src/main/java/org/apache/commons/compress/archivers/zip/PKWareExtraHeader.java [212:273]:
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    @Override
    public byte[] getCentralDirectoryData() {
        if (centralData != null) {
            return ZipUtil.copy(centralData);
        }
        return getLocalFileDataData();
    }

    /**
     * Get the central data length. If there is no central data, get the local
     * file data length.
     *
     * @return the central data length
     */
    @Override
    public ZipShort getCentralDirectoryLength() {
        if (centralData != null) {
            return new ZipShort(centralData.length);
        }
        return getLocalFileDataLength();
    }

    /**
     * Get the header id.
     *
     * @return the header id
     */
    @Override
    public ZipShort getHeaderId() {
        return headerId;
    }

    /**
     * Get the local data.
     *
     * @return the local data
     */
    @Override
    public byte[] getLocalFileDataData() {
        return ZipUtil.copy(localData);
    }

    /**
     * Get the length of the local data.
     *
     * @return the length of the local data
     */
    @Override
    public ZipShort getLocalFileDataLength() {
        return new ZipShort(localData != null ? localData.length : 0);
    }

    /**
     * @param data
     *            the array of bytes.
     * @param offset
     *            the source location in the data array.
     * @param length
     *            the number of bytes to use in the data array.
     * @see ZipExtraField#parseFromCentralDirectoryData(byte[], int, int)
     */
    @Override
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src/main/java/org/apache/commons/compress/archivers/zip/UnrecognizedExtraField.java [54:108]:
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    @Override
    public byte[] getCentralDirectoryData() {
        if (centralData != null) {
            return ZipUtil.copy(centralData);
        }
        return getLocalFileDataData();
    }

    /**
     * Get the central data length.
     * If there is no central data, get the local file data length.
     * @return the central data length
     */
    @Override
    public ZipShort getCentralDirectoryLength() {
        if (centralData != null) {
            return new ZipShort(centralData.length);
        }
        return getLocalFileDataLength();
    }

    /**
     * Get the header id.
     * @return the header id
     */
    @Override
    public ZipShort getHeaderId() {
        return headerId;
    }

    /**
     * Get the local data.
     * @return the local data
     */
    @Override
    public byte[] getLocalFileDataData() {
        return ZipUtil.copy(localData);
    }

    /**
     * Get the length of the local data.
     * @return the length of the local data
     */
    @Override
    public ZipShort getLocalFileDataLength() {
        return new ZipShort(localData != null ? localData.length : 0);
    }

    /**
     * @param data the array of bytes.
     * @param offset the source location in the data array.
     * @param length the number of bytes to use in the data array.
     * @see ZipExtraField#parseFromCentralDirectoryData(byte[], int, int)
     */
    @Override
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