Mega Code Archive
Manages fixed-length byte arrays
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/*
* dbXML - Native XML Database
* Copyright (C) 1999-2004 The dbXML Group, L.L.C.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id: ByteArray.java,v 1.3 2004/07/20 20:19:42 bradford Exp $
*/
/**
* ByteArray manages fixed-length byte arrays
*/
public final class ByteArray {
private byte[] data;
private int offset;
private int length;
private int pos;
private ByteArray() {
}
public ByteArray(int size) {
data = new byte[size];
offset = 0;
length = size;
pos = 0;
}
public ByteArray(byte[] data, int offset, int length) {
this.data = data;
this.offset = offset;
this.length = length;
this.pos = 0;
}
public ByteArray(byte[] data) {
this.data = data;
offset = 0;
length = data.length;
pos = 0;
}
public byte[] getData() {
return data;
}
public int getLength() {
return length;
}
public int getOffset() {
return offset;
}
public int getPos() {
return pos;
}
public void setPos(int pos) {
if ( pos >= 0 && pos < length )
this.pos = pos;
}
public void resetPos() {
pos = offset;
}
public static long readLong(byte[] data, int offset) {
int ch1 = data[offset] & 0xff;
int ch2 = data[offset + 1] & 0xff;
int ch3 = data[offset + 2] & 0xff;
int ch4 = data[offset + 3] & 0xff;
int ch5 = data[offset + 4] & 0xff;
int ch6 = data[offset + 5] & 0xff;
int ch7 = data[offset + 6] & 0xff;
int ch8 = data[offset + 7] & 0xff;
return (ch1 << 56) + (ch2 << 48) + (ch3 << 40) + (ch4 << 32)
+ (ch5 << 24) + (ch6 << 16) + (ch7 << 8) + (ch8 << 0);
}
public long readLong() {
long result = readLong(data, pos);
pos += 8;
return result;
}
public static int readInt(byte[] data, int offset) {
int ch1 = data[offset] & 0xff;
int ch2 = data[offset + 1] & 0xff;
int ch3 = data[offset + 2] & 0xff;
int ch4 = data[offset + 3] & 0xff;
return (ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0);
}
public int readInt() {
int result = readInt(data, pos);
pos += 4;
return result;
}
public static short readShort(byte[] data, int offset) {
int ch1 = data[offset] & 0xff;
int ch2 = data[offset + 1] & 0xff;
return (short)((ch1 << 8) + (ch2 << 0));
}
public short readShort() {
short result = readShort(data, pos);
pos += 2;
return result;
}
public static char readChar(byte[] data, int offset) {
int ch1 = data[offset] & 0xff;
int ch2 = data[offset + 1] & 0xff;
return (char)((ch1 << 8) + (ch2 << 0));
}
public char readChar() {
char result = readChar(data, pos);
pos += 2;
return result;
}
public static byte readByte(byte[] data, int offset) {
return data[offset];
}
public byte readByte() {
return data[pos++];
}
public static void readBytes(byte[] data, int offset, byte[] buffer, int pos, int length) {
System.arraycopy(data, offset, buffer, pos, length);
}
public ByteArray readBytes(byte[] buffer, int offset, int length) {
System.arraycopy(data, pos, buffer, offset, length);
pos += length;
return this;
}
public static void readBytes(byte[] data, int offset, byte[] buffer) {
readBytes(data, offset, buffer, 0, buffer.length);
}
public ByteArray readBytes(byte[] buffer) {
return readBytes(buffer, 0, buffer.length);
}
public static void writeLong(byte[] data, int offset, long value) {
data[offset] = (byte)((value >>> 56) & 0xFF);
data[offset + 1] = (byte)((value >>> 48) & 0xFF);
data[offset + 2] = (byte)((value >>> 40) & 0xFF);
data[offset + 3] = (byte)((value >>> 32) & 0xFF);
data[offset + 4] = (byte)((value >>> 24) & 0xFF);
data[offset + 5] = (byte)((value >>> 16) & 0xFF);
data[offset + 6] = (byte)((value >>> 8) & 0xFF);
data[offset + 7] = (byte)((value >>> 0) & 0xFF);
}
public ByteArray writeLong(long value) {
writeLong(data, pos, value);
pos += 8;
return this;
}
public static void writeInt(byte[] data, int offset, int value) {
data[offset] = (byte)((value >>> 24) & 0xFF);
data[offset + 1] = (byte)((value >>> 16) & 0xFF);
data[offset + 2] = (byte)((value >>> 8) & 0xFF);
data[offset + 3] = (byte)((value >>> 0) & 0xFF);
}
public ByteArray writeInt(int value) {
writeInt(data, pos, value);
pos += 4;
return this;
}
public static void writeShort(byte[] data, int offset, short value) {
data[offset] = (byte)((value >>> 8) & 0xFF);
data[offset + 1] = (byte)((value >>> 0) & 0xFF);
}
public ByteArray writeShort(short value) {
writeShort(data, pos, value);
pos += 2;
return this;
}
public static void writeChar(byte[] data, int offset, char value) {
data[offset] = (byte)((value >>> 8) & 0xFF);
data[offset + 1] = (byte)((value >>> 0) & 0xFF);
}
public ByteArray writeChar(char value) {
writeChar(data, pos, value);
pos += 2;
return this;
}
public static void writeByte(byte[] data, int offset, byte value) {
data[offset] = value;
}
public ByteArray writeByte(byte value) {
data[pos++] = value;
return this;
}
public static void writeBytes(byte[] data, int offset, byte[] buffer, int pos, int length) {
System.arraycopy(buffer, pos, data, offset, length);
}
public ByteArray writeBytes(byte[] buffer, int offset, int length) {
System.arraycopy(buffer, pos, data, offset, length);
pos += length;
return this;
}
public static void writeBytes(byte[] data, int offset, byte[] buffer) {
writeBytes(data, offset, buffer, 0, buffer.length);
}
public ByteArray writeBytes(byte[] buffer) {
return writeBytes(buffer, 0, buffer.length);
}
}
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