org.testifyproject.tukaani.xz.LZMA2Encoder Maven / Gradle / Ivy
/*
* LZMA2Encoder
*
* Author: Lasse Collin
*
* This file has been put into the public domain.
* You can do whatever you want with this file.
*/
package org.testifyproject.tukaani.xz;
import org.testifyproject.tukaani.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(), options.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();
}
public long getFilterID() {
return FILTER_ID;
}
public byte[] getFilterProps() {
return props;
}
public boolean supportsFlushing() {
return true;
}
public FinishableOutputStream getOutputStream(FinishableOutputStream out) {
return options.getOutputStream(out);
}
}