use std::str::FromStr;
mod error;
#[cfg(feature = "compress")]
use bytes::Bytes;
#[cfg(feature = "compress")]
mod gzip;
#[cfg(feature = "compress")]
mod snappy;
#[cfg(feature = "compress")]
mod lz4;
#[cfg(feature = "compress")]
mod zstd;
pub use error::CompressionError;
use serde::{Serialize, Deserialize};
#[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Hash)]
#[serde(rename_all = "lowercase")]
#[repr(i8)]
#[derive(Default)]
pub enum Compression {
#[default]
None = 0,
Gzip = 1,
Snappy = 2,
Lz4 = 3,
Zstd = 4,
}
impl TryFrom<i8> for Compression {
type Error = CompressionError;
fn try_from(v: i8) -> Result<Self, CompressionError> {
match v {
0 => Ok(Compression::None),
1 => Ok(Compression::Gzip),
2 => Ok(Compression::Snappy),
3 => Ok(Compression::Lz4),
4 => Ok(Compression::Zstd),
_ => Err(CompressionError::UnknownCompressionFormat(format!(
"i8 representation: {v}"
))),
}
}
}
impl FromStr for Compression {
type Err = CompressionError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s.to_lowercase().as_str() {
"none" => Ok(Compression::None),
"gzip" => Ok(Compression::Gzip),
"snappy" => Ok(Compression::Snappy),
"lz4" => Ok(Compression::Lz4),
"zstd" => Ok(Compression::Zstd),
_ => Err(CompressionError::UnknownCompressionFormat(s.into())),
}
}
}
impl std::fmt::Display for Compression {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match *self {
Compression::None => write!(f, "none"),
Compression::Gzip => write!(f, "gzip"),
Compression::Snappy => write!(f, "snappy"),
Compression::Lz4 => write!(f, "lz4"),
Compression::Zstd => write!(f, "zstd"),
}
}
}
#[cfg(feature = "compress")]
impl Compression {
pub fn compress(&self, src: &[u8]) -> Result<Bytes, CompressionError> {
match *self {
Compression::None => Ok(Bytes::copy_from_slice(src)),
Compression::Gzip => gzip::compress(src),
Compression::Snappy => snappy::compress(src),
Compression::Lz4 => lz4::compress(src),
Compression::Zstd => zstd::compress(src),
}
}
pub fn uncompress(&self, src: &[u8]) -> Result<Option<Vec<u8>>, CompressionError> {
match *self {
Compression::None => Ok(None),
Compression::Gzip => {
let output = gzip::uncompress(src)?;
Ok(Some(output))
}
Compression::Snappy => {
let output = snappy::uncompress(src)?;
Ok(Some(output))
}
Compression::Lz4 => {
let output = lz4::uncompress(src)?;
Ok(Some(output))
}
Compression::Zstd => {
let output = zstd::uncompress(src)?;
Ok(Some(output))
}
}
}
}