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Allow setting preset for LZMACompressorOutputStream #664

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Allow setting preset for LZMACompressorOutputStream #664

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19 changes: 19 additions & 0 deletions src/main/java/org/apache/commons/compress/compressors/lzma/LZMACompressorOutputStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,25 @@ public LZMACompressorOutputStream(final OutputStream outputStream) throws IOExce
super(new LZMAOutputStream(outputStream, new LZMA2Options(), -1));
}

/**
* Creates a LZMA compressor using the specified LZMA2 preset level.
* <p>
* The presets 0-3 are fast presets with medium compression. The presets 4-6 are fairly slow presets with high compression. The default preset is 6.
* </p>
* <p>
* The presets 7-9 are like the preset 6 but use bigger dictionaries and have higher compressor and decompressor memory requirements. Unless the
* uncompressed size of the file exceeds 8&nbsp;MiB, 16&nbsp;MiB, or 32&nbsp;MiB, it is waste of memory to use the presets 7, 8, or 9, respectively.
* </p>
*
* @param outputStream the stream to wrap
* @param preset the preset
* @throws IOException on error
*/
@SuppressWarnings("resource") // Caller closes
public LZMACompressorOutputStream(final OutputStream outputStream, final int preset) throws IOException {
super(new LZMAOutputStream(outputStream, new LZMA2Options(preset), -1));
}

/**
* Finishes compression without closing the underlying stream. No more data can be written to this stream after finishing.
*
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