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  • Des chercheurs en sécurité découvrent Dexter, un malware qui cible essentiellement les systèmes de point de vente

    Des chercheurs en sécurité découvrent Dexter un malware qui cible essentiellement les systèmes de point de vente Les pirates pour voler les données des cartes de crédit ont trouvé un moyen d'insérer un malware directement dans les systèmes de point de vente (POS). La firme de sécurité Seculert vient d'identifier un programme malveillant spécialement conçu pour attaquer les systèmes de point de vente. Le logiciel malveillant baptisé Dexter, aurait déjà infecté des systèmes POS dans près de 40 pays au cours des deux derniers mois. Les pays anglo-saxons semblent être les cibles favorites du malware, avec 30% d'attaque aux USA, 19% en Grande-Bretagne et 9% au Canada. L...

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  • Read half precision float (float16 IEEE 754r) binary data in matlab

    - by Michael
    you have been a great help last time, i hope you can give me some advise this time, too. I read a binary file into matlab with bit16 (format = bitn) and i get a string of ones and zeros. bin = '1 00011 1111111111' (16 bits: 1. sign, 2-6. exponent, 7-16. mantissa) According to ftp://www.fox-toolkit.org/pub/fasthalffloatconversion.pdf it can be 'converted' like out = (-1)^bin(1) * 2^(bin(2:6)-15) * 1.bin(7:16) [are exponent and mantissa still binary?] Can someone help me out and tell me how to deal with the 'eeeee' and '1.mmmmmmmmmm' as mentioned in the pdf, please. Thanks a lot! Michael

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  • dividing double by double gives weird results - Java

    - by Aly
    Hi, I am trying to do the following 33.33333333333333/100.0 to get 0.333333333333333 however when I run System.out.println(33.33333333333333/100.0); I get 0.33333333333333326 as the output, similarly when I run System.out.println(33.33333333333333/1000.0); I get 0.033333333333333326 as the output. Does anyone know why, and how I can get the correct value (without loss of decimal places). Thanks

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  • MIPS (or SPIM): Loading floating point numbers...

    - by James
    Hey hey, I am working on a little mini compiler while trying to learn some MIPS here. Here's my issue: MIPS has an instruction li (load immediate) which would work like this li $5,100 which would load 100 into register 5. However, I need to load floats into registers right now and am struggling with figuring out a way to do it...since li $5,2.5 does not work. Anyone have any advice? I am working in C, I was thinking I could somehow get the integer representation of the float I am working with (i.e. so the floats binary representation == the ints binary representation) then load the "integer" into the register and treat it like a float from then on. Maybe its too late but Im stuck right now.

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  • Controlling FPU behavior in an OpenMP program?

    - by STingRaySC
    I have a large C++ program that modifies the FPU control word (using _controlfp()). It unmasks some FPU exceptions and installs a SEHTranslator to produce typed C++ exceptions. I am using VC++ 9.0. I would like to use OpenMP (v.2.0) to parallelize some of our computational loops. I've already successfully applied it to one, but the numerical results are slightly different (though I understand it could also be due to calculations being performed in a different order). I'm assuming this is because the FPU state is thread-specific. Is there some way to have the OpenMP threads inherit that state from the master thread? Or is there some way to specify using OpenMP that new threads execute a particular function that sets up the correct state? What is the idiomatic way to deal with this situation?

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  • Insert some data at later point once serialization(binary serialization) is done for a class

    - by coolcake
    My application is written in C# and I am a newbie to C#. I am facing with a problem during serialization. The problem is as follows. There are many classes in my project and when serialization is called on one of the main class object it serializes itself and during this process many of the member objects are also get serialized. This whole serialization is done in to a file with extension say ".bin". This bin file size should be of size max 20MB. In this process of serialization one of my other class also gets serialized to a stream, this class is having a big array. The size of this array or list can be of 80 MB or more. So during serialization i have serialize all the objects other than this array and depending upon the size left in the 20MB I need to add in between the serialization the number of array elements which can fit in the remaining memory. For the other array elements left out I have to create a similar kind of .bin file with all the objects serialized and in between need to insert the number of array elements that can fit there. The main problem here is the array elements get inserted at runtime and this list keeps on increasing. So i should be creating .bin files continuously until my application runs. Any ideas how can i implement a solution for this problem? Thanks in Advance.

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  • Detecting wether a point is inside or outside of a raphael.js shape

    - by betamax
    I have a raphael.js shape which I am plotting circle's on top of. I only want a circle to appear if the circle does not go off the boundary of the shape it is being plotted on to. To make this more clear, here is an example of what I do not want to happen: I want the circles outside of the grey area not to appear. How would I detect wether a circle is inside or outside of the grey shape?

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  • serverside controls vs html controls from AJAX point of view

    - by devmania
    hi, i know this question have been mentioned alot here but mine is a little more updated, now with ASP.net 4 and new Ajax client templating plus JASON services. so if i got all these new capabilities will i really need server side controls as long as i can bind on client side, create data-views on client side heck i can even use data-context and apply CRUD operations on clients side. so i actually i wont need button_click server side event or what so ever... i am asking this because i own some commercial Controls like Telerik and Component art and they both offer client side operations ow but still i am confused as to my knowledge creating these controls will still have to go through Page Life cycle please advise me.

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  • CUDA: accumulate data into a large histogram of floats

    - by shoosh
    I'm trying to think of a way to implement the following algorithm using CUDA: Working on a large volume of voxels, for each voxel I calculate an index i and a value c. after the calculation I need to perform histogram[i] += c c is a float value and the histogram can have up to 15,000 bins. I'm looking for a way to implement this efficiently using CUDA. The first obvious problem is that with compute capabilities 1.3 which is what I'm using I can't even do an atomicAdd() of floats so how can I accumulate anything reliably? This example by nVidia does something somewhat simpler. The histograms are saved in the shared memory (which I can't do due to its size) and it only accumulates integers. Can this approach be generalized to my case?

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  • WPF DataGridTextColumn Can't type point for float data

    - by Alvin
    I had a WPF DataGrid and use DataGridTextColumn Binding to a Collection. The items in Collection had some float property. When my program launched, I modify the value of float property in DataGrid, if I type a integer value, it works well. But if I type char . for a float value, char . can't be typed. I had to type all the numbers first, and then jump to the . position to type char . to finish my input. So how can I type . in my situation? Thanks.

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  • Starting point for learning CAD/CAE file formats?

    - by Escader
    We are developing some stress and strain analysis software at university. Now it's time to move from rectangles and boxes and spheres to some real models. But I still have little idea where to start. In our software we are going to build mesh and then make calculations, but how do I import solid bodies from CAD/CAE software? 1) How CAD/CAE models are organised? How solid bodies are represented? What are the possibilities of DWG, DXF, IGES, STEP formats? There is e.g. a complete DXF reference, but it's too difficult for me to understand without knowing basic concepts. 2) Are there C++ libraries to import solid bodies from CAD/CAE file formats? Won't it be too difficult to build a complete model to be able to import comprehensive file?

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  • AudioQueue recording as float

    - by niklassaers
    Hi guys, I would like to have the result from my recording as a float in the range [0.0, 1.0], alternatively [-1.0, 1.0] because of a bit of math I want to do on it. When I set my recordingformat to be in float, like this: mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsFloat; I get: Error: AudioQueueNewInput failed ('fmt?') Does this mean the hardware doesn't support recording to floats? If not, how do I set it to record in floats? If so, are there any processor-friendly ways I can convert a signed integer array to a float array? Cheers Nik

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  • Algorithm putting point into square with maximal minimum distance

    - by Mikulas Dite
    I'm stuck on this: Have a square. Put n points into this square so the minimal distance (not necessary the average distance) is the highest possible. I'm looking for an algorithm which would be able to generate the coordinates of all points given the count of them. Example results for n=4;5;6: Please don't mention computing-power based stuff such as trying a lot of combination and then nitpicking the right one and similar ideas.

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  • sprintf() to truncate and not round a float to x decimal places?

    - by jerrygarciuh
    Hi folks, When calculating a golf handicap differential you are supposed to truncate the answer to 1 decimal place without rounding. No idea why but... I know how to do this using TRUNCATE() in mySQL SELECT TRUNCATE( 2.365, 1 ); // outputs 2.3 but I was wondering if sprintf() could do this? The only way I know to work with decimal places in a float is ... echo sprintf("%.1f", 2.365); // outputs 2.4 TIA JG

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  • Convert ieee 754 float to hex with c - printf

    - by Michael
    Ideally the following code would take a float in IEEE 754 representation and convert it into hexadecimal void convert() //gets the float input from user and turns it into hexadecimal { float f; printf("Enter float: "); scanf("%f", &f); printf("hex is %x", f); } I'm not too sure what's going wrong. It's converting the number into a hexadecimal number, but a very wrong one. 123.1443 gives 40000000 43.3 gives 60000000 8 gives 0 so it's doing something, I'm just not too sure what. Help would be appreciated

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  • I'm working on Peano Axioms in Agda and I've hit a bit of a sticking point

    - by Schroedinger
    PA6 : ?{m n} -> m = n -> n = m is the axiom I am trying to solve and support, I've tried using a cong (from the core library) but am having troubles with the cong constructor PA6 = cong gets me nowhere, I know for cong I am required to supply a refl for equality and a type, but I'm, not sure what type I'm supposed to supply. Ideas? This is for a small assignment at University, so I'd rather someone demonstrate what I've missed rather than write the acutual answer, but I'd appreciate any degree of support.

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  • Heuristic to identify if a series of 4 bytes chunks of data are integers or floats

    - by flint
    What's the best heuristic I can use to identify whether a chunk of X 4-bytes are integers or floats? A human can do this easily, but I wanted to do it programmatically. I realize that since every combination of bits will result in a valid integer and (almost?) all of them will also result in a valid float, there is no way to know for sure. But I still would like to identify the most likely candidate (which will virtually always be correct; or at least, a human can do it). For example, let's take a series of 4-bytes raw data and print them as integers first and then as floats: 1 1.4013e-45 10 1.4013e-44 44 6.16571e-44 5000 7.00649e-42 1024 1.43493e-42 0 0 0 0 -5 -nan 11 1.54143e-44 Obviously they will be integers. Now, another example: 1065353216 1 1084227584 5 1085276160 5.5 1068149391 1.33333 1083179008 4.5 1120403456 100 0 0 -1110651699 -0.1 1195593728 50000 These will obviously be floats. PS: I'm using C++ but you can answer in any language, pseudo code or just in english.

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  • SQL Query to retrieve highest item up to a point in a group

    - by James
    The best way of describing this is I have a table of people with their names and ages. Assume that people with the same surname are from the same family. I need a query in oracle which will retrieve a list of the oldest person in each family, but not older than a certain age. Table: person name surname age =============================== James Smith 23 Sarah Powell 17 Barry Smith 31 Mark Smith 35 Mary Smith 18 Bob Powell 30 How do I retrieve the oldest person in each family under 30? Results I'm after name surname age =============================== James Smith 23 Sarah Powell 17

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  • htaccess not called when the url point to an existing folder

    - by Eldad
    Hi, I'm running zend server on windows 7. I'm using the htaccess from jooml: Options +FollowSymLinks RewriteEngine On RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR] RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR] RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR] RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR] RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2}) RewriteRule ^(.*)$ index.php [F,L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} !^/index.php RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC] RewriteRule (.*) index.php RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L] when I'm calling this url: http://localhost/ABC/ the data is been redirect to index.php but if I'm creating the folder ABC the server is showing the ABC folder content and not redirecting the data back to index.php. how can I prevent that, I want all the calls data to be directed into index.php? Thanks

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