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use std;
use std::io::{Read, Write};
pub mod raw;
#[cfg(feature = "bzip")]
pub mod bzip;
#[cfg(feature = "gzip")]
pub mod gzip;
#[cfg(feature = "lz")]
pub mod lz;
#[cfg(feature = "xz")]
pub mod xz;
pub trait Compression : Default {
fn decoder<'a, R: Read + 'a>(&self, r: R) -> Box<Read + 'a>;
fn encoder<'a, W: Write + 'a>(&self, w: W) -> Box<Write + 'a>;
}
#[derive(Clone, Serialize, Deserialize, PartialEq, Debug)]
#[serde(rename_all = "lowercase")]
#[serde(tag = "type")]
pub enum CompressionType {
Raw(raw::RawCompression),
#[cfg(feature = "bzip")]
Bzip2(bzip::Bzip2Compression),
#[cfg(feature = "gzip")]
Gzip(gzip::GzipCompression),
#[cfg(feature = "lz")]
Lz4(lz::Lz4Compression),
#[cfg(feature = "xz")]
Xz(xz::XzCompression),
}
impl CompressionType {
pub fn new<T: Compression>() -> CompressionType
where CompressionType: std::convert::From<T> {
T::default().into()
}
}
impl Default for CompressionType {
fn default() -> CompressionType {
CompressionType::new::<raw::RawCompression>()
}
}
impl Compression for CompressionType {
fn decoder<'a, R: Read + 'a>(&self, r: R) -> Box<Read + 'a> {
match *self {
CompressionType::Raw(ref c) => c.decoder(r),
#[cfg(feature = "bzip")]
CompressionType::Bzip2(ref c) => c.decoder(r),
#[cfg(feature = "gzip")]
CompressionType::Gzip(ref c) => c.decoder(r),
#[cfg(feature = "xz")]
CompressionType::Xz(ref c) => c.decoder(r),
#[cfg(feature = "lz")]
CompressionType::Lz4(ref c) => c.decoder(r),
}
}
fn encoder<'a, W: Write + 'a>(&self, w: W) -> Box<Write + 'a> {
match *self {
CompressionType::Raw(ref c) => c.encoder(w),
#[cfg(feature = "bzip")]
CompressionType::Bzip2(ref c) => c.encoder(w),
#[cfg(feature = "gzip")]
CompressionType::Gzip(ref c) => c.encoder(w),
#[cfg(feature = "xz")]
CompressionType::Xz(ref c) => c.encoder(w),
#[cfg(feature = "lz")]
CompressionType::Lz4(ref c) => c.encoder(w),
}
}
}
impl std::fmt::Display for CompressionType {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", match *self {
CompressionType::Raw(_) => "Raw",
#[cfg(feature = "bzip")]
CompressionType::Bzip2(_) => "Bzip2",
#[cfg(feature = "gzip")]
CompressionType::Gzip(_) => "Gzip",
#[cfg(feature = "xz")]
CompressionType::Xz(_) => "Xz",
#[cfg(feature = "lz")]
CompressionType::Lz4(_) => "Lz4",
})
}
}
macro_rules! compression_from_impl {
($variant:ident, $c_type:ty) => {
impl std::convert::From<$c_type> for CompressionType {
fn from(c: $c_type) -> Self {
CompressionType::$variant(c)
}
}
}
}
compression_from_impl!(Raw, raw::RawCompression);
#[cfg(feature = "bzip")]
compression_from_impl!(Bzip2, bzip::Bzip2Compression);
#[cfg(feature = "gzip")]
compression_from_impl!(Gzip, gzip::GzipCompression);
#[cfg(feature = "xz")]
compression_from_impl!(Xz, xz::XzCompression);
#[cfg(feature = "lz")]
compression_from_impl!(Lz4, lz::Lz4Compression);