de.schlichtherle.truezip.zip.OffsetPositionMapper Maven / Gradle / Ivy

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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.zip;

/**
 * Adds a start value to the given offset.
 *
 * @author  Christian Schlichtherle
 */
final class OffsetPositionMapper extends PositionMapper {
    final long start;

    OffsetPositionMapper(final long start) {
        this.start = start;
    }

    @Override
    long map(long offset) {
        return offset + start;
    }

    @Override
    long unmap(long offset) {
        return offset - start;
    }
}