51 lines
1.3 KiB
Java
51 lines
1.3 KiB
Java
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/*
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* LZMA2Encoder
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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package org.tukaani.xz;
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import org.tukaani.xz.lzma.LZMAEncoder;
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class LZMA2Encoder extends LZMA2Coder implements FilterEncoder {
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private final LZMA2Options options;
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private final byte[] props = new byte[1];
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LZMA2Encoder(LZMA2Options options) {
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if (options.getPresetDict() != null)
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throw new IllegalArgumentException(
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"XZ doesn't support a preset dictionary for now");
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if (options.getMode() == LZMA2Options.MODE_UNCOMPRESSED) {
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props[0] = (byte)0;
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} else {
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int d = Math.max(options.getDictSize(),
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LZMA2Options.DICT_SIZE_MIN);
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props[0] = (byte)(LZMAEncoder.getDistSlot(d - 1) - 23);
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}
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// Make a private copy so that the caller is free to change its copy.
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this.options = (LZMA2Options)options.clone();
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}
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public long getFilterID() {
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return FILTER_ID;
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}
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public byte[] getFilterProps() {
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return props;
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}
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public boolean supportsFlushing() {
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return true;
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}
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public FinishableOutputStream getOutputStream(FinishableOutputStream out) {
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return options.getOutputStream(out);
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}
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}
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