f - Avoid extra allocation when reading chunked-encoded data

Author: jkczyz

lightning-block-sync/src/http.rs

@@ -303,9 +303,10 @@ impl HttpClient {
 								None => break,
 								Some(chunk_size) => chunk_size,
 							};
-							let mut chunk_body = vec![0; chunk_size + "\r\n".len()];
-							reader.read_exact(&mut chunk_body[..]).await?;
-							content.extend_from_slice(&chunk_body[..chunk_size]);
+							let chunk_offset = content.len();
+							content.resize(chunk_offset + chunk_size + "\r\n".len(), 0);
+							reader.read_exact(&mut content[chunk_offset..]).await?;
+							content.resize(chunk_offset + chunk_size, 0);
 						}
 						Ok(content)
 					}