8accc52b03
Motivation: The twitter hpack project does not have the support that it used to have. See discussion here: https://github.com/netty/netty/issues/4403. Modifications: Created a new module in Netty and copied the latest from twitter hpack master. Result: Netty no longer depends on twitter hpack.
165 lines
6.1 KiB
Java
165 lines
6.1 KiB
Java
/*
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* Copyright 2015 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.netty.handler.codec.http2.hpack;
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import java.io.IOException;
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/**
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* Extracted from org/apache/commons/codec/binary/Hex.java Copyright Apache Software Foundation
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*/
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final class Hex {
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private Hex() {
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}
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_LOWER =
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{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_UPPER =
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{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
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/**
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* Converts an array of characters representing hexadecimal values into an array of bytes of
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* those same values. The returned array will be half the length of the passed array, as it
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* takes two characters to represent any given byte. An exception is thrown if the passed char
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* array has an odd number of elements.
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*
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* @param data An array of characters containing hexadecimal digits
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* @return A byte array containing binary data decoded from the supplied char array.
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* @throws IOException Thrown if an odd number or illegal of characters is supplied
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*/
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public static byte[] decodeHex(char[] data) throws IOException {
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int len = data.length;
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if ((len & 0x01) != 0) {
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throw new IOException("Odd number of characters.");
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}
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byte[] out = new byte[len >> 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; j < len; i++) {
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int f = toDigit(data[j], j) << 4;
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j++;
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f = f | toDigit(data[j], j);
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j++;
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out[i] = (byte) (f & 0xFF);
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}
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return out;
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of
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* each byte in order. The returned array will be double the length of the passed array, as it
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* takes two characters to represent any given byte.
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*
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* @param data a byte[] to convert to Hex characters
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* @return A char[] containing hexadecimal characters
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*/
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public static char[] encodeHex(byte[] data) {
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return encodeHex(data, true);
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of
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* each byte in order. The returned array will be double the length of the passed array, as it
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* takes two characters to represent any given byte.
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*
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* @param data a byte[] to convert to Hex characters
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* @param toLowerCase <code>true</code> converts to lowercase, <code>false</code> to uppercase
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* @return A char[] containing hexadecimal characters
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* @since 1.4
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*/
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public static char[] encodeHex(byte[] data, boolean toLowerCase) {
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return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of
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* each byte in order. The returned array will be double the length of the passed array, as it
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* takes two characters to represent any given byte.
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*
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* @param data a byte[] to convert to Hex characters
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* @param toDigits the output alphabet
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* @return A char[] containing hexadecimal characters
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* @since 1.4
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*/
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protected static char[] encodeHex(byte[] data, char[] toDigits) {
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int l = data.length;
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char[] out = new char[l << 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; i < l; i++) {
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out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
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out[j++] = toDigits[0x0F & data[i]];
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}
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return out;
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}
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/**
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* Converts an array of bytes into a String representing the hexadecimal values of each byte in
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* order. The returned String will be double the length of the passed array, as it takes two
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* characters to represent any given byte.
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*
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* @param data a byte[] to convert to Hex characters
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* @return A String containing hexadecimal characters
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* @since 1.4
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*/
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public static String encodeHexString(byte[] data) {
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return new String(encodeHex(data));
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}
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/**
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* Converts a hexadecimal character to an integer.
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*
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* @param ch A character to convert to an integer digit
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* @param index The index of the character in the source
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* @return An integer
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* @throws IOException Thrown if ch is an illegal hex character
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*/
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protected static int toDigit(char ch, int index) throws IOException {
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int digit = Character.digit(ch, 16);
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if (digit == -1) {
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throw new IOException("Illegal hexadecimal character " + ch + " at index " + index);
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}
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return digit;
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}
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}
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