org.openlca.util.ZipFiles Maven / Gradle / Ivy
package org.openlca.util;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.HashSet;
import java.util.Objects;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
public class ZipFiles {
/**
* Opens the given file as zip file. It tries different character sets to
* decode entry names and comments in case of zip exceptions.
*/
public static ZipFile open(File file) throws IOException {
// default encoding for zip entries is UTF-8
try {
return new ZipFile(file);
} catch (ZipException ignored) {
}
// test the default platform encoding if it is not UTF-8
if (!Objects.equals(Charset.defaultCharset(), StandardCharsets.UTF_8)) {
try {
return new ZipFile(file, Charset.defaultCharset());
} catch (ZipException ignored) {
}
}
// test all other available encodings
var handled = new HashSet();
handled.add(StandardCharsets.UTF_8.name());
handled.add(Charset.defaultCharset().name());
for (var e : Charset.availableCharsets().entrySet()) {
if (handled.contains(e.getKey()))
continue;
try {
return new ZipFile(file, e.getValue());
} catch (ZipException ignored) {
}
handled.add(e.getValue().name());
}
throw new ZipException(
"failed to open archive after testing all possible encodings");
}
}