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/*
* Copyright (C) 2017-2022 Sebastiano Vigna
*
* 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 it.unimi.dsi.fastutil.io;
import static it.unimi.dsi.fastutil.BigArrays.copy;
import static it.unimi.dsi.fastutil.BigArrays.get;
import static it.unimi.dsi.fastutil.BigArrays.length;
import static it.unimi.dsi.fastutil.BigArrays.wrap;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import org.junit.Test;
import it.unimi.dsi.fastutil.bytes.ByteBigArrays;
import it.unimi.dsi.fastutil.doubles.DoubleIterator;
public class TextIOTest {
static final byte[] SMALL = new byte[1024];
static final byte[] LARGE = new byte[1024 * 1024 + 42];
static {
for(int i = SMALL.length; i-- != 0;) SMALL[i] = (byte)i;
for(int i = LARGE.length; i-- != 0;) LARGE[i] = (byte)i;
}
public void testBytes(final byte[] a) throws IOException {
final File file = File.createTempFile(getClass().getSimpleName(), "dump");
file.deleteOnExit();
final byte[] aShifted = new byte[a.length + 1];
System.arraycopy(a, 0, aShifted, 1, a.length);
for(int i = 0; i < 4; i++) {
file.delete();
switch(i) {
case 0: TextIO.storeBytes(a, file); break;
case 1: TextIO.storeBytes(a, new PrintStream(file)); break;
case 2: TextIO.storeBytes(aShifted, 1, a.length, file); break;
case 3: TextIO.storeBytes(aShifted, 1, a.length, new PrintStream(file)); break;
}
final byte[] b = new byte[a.length];
assertEquals(a.length, TextIO.loadBytes(file, b));
assertArrayEquals(a, b);
TextIO.loadBytes(file, b, 0, a.length);
assertArrayEquals(a, b);
assertEquals(a.length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), b));
assertArrayEquals(a, b);
assertEquals(a.length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), b, 0, a.length));
assertArrayEquals(a, b);
final byte[] c = new byte[a.length + 1];
assertEquals(a.length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), c));
assertEquals(0, c[a.length]);
System.arraycopy(c, 0, b, 0, b.length);
assertArrayEquals(a, b);
assertEquals(a.length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), c, 1, a.length));
assertEquals(0, c[0]);
System.arraycopy(c, 1, b, 0, b.length);
assertArrayEquals(a, b);
}
}
@Test
public void testBytes() throws IOException {
testBytes(SMALL);
testBytes(LARGE);
}
public void testBigBytes(final byte[][] a) throws IOException {
final File file = File.createTempFile(getClass().getSimpleName(), "dump");
file.deleteOnExit();
final long length = length(a);
final byte[][] aShifted = ByteBigArrays.newBigArray(length + 1);
copy(a, 0, aShifted, 1, length);
for(int i = 0; i < 4; i++) {
file.delete();
switch(i) {
case 0: TextIO.storeBytes(a, file); break;
case 1: TextIO.storeBytes(a, new PrintStream(file)); break;
case 2: TextIO.storeBytes(aShifted, 1, length, file); break;
case 3: TextIO.storeBytes(aShifted, 1, length, new PrintStream(file)); break;
}
final byte[][] b = ByteBigArrays.newBigArray(length);
assertEquals(length, TextIO.loadBytes(file, b));
assertArrayEquals(a, b);
assertEquals(length, TextIO.loadBytes(file, b, 0, length));
assertArrayEquals(a, b);
assertEquals(length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), b));
assertArrayEquals(a, b);
assertEquals(length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), b, 0, length));
assertArrayEquals(a, b);
final byte[][] c = ByteBigArrays.newBigArray(length + 1);
assertEquals(length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), c));
assertEquals(0, get(c, length));
copy(c, 0, b, 0, b.length);
assertArrayEquals(a, b);
assertEquals(length, TextIO.loadBytes(new BufferedReader(new FileReader(file)), c, 1, length));
assertEquals(0, get(c, 0));
copy(c, 1, b, 0, b.length);
assertArrayEquals(a, b);
}
}
@Test
public void testBigBytes() throws IOException {
testBigBytes(wrap(SMALL));
testBigBytes(wrap(LARGE));
}
public void testFileDataWrappers() throws IOException {
final File file = File.createTempFile(getClass().getSimpleName(), "dump");
file.deleteOnExit();
final DataOutputStream dos = new DataOutputStream(new FileOutputStream(file));
for(int i = 0; i < 100; i++) dos.writeDouble(i);
dos.close();
DoubleIterator di = TextIO.asDoubleIterator(file);
for(int i = 0; i < 100; i++) assertEquals(i, di.nextDouble(), 0.);
assertFalse(di.hasNext());
di = TextIO.asDoubleIterator(file);
for(int i = 0; i < 100; i++) {
assertTrue(di.hasNext());
assertEquals(i, di.nextDouble(), 0.);
}
di = TextIO.asDoubleIterator(file);
int s = 1;
for(int i = 0; i < 100; i++) {
assertEquals(Math.min(s, 100 - i), di.skip(s));
i += s;
if (i >= 100) break;
assertEquals(i, di.nextDouble(), 0.);
s *= 2;
}
di = TextIO.asDoubleIterator(file);
s = 1;
for(int i = 0; i < 100; i++) {
if (s > 100 - i) break;
assertTrue(di.hasNext());
assertEquals(Math.min(s, 100 - i), di.skip(s));
i += s;
if (i >= 100) {
assertFalse(di.hasNext());
break;
}
assertTrue(di.hasNext());
assertTrue(di.hasNext()); // To increase coverage
assertEquals(i, di.nextDouble(), 0.);
s *= 2;
}
}
}
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