How to change Longs saved in a String back to Longs

Question

What I want to do is save 4x8bytes as a 64bit Long. And decode that 64bit Long into 4x8bytes again.

I know you may not understand it but I have an Encoder, which uses bytes 8 bits to make a 64 bit Long. And I'm saving multiple of those an example: "-223784 2432834 -34233566" and I want to read every number split it when " " is the character and put it in a long[].

Currently I have this Code:

FileInputStream fin = new FileInputStream( IOUtils.path + File.separator + "eclipse.hm" );
    String c = "";
    long[] longs = new long[1000000];

    int b,ggg=0;
    while((b=fin.read())!=-1) {
        if( (char)b==' ' ) {
            longs[ggg++] = Long.parseLong(c);
            c = "";
        } else {
            c+=(char) b;
        }
        fetched++;
    }
    fin.close();

The Method of my "Decoder" is as follows:

public static Object decode(long[] input) throws DataFormatException, IOException, ClassNotFoundException {
    byte[] toInflate = BitSet.valueOf(input).toByteArray();

    Inflater inflater = new Inflater();
    inflater.setInput(toInflate);

    byte[] deflated = new byte[ toInflate.length*2 ];
    inflater.inflate(deflated);
    inflater.end();

    ObjectInputStream ois = new ObjectInputStream( new ByteArrayInputStream(deflated) );
    Object r = ois.readObject();
    ois.close();
    return r;
}

The Decoder works I had tested it with my Encoder and directly input the output of the Encoder. So there must be a read error.

and I'm literally speechless, as well as I don't have anything in mind to fix this problem...

Thanks for help, sincerly Richee.

What is your question? [Edit] your text and make it clear what you want to do, what you have tried, and what results you get, including unexpected results or error messages. — , Sep 11 '18 at 20:14

Ekrem Demirhan · Accepted Answer · 2018-09-11T19:12:21.143

1

You can use some built-in String functions to split string. After that you need to do some transformations from string to long for all elements that you get after split step.

edited Sep 11 '18 at 19:12

answered Sep 11 '18 at 18:47

Ekrem Demirhan

204
3
11

Do you need look for char by char when read from a file? I edited my answer so you can check if you do any optimization on your own code. I tested it with a nearly 1000000 character long string. – Ekrem Demirhan Sep 11 '18 at 19:10
1

Thanks now it works, I was sure I did the same thing as well and it did not work... Guess I have just done something else wrong in that method then.. Thanks :) – Richee Nektar Sep 11 '18 at 19:14
Problem Idk why but the Stream corrupts – Richee Nektar Sep 11 '18 at 19:33

score 0 · Answer 2 · answered Sep 12 '18 at 15:11

0

To fix this Issue I tried, removing the Deflater from my Encoder and Decoder(Inflater). After that it worked so now I am wondering why does the Deflater/Inflater "destroy" my StreamHeader....

Anyways sorry for taking your time...

answered Sep 12 '18 at 15:11

Richee Nektar

25
5

How to change Longs saved in a String back to Longs

2 Answers2