/**
* lzma 解壓縮
*
* @param value
* @return
*/
public static byte[] unlzma(byte[] value) {
byte[] result = new byte[0];
//
ByteArrayInputStream in = null;
ByteArrayOutputStream out = null;
try {
Decoder decoder = new Decoder();
byte[] properties = new byte[5];
System.arraycopy(value, 0, properties, 0, 5);
if (properties.length != 5) {
throw new RuntimeException("input .lzma is too short");
}
decoder.SetDecoderProperties(properties);
//
int length = value.length - properties.length;
byte[] data = new byte[length];
System.arraycopy(value, properties.length, data, 0, length);
//
in = new ByteArrayInputStream(data);
out = new ByteArrayOutputStream();
decoder.Code(in, out, -1);
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
IoHelper.close(in);
IoHelper.close(out);
}
return result;
}
/**
* inflate stream 解壓縮
*
* @param value
* @return
*/
public static byte[] inflate(byte[] value) {
byte[] result = new byte[0];
//
InflaterInputStream inflater = null;
ByteArrayInputStream in = null;
ByteArrayOutputStream out = null;
try {
in = new ByteArrayInputStream(value);
out = new ByteArrayOutputStream();
inflater = new InflaterInputStream(in);
//
byte[] buff = new byte[BUFFER_LENGTH];
int read = 0;
while ((read = inflater.read(buff)) > -1) {
out.write(buff, 0, read);
}
//
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
IoHelper.close(in);
IoHelper.close(inflater);
IoHelper.close(out);
}
return result;
}
/**
* 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;
}
/**
* inflater 解壓縮
*
* @param value
* @return
*/
public static byte[] inflater(byte[] value) {
byte[] result = new byte[0];
Inflater inflater = null;
ByteArrayOutputStream out = null;
try {
inflater = new Inflater();
inflater.setInput(value);
//
out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
while (!inflater.finished()) {
int count = inflater.inflate(buffer);
out.write(buffer, 0, count);
}
//
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
if (inflater != null) {
inflater.end(); // 不end也不會有oom,不過還是關了吧
}
IoHelper.close(out);
}
return result;
}
/**
* deflater 壓縮
*
* @param value
* @return
*/
public static byte[] deflater(byte[] value) {
byte[] result = new byte[0];
Deflater deflater = null;
ByteArrayOutputStream out = null;
//
try {
deflater = new Deflater();
deflater.setLevel(Deflater.BEST_SPEED); // fast
deflater.setInput(value);
deflater.finish();
//
out = new ByteArrayOutputStream();
byte[] buff = new byte[1024];
while (!deflater.finished()) {
int count = deflater.deflate(buff);
out.write(buff, 0, count);
}
//
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
if (deflater != null) {
deflater.end(); // 需end,不然會有oom(約5000次時)
}
IoHelper.close(out);
}
return result;
}
/**
* deflate stream 壓縮
*
* @param value
* @return
*/
public static byte[] deflate(byte[] value) {
byte[] result = new byte[0];
//
DeflaterOutputStream deflater = null;
ByteArrayOutputStream out = null;
try {
out = new ByteArrayOutputStream();
deflater = new DeflaterOutputStream(out);
deflater.write(value, 0, value.length);
deflater.finish();
deflater.flush();
//
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
IoHelper.close(deflater);
IoHelper.close(out);
}
return result;
}
/**
* gzip 壓縮
*
* @param value
* @return
*/
public static byte[] gzip(byte[] value) {
byte[] result = new byte[0];
GZIPOutputStream gout = null;
ByteArrayOutputStream out = null;
//
try {
out = new ByteArrayOutputStream();
gout = new GZIPOutputStream(out, BUFFER_LENGTH);
gout.write(value);
gout.finish();
gout.flush();
//
result = out.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
IoHelper.close(gout);
IoHelper.close(out);
}
return result;
}
