| /* |
| * 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 |
| * |
| * https://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 org.apache.tools.zip; |
| |
| import java.io.IOException; |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CoderResult; |
| import java.nio.charset.CodingErrorAction; |
| |
| /** |
| * A ZipEncoding, which uses a java.nio {@link |
| * java.nio.charset.Charset Charset} to encode names. |
| * |
| * <p>This implementation works for all cases under java-1.5 or |
| * later. However, in java-1.4, some charsets don't have a java.nio |
| * implementation, most notably the default ZIP encoding Cp437.</p> |
| * |
| * <p>The methods of this class are reentrant.</p> |
| */ |
| class NioZipEncoding implements ZipEncoding { |
| private final Charset charset; |
| |
| /** |
| * Construct an NIO based zip encoding, which wraps the given |
| * charset. |
| * |
| * @param charset The NIO charset to wrap. |
| */ |
| public NioZipEncoding(final Charset charset) { |
| this.charset = charset; |
| } |
| |
| /** |
| * @see org.apache.tools.zip.ZipEncoding#canEncode(java.lang.String) |
| */ |
| public boolean canEncode(final String name) { |
| final CharsetEncoder enc = this.charset.newEncoder(); |
| enc.onMalformedInput(CodingErrorAction.REPORT); |
| enc.onUnmappableCharacter(CodingErrorAction.REPORT); |
| |
| return enc.canEncode(name); |
| } |
| |
| /** |
| * @see org.apache.tools.zip.ZipEncoding#encode(java.lang.String) |
| */ |
| public ByteBuffer encode(final String name) { |
| final CharsetEncoder enc = this.charset.newEncoder(); |
| |
| enc.onMalformedInput(CodingErrorAction.REPORT); |
| enc.onUnmappableCharacter(CodingErrorAction.REPORT); |
| |
| final CharBuffer cb = CharBuffer.wrap(name); |
| ByteBuffer out = ByteBuffer.allocate(name.length() |
| + (name.length() + 1) / 2); |
| |
| while (cb.remaining() > 0) { |
| final CoderResult res = enc.encode(cb, out, true); |
| |
| if (res.isUnmappable() || res.isMalformed()) { |
| |
| // write the unmappable characters in utf-16 |
| // pseudo-URL encoding style to ByteBuffer. |
| if (res.length() * 6 > out.remaining()) { |
| out = ZipEncodingHelper.growBuffer(out, out.position() |
| + res.length() * 6); |
| } |
| |
| for (int i = 0; i < res.length(); ++i) { |
| ZipEncodingHelper.appendSurrogate(out, cb.get()); |
| } |
| |
| } else if (res.isOverflow()) { |
| |
| out = ZipEncodingHelper.growBuffer(out, 0); |
| |
| } else if (res.isUnderflow()) { |
| |
| enc.flush(out); |
| break; |
| |
| } |
| } |
| |
| ZipEncodingHelper.prepareBufferForRead(out); |
| |
| return out; |
| } |
| |
| /** |
| * @see org.apache.tools.zip.ZipEncoding#decode(byte[]) |
| */ |
| public String decode(final byte[] data) throws IOException { |
| return this.charset.newDecoder() |
| .onMalformedInput(CodingErrorAction.REPORT) |
| .onUnmappableCharacter(CodingErrorAction.REPORT) |
| .decode(ByteBuffer.wrap(data)).toString(); |
| } |
| } |