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fernflower/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java

113 lines
3.1 KiB

// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.jetbrains.java.decompiler.util;
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import java.io.*;
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import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
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public final class InterpreterUtil {
public static final boolean IS_WINDOWS = System.getProperty("os.name", "").startsWith("Windows");
public static final int[] EMPTY_INT_ARRAY = new int[0];
private static final int BUFFER_SIZE = 16 * 1024;
public static void copyFile(File source, File target) throws IOException {
try (FileInputStream in = new FileInputStream(source); FileOutputStream out = new FileOutputStream(target)) {
copyStream(in, out);
}
}
public static void copyStream(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[BUFFER_SIZE];
int len;
while ((len = in.read(buffer)) >= 0) {
out.write(buffer, 0, len);
}
}
public static byte[] getBytes(ZipFile archive, ZipEntry entry) throws IOException {
try (InputStream stream = archive.getInputStream(entry)) {
return readBytes(stream, (int)entry.getSize());
}
}
public static byte[] getBytes(File file) throws IOException {
try (FileInputStream stream = new FileInputStream(file)) {
return readBytes(stream, (int)file.length());
}
}
public static byte[] readBytes(InputStream stream, int length) throws IOException {
byte[] bytes = new byte[length];
int n = 0, off = 0;
while (n < length) {
int count = stream.read(bytes, off + n, length - n);
if (count < 0) {
throw new IOException("premature end of stream");
}
n += count;
}
return bytes;
}
public static void discardBytes(InputStream stream, int length) throws IOException {
if (stream.skip(length) != length) {
throw new IOException("premature end of stream");
}
}
public static boolean equalSets(Collection<?> c1, Collection<?> c2) {
if (c1 == null) {
return c2 == null;
}
else if (c2 == null) {
return false;
}
if (c1.size() != c2.size()) {
return false;
}
HashSet<Object> set = new HashSet<>(c1);
set.removeAll(c2);
return (set.size() == 0);
}
public static boolean equalObjects(Object first, Object second) {
return first == null ? second == null : first.equals(second);
}
public static boolean equalLists(List<?> first, List<?> second) {
if (first == null) {
return second == null;
}
else if (second == null) {
return false;
}
if (first.size() == second.size()) {
for (int i = 0; i < first.size(); i++) {
if (!equalObjects(first.get(i), second.get(i))) {
return false;
}
}
return true;
}
return false;
}
public static String makeUniqueKey(String name, String descriptor) {
return name + ' ' + descriptor;
}
public static String makeUniqueKey(String name, String descriptor1, String descriptor2) {
return name + ' ' + descriptor1 + ' ' + descriptor2;
}
}