Polishing contribution

Closes gh-30010

spring-web/src/main/java/org/springframework/http/converter/ByteArrayHttpMessageConverter.java

@@ -51,16 +51,10 @@ public class ByteArrayHttpMessageConverter extends AbstractHttpMessageConverter<
 	}
 
 	@Override
-	public byte[] readInternal(Class<? extends byte[]> clazz, HttpInputMessage inputMessage) throws IOException {
-		long contentLength = inputMessage.getHeaders().getContentLength();
-		final int len;
-		if (contentLength >= 0 && contentLength <= Integer.MAX_VALUE) {
-			len = (int) contentLength;
-		}
-		else {
-			len = Integer.MAX_VALUE;
-		}
-		return inputMessage.getBody().readNBytes(len);
+	public byte[] readInternal(Class<? extends byte[]> clazz, HttpInputMessage message) throws IOException {
+		long length = message.getHeaders().getContentLength();
+		return (length >= 0 && length < Integer.MAX_VALUE ?
+				message.getBody().readNBytes((int) length) : message.getBody().readAllBytes());
 	}
 
 	@Override

spring-web/src/test/java/org/springframework/http/converter/ByteArrayHttpMessageConverterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,11 +32,13 @@ public class ByteArrayHttpMessageConverterTests {
 
 	private ByteArrayHttpMessageConverter converter;
 
+
 	@BeforeEach
 	public void setUp() {
 		converter = new ByteArrayHttpMessageConverter();
 	}
 
+
 	@Test
 	public void canRead() {
 		assertThat(converter.canRead(byte[].class, new MediaType("application", "octet-stream"))).isTrue();
@@ -73,10 +75,8 @@ public class ByteArrayHttpMessageConverterTests {
 		byte[] body = new byte[]{0x1, 0x2};
 		converter.write(body, null, outputMessage);
 		assertThat(outputMessage.getBodyAsBytes()).as("Invalid result").isEqualTo(body);
-		assertThat(outputMessage.getHeaders().getContentType())
-				.as("Invalid content-type").isEqualTo(MediaType.APPLICATION_OCTET_STREAM);
-		assertThat(outputMessage.getHeaders().getContentLength())
-				.as("Invalid content-length").isEqualTo(2);
+		assertThat(outputMessage.getHeaders().getContentType()).isEqualTo(MediaType.APPLICATION_OCTET_STREAM);
+		assertThat(outputMessage.getHeaders().getContentLength()).isEqualTo(2);
 	}
 
 }