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Copy pathcopy.rs
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99 lines (87 loc) · 3.16 KB
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Copy pathcopy.rs
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99 lines (87 loc) · 3.16 KB
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use crate::{ReadText, ReadTextLayered, TextSubstr, WriteText};
use layered_io::Bufferable;
use std::cmp::max;
use std::io;
/// Like [`std::io::copy`], but for streams that can operate directly on text
/// strings, so we can avoid re-validating them as text.
pub fn copy_text<R: ReadText + Bufferable + ?Sized, W: WriteText + Bufferable + ?Sized>(
reader: &mut R,
writer: &mut W,
) -> io::Result<u64> {
// TODO: Avoid unnecessary zero-initialization.
let mut buf = unsafe { TextSubstr::from_text_unchecked(" ") }.repeat(max(
reader.suggested_buffer_size(),
writer.suggested_buffer_size(),
));
let mut written = 0;
loop {
let len = match reader.read_text_substr(&mut buf) {
Ok(0) => break,
Ok(nread) => nread,
Err(err) if err.kind() == io::ErrorKind::Interrupted => continue,
Err(err) => return Err(err),
};
writer.write_text_substr(&buf[..len])?;
written += len as u64;
}
Ok(written)
}
/// Like [`std::io::copy`], but for streams that can operate directly on text
/// strings, so we can avoid re-validating them as text.
///
/// Also, like `copy_text`, but uses `read_text_substr_with_status` to avoid
/// performing an extra `read` at the end.
pub fn copy_text_using_status<R: ReadTextLayered + ?Sized, W: WriteText + Bufferable + ?Sized>(
reader: &mut R,
writer: &mut W,
) -> io::Result<u64> {
// TODO: Avoid unnecessary zero-initialization.
let mut buf = unsafe { TextSubstr::from_text_unchecked(" ") }.repeat(max(
reader.suggested_buffer_size(),
writer.suggested_buffer_size(),
));
let mut written = 0;
loop {
let (len, status) = reader.read_text_substr_with_status(&mut buf)?;
writer.write_text_substr(&buf[..len])?;
written += len as u64;
if status.is_end() {
return Ok(written);
}
if status.is_push() {
writer.flush()?;
}
}
}
#[test]
fn test_copy_text() {
use crate::{TextReader, TextStr, TextWriter};
use std::io::Cursor;
use std::str;
let text = "hello world ☃\n";
let mut input = TextReader::new(Cursor::new(text.to_owned()));
let mut output = TextWriter::new(Vec::new());
copy_text(&mut input, &mut output).unwrap();
let ext = output.close_into_inner().unwrap();
let vec = ext.abandon_into_inner().abandon_into_inner().unwrap();
let s = str::from_utf8(&vec).unwrap();
assert_eq!(s, text);
let t = TextStr::from_text(s).unwrap();
assert_eq!(t, text);
}
#[test]
fn test_copy_text_using_status() {
use crate::{TextReader, TextStr, TextWriter};
use std::io::Cursor;
use std::str;
let text = "hello world ☃";
let mut input = TextReader::new(Cursor::new(text.to_owned()));
let mut output = TextWriter::new(Vec::new());
copy_text_using_status(&mut input, &mut output).unwrap();
let ext = output.close_into_inner().unwrap();
let vec = ext.abandon_into_inner().abandon_into_inner().unwrap();
let s = str::from_utf8(&vec).unwrap();
assert_eq!(s, &format!("{}\n", text));
let t = TextStr::from_text(s).unwrap();
assert_eq!(t, &format!("{}\n", text));
}