13 replies to this topic

[gandudu]

i have to get 64-bit from a string.
Eg:
String ss = "Hello fifa world i am coming";
I wish to split the ss into 64-bit each;

how can i do that?

[CyrillC]

Hmm. ASCII is a 8-Bit system, so if you cut the String into 8 pairs of 8 characters, you'll have 64bit parts.
Just an Idea.. Not really sure..
What language do you use?

[gandudu]

Java, Netbeans
Can provide with coding example?

[abzero]

Use getBytes function, and then combine each group of 8 using left shifts and the bitwise or operator.

[gandudu]

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks

[abzero]

    Bytes[] stringBytes = str.getBytes();

    

    for(int c=0;c<stringBytes.length;c+=8)

    {

        long res = (stringBytes[c]<<(64-8) |

                         stringBytes[c+1] <<(64-16) |

                         stringBytes[c+2] <<(64-24) |

                         stringBytes[c+3] <<(64-32) |

                         stringBytes[c+4] <<(64-40) |

                         stringBytes[c+5] <<(64-48) |

                         stringBytes[c+6] <<(64-56) |

                         stringBytes[c+7]);

            //Res contains the packed 64-bit representation of the string.        

    }

This code will fail if the data doesn't contain a multiple of 8 data items. I havn't tested the code, their might be a better way that one of the good java guys might know.

Edited by abzero, 30 June 2010 - 02:17 AM.
Err off by 4 error

[gandudu]

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks

[gandudu]

i tested with string "12345678"
The output is as below:

Quote

892745532
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8
at testcoding.Main.main(Main.java:23)

an exception is thrown.

[gandudu]

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks

[abzero]

gandudu said:

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks

You can stop posting this message you've posted it three times now. There was an error in my code, I've edited it so it should not throw with that exception.

[gandudu]

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks

[gandudu]

abzero, actually i'm new to java.
can you provide the sample coding?
Thanks