
out: &'w mut [u8],
) -> Result<Self> {
Ok(Self(Encoder::new(type_label, line_ending, out)?))
}
/// Get the PEM label which will be used in the encapsulation boundaries
/// for this document.
pub fn type_label(&self) -> &'static str {
self.0.type_label()
}
/// Finish encoding PEM, writing the post-encapsulation boundary.
///
/// On success, returns the total number of bytes written to the output buffer.
pub fn finish(self) -> Result<usize> {
Ok(self.0.finish()?)
}
}
impl Writer for PemWriter<'_> {
fn write(&mut self, slice: &[u8]) -> Result<()> {
self.0.encode(slice)?;
Ok(())
}
}
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