vendor/flate2/src/ffi/mod.rs

   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 {
  11     fn total_in(&self) -> u64;
  12     fn total_out(&self) -> u64;
  13 }
  14
  15 pub trait InflateBackend: Backend {
  16     fn make(zlib_header: bool, window_bits: u8) -> Self;
  17     fn decompress(
  18         &mut self,
  19         input: &[u8],
  20         output: &mut [u8],
  21         flush: FlushDecompress,
  22     ) -> Result<Status, DecompressError>;
  23     fn reset(&mut self, zlib_header: bool);
  24 }
  25
  26 pub trait DeflateBackend: Backend {
  27     fn make(level: Compression, zlib_header: bool, window_bits: u8) -> Self;
  28     fn compress(
  29         &mut self,
  30         input: &[u8],
  31         output: &mut [u8],
  32         flush: FlushCompress,
  33     ) -> Result<Status, CompressError>;
  34     fn reset(&mut self);
  35 }
  36
  37 // Default to Rust implementation unless explicitly opted in to a different backend.
  38 #[cfg(feature = "any_zlib")]
  39 mod c;
  40 #[cfg(feature = "any_zlib")]
  41 pub use self::c::*;
  42
  43 #[cfg(not(feature = "any_zlib"))]
  44 mod rust;
  45 #[cfg(not(feature = "any_zlib"))]
  46 pub use self::rust::*;
  47
  48 impl std::fmt::Debug for ErrorMessage {
  49     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
  50         self.get().fmt(f)
  51     }
  52 }