81 lines
2.4 KiB
Java
81 lines
2.4 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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private static final int BYTE_OVERFLOW = 256;
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private static final int BYTE_MAX = 0xff;
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private static final int BIT_PER_BYTE = 8;
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private static final int ONE_BYTE_OFFSET = 1;
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private final byte[] data;
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public ByteUtils(byte[] data) {
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this.data = data.clone();
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}
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public static int byteToUint(byte b) {
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return (b < 0 ? BYTE_OVERFLOW + b : b);
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}
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public static byte uintToByte(int i) {
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return (byte)(i & BYTE_MAX);
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}
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public final byte[] getBytes() {
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return data.clone();
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}
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public final int getInt16(int offset) {
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return (byteToUint(data[offset]) << BIT_PER_BYTE) | byteToUint(data[offset + 1]);
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}
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public final int getInt16LE(int offset) {
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return (byteToUint(data[offset + ONE_BYTE_OFFSET]) << BIT_PER_BYTE) | byteToUint(data[offset]);
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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 >> BIT_PER_BYTE & BYTE_MAX);
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data[offset + ONE_BYTE_OFFSET] = (byte) (val & BYTE_MAX);
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}
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public final void setInt16LE(int val, int offset) {
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data[offset] = (byte) (val & BYTE_MAX);
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data[offset + ONE_BYTE_OFFSET] = (byte) (val >> BIT_PER_BYTE & BYTE_MAX);
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}
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public final void setInt8(int val, int offset) {
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data[offset] = (byte) (val & BYTE_MAX);
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}
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}
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