/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
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);
}
}