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/*
* Copyright (C) 2021, Thomas Wolf <thomas.wolf@paranor.ch> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.util;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import org.junit.Test;
public class IOTest {
private static final byte[] DATA = "abcdefghijklmnopqrstuvwxyz"
.getBytes(StandardCharsets.US_ASCII);
private byte[] initBuffer(int size) {
byte[] buffer = new byte[size];
for (int i = 0; i < size; i++) {
buffer[i] = (byte) ('0' + (i % 10));
}
return buffer;
}
private int read(byte[] buffer, int from) throws IOException {
try (InputStream in = new ByteArrayInputStream(DATA)) {
return IO.readFully(in, buffer, from);
}
}
@Test
public void readFullyBufferShorter() throws Exception {
byte[] buffer = initBuffer(9);
int length = read(buffer, 0);
assertEquals(buffer.length, length);
assertArrayEquals(buffer, Arrays.copyOfRange(DATA, 0, length));
}
@Test
public void readFullyBufferLonger() throws Exception {
byte[] buffer = initBuffer(50);
byte[] initial = Arrays.copyOf(buffer, buffer.length);
int length = read(buffer, 0);
assertEquals(DATA.length, length);
assertArrayEquals(Arrays.copyOfRange(buffer, 0, length), DATA);
assertArrayEquals(Arrays.copyOfRange(buffer, length, buffer.length),
Arrays.copyOfRange(initial, length, initial.length));
}
@Test
public void readFullyBufferShorterOffset() throws Exception {
byte[] buffer = initBuffer(9);
byte[] initial = Arrays.copyOf(buffer, buffer.length);
int length = read(buffer, 6);
assertEquals(3, length);
assertArrayEquals(Arrays.copyOfRange(buffer, 0, 6),
Arrays.copyOfRange(initial, 0, 6));
assertArrayEquals(Arrays.copyOfRange(buffer, 6, buffer.length),
Arrays.copyOfRange(DATA, 0, 3));
}
@Test
public void readFullyBufferLongerOffset() throws Exception {
byte[] buffer = initBuffer(50);
byte[] initial = Arrays.copyOf(buffer, buffer.length);
int length = read(buffer, 40);
assertEquals(10, length);
assertArrayEquals(Arrays.copyOfRange(buffer, 0, 40),
Arrays.copyOfRange(initial, 0, 40));
assertArrayEquals(Arrays.copyOfRange(buffer, 40, buffer.length),
Arrays.copyOfRange(DATA, 0, 10));
}
}
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