Problems with zlib

Question

When a try to inflate a stream, it always return needDictionary and result array is 0.
I try to use setDictionary:
Inflater decompresser = new Inflater();
decompresser.setInput(output, 0, 156);
Adler32 adler = new Adler32();
adler.update(output, 0, 156);
long d = adler.getValue();
decompresser.setDictionary( longToDWord(d) );
resultLength = decompresser.inflate(result);
But it always have error:
Exception in thread "main" java.lang.IllegalArgumentException
at java.util.zip.Inflater.setDictionary(Native Method)
at java.util.zip.Inflater.setDictionary(Inflater.java:143)
at java.util.zip.Inflater.setDictionary(Inflater.java:157)
at testzlib.Main.main(Main.java:94) ==> resultLength = decompresser.inflate(result);
Java Result: 1
Why? I don't understand this error.

Answer 1

jotremar wrote:
byte[] result = new byte[5000];This shouldn't give an IllegalArgumentException.
It is data from network (slsk protocol)I'm not familiar with [*Soulseek*|http://en.wikipedia.org/wiki/Soulseek] protocol. Data compression is used for P-2-P transferts ?
"output" start with 0x78da3d8e410ac230 and end with 0x6e037fde4ffa3187
output must be an array of bytes that contains the compressed data. For what I understand, it makes a lot of bytes.
if packet is corrupted, do Inflater a warning about it?IMO, there's no compression at all. It would make no sense to compress MP3 files to shared them through a P-2-P network.