Here you can find the source of fromAscii(byte[] ascii)
Parameter | Description |
---|---|
ascii | each byte represents an ascii '0' or '1' |
public static byte[] fromAscii(byte[] ascii)
/*/*w w w . ja va 2 s . c o m*/ * Copyright 2001-2004 The Apache Software Foundation. * * 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. */ import org.apache.commons.codec.BinaryDecoder; import org.apache.commons.codec.BinaryEncoder; import org.apache.commons.codec.DecoderException; import org.apache.commons.codec.EncoderException; public class Main{ /** Empty byte array. */ private static final byte[] EMPTY_BYTE_ARRAY = new byte[0]; private static final int[] BITS = { BIT_0, BIT_1, BIT_2, BIT_3, BIT_4, BIT_5, BIT_6, BIT_7 }; /** * Decodes a byte array where each char represents an ascii '0' or '1'. * * @param ascii * each char represents an ascii '0' or '1' * @return the raw encoded binary where each bit corresponds to a char in the char array argument */ public static byte[] fromAscii(char[] ascii) { if (ascii == null || ascii.length == 0) { return EMPTY_BYTE_ARRAY; } // get length/8 times bytes with 3 bit shifts to the right of the length byte[] l_raw = new byte[ascii.length >> 3]; /* * We decr index jj by 8 as we go along to not recompute indices using multiplication every time inside the * loop. */ for (int ii = 0, jj = ascii.length - 1; ii < l_raw.length; ii++, jj -= 8) { for (int bits = 0; bits < BITS.length; ++bits) { if (ascii[jj - bits] == '1') { l_raw[ii] |= BITS[bits]; } } } return l_raw; } /** * Decodes a byte array where each byte represents an ascii '0' or '1'. * * @param ascii * each byte represents an ascii '0' or '1' * @return the raw encoded binary where each bit corresponds to a byte in the byte array argument */ public static byte[] fromAscii(byte[] ascii) { if (ascii == null || ascii.length == 0) { return EMPTY_BYTE_ARRAY; } // get length/8 times bytes with 3 bit shifts to the right of the length byte[] l_raw = new byte[ascii.length >> 3]; /* * We decr index jj by 8 as we go along to not recompute indices using multiplication every time inside the * loop. */ for (int ii = 0, jj = ascii.length - 1; ii < l_raw.length; ii++, jj -= 8) { for (int bits = 0; bits < BITS.length; ++bits) { if (ascii[jj - bits] == '1') { l_raw[ii] |= BITS[bits]; } } } return l_raw; } }