Implement Clone for CompressError and DecompressError

Author: mkrasnitski

src/ffi/c.rs

@@ -8,7 +8,7 @@ use std::ptr;
 use super::*;
 use crate::mem;
 
-#[derive(Default)]
+#[derive(Clone, Default)]
 pub struct ErrorMessage(Option<&'static str>);
 
 impl ErrorMessage {

src/ffi/rust.rs

@@ -17,7 +17,7 @@ use super::*;
 use crate::mem;
 
 // miniz_oxide doesn't provide any error messages (yet?)
-#[derive(Default)]
+#[derive(Clone, Default)]
 pub struct ErrorMessage;
 
 impl ErrorMessage {

src/mem.rs

@@ -109,15 +109,15 @@ pub enum FlushDecompress {
 }
 
 /// The inner state for an error when decompressing
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub(crate) enum DecompressErrorInner {
     General { msg: ErrorMessage },
     NeedsDictionary(u32),
 }
 
 /// Error returned when a decompression object finds that the input stream of
 /// bytes was not a valid input stream of bytes.
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct DecompressError(pub(crate) DecompressErrorInner);
 
 impl DecompressError {
@@ -147,7 +147,7 @@ pub(crate) fn decompress_need_dict<T>(adler: u32) -> Result<T, DecompressError>
 
 /// Error returned when a compression object is used incorrectly or otherwise
 /// generates an error.
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct CompressError {
     pub(crate) msg: ErrorMessage,
 }