/**
  * lzma 壓縮
  *
  * <p>MODE_1(1, 0, 16, 64, Encoder.EMatchFinderTypeBT2, 3, 0, 2),
  *
  * <p>MODE_2(2, 0, 20, 64, Encoder.EMatchFinderTypeBT2, 3, 0, 2),
  *
  * <p>MODE_3(3, 1, 19, 64, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_4(4, 2, 20, 64, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_5(5, 2, 21, 128, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_6(6, 2, 22, 128, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_7(7, 2, 23, 128, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_8(8, 2, 24, 255, Encoder.EMatchFinderTypeBT4, 3, 0, 2),
  *
  * <p>MODE_9(9, 2, 25, 255, Encoder.EMatchFinderTypeBT4, 3, 0, 2);
  *
  * @param value
  * @return
  */
 public static byte[] lzma(byte[] value) {
   byte[] result = new byte[0];
   //
   ByteArrayInputStream in = null;
   ByteArrayOutputStream out = null;
   try {
     Encoder encoder = new Encoder();
     in = new ByteArrayInputStream(value);
     out = new ByteArrayOutputStream();
     // fast
     encoder.SetEndMarkerMode(true);
     encoder.SetAlgorithm(0);
     // dictionarysize是主要佔用記憶體的地方(0-30)
     encoder.SetDictionarySize(1 << 20);
     // fb是主要速度的地方(越小越快壓縮率越低,5-273)
     encoder.SetNumFastBytes(64);
     encoder.SetMatchFinder(Encoder.EMatchFinderTypeBT2);
     encoder.SetLcLpPb(3, 0, 2);
     encoder.WriteCoderProperties(out);
     //
     encoder.Code(in, out, -1, -1, null);
     result = out.toByteArray();
   } catch (Exception ex) {
     ex.printStackTrace();
   } finally {
     IoHelper.close(in);
     IoHelper.close(out);
   }
   return result;
 }
Ejemplo n.º 2
0
 private static byte[] encodeToLZMA(byte[] detailsData) throws IOException {
   Encoder lzma = new Encoder();
   ByteArrayOutputStream lzOut = new ByteArrayOutputStream();
   lzma.SetEndMarkerMode(true);
   lzma.WriteCoderProperties(lzOut);
   lzOut.write(getBytes(detailsData.length));
   lzma.Code(
       new ByteArrayInputStream(detailsData), lzOut, 0, 0, new ProgressLZMA(detailsData.length));
   lzOut.close();
   detailsData = lzOut.toByteArray();
   return detailsData;
 }