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Groovy: A powerful, dynamic language for the JVM

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/*
 * Copyright 2003-2014 the original author or authors.
 *
 * Licensed 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.
 *
 * Derived from Boon all rights granted to Groovy project for this fork.
 */
package groovy.json.internal;

import static groovy.json.internal.Exceptions.die;

/**
 * @author Richard Hightower
 */
public class ByteScanner {

    /**
     * Turns a single nibble into an ascii HEX digit.
     *
     * @param nibble the nibble to serializeObject.
     * @return the encoded nibble (1/2 byte).
     */
    protected static int encodeNibbleToHexAsciiCharByte(final int nibble) {

        switch (nibble) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
            case 0x08:
            case 0x09:
                return nibble + 0x30; // 0x30('0') - 0x39('9')
            case 0x0A:
            case 0x0B:
            case 0x0C:
            case 0x0D:
            case 0x0E:
            case 0x0F:
                return nibble + 0x57; // 0x41('a') - 0x46('f')
            default:
                die("illegal nibble: " + nibble);
                return -1;
        }
    }

    /**
     * Turn a single bytes into two hex character representation.
     *
     * @param decoded the byte to serializeObject.
     * @param encoded the array to which each encoded nibbles are now ascii hex representations.
     */
    public static void encodeByteIntoTwoAsciiCharBytes(final int decoded, final byte[] encoded) {

        encoded[0] = (byte) encodeNibbleToHexAsciiCharByte((decoded >> 4) & 0x0F);
        encoded[1] = (byte) encodeNibbleToHexAsciiCharByte(decoded & 0x0F);
    }

}