com.zving.preloader.zip.FallbackZipEncoding Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.zving.preloader.zip;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* A fallback ZipEncoding, which uses a java.io means to encode names.
*
* This implementation is not favorable for encodings other than
* utf-8, because java.io encodes unmappable character as question
* marks leading to unreadable ZIP entries on some operating
* systems.
*
* Furthermore this implementation is unable to tell, whether a
* given name can be safely encoded or not.
*
* This implementation acts as a last resort implementation, when
* neither {@link Simple8BitZipEnoding} nor {@link NioZipEncoding} is
* available.
*
* The methods of this class are reentrant.
*/
class FallbackZipEncoding implements ZipEncoding {
private final String charset;
/**
* Construct a fallback zip encoding, which uses the platform's
* default charset.
*/
public FallbackZipEncoding() {
this.charset = null;
}
/**
* Construct a fallback zip encoding, which uses the given charset.
*
* @param charset The name of the charset or null for
* the platform's default character set.
*/
public FallbackZipEncoding(String charset) {
this.charset = charset;
}
/**
* @see
* org.apache.tools.zip.ZipEncoding#canEncode(java.lang.String)
*/
public boolean canEncode(String name) {
return true;
}
/**
* @see
* org.apache.tools.zip.ZipEncoding#encode(java.lang.String)
*/
public ByteBuffer encode(String name) throws IOException {
if (this.charset == null) {
return ByteBuffer.wrap(name.getBytes());
} else {
return ByteBuffer.wrap(name.getBytes(this.charset));
}
}
/**
* @see
* org.apache.tools.zip.ZipEncoding#decode(byte[])
*/
public String decode(byte[] data) throws IOException {
if (this.charset == null) {
return new String(data);
} else {
return new String(data,this.charset);
}
}
}