新增 ByteArrayTools

src/main/java/xyz/zhouxy/plusone/commons/util/ByteArrayTools.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package xyz.zhouxy.plusone.commons.util;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * ByteArrayTools
+ *
+ * <p>byte 数组工具类
+ *
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ */
+@Beta
+public class ByteArrayTools {
+
+    public static byte[] longToByteArray(long value) {
+        final byte[] bytes = new byte[8];
+        fillToByteArrayInternal(value, bytes, 0);
+        return bytes;
+    }
+
+    public static void fillToByteArray(long value, final byte[] bytes) {
+        AssertTools.checkArgument(bytes != null && bytes.length >= 8);
+        fillToByteArrayInternal(value, bytes, 0);
+    }
+
+    public static void fillToByteArray(long value, final byte[] bytes, int startIndex) {
+        AssertTools.checkArgument(bytes != null && bytes.length >= startIndex + 8);
+        fillToByteArrayInternal(value, bytes, startIndex);
+    }
+
+    private static void fillToByteArrayInternal(long value, final byte[] bytes, int startIndex) {
+        for (int i = 0; i < 8; i++) {
+            int offset = 8 * (7 - i);
+            bytes[startIndex + i] = (byte) ((value & (0xFFL << offset)) >> offset);
+        }
+    }
+
+    private ByteArrayTools() {
+        throw new IllegalStateException("Utility class");
+    }
+}