org.wildfly.httpclient.ejb.PackedInteger Maven / Gradle / Ivy
Go to download
This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.
*/
package org.wildfly.httpclient.ejb;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* A {@link PackedInteger} is a variable-length integer. The most-significant bit of each byte of a
* {@link PackedInteger} value indicates whether that byte is the final (lowest-order) byte of the value.
* If the bit is 0, then this is the last byte; if the bit is 1, then there is at least one more subsequent
* byte pending, and the current value should be shifted to the left by 7 bits to accommodate the next byte's data.
*
* Note: {@link PackedInteger} cannot hold signed integer values.
*
* @author Carlo de Wolf
*/
class PackedInteger {
/**
* Reads a {@link PackedInteger} value from the passed {@link DataInput input} and returns the
* value of the integer.
*
* @param input The {@link DataInput} from which the {@link PackedInteger} value will be read
* @return
* @throws IOException
* @throws IllegalArgumentException If the passed input is null
*/
public static int readPackedInteger(final DataInput input) throws IOException {
int b = input.readByte();
if ((b & 0x80) == 0x80) {
return readPackedInteger(input) << 7 | (b & 0x7F);
}
return b;
}
/**
* Converts the passed value into a {@link PackedInteger} and writes it to the
* {@link java.io.DataOutput output}
*
* @param output The {@link java.io.DataOutput} to which the {@link PackedInteger} is written to
* @param value The integer value which will be converted to a {@link PackedInteger}
* @throws IOException
* @throws IllegalArgumentException If the passed value is < 0. {@link PackedInteger} doesn't
* allow signed integer
* @throws IllegalArgumentException If the passed output is null
*/
public static void writePackedInteger(final DataOutput output, int value) throws IOException {
if (value < 0)
throw new IllegalArgumentException("Only unsigned integer can be packed");
if (value > 127) {
output.writeByte(value & 0x7F | 0x80);
writePackedInteger(output, value >> 7);
} else {
output.writeByte(value & 0xFF);
}
}
}