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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 com.android.server.wifi;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import androidx.test.filters.SmallTest;
import org.junit.Test;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
/**
* Unit tests for {@link com.android.server.wifi.ByteBufferReader}.
*/
@SmallTest
public class ByteBufferReaderTest {
/**
* Verify that BufferUnderflowException will be thrown when reading an integer from a buffer
* that contained less data than needed.
*
* @throws Exception
*/
@Test(expected = BufferUnderflowException.class)
public void readIntegerWithBufferUnderflow() throws Exception {
byte[] data = new byte[1];
ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
ByteBufferReader.readInteger(buffer, buffer.order(), 2);
}
/**
* Verify that IllegalArgumentException will be thrown when reading an integer that exceeds
* the maximum integer size.
*
* @throws Exception
*/
@Test(expected = IllegalArgumentException.class)
public void readIntegerExceedingMaximumLength() throws Exception {
int length = ByteBufferReader.MAXIMUM_INTEGER_SIZE + 1;
byte[] data = new byte[length];
ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
ByteBufferReader.readInteger(buffer, buffer.order(), length);
}
/**
* Verify that IllegalArgumentException will be thrown when reading an integer with size
* less than the minimum.
*
* @throws Exception
*/
@Test(expected = IllegalArgumentException.class)
public void readIntegerLessThanMinimumLength() throws Exception {
int length = ByteBufferReader.MINIMUM_INTEGER_SIZE - 1;
byte[] data = new byte[length];
ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
ByteBufferReader.readInteger(buffer, buffer.order(), length);
}
/**
* Verify that the expected integer value is returned when reading an integer with minimum
* integer size.
*
* @throws Exception
*/
@Test
public void readIntegerWithMinimumSize() throws Exception {
byte[] data = new byte[] {0x1};
ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
assertEquals(1, ByteBufferReader.readInteger(buffer, buffer.order(),
ByteBufferReader.MINIMUM_INTEGER_SIZE));
}
/**
* Verify that the expected integer value is returned when reading an integer with maximum
* integer size.
*
* @throws Exception
*/
@Test
public void readIntegerWithMaximumSize() throws Exception {
byte[] data = new byte[] {0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11};
// Little Endian parsing.
ByteBuffer leBuffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
long leValue = 0x110000000000001fL;
assertEquals(leValue, ByteBufferReader.readInteger(leBuffer, leBuffer.order(),
ByteBufferReader.MAXIMUM_INTEGER_SIZE));
// Big Endian parsing.
ByteBuffer beBuffer = ByteBuffer.wrap(data).order(ByteOrder.BIG_ENDIAN);
long beValue = 0x1f00000000000011L;
assertEquals(beValue, ByteBufferReader.readInteger(beBuffer, beBuffer.order(),
ByteBufferReader.MAXIMUM_INTEGER_SIZE));
}
/**
* Verify that NegativeArraySizeException will be thrown when attempting to read a string with
* negative size.
*
* @throws Exception
*/
@Test(expected = NegativeArraySizeException.class)
public void readStringWithNegativeSize() throws Exception {
ByteBufferReader.readString(ByteBuffer.wrap(new byte[10]), -1, StandardCharsets.US_ASCII);
}
/**
* Verify that an empty String will be returned when reading a string with zero size.
*
* @throws Exception
*/
@Test
public void readStringWithZeroSize() throws Exception {
String str = ByteBufferReader.readString(
ByteBuffer.wrap(new byte[10]), 0, StandardCharsets.US_ASCII);
assertTrue(str.isEmpty());
}
/**
* Verify that the expected string value is returned when reading a string from a buffer that
* contained a valid string.
*
* @throws Exception
*/
@Test
public void readString() throws Exception {
String expectedValue = "Hello World";
ByteBuffer buffer = ByteBuffer.wrap(expectedValue.getBytes(StandardCharsets.US_ASCII));
String actualValue = ByteBufferReader.readString(
buffer, buffer.remaining(), StandardCharsets.US_ASCII);
assertEquals(expectedValue, actualValue);
}
/**
* Verify that the expected string value is returned when reading a buffer that contained the
* size of the string and the string value.
*
* @throws Exception
*/
@Test
public void readStringWithByteLength() throws Exception {
String expectedValue = "Hello World";
ByteBuffer buffer = ByteBuffer.allocate(expectedValue.length() + 1);
buffer.put((byte) expectedValue.length());
buffer.put(expectedValue.getBytes(StandardCharsets.US_ASCII));
// Rewind the buffer's position to the beginning for reading.
buffer.position(0);
String actualValue =
ByteBufferReader.readStringWithByteLength(buffer, StandardCharsets.US_ASCII);
assertEquals(expectedValue, actualValue);
}
}
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