/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.io;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.OutputStream;
/**
* Helper to read and write unsigned numerics
*
* @author Manik Surtani
* @since 4.0
*/
public class UnsignedNumeric {
/**
* Reads an int stored in variable-length format. Reads between one and five bytes. Smaller values take fewer
* bytes. Negative numbers are not supported.
*/
public static int readUnsignedInt(ObjectInput in) throws IOException {
byte b = in.readByte();
int i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.readByte();
i |= (b & 0x7FL) << shift;
}
return i;
}
public static int readUnsignedInt(InputStream in) throws IOException {
int b = in.read();
int i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.read();
i |= (b & 0x7FL) << shift;
}
return i;
}
public static int readUnsignedInt(java.nio.ByteBuffer in) {
int b = in.get();
int i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.get();
i |= (b & 0x7FL) << shift;
}
return i;
}
/**
* Writes an int in a variable-length format. Writes between one and five bytes. Smaller values take fewer bytes.
* Negative numbers are not supported.
*
* @param i int to write
*/
public static void writeUnsignedInt(ObjectOutput out, int i) throws IOException {
while ((i & ~0x7F) != 0) {
out.writeByte((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.writeByte((byte) i);
}
public static void writeUnsignedInt(OutputStream out, int i) throws IOException {
while ((i & ~0x7F) != 0) {
out.write((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.write((byte) i);
}
public static void writeUnsignedInt(java.nio.ByteBuffer out, int i) {
while ((i & ~0x7F) != 0) {
out.put((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.put((byte) i);
}
/**
* Reads an int stored in variable-length format. Reads between one and nine bytes. Smaller values take fewer
* bytes. Negative numbers are not supported.
*/
public static long readUnsignedLong(ObjectInput in) throws IOException {
byte b = in.readByte();
long i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.readByte();
i |= (b & 0x7FL) << shift;
}
return i;
}
public static long readUnsignedLong(InputStream in) throws IOException {
int b = in.read();
long i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.read();
i |= (b & 0x7FL) << shift;
}
return i;
}
public static long readUnsignedLong(java.nio.ByteBuffer in) {
int b = in.get();
long i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = in.get();
i |= (b & 0x7FL) << shift;
}
return i;
}
/**
* Writes an int in a variable-length format. Writes between one and nine bytes. Smaller values take fewer bytes.
* Negative numbers are not supported.
*
* @param i int to write
*/
public static void writeUnsignedLong(ObjectOutput out, long i) throws IOException {
while ((i & ~0x7F) != 0) {
out.writeByte((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.writeByte((byte) i);
}
public static void writeUnsignedLong(OutputStream out, long i) throws IOException {
while ((i & ~0x7F) != 0) {
out.write((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.write((byte) i);
}
public static void writeUnsignedLong(java.nio.ByteBuffer out, long i) {
while ((i & ~0x7F) != 0) {
out.put((byte) ((i & 0x7f) | 0x80));
i >>>= 7;
}
out.put((byte) i);
}
/**
* Reads an int stored in variable-length format. Reads between one and five bytes. Smaller values take fewer
* bytes. Negative numbers are not supported.
*/
public static int readUnsignedInt(byte[] bytes, int offset) {
byte b = bytes[offset++];
int i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = bytes[offset++];
i |= (b & 0x7FL) << shift;
}
return i;
}
/**
* Writes an int in a variable-length format. Writes between one and five bytes. Smaller values take fewer bytes.
* Negative numbers are not supported.
*
* @param i int to write
*/
public static void writeUnsignedInt(byte[] bytes, int offset, int i) {
while ((i & ~0x7F) != 0) {
bytes[offset++] = (byte) ((i & 0x7f) | 0x80);
i >>>= 7;
}
bytes[offset] = (byte) i;
}
/**
* Reads an int stored in variable-length format. Reads between one and nine bytes. Smaller values take fewer
* bytes. Negative numbers are not supported.
*/
public static long readUnsignedLong(byte[] bytes, int offset) {
byte b = bytes[offset++];
long i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = bytes[offset++];
i |= (b & 0x7FL) << shift;
}
return i;
}
/**
* Writes an int in a variable-length format. Writes between one and nine bytes. Smaller values take fewer bytes.
* Negative numbers are not supported.
*
* @param i int to write
*/
public static void writeUnsignedLong(byte[] bytes, int offset, long i) {
while ((i & ~0x7F) != 0) {
bytes[offset++] = (byte) ((i & 0x7f) | 0x80);
i >>>= 7;
}
bytes[offset] = (byte) i;
}
}