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  • How should I compress a file with multiple bytes that are the same with Huffman coding?

    - by Omega
    On my great quest for compressing/decompressing files with a Java implementation of Huffman coding (http://en.wikipedia.org/wiki/Huffman_coding) for a school assignment, I am now at the point of building a list of prefix codes. Such codes are used when decompressing a file. Basically, the code is made of zeroes and ones, that are used to follow a path in a Huffman tree (left or right) for, ultimately, finding a byte. In this Wikipedia image, to reach the character m the prefix code would be 0111 The idea is that when you compress the file, you will basically convert all the bytes of the file into prefix codes instead (they tend to be smaller than 8 bits, so there's some gain). So every time the character m appears in a file (which in binary is actually 1101101), it will be replaced by 0111 (if we used the tree above). Therefore, 1101101110110111011011101101 becomes 0111011101110111 in the compressed file. I'm okay with that. But what if the following happens: In the file to be compressed there exists only one unique byte, say 1101101. There are 1000 of such byte. Technically, the prefix code of such byte would be... none, because there is no path to follow, right? I mean, there is only one unique byte anyway, so the tree has just one node. Therefore, if the prefix code is none, I would not be able to write the prefix code in the compressed file, because, well, there is nothing to write. Which brings this problem: how would I compress/decompress such file if it is impossible to write a prefix code when compressing? (using Huffman coding, due to the school assignment's rules) This tutorial seems to explain a bit better about prefix codes: http://www.cprogramming.com/tutorial/computersciencetheory/huffman.html but doesn't seem to address this issue either.

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  • Server IP must be a LAN IP (Port Forwarding Netgear)

    - by rphello101
    I'm trying to set up a server (Apache) on my computer (fairly new to it). As I understand it, for it to be accessible to other computers, I need to forward port 80. When I try to forward the port though, I get the error: Server IP must be a LAN IP. I noticed in ipconfig that my default gateway is different than my wireless router. My computer is not hardwired, not on WiFi. Furthermore, I do not, at this point, have a static IP. I read that it should still work with a dynamic IP until it changes. Any ideas on what I can do?

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  • DVI problem with LG L204WT

    - by Holgerwa
    I have a LG L204WT which has VGA and DVI connectors. Until recently, I have used the monitor via VGA, but now I have upgraded the graphics board and switched to DVI. The problem is that each time after the computer starts, the monitor either doesn't show anything (black screen, but doesn't go into standby) or the picture is distorted. I then switch the monitor off and on several times, and at some point it starts correctly and then I can work as usual. This only happens on startup. It is one out of 3 monitors, the other two work fine. It seems to me as if the monitor is not able to synchronize on the DVI signal and either shows a distorted picture or nothing at all. There are no settings in the monitor setup that would change anything. What could be the problem?

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  • Ubuntu for Phones / Touch vs Android, IOS and BlackBerry OS

    - by Ome Noes
    Currently I have a LG Google Nexus 4 with lots of issues because of the latest android 4.3 update. Since the update my battery drains within 7 hours when in it's standby / idle and even faster when I use it normaly! Before the Nexus 4 I had an Iphone but got sick of IOS because for me it's to much of a closed operating system and I dislike having to work with either Windows or Itunes. At this point neither Google or LG is willing to provide me (and all the others that have similar Nexus 4 problems) with a solution or even a reaction... Also i'm not very fond of the idea that the NSA (and maybe others) can and is currently monitoring millions of Android, IOS and BlackBerry OS devices all over the world. Since i've been using Ubuntu now very happily for almost 5 years I see Ubuntu for Phones / Touch as the only remedy for all this BS. Please be so kind to let me know when you will have a fully functioning version of your Ubuntu for Phones / Touch ready for consumer use. I'm realy sad that the Ubuntu Edge campaign didn't work out and hope to see lots and lots of future smartphones outfitted with Ubuntu a.s.a.p.! Keep up the good work!

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  • If an old Exchange server is not part of a domain, does that imply that it can be safely removed without affecting mailflow?

    - by Bigbio2002
    We are doing some cleanup, and there is an old Exchange VM hanging around that we want to get rid of. We do not have the local admin credentials, but we can ascertain that it is not part of the current domain. Seeing as the new production Exchange server is working fine, is it safe to power off and remove the old server? *I should probably note that this is not an Edge Transport server. There was an upgrade to Exchange 2013 at some point in the past, and there is only one functioning Exchange server now.

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  • SharePoint 2007 Enabling Incoming Email Error

    - by Cherie Riesberg
    Symptom: When configuring incoming e-mail, the e-mails come through just fine if the server name is in the e-mail address: [email protected] but when you change it to a vanity name [email protected], the message is bounced back and you get this error: Delivery has failed to these recipients or distribution lists: [email protected] Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this  message for you.    Please provide the following diagnostic text to your system administrator. The following organization rejected your message: servername01.fqdn.com.   Problem: The SharePoint server relay rejects the message because it doesn't recognize the name.  You have set it up in Exchange, but you need to set up an alias in the SMTP service on the SharePoint server;   Solution: Configure an Alias Domain An alias domain is an alias of the default domain. You can set up alias domains that use the same settings as the default domain. Messages that are received by the SMTP Service for an alias domain are placed in the Drop folder that is designated for the default domain. To configure an alias domain, follow these steps: Start IIS Manager or open the IIS snap-in. Expand Server_name, where Server_name is the name of the server, and then expand the SMTP virtual server that you want (for example, Default SMTP Virtual Server). Right-click Domains, point to New, and then click Domain. The New SMTP Domain Wizard starts. Click Alias, and then click Next. Type a name for the alias domain in the Name box, and then click Finish. Quit IIS Manager or close the IIS snap-in.

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  • Laptop won't load an OS or even an OS setup.

    - by Talasan Nicholson
    My fiancé's laptop started to crash and would get BSOD errors to the point that she couldn't even boot up because it would either take forever or just crash. So I figured I'd try to reformat, as it's done this before and this was the solution last time. On Windows 7, it will not go passed the "Setup is starting..." screen. On Windows XP, it crashes once the setup is about to start (BSOD). I shut it down and let it sit for 5+ hours, in case it was overheating, but it's doing the same thing anyway. By now, I figure it's something to do with the hardware but I hope not. Any ideas?

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  • Advice for outdoor wifi hardware and topology

    - by Robot
    I haven't setup any wifi networks other than an access point or two at any single location, so I'd like advice on how to setup an outdoor/weatherproof network in an area approximately 150 feet by 200 feet. The interesting thing is there are a pair of pools in the middle of the coverage area. Here is a picture: blue is pool, green is coverage area, yellow is building with wired access. Can anyone advise me on weatherproof APs, antennas and placement for best coverage of the pool deck? I've looked at the Meraki stuff, but I'm thinking it's overkill.

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  • How can I get my email to go to Gmail and my hosted server?

    - by Joseph
    I've switched my main domain to point the MX to Google Apps, and my actual domain's server with the lowest MX priority. My idea is to have my primary emails on Google Apps, where the secondary are via Cpanel. Is this even possible? Currently MX records read: 0 Google 4 Google 4 Google 9 Google 9 Google 10 My server I have [email protected] which is added in G. Apps, and [email protected] which is only added in cpanel. Is there anyway to get this to work?

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  • IIS6 can't find site on local network

    - by chezy525
    I have a windows 2003 server with dual NICs running IIS6. I can access everything remotely, but the internal network can't seem to find the site regardless of which IP Address I try to go to. There are really several weird things that are happening here, but I'm going to limit this question to what I'm guessing to be the simplest problem (the solution to which I'm hoping solves other things as well): From the server itself, I can access the webpage using the primary IP address (i.e. http://192.168.1.2/index.htm), but not using the secondary IP address (i.e. http://10.10.10.2/index.htm). Self pinging both IP addresses works, and the "Web site identification" in IIS has the IP address set to "(All Unassigned)"... which I believe should bind both IP addresses to this site. I apologize if I'm not providing enough details about my setup, but at this point I don't even know what's relevant...

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  • How to choose between using a Domain Event, or letting the application layer orchestrate everything

    - by Mr Happy
    I'm setting my first steps into domain driven design, bought the blue book and all, and I find myself seeing three ways to implement a certain solution. For the record: I'm not using CQRS or Event Sourcing. Let's say a user request comes into the application service layer. The business logic for that request is (for whatever reason) separated into a method on an entity, and a method on a domain service. How should I go about calling those methods? The options I have gathered so far are: Let the application service call both methods Use method injection/double dispatch to inject the domain service into the entity, letting the entity do it's thing and then let it call the method of the domain service (or the other way around, letting the domain service call the method on the entity) Raise a domain event in the entity method, a handler of which calls the domain service. (The kind of domain events I'm talking about are: http://www.udidahan.com/2009/06/14/domain-events-salvation/) I think these are all viable, but I'm unable to choose between them. I've been thinking about this a long time and I've come to a point where I no longer see the semantic differences between the three. Do you know of some guidelines when to use what?

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  • Getting IIS redirects proper for second HTTP site

    - by Gotenks
    2x IIS sites on one host. I have mainsite.domain.com and secondsite.seconddomain.com. Both sites point to the same IP in public DNS. Nothing wrong with mainsite.domain.com, it redirects and goes to its own HTTPS site without issue. Going to secondsite.seconddomain.com without HTTPS, it re-directs me to the HTTPS mainsite.domain.com when I want it to go to its own secured site. It's odd that HTTPS secondsite.seconddomain.com still works as expected. Is there anyway to make HTTP of secondsite.seconddomain.com redirect to its own HTTPS entry?

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  • Default documentroot apache does not work

    - by James Wise
    I have apache version 2.2 and php 5.3.15 on a single server. I configured virtual hosting and a default vhost. 0_default_.conf - goes to /var/www/default sub.domain.com.conf - goes to /var/www/sub.domain.com My question is, how could I set the default documentroot to sub.domain.com permanently? That means all request should be redirected to sub.domain.com. I try to remove 0_default_.conf but when viewing the page it display the php source code of sub.domain.com. Here is my configurations -- http://pastebin.com/4e3awUJ4 Although I can create index.php to /var/www/default and permanently redirect to sub.domain.com site but it's not viable solution for me because what if I didn't point the ip address of sub.domain.com to the server so user cannot view that subdomain. I would appreciate if anyone could share their knowledge and wisdom. Thanks. JamesW

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  • Fastest approach to 3D animation

    - by HappyFerret
    I'm currently tasked with designing a small HTML5 game. Having done everything by myself so far (3D models, codebase, game design, etc) I'm now at a point where I'm running out of time. I've less than a day to animate and bind everything together. However, that's exactly my problem. I was under the naive impression that everything would be easier if I went with pre-rendered 3D models. However, I didn't consider the most difficult part. Animation. After having spent over an hour trying to figure out messiahStudio, I figured it's time to ask for outside help. Is there any easier solution to 3D animation than 3D rigging? What I'm basically looking for is some sort of tool that allows me to simply grab and move/deform select polygons. It doesn't have to be as life-like and accurate as rigging, just efficient enough. Were the circumstances any different, I might just learn how to rig. But that's sorely out of scope right now. PS:The models were created in Sculptris but are fairly low-poly.

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  • Remote access and local access same hostname

    - by cpf
    Hi serverfault, I have a server in a clients network, seperated from theirs with a router/firewall, the intention is to have this server available through one hostname (example.com) My idea is to have (at least) a DNS server in the outside, to have outside (out of the clients' network) access the internal server. The problem would at that point be the internal client (PC A) My question: What would I have to do to make something like this work? Is it even possible or already done? The goal is to not have to change anything on either PC A or PC B, while both should access the same "internal server" while surfing to "example.com" Perhaps adding logic to the DNS server would work (Detect the external IP of internal client [PC A] is the same as the IP for example.com - Give the local IP as reply?) Anyhow: Thanks for helping me think on this!

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  • Is Exchange protected from/allow back dated emails?

    - by David
    Does Exchange Server adequately protect against backdating items in a mailbox folder? I want to determine from an auditing perspective what level of risk exists/what trust can be put into Exchange database records. Is there a (mis)feature that allows end point users to modify the sent/recieved date fields on their own messages? Is there a reasonable way short of hand editing the files for an Exchange Server admin to make such a change? And most importantly: Is there any kind of "sequence number" that we could use to audit Exchange records for evidence of date manipulation (ex. msg100 = Dec 15, msg101 = Dec 10, msg102 = Dec 16)

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  • Can't boot after compiling 3.1 kernel, can only get to terminal

    - by olssy
    Long story short: I tried compiling kernel 3.1 on Ubuntu 11.10 at the same time I had an update waiting for a reboot. Computer would boot to a black screen and would hang there. Ended up installing 11.10 on top of old install with a Live CD. Now I had a purple screen on bootup but it would end up booting. Realized Grub was the problem and tried some stuff but nothing worked. I ended up trying to install propriety ATI video drivers and since that nothing has worked, no grub menu(purple screen) and when it boots into the kernel it ends up hanging, I can sometimes get a terminal up with alt-fx. I have tried removing the ati drivers with the ati script, purging my fglrx driver, reconfiguring my xconf.org and following any tutorial I can find about fixing a broken graphics driver, but to no avail. I've gotten to a point were it seems that the ati propriety drivers are correctly loaded but it still has no grub boot menu and won't boot into Ubuntu. I've chased down my logs and this line is from kern.log: unity-greeter[3269]: segfault at 0 ip b7245cbbsp bf9d3900 error 4 in libgio-2.0.so.0.3000.0[b71ad000+142000] That line leads me to believe I don'T have the correct libgio-2 librairy on my system but have no idea how to find out what package has the correct version... My xorg.conf has no errors and seems to imply the fglrxdrm module got loaded correctly. Would be a bit complicated pasting the whole file here but if it would help I'll post it. LAstly, running fglrxinfo give me: Error: Unable yo open display (null) Any help or link to another tutorial would be appreciated. Thanks.

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  • Limiting my heavy thinking to my job [closed]

    - by Robin Castlin
    This might be a weird problem which is only to a half relevant to actual programming, but hopefully there are people here that knows what I'm talking about. Basicly I'm proud of how I can deal with coding problems and fix them in short notice and many other aspects like building new systems and such. I'm fast on finding solutions and I often think about the impact my changes does to existing systems and so on, therefor preventing problem from arising at all and such. I am simply happy with how my mind operates when it comes to programming and I wouldn't want to change it at all. The problem, however is when I'm not programming. I find myself rather limited in social situations. I can't determine if it is through programming, but I sometimes think way to much about the consequences when it comes to being social. I know from own experience that most times you earn by not thinking about consequences, but it's hard for me not to. Often my friends tells me "I think too much" and even though I agree, I can't seem to change this behavior. My brain wants to think, and it likes to overthink simple stuff. Does anyone recognize the bad habit of not leaving advanced thinking at work, and in what way do you deal with it? If this isn't a suitable place to ask this question, I apologize and hope you may point me to the right site.

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  • KB972455 Windows Server Update Services 3.0 SP2

    - by Sniek NL
    Dear people, My Small Business Server 2003 failed to install this update SP2 for WSUS3.0. The update is not available for rollback. WSUS 3.0 is not to be found in my software configscreen or startup menu. Some files have been deleted from the hard drive and last but not least. The service will not run and .NET runtime errors keep flooding my logs. Question. How to remove an update or program which is not listed in add/remove software anymore. Since the update it fails to run WSUS. Event-id: 0 Category: none Source: .NET Runtime ERROR: This error keeps flooding my logs. I am hesitant to roll back to a system restore point since exchange is running on the same disks.... :)

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  • Process that needs a volume starting before volume mounts

    - by user36126
    The destination for incoming CrashPlan backups on my server (11.04) is /media/SeagateBig (SeagateBig is the volume name of my 2TB USB drive). When the server boots, two things happen: 1) SeagateBig auto-mounts and 2) CrashPlan starts. The problem is, that often these two things don't happen in that order. Then I get: Crashplan starts looks for /media/SeagateBig doesn't find it instead of waiting for it, CREATES IT Now it's backing up onto my / filesystem. NOT COOL. Meanwhile, when SeagateBig finally gets around to mounting, it finds that /media/SeagateBig already exists, shrugs, and creates /media/SeagateBig_ as its mount point. What I need is a way for the order to be enforced - where SeagateBig mounts and then and only then the CrashPlan service is started. Unless I learn that CrashPlan can be told to wait for its destination directory, never to create it... which I am also investigating. But the CrashPlanEngine script is installed by the product so I am loath to modify it, as I know I could by having it loop until df greps successfully for "SeagateBig".

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  • Cannot boot: FGLRX 8.780 + Kernel 2.6.35-25

    - by pluc
    The situation before this all happened is pretty standard. I have a HP Pavillion dv5 laptop with an ATI Mobility Radeon 4200 series. It always worked fine with Ubuntu for as long as I can remember. However, at one point, something happened and truly made a majestic mess of things. It might've been extra repos I enabled with Ubuntu Tweak - I do not know. But something made it so that my system would not boot any longer. And when I say "won't boot", this is what I mean: - Durning a normal bootup, any entries (except Windows) selected with GRUB (or BURG, not even sure which one I'm using anymore) will spawn the Ubuntu loading screen - then try to start X (or GDM) 5 times. The screen goes to dark, black and back to the Ubuntu loading screen. Then it just stays there until I spawn another TTY. I have no idea what is happening or why. There are no errors in my logs, and I'm truly at a loss here. I've linked three files: Xorg.0.log, the output of dmesg and the GDM log: Xorg.0.log: http://ubuntu.pastebin.com/tpVKc2tc dmesg: ubuntu.pastebin.com/Nd5aYj45 gdm's :0.log: couldn't post due to lack of points :( Let me know if any of you more knowledgeable folks can restore some sanity in my life. Any help is greatly apreciated.

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  • Mysql Encryption and Key managment

    - by microchasm
    I am developing a local intranet system in PHP/MySQL to manage our client data. It seems that the best practice would be to encrypt the sensitive data on the MYSQL server as it is being entered. I am not clear, though, on what would be the best way to do this while still having the data readily accessible. It seems like a tough question to answer: where is the key(s) stored? How to best protect the key? If the key is stored on each users' machine, how to protect it if the machine is exploited? If the key is exploited, how to change the key? If the key is to be stored in the db, how to protect it there? How would users access it? If anyone could point me in the right direction, or give some tips I'd be very grateful. Thanks.

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  • Take a Tour of the Future

    - by Tom Caldecott-Oracle
    Visit Our HQ Usability Lab During Oracle OpenWorld 2014 You want to look behind the scenes at the Oracle Applications User Experience Usability Lab on the campus of our headquarters. No problem. You’re invited to join an exclusive tour. When? Thursday, October 2 or Friday, October 3. Where? Redwood Shores, Calif.  And what will you see on the tour? The future—how we test future product designs and the advanced technology we use to do that. You’ll also view early demos of upcoming enterprise software designs for tables and mobile phones.  We’ll provide round-trip transportation, with the pickup and drop-off point being the InterContinental San Francisco.  Space is limited, so reserve your spot now. Want to know more about the tour and other Oracle Applications User Experience activities at Oracle OpenWorld? Visit UsableApps. Welcome to the future.

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  • Google Analytics Not tracking data correctly IP-address issue?

    - by PaperThick
    I have developed a small site for a client and the site has been placed inside a <iframe> at the clients site. The GA-script I'm using looks like this: <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push( ['_setAccount', 'UA-XXXXXXXX-2'], //My company's GA-account ['_trackPageview'], ['b._setAccount', 'UA-XXXXXXXX-1'], // Test GA-account ['b._trackPageview'], ['th._setAccount', 'UA-XXXXXXX-3'], ['th._setDomainName', '.clientdomain.se'], // Client GA-account ['th._trackPageview'] ); (function () { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script> </head> As you can see I report the GA pageviews to the client as well. The GA script is tracking visitors and pageviews at both ends. But the problem is that on my clients side the visitor-count is more than double what they are on my end (20 000 vs 5 000). At first I thought that it was being duplicated at some point but when I checked my Crazy-Egg account I saw that it had tracked over 10 000 visits and then stopped tracking because that was my limit on the account. The page my site is on is on a IP-address (http://XXX.XXX.XX.X/campaign/) and not on a "valid url". Could that be an issue why some of the visitors isn't beeing tracked? Thanks in advance

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  • Wireless range extender throughput extremely slow.

    - by Alan B
    I've got a Belkin 54G router connected to the internet, and a Belkin range extender model F5D7132. I can get the range extender connected to the parent router SSID no problem, in repeater mode as opposed to access point mode. My Windows 7 laptop connects to the extender, which has a different SSID, and it connects with the full 5 bars. The issue is that when going through the extender internet performance is murderously slow, even getting the config pages of the extender or router is bad. When I connect directly to the router, all is well.

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