PartialInputStream.java

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package org.albite.io;

import java.io.IOException;
import java.io.InputStream;

/**
 *
 * @author albus
 */
public class PartialInputStream extends InputStream {
    private final InputStream   is;
    private       int           leftToRead;

    protected PartialInputStream(final PartitionedConnection pc)
            throws IOException {
        is = pc.input.openInputStream();
        skip(pc.position);
        leftToRead = pc.size;
    }

    public final int read() throws IOException {
        if (leftToRead > 0) {
            leftToRead--;
            return is.read();
        }

        return -1;
    }

    public final int available() throws IOException {
        return 0;
    }

    public final void close() throws IOException {
        is.close();
    }

    public final long skip(long left) throws IOException {
        while (left > 0) {
            left -= is.skip(left);
        }

        return left;
    }
}