com.github.xpenatan.gdx.backends.teavm.filesystem.HEXCoder Maven / Gradle / Ivy

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Tool to generate libgdx to javascript using teaVM

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package com.github.xpenatan.gdx.backends.teavm.filesystem;

/**
 * Utility class to encode and decode from HEX.
 *
 * @author noblemaster
 */
public class HEXCoder {

    /**
     * HEX chars.
     */
    private static final char[] HEX_CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
    /**
     * HEX lookup.
     */
    private static final int[] HEX_BYTES = new int[128];

    static {
        // init byte lookup
        for(int i = 0; i < HEX_CHARS.length; i++) {
            HEX_BYTES[HEX_CHARS[i]] = i;
            if(HEX_CHARS[i] >= 'A') {
                HEX_BYTES[HEX_CHARS[i] - 'A' + 'a'] = i;  // lowercase also!
            }
        }
    }

    public static byte[] decode(String string) {
        byte[] bytes = new byte[string.length() / 2];
        for(int i = 0; i < bytes.length; i++) {
            char c0 = string.charAt((i * 2));
            char c1 = string.charAt((i * 2) + 1);
            bytes[i] = (byte)((HEX_BYTES[c0] << 4) + (HEX_BYTES[c1]));
        }
        return bytes;
    }

    public static String encode(byte[] bytes) {
        char[] chars = new char[bytes.length * 2];
        for(int i = 0; i < bytes.length; i++) {
            byte b = bytes[i];
            chars[(i * 2)] = HEX_CHARS[(b & 0xFF) >>> 4];
            chars[(i * 2) + 1] = HEX_CHARS[(b & 0x0F)];
        }
        return String.valueOf(chars);
    }
}