Working directly with bits

I am working on a DNS tool. According to RFC 1035, communications with the DNS server are performed using bit streams.
I am working on some preliminary tests of a simple application. However, it would be very nice to use direct bit manipulation because several of the fields in a DNS query are single bit flags.
I have tried using byte primitives in arrays, however, due to signing, this has been problematic.
Frankly, I have not done a lot of bit math. Is their a good guide available or a means of directly manipulating bits? (I am fully willing to read. I just have not found anything significantto start with.)

Thank you Ge Ha. I looked at the BitSet class. This does allow for bitwise operations but seems to be a more "abstracted" text redition of a true bit stream. The BitSet Class uses booleans to represent the elements of the stream. This does look like a nice class for constructing bit stream representations, but I will need to do more research to verify whether or not it is viable in the application I am considering. (I will post the results.)

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Thanks

Exceptions are fixed. Code looks much better.
Now I'm looking for some fast algorithm that could run throu all bit combinations from 0 to 2 ^64^ -1 and to write them in byte[8]. In beginig with 1 +"1"+ from all 64 bits, then 2 +"1"+, 3 +"1"+ and so on to 64 +"1"+.
My previous code:
public void runAll() throws IllegalBlockSizeException, BadPaddingException, SQLException, ClassNotFoundException{
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        byte[] et = new byte[8];
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            pt[0] = (byte)n00;
            for(int n01=-128;n01<128;n01++){
                pt[1] = (byte)n01;
                for(int n02=-128;n02<128;n02++){
                    pt[2] = (byte)n02;
                    for(int n03=-128;n03<128;n03++){
                        pt[3] = (byte)n03;
                        for(int n04=-128;n04<128;n04++){
                            pt[4] = (byte)n04;
                            for(int n05=-128;n05<128;n05++){
                                pt[5] = (byte)n05;
                                for(int n06=-128;n06<128;n06++){
                                    pt[6] = (byte)n06;
                                    for(int n07=-128;n07<128;n07++){
                                        pt[7] = (byte)n07;
                                        et = encrypt(pt);
                                        ptbc = byteCount(pt);
                                        etbc = byteCount(et);
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Help!Working with bits

Hi all!
First of all sorry, because my email is too long :(
I'm trying to make read/write operations with bits buy I'm going mad. That's my problem:
I have a file called "doubles.bin" which stores numbers in double format and I need to read every data in that file, take a number of bits specified by the user and create a file with those new data,that is:
doubles.bin : ...
_1000001000001011100000_111110000000000000000000000000000000000000
num_bits_to_read = 22
new.bin: ...
1000001000001011100000
I've tried with different libraries:
BitSet ,
[java.lang.Object-> BitInputStream|http://www.iu.hio.no/~ulfu/appolonius/e-bok/vedleggA/BitInputStream.html],
[org.kc7bfi.jflac.io.BitOutputStream|http://jflac.sourceforge.net/apidocs/org/kc7bfi/jflac/io/BitOutputStream.html#writeRawULong(long,%20int)]
and the last one seems to be the most useful but I'm not sure how exactly wotks the method "writeRawULong"
so, the questions are:
1. What do you think is the most efficient library or way to solve this?
2. Does anybody know what exactly does the method "writeRawULong(long val, int bits)" of the last library?
Any help would be apreciated!

platters wrote:
jverd wrote:
Is this a text file, with the ASCII character 11010011 etc.? Or is it a binary file?
What format is it in? Not "text" or "binary". Rather, in addition to it being text or binary, which specific textual or binary format was used to encode the values? How did the file get written in the first place?"doubles.bin" has been created using the writeDouble method in class DataOutputStream, so values are stored according to the IEEE 754 floating-point "double format" bit layout.So just read it with readDouble() then.
>
>>
What specific problems are you having? "Not perfect" contains no useful information.Ok, I'm gonna try to explain well the problem.
I want to read from that "doubles.bin" each data in long format Why long format? Why not double format, since that's what you wrote it with. But if you want long format, use readLong. Every valid double is also a valid long, BUT the values will be very different. 1.0 in double will NOT be 1 in long, and 123.456 will not just be rounded to 123. They're totally different formats.
and create a new file which stores n-bits of each data read in order to create a smaller file.Huh???
The problem is that I have to create an image with the modified data and I've noticed that when the number of bits I read from each original data is multiple of 8 the image is ok but in the other case there is noise. Well, you can't just trim out arbitrary bits and expect it still to be meaningful. Have you studied up in [IEEE-754|http://en.wikipedia.org/wiki/IEEE_754]? Which bits will you strip out, and what will you replace them with when you reconstruct your double or long or whatever you're ultimately after.
I must admit, I have no clue what you're actually trying to accomplish.

UNSUPPORTED : The way it works Apache with OC4J via AJPV13 with mod_jk

RDBMS Version: 8.1.7.x
Operating System and Version: SUSE Linux 7.2 / Win NT/2k/XP
Product (i.e., OAS, IAS, etc): 9ias 1.0.2.2 OC4J 9.0.2.0.0
Product Version:
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Error number:
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java -verbose -jar oc4j.jar
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apachectl startssl
7) try to request a jsp page or servlet ..
http://localhost:7777/test.jsp
8) good luck it works fine .. !!
Matthias Roth
Technical Manager
Z|rich Investmentgesellschaft mbH
[email protected]

Thanks for the tip Mathias, it's always good to see people trying out experimental things with the products.
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I have a mid-2010 iMac and just purchased a 2TB TC, I just found out that it can't join existing wireless network with new AC standard so attached to iMac via ethernet with TC's wifi turned off. How do i access TC now? not showing up in disk utility or on desktop. It is working fine with TM. My cheeper seagate drives etc kept crashing, so i didnt trust cheeper back up options anymore. Connected those drives to TM via firewire and could see the drives and access them.
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Thanks!
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Ok... it is getting a bit clearer but there are still some questions.
I connect to the internet via airport only and it is pretty fast.
I was assuming airport in this statement in your first post meant the TC or the Express.. but I now realise we are still in the mass confusion stage where apple calls everything wireless an airport. So what you mean is the airport internal card of the computer??
Also, I didn't want to bridge TC with my new fios router that I paid 100 dollars for, to get N speed and also paying 10 dollars more a month for fast speed. I heard that bridging slows down everything and then there can be port issues with mail etc.
I think this is mistaken.
Putting the TC in bridge mode plugged into your FIOS will not slow the network.. nor will it cause mail or port issues.. in bridge the TC is just a fancy WAP and switch plus the network hard drive.
If the computer is close it will be faster than the FIOS.
You can run both wireless networks with different names.. so it is clear which is which. But you can also setup roaming so the computers themselves pick which is the best wireless.
I tried extending the wireless net work and tried joining wireless network, but the TC kept crashing and I had to keep resetting the TC. the Apple support person said these, extend wireless network and joint wireless network, are no longer a connection option with the new TC because of the new AC protocol.
Thanks again!
You cannot extend to a non-apple wireless router.
You cannot use join a wireless network because when you do the ethernet ports will be cut off.
But that has not changed.. I don't think Apple support is correct.. there has been no change with the AC model.. it is simply a fact that apple routers do not work in join wireless mode other than as a dumb client. The same applies to AC as to the earlier version.. but I have asked another person to check this.
Join in the express is the only apple router that still allows an ethernet connection.
For now you best use of the TC is bridged to the FIOS. Wireless you can sort out between several options.

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Working directly with bits

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