/*
* 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;
import java.nio.ByteBuffer;
/**
* Utility class for extracting values from byte arrays.
*/
class ByteUtil {
private ByteUtil() {
// Hide default constructor
}
static boolean isBit7Set(byte input) {
return (input & 0x80) != 0;
}
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);
}
static int get31Bits(ByteBuffer input, int firstByte) {
return ((input.get(firstByte) & 0x7F) << 24) + ((input.get(firstByte + 1) & 0xFF) << 16) +
((input.get(firstByte + 2) & 0xFF) << 8) + (input.get(firstByte + 3) & 0xFF);
}
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);
}
static int getOneByte(byte[] input, int pos) {
return (input[pos] & 0xFF);
}
static int getOneByte(ByteBuffer input, int pos) {
return (input.get(pos) & 0xFF);
}
static int getTwoBytes(byte[] input, int firstByte) {
return ((input[firstByte] & 0xFF) << 8) + (input[firstByte + 1] & 0xFF);
}
static int getThreeBytes(byte[] input, int firstByte) {
return ((input[firstByte] & 0xFF) << 16) + ((input[firstByte + 1] & 0xFF) << 8) + (input[firstByte + 2] & 0xFF);
}
static int getThreeBytes(ByteBuffer input, int firstByte) {
return ((input.get(firstByte) & 0xFF) << 16) + ((input.get(firstByte + 1) & 0xFF) << 8) +
(input.get(firstByte + 2) & 0xFF);
}
static void setTwoBytes(byte[] output, int firstByte, int value) {
output[firstByte] = (byte) ((value & 0xFF00) >> 8);
output[firstByte + 1] = (byte) (value & 0xFF);
}
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);
}
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);
}
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);
}
}