36 lines
1.3 KiB
Java
36 lines
1.3 KiB
Java
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package com.minres.scviewer.ui;
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public final class Hex {
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public static byte[] decode(final String hex) {
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if (hex.length() % 2 != 0) {
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throw new IllegalArgumentException("A hex string must contain an even number of characters: " + hex);
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}
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byte[] out = new byte[hex.length() / 2];
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for (int i = 0; i < hex.length(); i += 2) {
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int high = Character.digit(hex.charAt(i), 16);
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int low = Character.digit(hex.charAt(i + 1), 16);
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if (high == -1 || low == -1) {
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throw new IllegalArgumentException("A hex string can only contain the characters 0-9, A-F, a-f: " + hex);
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}
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out[i / 2] = (byte) (high * 16 + low);
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}
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return out;
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}
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private static final char[] UPPER_HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', };
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public static String encode(final byte[] bytes) {
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StringBuilder stringBuilder = new StringBuilder(bytes.length * 2);
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for (byte cur : bytes) {
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stringBuilder.append(UPPER_HEX_DIGITS[(cur >> 4) & 0xF]);
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stringBuilder.append(UPPER_HEX_DIGITS[(cur & 0xF)]);
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}
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return stringBuilder.toString();
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}
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private Hex() {
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}
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}
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