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use crate::decode::IntoAsync;
use crate::error::LzwStatus;
use crate::error::StreamResult;
use crate::StreamBuf;
use std::io;
impl<'d, W: futures::io::AsyncWrite + core::marker::Unpin> IntoAsync<'d, W> {
pub async fn decode(&mut self, read: impl futures::io::AsyncBufRead) -> StreamResult {
self.decode_part(read, false).await
}
pub async fn decode_all(mut self, read: impl futures::io::AsyncBufRead) -> StreamResult {
self.decode_part(read, true).await
}
pub fn set_buffer_size(&mut self, size: usize) {
assert_ne!(size, 0, "Attempted to set empty buffer");
self.default_size = size;
}
pub fn set_buffer(&mut self, buffer: &'d mut [u8]) {
assert_ne!(buffer.len(), 0, "Attempted to set empty buffer");
self.buffer = Some(StreamBuf::Borrowed(buffer));
}
async fn decode_part(
&mut self,
read: impl futures::io::AsyncBufRead,
must_finish: bool,
) -> StreamResult {
use futures::io::AsyncBufReadExt;
use futures::io::AsyncWriteExt;
let IntoAsync {
decoder,
writer,
buffer,
default_size,
} = self;
futures::pin_mut!(read);
let mut read: core::pin::Pin<_> = read;
let mut bytes_read = 0;
let mut bytes_written = 0;
let read_bytes = &mut bytes_read;
let write_bytes = &mut bytes_written;
let outbuf: &mut [u8] =
match { buffer.get_or_insert_with(|| StreamBuf::Owned(vec![0u8; *default_size])) } {
StreamBuf::Borrowed(slice) => &mut *slice,
StreamBuf::Owned(vec) => &mut *vec,
};
assert!(!outbuf.is_empty());
let status = loop {
let mut filler = read.as_mut();
let data = match filler.fill_buf().await {
Ok(buf) => buf,
Err(err) => break Err(err),
};
let result = decoder.decode_bytes(data, &mut outbuf[..]);
*read_bytes += result.consumed_in;
*write_bytes += result.consumed_out;
read.as_mut().consume(result.consumed_in);
let status = match result.status {
Ok(ok) => ok,
Err(err) => {
break Err(io::Error::new(
io::ErrorKind::InvalidData,
&*format!("{:?}", err),
));
}
};
if let LzwStatus::NoProgress = status {
debug_assert_eq!(
result.consumed_out, 0,
"No progress means we have not decoded any data"
);
if must_finish {
break Err(io::Error::new(
io::ErrorKind::UnexpectedEof,
"No more data but no end marker detected",
));
} else {
break Ok(());
}
}
match writer.write_all(&outbuf[..result.consumed_out]).await {
Ok(_) => {}
Err(err) => break Err(err),
}
if let LzwStatus::Done = status {
break Ok(());
}
};
StreamResult {
bytes_read,
bytes_written,
status,
}
}
}