| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http.entity; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.PushbackInputStream; |
| import java.util.zip.Inflater; |
| import java.util.zip.InflaterInputStream; |
| import java.util.zip.ZipException; |
| |
| /** |
| * Deflate input stream. This class includes logic needed for various Rfc's in order |
| * to reasonably implement the "deflate" compression style. |
| */ |
| public class DeflateInputStream extends InputStream { |
| |
| private final InputStream sourceStream; |
| |
| public DeflateInputStream(final InputStream wrapped) throws IOException { |
| |
| final PushbackInputStream pushback = new PushbackInputStream(wrapped, 2); |
| final int i1 = pushback.read(); |
| final int i2 = pushback.read(); |
| if (i1 == -1 || i2 == -1) { |
| throw new ZipException("Unexpected end of stream"); |
| } |
| |
| pushback.unread(i2); |
| pushback.unread(i1); |
| |
| boolean nowrap = true; |
| final int b1 = i1 & 0xFF; |
| final int compressionMethod = b1 & 0xF; |
| final int compressionInfo = b1 >> 4 & 0xF; |
| final int b2 = i2 & 0xFF; |
| if (compressionMethod == 8 && compressionInfo <= 7 && ((b1 << 8) | b2) % 31 == 0) { |
| nowrap = false; |
| } |
| sourceStream = new DeflateStream(pushback, new Inflater(nowrap)); |
| } |
| |
| /** |
| * Read a byte. |
| */ |
| @Override |
| public int read() throws IOException { |
| return sourceStream.read(); |
| } |
| |
| /** |
| * Read lots of bytes. |
| */ |
| @Override |
| public int read(final byte[] b) throws IOException { |
| return sourceStream.read(b); |
| } |
| |
| /** |
| * Read lots of specific bytes. |
| */ |
| @Override |
| public int read(final byte[] b, final int off, final int len) throws IOException { |
| return sourceStream.read(b, off, len); |
| } |
| |
| /** |
| * Skip |
| */ |
| @Override |
| public long skip(final long n) throws IOException { |
| return sourceStream.skip(n); |
| } |
| |
| /** |
| * Get available. |
| */ |
| @Override |
| public int available() throws IOException { |
| return sourceStream.available(); |
| } |
| |
| /** |
| * Mark. |
| */ |
| @Override |
| public void mark(final int readLimit) { |
| sourceStream.mark(readLimit); |
| } |
| |
| /** |
| * Reset. |
| */ |
| @Override |
| public void reset() throws IOException { |
| sourceStream.reset(); |
| } |
| |
| /** |
| * Check if mark is supported. |
| */ |
| @Override |
| public boolean markSupported() { |
| return sourceStream.markSupported(); |
| } |
| |
| /** |
| * Close. |
| */ |
| @Override |
| public void close() throws IOException { |
| sourceStream.close(); |
| } |
| |
| static class DeflateStream extends InflaterInputStream { |
| |
| private boolean closed = false; |
| |
| public DeflateStream(final InputStream in, final Inflater inflater) { |
| super(in, inflater); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (closed) { |
| return; |
| } |
| closed = true; |
| inf.end(); |
| super.close(); |
| } |
| |
| } |
| |
| } |
| |