001/*
002 * Copyright 2011-2012 Stephen Connolly.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.jszip.pseudo.io;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.nio.ByteBuffer;
022
023public class PseudoFileInputStream extends InputStream {
024    private final InputStream delegate;
025    private final PseudoFile file;
026
027    public PseudoFileInputStream(PseudoFile file) throws IOException {
028        this.file = file;
029        this.delegate = file.$newInputStream();
030    }
031
032    public PseudoFileInputStream(String filename) throws IOException {
033        this.file = PseudoFileSystem.current().getPseudoFile(filename);
034        this.delegate = file.$newInputStream();
035    }
036
037    @Override
038    public int available() throws IOException {
039        return delegate.available();
040    }
041
042    @Override
043    public void close() throws IOException {
044        delegate.close();
045    }
046
047    @Override
048    public void mark(int readlimit) {
049        delegate.mark(readlimit);
050    }
051
052    @Override
053    public boolean markSupported() {
054        return delegate.markSupported();
055    }
056
057    @Override
058    public int read() throws IOException {
059        return delegate.read();
060    }
061
062    @Override
063    public int read(byte[] b) throws IOException {
064        return delegate.read(b);
065    }
066
067    @Override
068    public int read(byte[] b, int off, int len) throws IOException {
069        return delegate.read(b, off, len);
070    }
071
072    @Override
073    public void reset() throws IOException {
074        delegate.reset();
075    }
076
077    @Override
078    public long skip(long n) throws IOException {
079        return delegate.skip(n);
080    }
081
082    public PseudoFileInputChannel getChannel() {
083        return new PseudoFileInputChannel() {
084            @Override
085            public long size() throws IOException {
086                return file.length();
087            }
088
089            @Override
090            public int read(ByteBuffer dst) throws IOException {
091                int pos = dst.arrayOffset();
092                int len = dst.remaining();
093                int read = delegate.read(dst.array(), pos, len);
094                if (read > 0) {
095                    dst.position(dst.position() + read);
096                }
097                return read;
098            }
099
100            public void close() throws IOException {
101                PseudoFileInputStream.this.close();
102            }
103        };
104    }
105
106}