package org.bouncycastle.util.encoders;/** * Converters for going from hex to binary and back. Note: this class assumes ASCII processing. */public class HexTranslator    implements Translator{    private static final byte[]   hexTable =         {             (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',            (byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f'        };    /**     * size of the output block on encoding produced by getDecodedBlockSize()     * bytes.     */    public int getEncodedBlockSize()    {        return 2;    }    public int encode(        byte[]  in,        int     inOff,        int     length,        byte[]  out,        int     outOff)    {        for (int i = 0, j = 0; i < length; i++, j += 2)        {            out[outOff + j] = hexTable[(in[inOff] >> 4) & 0x0f];            out[outOff + j + 1] = hexTable[in[inOff] & 0x0f];            inOff++;        }        return length * 2;    }    /**     * size of the output block on decoding produced by getEncodedBlockSize()     * bytes.     */    public int getDecodedBlockSize()    {        return 1;    }    public int decode(        byte[]  in,        int     inOff,        int     length,        byte[]  out,        int     outOff)    {        int halfLength = length / 2;        byte left, right;        for (int i = 0; i < halfLength; i++)        {            left  = in[inOff + i * 2];            right = in[inOff + i * 2 + 1];                        if (left < (byte)'a')            {                out[outOff] = (byte)((left - '0') << 4);            }            else            {                out[outOff] = (byte)((left - 'a' + 10) << 4);            }            if (right < (byte)'a')            {                out[outOff] += (byte)(right - '0');            }            else            {                out[outOff] += (byte)(right - 'a' + 10);            }            outOff++;        }        return halfLength;    }}