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use std::io::copy;
use std::io::{Read, Result, Seek, SeekFrom, Write};
use zstd::stream::{read::Decoder, write::Encoder};
use crate::{com::ByteCount, Compressor, Decompress, Decompressor};
#[derive(Debug, Copy, Clone)]
pub struct ZstdDecompressor;
impl Decompressor for ZstdDecompressor {
fn new() -> Self {
ZstdDecompressor
}
fn copy<R: Read, W: Write>(&self, source: R, mut dest: W) -> Result<u64> {
let mut decoder = Decoder::new(source)?;
copy(&mut decoder, &mut dest)
}
fn from_reader<R: Read, V: Decompress>(&self, reader: R) -> Result<V>
where
Self: Sized,
{
let decoder = Decoder::new(reader)?;
V::from_reader(decoder)
}
}
#[derive(Debug, Copy, Clone)]
pub struct ZstdCompressor;
impl Compressor for ZstdCompressor {
fn new() -> Self {
ZstdCompressor
}
fn compress<W: Write + Seek, R: Read>(
&self,
writer: &mut W,
reader: &mut R,
) -> Result<ByteCount> {
let start = writer.seek(SeekFrom::Current(0))?;
let mut encoder = Encoder::new(writer, 21)?;
let read = copy(reader, &mut encoder)?;
let writer = encoder.finish()?;
let end = writer.seek(SeekFrom::Current(0))?;
let write = end - start;
Ok(ByteCount { read, write })
}
}