From ff382aff859188a97426a9e54ceeec858a506384 Mon Sep 17 00:00:00 2001
From: Looly <loolly@aliyun.com>
Date: Tue, 18 Apr 2023 18:21:15 +0800
Subject: [PATCH] fix code

---
 .../hutool/core/io/buffer/FastByteBuffer.java | 19 +++++++++++++++++++
 .../io/stream/FastByteArrayOutputStream.java  | 10 ++++++++++
 .../hutool/core/io/stream/StreamReader.java   |  2 +-
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/io/buffer/FastByteBuffer.java b/hutool-core/src/main/java/org/dromara/hutool/core/io/buffer/FastByteBuffer.java
index 23b89d2a1..ebecfe32d 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/io/buffer/FastByteBuffer.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/io/buffer/FastByteBuffer.java
@@ -12,6 +12,8 @@
 
 package org.dromara.hutool.core.io.buffer;
 
+import org.dromara.hutool.core.io.IORuntimeException;
+
 /**
  * 代码移植自<a href="https://github.com/biezhi/blade">blade</a><br>
  * 快速缓冲，将数据存放在缓冲集中，取代以往的单一数组
@@ -264,6 +266,23 @@ public class FastByteBuffer {
 		return array;
 	}
 
+	/**
+	 * 返回快速缓冲中的数据，如果缓冲区中的数据长度固定，则直接返回原始数组<br>
+	 * 注意此方法共享数组，不能修改数组内容！
+	 *
+	 * @return 快速缓冲中的数据
+	 */
+	public byte[] toArrayZeroCopyIfPossible() {
+		if(1 == currentBufferIndex){
+			final int len = buffers[0].length;
+			if(len == size){
+				return buffers[0];
+			}
+		}
+
+		return toArray();
+	}
+
 	/**
 	 * 返回快速缓冲中的数据
 	 *
diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/FastByteArrayOutputStream.java b/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/FastByteArrayOutputStream.java
index b1e11f340..6280a73f5 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/FastByteArrayOutputStream.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/FastByteArrayOutputStream.java
@@ -120,6 +120,16 @@ public class FastByteArrayOutputStream extends OutputStream {
 		return buffer.toArray();
 	}
 
+	/**
+	 * 转为Byte数组，如果缓冲区中的数据长度固定，则直接返回原始数组<br>
+	 * 注意此方法共享数组，不能修改数组内容！
+	 *
+	 * @return Byte数组
+	 */
+	public byte[] toByteArrayZeroCopyIfPossible() {
+		return buffer.toArrayZeroCopyIfPossible();
+	}
+
 	@Override
 	public String toString() {
 		return toString(CharsetUtil.defaultCharset());
diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/StreamReader.java b/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/StreamReader.java
index 8978ffc72..255fe2d0c 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/StreamReader.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/io/stream/StreamReader.java
@@ -76,7 +76,7 @@ public class StreamReader {
 		}
 
 		//noinspection resource
-		return read(length).toByteArray();
+		return read(length).toByteArrayZeroCopyIfPossible();
 	}
 
 	/**