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compressors.rs
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compressors.rs
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use std::io;
use serde::{Deserialize, Serialize};
pub trait StoreCompressor {
fn compress(&self, uncompressed: &[u8], compressed: &mut Vec<u8>) -> io::Result<()>;
fn decompress(&self, compressed: &[u8], decompressed: &mut Vec<u8>) -> io::Result<()>;
fn get_compressor_id() -> u8;
}
/// Compressor can be used on `IndexSettings` to choose
/// the compressor used to compress the doc store.
///
/// The default is Lz4Block, but also depends on the enabled feature flags.
#[derive(Clone, Debug, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum Compressor {
#[serde(rename = "none")]
/// No compression
None,
#[serde(rename = "lz4")]
/// Use the lz4 compressor (block format)
Lz4,
#[serde(rename = "brotli")]
/// Use the brotli compressor
Brotli,
#[serde(rename = "snappy")]
/// Use the snap compressor
Snappy,
#[serde(rename = "zstd")]
/// Use the zstd compressor
Zstd,
}
impl Default for Compressor {
fn default() -> Self {
if cfg!(feature = "lz4-compression") {
Compressor::Lz4
} else if cfg!(feature = "brotli-compression") {
Compressor::Brotli
} else if cfg!(feature = "snappy-compression") {
Compressor::Snappy
} else if cfg!(feature = "zstd-compression") {
Compressor::Zstd
} else {
Compressor::None
}
}
}
impl Compressor {
pub(crate) fn from_id(id: u8) -> Compressor {
match id {
0 => Compressor::None,
1 => Compressor::Lz4,
2 => Compressor::Brotli,
3 => Compressor::Snappy,
4 => Compressor::Zstd,
_ => panic!("unknown compressor id {:?}", id),
}
}
pub(crate) fn get_id(&self) -> u8 {
match self {
Self::None => 0,
Self::Lz4 => 1,
Self::Brotli => 2,
Self::Snappy => 3,
Self::Zstd => 4,
}
}
#[inline]
pub(crate) fn compress(&self, uncompressed: &[u8], compressed: &mut Vec<u8>) -> io::Result<()> {
match self {
Self::None => {
compressed.clear();
compressed.extend_from_slice(uncompressed);
Ok(())
}
Self::Lz4 => {
#[cfg(feature = "lz4-compression")]
{
super::compression_lz4_block::compress(uncompressed, compressed)
}
#[cfg(not(feature = "lz4-compression"))]
{
panic!("lz4-compression feature flag not activated");
}
}
Self::Brotli => {
#[cfg(feature = "brotli-compression")]
{
super::compression_brotli::compress(uncompressed, compressed)
}
#[cfg(not(feature = "brotli-compression"))]
{
panic!("brotli-compression-compression feature flag not activated");
}
}
Self::Snappy => {
#[cfg(feature = "snappy-compression")]
{
super::compression_snap::compress(uncompressed, compressed)
}
#[cfg(not(feature = "snappy-compression"))]
{
panic!("snappy-compression feature flag not activated");
}
}
Self::Zstd => {
#[cfg(feature = "zstd-compression")]
{
super::compression_zstd_block::compress(uncompressed, compressed)
}
#[cfg(not(feature = "zstd-compression"))]
{
panic!("zstd-compression feature flag not activated");
}
}
}
}
#[inline]
pub(crate) fn decompress(
&self,
compressed: &[u8],
decompressed: &mut Vec<u8>,
) -> io::Result<()> {
match self {
Self::None => {
decompressed.clear();
decompressed.extend_from_slice(compressed);
Ok(())
}
Self::Lz4 => {
#[cfg(feature = "lz4-compression")]
{
super::compression_lz4_block::decompress(compressed, decompressed)
}
#[cfg(not(feature = "lz4-compression"))]
{
panic!("lz4-compression feature flag not activated");
}
}
Self::Brotli => {
#[cfg(feature = "brotli-compression")]
{
super::compression_brotli::decompress(compressed, decompressed)
}
#[cfg(not(feature = "brotli-compression"))]
{
panic!("brotli-compression feature flag not activated");
}
}
Self::Snappy => {
#[cfg(feature = "snappy-compression")]
{
super::compression_snap::decompress(compressed, decompressed)
}
#[cfg(not(feature = "snappy-compression"))]
{
panic!("snappy-compression feature flag not activated");
}
}
Self::Zstd => {
#[cfg(feature = "zstd-compression")]
{
super::compression_zstd_block::decompress(compressed, decompressed)
}
#[cfg(not(feature = "zstd-compression"))]
{
panic!("zstd-compression feature flag not activated");
}
}
}
}
}