LZMA2Encoder.java

package org.xbib.io.compress.xz;

import org.xbib.io.compress.xz.lzma.LZMAEncoder;

class LZMA2Encoder extends LZMA2Coder implements FilterEncoder {
    private final LZMA2Options options;
    private final byte[] props = new byte[1];

    LZMA2Encoder(LZMA2Options options) {
        if (options.getPresetDict() != null) {
            throw new IllegalArgumentException(
                    "XZ doesn't support a preset dictionary for now");
        }

        if (options.getMode() == LZMA2Options.MODE_UNCOMPRESSED) {
            props[0] = (byte) 0;
        } else {
            int d = Math.max(options.getDictSize(), LZMA2Options.DICT_SIZE_MIN);
            props[0] = (byte) (LZMAEncoder.getDistSlot(d - 1) - 23);
        }

        // Make a private copy so that the caller is free to change its copy.
        this.options = (LZMA2Options) options.clone();
    }

    @Override
    public long getFilterID() {
        return FILTER_ID;
    }

    @Override
    public byte[] getFilterProps() {
        return props;
    }

    @Override
    public boolean supportsFlushing() {
        return true;
    }

    @Override
    public FinishableOutputStream getOutputStream(FinishableOutputStream out) {
        return options.getOutputStream(out);
    }
}