140 lines
3.9 KiB
Java
140 lines
3.9 KiB
Java
/*
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* This file is part of artnet4j.
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*
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* Copyright 2009 Karsten Schmidt (PostSpectacular Ltd.)
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*
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* artnet4j is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* artnet4j is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with artnet4j. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.ctdo.bunti.artnet;
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public class ByteUtils {
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protected final byte[] data;
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public final int length;
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public ByteUtils(byte[] data) {
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this.data = data;
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this.length = data.length;
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}
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public static final int byteToUint(byte b) {
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return (b < 0 ? 256 + b : b);
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}
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public static final String hex(int value, int digits) {
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String stuff = Integer.toHexString(value).toUpperCase();
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int length = stuff.length();
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if (length > digits) {
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return stuff.substring(length - digits);
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} else if (length < digits) {
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return "00000000".substring(8 - (digits - length)) + stuff;
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}
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return stuff;
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}
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public boolean compareBytes(byte[] other, int offset, int length) {
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boolean isEqual = (offset + length) < data.length;
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for (int i = 0; i < length && isEqual; i++) {
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isEqual = data[offset++] == other[i];
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}
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return isEqual;
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}
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public final byte[] getByteChunk(byte[] buffer, int offset, int len) {
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if (buffer == null) {
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buffer = new byte[len];
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}
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System.arraycopy(data, offset, buffer, 0, len);
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return buffer;
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}
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public byte[] getBytes() {
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return data;
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}
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/**
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* Gets a 16bit int (Big Endian, MSB first) from the buffer at the given
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* offset.
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*
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* @param offset
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* @return
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*/
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public final int getInt16(int offset) {
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return (byteToUint(data[offset]) << 8) | byteToUint(data[offset + 1]);
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}
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/**
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* Gets a 16bit int (Little Endian, LSB first) from the buffer at the given
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* offset.
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*
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* @param offset
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* @return
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*/
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public final int getInt16LE(int offset) {
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return (byteToUint(data[offset + 1]) << 8) | byteToUint(data[offset]);
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}
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/**
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* Gets an 8bit int from the buffer at the given offset.
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*
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* @param offset
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* @return
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*/
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public final int getInt8(int offset) {
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return byteToUint(data[offset]);
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}
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public final int getLength() {
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return data.length;
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}
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public final void setByteChunk(byte[] buffer, int offset, int len) {
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System.arraycopy(buffer, 0, data, offset, len);
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}
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public final void setInt16(int val, int offset) {
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data[offset] = (byte) (val >> 8 & 0xff);
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data[offset + 1] = (byte) (val & 0xff);
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}
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public final void setInt16LE(int val, int offset) {
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data[offset] = (byte) (val & 0xff);
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data[offset + 1] = (byte) (val >> 8 & 0xff);
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}
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public final void setInt8(int val, int offset) {
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data[offset] = (byte) (val & 0xff);
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}
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public final String toHex(int length) {
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String result = "";
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String ascii = "";
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for (int i = 0; i < length; i++) {
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if (0 == i % 16) {
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result += hex(i, 4) + ": ";
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ascii = " ";
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}
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result += hex(byteToUint(data[i]), 2);
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ascii += data[i] > 0x1f && data[i] < 0x7f ? (char) data[i] : ".";
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if (7 == i % 8) {
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result += " ";
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ascii += " ";
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}
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result += (15 == i % 16 ? ascii + "\n" : " ");
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}
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return result;
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}
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}
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