Hi there...
I am in search for faster ways to compress/decompress images... bytes in general...
So i ve done some work... not much, i am sharing here with you guys..
Need some Inline java:
some subs:
And you can use it like this:
You will need lz4-java... download from here..
Hope helps...
I am in search for faster ways to compress/decompress images... bytes in general...
So i ve done some work... not much, i am sharing here with you guys..
Need some Inline java:
B4X:
#if java
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4Compressor;
import net.jpountz.lz4.LZ4FastDecompressor;
import java.util.Arrays;
private static int decompressedLength;
private static LZ4Factory factory = LZ4Factory.fastestInstance();
private static LZ4Compressor compressor = factory.fastCompressor();
public static byte[] compress(byte[] src, int srcLen) {
decompressedLength = srcLen;
int maxCompressedLength = compressor.maxCompressedLength(decompressedLength);
byte[] compressed = new byte[maxCompressedLength];
int compressLen = compressor.compress(src, 0, decompressedLength, compressed, 0, maxCompressedLength);
byte[] finalCompressedArray = Arrays.copyOf(compressed, compressLen);
return finalCompressedArray;
}
private static LZ4FastDecompressor decompressor = factory.fastDecompressor();
public static byte[] decompress(byte[] finalCompressedArray, int decompressedLength) {
byte[] restored = new byte[decompressedLength];
restored = decompressor.decompress(finalCompressedArray, decompressedLength);
return restored;
}
#end ifsome subs:
B4X:
#AdditionalJar: lz4-java-1.8.0
..
Private jo As JavaObject
...
public Sub Compress(bytes1() As Byte,llnt As Int) As Byte()
Return jo.RunMethod("compress", Array(bytes1,llnt))
End Sub
public Sub UnCompress(bytes1() As Byte,llnt As Int) As Byte()
Return jo.RunMethod("decompress", Array(bytes1,llnt))
End SubAnd you can use it like this:
B4X:
'aa can be a byte array you wanna compress...
Dim bb() As Byte=Compress(aa,aa.Length)
Log("New Size: " & bb.Length)
Dim cc() As Byte=unCompress(bb,aa.Length) 'You must know the uncompressed size !!! caution !!!
Log("New Size Restored: " & cc.Length)Hope helps...
at compress and uncompress !
