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java/org/apache/coyote/http2/ByteUtil.java

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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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
+ *
+ *      http://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 org.apache.coyote.http2;
+
+/**
+ * Utility class for extracting values from byte arrays.
+ */
+public class ByteUtil {
+
+    private ByteUtil() {
+        // Hide default constructor
+    }
+
+
+    public static boolean isBit7Set(byte input) {
+        return (input & 0x80) != 0;
+    }
+
+
+    public static int get31Bits(byte[] input, int firstByte) {
+        return ((input[firstByte] & 0x7F) << 24) + ((input[firstByte + 1] & 0xFF) << 16) +
+                ((input[firstByte + 2] & 0xFF) << 8) + (input[firstByte + 3] & 0xFF);
+    }
+
+
+    public static void set31Bits(byte[] output, int firstByte, int value) {
+        output[firstByte] = (byte) ((value & 0x7F000000) >> 24);
+        output[firstByte + 1] = (byte) ((value & 0xFF0000) >> 16);
+        output[firstByte + 2] = (byte) ((value & 0xFF00) >> 8);
+        output[firstByte + 3] = (byte) (value & 0xFF);
+    }
+
+
+    public static int getOneByte(byte[] input, int pos) {
+        return (input[pos] & 0xFF);
+    }
+
+
+    public static int getTwoBytes(byte[] input, int firstByte) {
+        return ((input[firstByte] & 0xFF) << 8) +  (input[firstByte + 1] & 0xFF);
+    }
+
+
+    public static int getThreeBytes(byte[] input, int firstByte) {
+        return ((input[firstByte] & 0xFF) << 16) + ((input[firstByte + 1] & 0xFF) << 8) +
+                (input[firstByte + 2] & 0xFF);
+    }
+
+
+    public static void setOneBytes(byte[] output, int firstByte, int value) {
+        output[firstByte] = (byte) (value & 0xFF);
+    }
+
+
+    public static void setTwoBytes(byte[] output, int firstByte, int value) {
+        output[firstByte] = (byte) ((value & 0xFF00) >> 8);
+        output[firstByte + 1] = (byte) (value & 0xFF);
+    }
+
+
+    public static void setThreeBytes(byte[] output, int firstByte, int value) {
+        output[firstByte] = (byte) ((value & 0xFF0000) >> 16);
+        output[firstByte + 1] = (byte) ((value & 0xFF00) >> 8);
+        output[firstByte + 2] = (byte) (value & 0xFF);
+    }
+
+
+    public static long getFourBytes(byte[] input, int firstByte) {
+        return ((long)(input[firstByte] & 0xFF) << 24) + ((input[firstByte + 1] & 0xFF) << 16) +
+                ((input[firstByte + 2] & 0xFF) << 8) + (input[firstByte + 3] & 0xFF);
+    }
+
+
+    public static void setFourBytes(byte[] output, int firstByte, long value) {
+        output[firstByte]     = (byte) ((value & 0xFF000000) >> 24);
+        output[firstByte + 1] = (byte) ((value & 0xFF0000) >> 16);
+        output[firstByte + 2] = (byte) ((value & 0xFF00) >> 8);
+        output[firstByte + 3] = (byte) (value & 0xFF);
+    }
+}