impl Write for no_std_io::Write

Author: hanabi1224

codetable/Cargo.toml

@@ -11,7 +11,7 @@ rust-version = "1.81"
 
 [features]
 default = ["std"]
-std = ["blake2b_simd?/std", "blake2s_simd?/std", "blake3?/std", "digest/alloc", "sha1?/alloc", "sha2?/alloc", "sha3?/alloc", "ripemd?/alloc", "multihash-derive/std"]
+std = ["blake2b_simd?/std", "blake2s_simd?/std", "blake3?/std", "digest/alloc", "sha1?/alloc", "sha2?/alloc", "sha3?/alloc", "ripemd?/alloc", "multihash/std", "multihash-derive/std"]
 arb = ["dep:arbitrary", "std"]
 sha1 = ["dep:sha1"]
 sha2 = ["dep:sha2"]
@@ -31,6 +31,7 @@ sha2 = { version = "0.11", default-features = false, optional = true }
 sha3 = { version = "0.11", default-features = false, optional = true }
 strobe-rs = { version = "0.13", default-features = false, optional = true }
 ripemd = { version = "0.2", default-features = false, optional = true }
+multihash = { version = "0.19.4", path = "..", default-features = false }
 multihash-derive = { version = "0.9.2", path = "../derive", default-features = false }
 digest = { version = "0.11", default-features = false }
 serde = { version = "1.0.158", features = ["derive"], default-features = false, optional = true }

codetable/src/hasher_impl.rs

@@ -19,6 +19,16 @@ macro_rules! derive_write {
                 Ok(())
             }
         }
+
+        #[cfg(not(feature = "std"))]
+        impl<const S: usize> multihash::no_std_io::Write for $name<S> {
+            fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+                use multihash_derive::Hasher as _;
+
+                self.update(buf);
+                Ok(buf.len())
+            }
+        }
     };
 }
 
@@ -209,6 +219,16 @@ macro_rules! derive_rustcrypto_hasher {
             }
         }
 
+        #[cfg(not(feature = "std"))]
+        impl multihash::no_std_io::Write for $name {
+            fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+                use multihash_derive::Hasher as _;
+
+                self.update(buf);
+                Ok(buf.len())
+            }
+        }
+
         impl ::digest::Update for $name {
             fn update(&mut self, data: &[u8]) {
                 ::multihash_derive::Hasher::update(self, data)