feat(zstd): support reading uncompressed size

Author: FineFindus

crates/compression-codecs/src/zstd/decoder.rs

@@ -1,5 +1,5 @@
 use crate::zstd::params::DParameter;
-use crate::Decode;
+use crate::{Decode, DecodedSize};
 use compression_core::unshared::Unshared;
 use compression_core::util::PartialBuffer;
 use libzstd::stream::raw::{Decoder, Operation};
@@ -84,3 +84,10 @@ impl Decode for ZstdDecoder {
         Ok(bytes_left == 0)
     }
 }
+
+impl DecodedSize for ZstdDecoder {
+    fn decoded_size(input: &[u8]) -> Result<usize> {
+        zstd_safe::find_frame_compressed_size(input)
+            .map_err(|_err| io::Error::from(io::ErrorKind::Other))
+    }
+}