1 //! This module contains backend-specific code.
2 
3 use crate::mem::{CompressError, DecompressError, FlushCompress, FlushDecompress, Status};
4 use crate::Compression;
5 
6 /// Traits specifying the interface of the backends.
7 ///
8 /// Sync + Send are added as a condition to ensure they are available
9 /// for the frontend.
10 pub trait Backend: Sync + Send {
total_in(&self) -> u6411     fn total_in(&self) -> u64;
total_out(&self) -> u6412     fn total_out(&self) -> u64;
13 }
14 
15 pub trait InflateBackend: Backend {
make(zlib_header: bool, window_bits: u8) -> Self16     fn make(zlib_header: bool, window_bits: u8) -> Self;
decompress( &mut self, input: &[u8], output: &mut [u8], flush: FlushDecompress, ) -> Result<Status, DecompressError>17     fn decompress(
18         &mut self,
19         input: &[u8],
20         output: &mut [u8],
21         flush: FlushDecompress,
22     ) -> Result<Status, DecompressError>;
reset(&mut self, zlib_header: bool)23     fn reset(&mut self, zlib_header: bool);
24 }
25 
26 pub trait DeflateBackend: Backend {
make(level: Compression, zlib_header: bool, window_bits: u8) -> Self27     fn make(level: Compression, zlib_header: bool, window_bits: u8) -> Self;
compress( &mut self, input: &[u8], output: &mut [u8], flush: FlushCompress, ) -> Result<Status, CompressError>28     fn compress(
29         &mut self,
30         input: &[u8],
31         output: &mut [u8],
32         flush: FlushCompress,
33     ) -> Result<Status, CompressError>;
reset(&mut self)34     fn reset(&mut self);
35 }
36 
37 // Default to Rust implementation unless explicitly opted in to a different backend.
38 cfg_if::cfg_if! {
39     if #[cfg(any(feature = "miniz-sys", feature = "any_zlib"))] {
40         mod c;
41         pub use self::c::*;
42     } else {
43         mod rust;
44         pub use self::rust::*;
45     }
46 }
47