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• CRC for PNG file format

  - by darkie15

  Hi All, I need to read a PNG file and interpret all the information stored in it and print it in human readable format. While working on PNG, i understood that it uses CRC-32 for generating checksum for each chunk. But I could not understand the following information mentioned on the PNG file specification site: The polynomial used by PNG is: x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1 Here is the link for reference: http://www.w3.org/TR/PNG/ Can anyone please help me in understanding this? Regards, darkie

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• Parser generator for inline documentation

  - by Leonth

  To have a general-purpose documentation system that can extract inline documentation of multiple languages, a parser for each language is needed. A parser generator (which actually doesn't have to be that complete or efficient) is thus needed. http://antlr.org/ is a nice parser generator that already has a number of grammars for popular languages. Are there better alternatives i.e. simpler ones that support generating parsers for even more languages out-of-the-box?

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• Cache SHA1 digest result?

  - by johnathan

  I'm storing several versions of a file based on a digest of the original filename and its version, like this: $filename = sha1($original . ':' . $version); Would it be worth it to cache the digest ($filename) in memcache as a key/value pair (the key being the original + version and value the sha1 hash), or is generating the digest quick enough (for a high traffic php web app)? Thanks, Johnathan

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• Create certificate for a client app in .NET

  - by galets

  I'm looking for a server app to be routinely generating certificates for client applications using self-signed root. Is there any streamlined process in .NET to programmatically generate those certificates? I can, of course, keep spawning makecert or openssl, but I was looking for more programmatic, in-memory method, when you just get X509Certificate on output. If someone got a code snippet, can you please share?

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• Having a white space issue with scala, I think?

  - by Uruhara747

  I'm trying to write a script to make generating Lift projects quicker but I believe i'm running into a white space issue. val strLiftGen = "mvn archetype:generate -U-DarchetypeGroupId=net.liftweb\ -DarchetypeArtifactId=lift-archetype-blank\ -DarchetypeVersion=1.0\ -DremoteRepositories=http://scala-tools.org/repo-releases-DgroupId=" + args(0)"-DartifactId=" + args(1)"-Dversion=1.0-SNAPSHOT */" Anyone care to hit the newb with the stick of wisdom and tell me a smart way of handling a long string like this?

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• Matplotlib digit grouping (decimal separator)

  - by Jrop

  Basically, when generating plots with matplotlib, The scale on the y-axis goes into the millions. How do I turn on digit grouping (i.e. so that 1000000 displays as 1,000,000) or turn on the decimal separator?

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• csv file enclosed with double quotes not stripping quotes

  - by sjw

  I am generating a csv download from my web server and to be safe, I have enclosed each field with double quotes. i.e. "Field1","Field2","Field3","Field4" "row1_field1","row1_field2","row1_field3","row1_field4" "row2_field1","row2_field2","row2_field3","row2_field4" The problem is that when the file is opened in Excel, it does not strip all quotes... Therefore, some fields are appearing as: row1_field1 whereas others are appearing as "row1_field2" What am I not doing to ensure that excel strips all surrounding quotes?

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• Getting EL variable properties in eclipse

  - by wheresrhys

  I'm using Eclipse/Spring source to edit JSP tags and EL. If I want to check what all the properties of a variable are is there a way to do this? Or even find out which file is generating the variable that's passed in. I'm thinking something along the lines of firebug for Javascript, where you can select an object and drill-down to get it's properties.

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• Rdlc Report in dotnet

  - by muthukumarm

  Hi I am generating rdlc report in dotnet2.0 c#. My doubt is i want to freeze the Table header in the rdlc report.Since my table data is more , i need this option. Could anyone help me in this... Urgent...

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• Need code to generate colorful unicorns.

  - by The Rook

  I am looking for code to automatically generate lots of colorful unicorns. I would also like to randomly generate clouds and rainbows in the image. How does one go about automatically generating meaningful images?

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• How to measure the pixel width of the string drawed over Drawing.Bitmap in .NET?

  - by Nitai Bezerra

  I am generating a png image that contains a text dinamically written. I need to create the bitmap with the minimum width for file size reasons.

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• AudioQueue in-memory playback example

  - by Jonesy

  Does anybody know of any examples using AudioQueue that play from an in-memory source? All the examples I can find play from files (using AudioFileReadPackets) but in my particular case I am generating the data myself in realtime so ideally, I want to enqueue the data myself rather than sucking it out of a file using the callback. Any help much appreciated.

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• "Debug certificate expired" error in eclipse android plugins

  - by hap497

  I am using eclipse android plugins to build a project, But i am getting this error in the console window: [2010-02-03 10:31:14 - androidVNC]Error generating final archive: Debug certificate expired on 1/30/10 2:35 PM! Does anyone know how to fix it? Thank you.

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• How to rename model

  - by samuil

  I made a mistake early in development, and named one of my models with plural noun (Users instead of User). Is there an easy way to rename it and corresponding controller (similar to generating it with script/generate way)?

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• Set Action Controller name for Zend_Tool create controller

  - by Cobby

  Hi All, All my controllers use a custom Action Controller class, is there anyway to set the action controller class it uses when generating the the controller code? Or would be even better if I could set it up to map the action controller class to use based on the module the class is being created under. Cheers.

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• How can I override an inline style with an external css?

  - by Aaron Fischer

  I am trying to restyle a table generated by an asp.net gridview control. The problem I have is that the gridview is generating an inline styles. How do I make the browser render my css rather then the html style attribute?

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• Boxplot in R showing the mean

  - by mortalitysequence

  Does anybody know of a way of generating a boxplot in R with a line (or another symbol) in the value corresponding to the mean? Thank you!

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• Provable planarity of flowcharts

  - by Nikolaos Kavvadias

  Hi all I have a question: is there any reference (e.g. paper) with a proof of the planarity of flowchart layouts? Can anyone suggest an algorithm for generating flowchart (planar) layouts? I know that there are some code-to-flowchart tools out there, but i'm unaware of their internals. Thanks in advance -kavi

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• PHP to Mesh 2 PDF'S Together or not?

  - by Justin

  I have an already pre-designed PDF, and I would like to fill the PDF with some database information. So I'm curious if I should save the PDF into JPG's and render them out with the data on top of the image and re-create a PDF. Or is there a way to use the PDF already, and print data into the PDF that is already made? I am trying to figure out the best solution to generating this type of PDF. All thoughts would be greatly appreciated!

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• Generate all unique substrings for given string

  - by Yuval A

  Given a string s, what is the fastest method to generate a set of all its unique substrings? Example: for str = "aba" we would get substrs={"a", "b", "ab", "ba", "aba"}. The naive algorithm would be to traverse the entire string generating substrings in length 1..n in each iteration, yielding an O(n^2) upper bound. Is a better bound possible? (this is technically homework, so pointers-only are welcome as well)

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• Mathematical attack on the Digital Signature Algorithm

  - by drelihan

  Does anybody know the mathematics behind an attack on DSA where modulus p has p-1 made up of only small factors. In reality, this would not happen as the key generator would guarantee that this is not so. There is much information on the web on generating good input paramters for DSA so that it is hard to crack but no information on how you find X if modulus p has p-1 made up of only small factors.

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• iPhone SDK: How to generate a random time of day

  - by bigdave

  Hello all, I am having some problems trying to figure out the best way of generating a random time of day. For instance, if I want to choose a random time between the hours of 9am and 5pm, what would be the best way with the least amount of overhead on the device? I guess I need someone to point me in the right direction. Thanks!

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• Specificying a Page directive attribute on an NHaml page

  - by ManiacZX

  I am working on an MVC site using NHaml for the view engine. I have a page that needs to submit HTML code as a form value and am getting the System.Web.HttpRequestValidationException thrown at me. I want to specify the <%@ Page validateRequest="false" % so that this page will allow this data to be submitted but am unsure on how to do this with NHaml generating the pages.

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• Invalid Jaclplus pro key

  - by Aruna

  Hi , i have registered in byostech.com and received the key for the Jaclplus cpmponent1.5.11 and were using that.But now we have moved the content to another url and the key becomes invalid. I am not aware of how to generate a new key. Please help me in providing guidelines in generating the key

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• Does IE 7 support the content pseudo-class?

  - by zac

  I am generating pipes in my list using pseudo-classes and it works fine except they are not being rendered in IE 7. The code looks like: .brandLinks a:after { margin: 0 4px; content: "|"; } .brandLinks a:last-child:after { content: " " } Is this just something IE 7 does not do or is my code wonky?

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