return NeedMoreData when ContentLength and empty chunk

Otherwise, we get stuck in a loop if the buffer is empty

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

@@ -0,0 +1,17 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "uhttp"
+version = "0.1.0"
+dependencies = [
+ "uhttp-ext",
+]
+
+[[package]]
+name = "uhttp-ext"
+version = "0.1.0"
+dependencies = [
+ "uhttp",
+]

src/lib.rs

@@ -168,6 +168,9 @@ impl Connection {
 
 			(_, StateRecv::Body(body_state)) => match body_state {
 				BodyState::ContentLength(remaining) => {
+					if bytes.is_empty() && *remaining != 0 {
+						return fail(ErrorKind::NeedMoreData).tup(bytes);
+					}
 					if bytes.len() < *remaining {
 						Ok((
 							&[] as &[u8],