org.jcodec.common.io.HttpRAInputStream.java Source code

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Here is the source code for org.jcodec.common.io.HttpRAInputStream.java

Source

package org.jcodec.common.io;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.apache.commons.io.IOUtils;

/**
 * This class is part of JCodec ( www.jcodec.org )
 * This software is distributed under FreeBSD License
 * 
 * A source that reads from HTTP with random access
 * 
 * 
 * @author The JCodec project
 * 
 */
public class HttpRAInputStream extends RAInputStream {
    private URL url;
    private InputStream is;
    private long length;
    private long pos;

    public HttpRAInputStream(URL url) throws IOException {
        this.url = url;
        URLConnection connection = url.openConnection();
        is = connection.getInputStream();
        length = connection.getContentLength();
    }

    @Override
    public long getPos() {
        return pos;
    }

    @Override
    public int read() throws IOException {

        int r = is.read();
        ++pos;
        return r;
    }

    @Override
    public int read(byte[] buf) throws IOException {
        int r = is.read(buf);
        pos += buf.length;
        return r;
    }

    @Override
    public int read(byte[] buf, int off, int len) throws IOException {
        int r = is.read(buf, off, len);
        pos += len;
        return r;
    }

    @Override
    public void seek(long where) throws IOException {
        if (is != null)
            IOUtils.closeQuietly(is);
        URLConnection con = url.openConnection();
        con.addRequestProperty("range", where + "-" + length);
        is = con.getInputStream();
        pos = where;
    }

    @Override
    public long skip(long i) {
        throw new RuntimeException("Not implemented");
    }

    @Override
    public long length() throws IOException {
        return length;
    }
}