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// Take a look at the license at the top of the repository in the LICENSE file.
use super::internal_buffer::Buffer;
use std::{
fmt,
io::{Error, Read},
};
pub struct InternalReader<R> {
read: R,
buffer_size: usize,
buffer: Buffer,
}
impl<R: Read> InternalReader<R> {
pub fn new(mut read: R, buffer_size: usize) -> Result<Self, Error> {
let mut buffer = Buffer::new(buffer_size);
InternalReader::read_data(&mut read, &mut buffer)?;
Ok(InternalReader {
read,
buffer_size,
buffer,
})
}
fn read_data(read: &mut R, buffer: &mut Buffer) -> Result<(), Error> {
let size = read.read(buffer.as_mut())?;
buffer.update_metadata(size);
Ok(())
}
}
impl<R: Read + fmt::Debug> fmt::Debug for InternalReader<R> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("JsonReader")
.field("read", &self.read)
.field("buffer_size", &self.buffer_size)
.field("buffer", &self.buffer)
.finish()
}
}
impl<R: Read> Iterator for InternalReader<R> {
type Item = Result<u8, Error>;
#[inline]
fn next(&mut self) -> Option<Result<u8, Error>> {
if self.buffer_size == 0 {
return None;
}
loop {
if let Some(item) = self.buffer.next() {
return Some(Ok(item));
} else if self.buffer.cont() {
if let Err(err) = InternalReader::read_data(&mut self.read, &mut self.buffer) {
return Some(Err(err));
};
} else {
return None;
}
}
}
}
|
