//! This module contains backend-specific code.

use crate::mem::{CompressError, DecompressError, FlushCompress, FlushDecompress, Status};

use crate::Compression;

/// Traits specifying the interface of the backends.

///

/// Sync + Send are added as a condition to ensure they are available

/// for the frontend.

pub trait Backend: Sync + Send {

    fn total_in(&self) -> u64;

    fn total_out(&self) -> u64;

}

pub trait InflateBackend: Backend {

    fn make(zlib_header: bool, window_bits: u8) -> Self;

    fn decompress(

        &mut self,

        input: &[u8],

        output: &mut [u8],

        flush: FlushDecompress,

    ) -> Result<Status, DecompressError>;

    fn reset(&mut self, zlib_header: bool);

}

pub trait DeflateBackend: Backend {

    fn make(level: Compression, zlib_header: bool, window_bits: u8) -> Self;

    fn compress(

        &mut self,

        input: &[u8],

        output: &mut [u8],

        flush: FlushCompress,

    ) -> Result<Status, CompressError>;

    fn reset(&mut self);

}

// Default to Rust implementation unless explicitly opted in to a different backend.

#[cfg(feature = "any_zlib")]

mod c;

#[cfg(feature = "any_zlib")]

pub use self::c::*;

#[cfg(all(not(feature = "any_zlib"), feature = "miniz_oxide"))]

mod rust;

#[cfg(all(not(feature = "any_zlib"), feature = "miniz_oxide"))]

pub use self::rust::*;

impl std::fmt::Debug for ErrorMessage {

    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {

        self.get().fmt(f)

    }

}