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• HTML encode UTF-8 string gets mangled into latin1

  - by Ken Mayer

  I'm parsing my nginx logs, and I want to discover some details from the HTTP_REFERER string, for example, the query string used to find the web site. One user typed in "México" which gets encoded in the log as "query=M%E9xico". Passing this through Rack::Utils.parse_query('query=M%E9xico') you get a hash, {"query" = "M?xico"} When you to stuff "M?exico" into Postgres (but not the more forgiving SQLite), it pukes because the string isn't proper UTF-8. Looking at http://rack.rubyforge.org/doc/Rack/Utils.html#M000324, unescape is packing a hex string. How can I convert the string back to UTF-8, or can I get parse_query to return UTF-8 in the first place.

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• PostSharp , PDB Debugging and Referenced Assemblies ...

  - by Anil Bisnoi

  When using PostSharp with a Referenced Assembly with proper PDB info( checked with chkmatch), it seems strange that the debug info gets lost by VStudio build and post compile process and I get the following error by using chkmatch to compare the assembly after the vstudio build. Error: Debug information not found in the executable. So it doesn't step into for debugging into this assembly. Does Post Sharp properly writes back the Assemblies without destroying the PDB location offset info as I saw no valid offset info in the written back into DLL by PostSharp using Hex Editor and What's the workaround for this ? Thx Anil Bisnoi

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• processing: convert int to byte

  - by inspectorG4dget

  Hello SO, I'm trying to convert an int into a byte in Processing 1.0.9. This is the snippet of code that I have been working with: byte xByte = byte(mouseX); byte yByte = byte(mouseY); byte setFirst = byte(128); byte resetFirst = byte(127); xByte = xByte | setFirst; yByte = yByte >> 1; port.write(xByte); port.write(yByte); According to the Processing API, this should work, but I keep getting an error at xByte = xByte | setFirst; that says: cannot convert from int to byte I have tried converting 128 and 127 to they respective hex values (0x80 and 0x7F), but that didn't work either. I have tried everything mentioned in the API as well as some other blogs, but I feel like I'm missing something very trivial. I would appreciate any help. Thank you.

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• teaching my self Z/OS assembler?

  - by Jared

  'I've interned at a company that does a lot of mainframe work. Most of my mainframe experience has been using Java and Unix System Services. I've had some experience with the ISPF interface and C but none with assembler. I’m graduating shortly and will be taking an independent study my last semester. I’d like to stick with the mainframe and was wondering what resources could teach me mainframe assembler? Note I don’t have experience writing assembler for any platform but do understand binary, hex, and have a theoretical understanding of registers.

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• Data structure for Settlers of Catan map?

  - by templatetypedef

  Hello all- A while back someone asked me if I knew of a nice way to encode the information for the game Settlers of Catan. This would require storing a hexagonal grid in a way where each hex can have data associated with it. More importantly, though, I would need some way of efficiently looking up vertices and edges on the sides of these hexagons, since that's where all the action is. My question is this: is there a good, simple data structure for storing a hexagonal grid while allowing for fast lookup of hexagons, edges between hexagons, and vertices at the intersections of hexagons? I know that general structures like a winged-edge or quad-edge could do this, but that seems like massive overkill. Thanks!

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• How does a debug build make reverse engineering easy?

  - by danny

  Some answer here stated that debug info would make it easier to reverse engineer the software. When I use Visual C++ and distribute an executable with debugging information but without other files (.pdb), will it contain any interesting things? I looked to the executable with a hex editor and found nothing like symbol names, for now I assume the .exe file just links to information in the .pdb files, right? Do you know whether it contains variable names? function/member names? line numbers? anything interesting? Thanks!

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• finding a string of random characters (with possible errors) within a large string of random charact

  - by mike

  I am trying to search a large string w/o spaces for a smaller string of characters. using regex I can easily find perfect matches but I can't figure out how to find partial matches. by partial matches i mean one or two extra characters in the string or one or two characters that have been changed, or one of each. the first and last characters will always match though. this would be similar to a spell checker but there are no spaces and the strings dont contain actual words, just random hex digits. i figured a way to find the string if there are no extra characters using indexOf(string.charAt(0)) and indexOf(charAt(string.length()-1) and looping through the characters between the two indexes. but this can be problematic when dealing with randomized characters because of the possibility of finding the first and last characters at the correct spacing but none of the middle characters matching. i've been scratching my head for hours on this issue. any ideas?

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• convert integer to a string in a given numeric base in python

  - by Mark Borgerding

  Python allows easy creation of an integer from a string of a given base via int(str,base). I want to perform the inverse: creation of a string from an integer. i.e. I want some function int2base(num,base) such that: int( int2base( X , BASE ) , BASE ) == X the function name/argument order is unimportant For any number X and base BASE that int() will accept. This is an easy function to write -- in fact easier than describing it in this question -- however, I feel like I must be missing something. I know about the functions bin,oct,hex; but I cannot use them for a few reasons: Those functions are not available on older versions of python with which I need compatibility (2.2) I want a general solution that can be called the same way for different bases I want to allow bases other than 2,8,16 Related Python elegant inverse function of int(string,base) Interger to base-x system using recursion in python Base 62 conversion in Python How to convert an integer to the shortest url-safe string in Python?

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• PBKDF2-HMAC-SHA1

  - by Jason

  To generate a valid pairwise master key for a WPA2 network a router uses the PBKDF2-HMAC-SHA1 algorithm. I understand that the sha1 function is performed 4096 times to derive the PMK, however I have two questions about the process. Excuse the pseudo code. 1) How is the input to the first instance of the SHA1 function formatted? SHA1("network_name"+"network_name_length"+"network_password") Is it formatted in that order, is it the hex value of the network name, length and password or straight ASCII? Then from what I gather the 160 bit digest received is fed straight into another round of hashing without any additional salting. Like this: SHA1("160bit digest from last round of hashing") Rise and repeat. 2) Once this occurs 4096 times 256 bits of the output is used as the pairwise master key. What I don't understand is that if SHA1 produces 160bit output, how does the algorithm arrive at the 256bits required for a key? Thanks for the help.

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• FileUtils.mv adding linebreaks in Windows

  - by Lowgain

  I am streaming wav data from a flash application. If I get the data and do the following: f = File.open('c:/test.wav') f << wav_data.pack('c'*wav_data.length) f.close The wav file works perfectly. If I do this: f = Tempfile.new('test.wav') f << wav_data.pack('c'*wav_data.length) f.close FileUtils.mv(f.path, 'c:/') The file is there, but sounds all garbled. Checking in a hex editor shows that everywhere the working file had an 0A (or \n), the garbled version had 0D0A (or \r\n) I am using this in conjuction with rails+paperclip, and am going to be using a combination of Heroku and S3 for the live app, so I am hoping this problem will solve itself, but I'd like to get this working on my local machine for the time being. Does anybody know of any reason FileUtils.mv would be doing this, and if there is a way to change its behaviour?

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• Decoding a compressed short string; uncertain on compression used - Updated

  - by James

  Hi, I have a program that is compressing a string in an unknown way. I know a few inputs and the output produced, but I am not sure what is being used to compress the string. Here are my examples. (just 38 x a, no spaces or anything else) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Out: "026900211AA63000026900"   (just 32 x a) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Out: "0209001c1aa7a000020900" (31 x a, then 1 b) In: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab" Out: "0209000177c553c000020900" (31 x b, then 1 a) In: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbba" Out: "0209001e7754f38000020900" In: "Hey wot u doing 2day u wanna do something" Out: "02990011C7C62E78CE6B8E3ACD83E81B37C5C5A6B9D1E1B06963DB5E71155C1000029900" (same as previous string, but with a space at the end) In: "Hey wot u doing 2day u wanna do something " Out: "02A90012C7718B9E339AE2EB360FA02CDF17177A674786DF4B1EDAF388AAE08000000002A90000" The only definite thing I can see so far is digit 2 and 3 are the amount of characters (hex value), ie first one is 26 = 38 Also the first 6 digits are repeated at the end Any help / advice would be great, thanks!

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• How do I get source file information with dumpbin /symbols when compiling with VS 2005?

  - by Thomas Dartsch

  I have a tool which uses the output of dumpbin /symbols to do some dependency analysis with our C/C++ libraries. When we compiled the libs with VS 6.0, the dumpbin COFF SYMBOL TABLE contained entries like 000 00000008 DEBUG notype Filename | .file x:\mydir\mysource.c allowing me to get the relationship between sources and defined/used symbols, which is essential for my tool. When we compile with VS 2005, these entries are missing. When I look at the libs with a hex editor, it seems that there is no filename information at all included in the binary files, so it seems not to be a dumbin problem but is compilation related. So I'm looking for a way to get the Filename entries back into my libraries when compiling with VS 2005.

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• BindingList projection wrapper

  - by Groo

  Is there a simple way to create a BindingList wrapper (with projection), which would update as the original list updates? For example, let's say I have a mutable list of numbers, and I want to represent them as hex strings in a ComboBox. Using this wrapper I could do something like this: BindingList<int> numbers = data.GetNumbers(); comboBox.DataSource = Project(numbers, i => string.Format("{0:x}", i)); I could wrap the list into a new BindingList, handle all source events, update the list and fire these events again, but I feel that there is a simpler way already.

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• Modify cmd.exe properties using the command prompt

  - by CodexArcanum

  Isn't that nicely recursive? I've got a portable command prompt on my external drive, and it has a nice .bat file to configure some initial settings, but I'd like more! Here's what I know how to set from .bat: Colors = (color XY) where x and y are hex digits for the predefined colors Prompt = (prompt $p$g) sets the prompt to "C:\etc\etc " the default prompt Title = (title "text") sets the window title to "text" Screen Size = (mode con: cols=XX lines=YY) sets the columns and lines size of the window Path = (SET PATH=%~d0\bin;%PATH%) sets up local path to my tools and appends the computer's path So that's all great. But there are a few settings I can't seem to set from the bat. Like, how would I set these up wihtout using the Properties dialogue: Buffer = not screen size, but the buffer Options like quick edit mode and autocomplete Popup colors Font. And can you use a font on the portable drive, or must it be installed to work? Command history options

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• find the colour name from a hexadecimal colour code

  - by sree01

  Hi , i want to find the name of a colour from the hexadecimal colour code. When i get a hex colour code i want to find the most matching colour name. for example for the code #c06040 , how to find out if it is a shade of brown, blue or yellow ?. so that i can find the colour of an object in the image without human intervention. Is there any relation between the hexadecimal code of the shades of a colour? please give some sample code if there is any.

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• Outlook 2003 Add-In Setup Project with COM DLL Deployment Problem

  - by Malkier

  Hi, I developed an Outlook 2003 add-in which uses the com dll redemption. I created a visual studio 2008 setup project, added a custom action to run "caspol.exe -machine -addgroup 1 -strong -hex [key] -noname -noversion FullTrust -n \"Name\" -description \"desc\" and moved the registry keys under software to HKLM as described in http://msdn.microsoft.com/en-us/library/cc136646.aspx#AutoDeployVSTOse_InstallingtheAddinforAllUsers to ensure all-users compatibility. I included the redemption.dll in the setup with vsdrfCOMSelfReg (vsdrfCOM throwed an error). My problem is: When installing the setup on a test machine under an admin account, it runs fine under all users, however when we use the company wide software deployment which runs under a system account the setup executes but the add-in wont load. If I repair the installation with an admin account again it loads just fine. Shouldn't a system account have the required permissions to install all of the components? What options do I have? Thanks for any suggestions.

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• Three Silverlight 4 issues

  - by Muhammad Jamal Shaikh

  Silverlight version : 4 Silverlight patter :MVVM Visual Studio template :Silverlight navigation application How do I block main navigation on (mainpage.xaml) as in any silverlight navigation application and block page's controls ( i.e whichever page is it in ) during async webservice calls? Any best practices? How do I deal with the browser's forward and backward buttons, specially during async calls? How do I deal with dialogs on the views ( e.g when using a childwindow to select a color). How should the color's picker control hex be communicated to the viewmodel?

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• Python.expat can't parse XML file with bad symbols. How to go around?

  - by culebrón

  I'm trying to parse an XML file with expat, and here's the line where I get bad token exception: <tag k="name" v="???????????????????????????????????????????????????????????????????" /> xml.parsers.expat.ExpatError: not well-formed (invalid token): line 610127, column 37 The symbols in hex look like: \xd1? Seems like someone wrote this string (Russian alfabet) hitting backspace a few times. I set parser.returns_unicode = True, but this didn't help. The 1st line is <?xml version="1.0" encoding="UTF-8"?>. I work with a bz2 file. (bz2.BZ2File) How can I parse the file?

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• xml with special character, encoding utf-8

  - by Sergio Morieca

  I have a few simple questions, because I got confused reading all difference responses. 1) If I have an xml with prolog: and I'm going to unmarshall it with Java (for example: JaXB). I suppose, that I can't put CROSS OF LORRAINE (http://www.fileformat.info/info/unicode/char/2628/index.htm) inside, but I can put "\u2628", correct? 2) I've also heard that UTF-8 doesn't contain it, but anything in Unicode can be saved with encoding UTF-8 (or UTF-16), and here is an example from this page: UTF-8 (hex) 0xE2 0x98 0xA8 (e298a8) Is my reasoning correct? Can I use this form and put it in the xml with utf-8 encoding?

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• What language is to binary, as Perl is to text?

  - by ehdr

  I am looking for a scripting (or higher level programming) language (or e.g. modules for Python or similar languages) for effortlessly analyzing and manipulating binary data in files (e.g. core dumps), much like Perl allows manipulating text files very smoothly. Things I want to do include presenting arbitrary chunks of the data in various forms (binary, decimal, hex), convert data from one endianess to another, etc. That is, things you normally would use C or assembly for, but I'm looking for a language which allows for writing tiny pieces of code for highly specific, one-time purposes very quickly. Any suggestions?

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• Managing of shared resources between classes?

  - by Axarydax

  Imagine that I have a several Viewer component that are used for displaying text and they have few modes that user can switch (different font presets for viewing text/binary/hex). What would be the best approach for managing shared objects - for example fonts, find dialog, etc? I figured that static class with lazily initialized objects would be OK, but this might be the wrong idea. static class ViewerStatic { private static Font monospaceFont; public static Font MonospaceFont { get { if (monospaceFont == null) //TODO read font settings from configuration monospaceFont = new Font(FontFamily.GenericMonospace, 9, FontStyle.Bold); return monospaceFont; } } private static Font sansFont; public static Font SansFont { get { if (sansFont == null) //TODO read font settings from configuration sansFont = new Font(FontFamily.GenericSansSerif, 9, FontStyle.Bold); return sansFont; } } }

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• How to customize the ColorPicker class in Adobe flex3.0?

  - by Ankur Sharma

  i have to make the colorpiker tool of flex, to be a customized one, i beleive you have seen the color picker tool of flex, when you click on the colorpicker, a swatch panel gets open, right?? now in that swatch, there are three compoenents, one is thw colorbox(on top left), beside right to this is the text field holding the hex code of the color and below these two tools, is the colors present in the small rectangles, now my need is this, i want to add three more buttons on the top empty space after textfield, so that structure of the colors pciker looks like this colorbox | textfield | button1 | button2 | button3 color rectangles, showing all default colors i beleive u understood, what i meant here, so plzz help me out in making a custom colorpciker class, thanx Namaste

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• Piping SoX in Python - subprocess alternative?

  - by Cochise Ruhulessin

  I use SoX in an application. The application uses it to apply various operations on audiofiles, such as trimming. This works fine: from subprocess import Popen, PIPE kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} pipe = Popen(['sox','-t','mp3','-', 'test.mp3','trim','0','15'], **kwargs) output, errors = pipe.communicate(input=open('test.mp3','rb').read()) if errors: raise RuntimeError(errors) This will cause problems on large files hower, since read() loads the complete file to memory; which is slow and may cause the pipes' buffer to overflow. A workaround exists: from subprocess import Popen, PIPE import tempfile import uuid import shutil import os kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} tmp = os.path.join(tempfile.gettempdir(), uuid.uuid1().hex + '.mp3') pipe = Popen(['sox','test.mp3', tmp,'trim','0','15'], **kwargs) output, errors = pipe.communicate() if errors: raise RuntimeError(errors) shutil.copy2(tmp, 'test.mp3') os.remove(tmp) So the question stands as follows: Are there any alternatives to this approach, aside from writing a Python extension to the Sox C API?

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• Any best practices with feedback colours?

  - by alex

  I have a few that I think are correct. These are background colours for messages. ERROR: red; INFO: blue; SUCCESS: green; NOT IMPORTANT INFO: yellow Have I got the blue and yellow around the wrong way? Any hex values that are a de facto standard for these? I am curious considering web development, but I think the answers will be agnostic. Here is an interesting thought (I'm sure I've read about it in an article). What colours would the errors be on Target's website, considering all their branding is red?

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• IPv6 parsing in C

  - by The Stig

  I wanted to know how i can parse an IPv6 address in 'C' and convert it to a 128 bit value? So a hex address like 1:22:333:aaaa:b:c:d:e:f needs to be converted to its 128 bit equivalent binary. The problem is the IP address could be of the type ::2 and its variant since they are valid IPv6 address. The input is from the keyboard and hence is in ASCII format. Any suggestions or pointers will be appreciated. Thanks!!!

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