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• Generating a salt in PHP

  - by qster

  What's the best way to generate a cryptographically secure 32 bytes salt in PHP, without depending on libraries seldom included in typical PHP installations? After some googling I discovered that mt_rand is not considered secure enough, but I haven't found a suggestion for a replacement. One article suggested reading from /dev/random but not only…

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• Lots of questions about file I/O (reading/writing message strings)

  - by Nazgulled

  Hi, For this university project I'm doing (for which I've made a couple of posts in the past), which is some sort of social network, it's required the ability for the users to exchange messages. At first, I designed my data structures to hold ALL messages in a linked list, limiting the message size to 256 chars. However, I think my instructors…

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• Missing processor/memory counters in the Windows XP Performance Monitor application (perfmon)

  - by Jader Dias

  Perfmon is a Windows utility that helps the developer to find bottlenecks in his applications, by measuring system counters. I was reading a perfmon tutorial and from this list of essential counters I have found the following ones on my machine: PhysicalDisk\Bytes/sec_Total Network Interface\Bytes Total/Sec\nic name But I haven't found the…

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• Float PPM image file format?

  - by Luca

  I've found a PPM image with the header starting with PF. The resolution number is stored in floating point (-1.000). No comments are inserted to get how it was produced. From the resolution, each pixel is composed by 12 bytes (4 bytes per component)... I suppose they are float or integer numbers. The problem is that I cannot get a clear…

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• How to calculate Least Signficant Byte in Ruby

  - by Seth Archer

  I'm sending a byte array to a piece of hardware. The first 7 bytes contain data and the 8th byte is a checksum. The 8th byte is the Least Significant Byte of the sum of the first 7 bytes. Examples that include the correct checksum. The last byte of each of these is the checksum 200-30-7-5-1-2-0-245 42-0-0-1-176-0-148-39 …

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• Install APC on Windows

  - by jiewmeng

  how can i install APC on Windows? i am using PHP 5.3, Windows 7 x64 i used pecl install apc i got C:\PHPpecl install apc downloading APC-3.0.19.tgz ... Starting to download APC-3.0.19.tgz (115,735 bytes) ............done: 115,735 bytes 47 source files, building WARNING: php_bin c:\php\php.exe appears to…

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• char pointers & integer pointers (++)

  - by benjamin button

  i have two pointers, char *str1; int *str2; if i look at the size of both the pointers lets assume str1=4 bytes str2=4 bytes str1++ will increment by 1 byte but if str2++ will increment 4 byte could anybody tell e the concept behind this?

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• Fast Remote PHP Technique To Detect Image 404

  - by Volomike

  What PHP script technique runs the fastest in detecting if a remote image does not exist before I include the image? I mean, I don't want to download all the bytes of the remote image -- just enough to detect if it exists. And while on the subject but with just a slight deviation, I'd like to download just enough bytes to…

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• Reading Binary file in C

  - by darkie15

  Hi All, I am having following issue with reading binary file in C. I have read the first 8 bytes of a binary file. Now I need to start reading from the 9th byte. Following is the code: fseek(inputFile, 2*sizeof(int), SEEK_SET); However, when I print the contents of the array where I store the retrieved values, it…

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• bit manipulation in java

  - by sarav

  I have a fragment of bytes in a byte[]. The total size of the array is 4 and I want to convert this into a positive long number. For example if the byte array is having four bytes 101, 110, 10, 1 then i want to get the long number represented by binary sequence 00000000 00000000 00000000 00000000 00000101 00000110…

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• To use AES with 256 bits in inbuild java 1.4 api.

  - by sahil garg

  I am able to encrypt with AES 128 but with more key length it fails. code using AES 128 is as below. import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; import java.io.*; /** * This program generates a AES key, retrieves its raw bytes, and * then reinstantiates a AES key from the key…

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• XCode and Instruments for memory leaks

  - by coure06

  I have tested my iphone app using XCode and instrument. I am watching the memory allocation tables, its showing me that every things is increasing i.e Bytes, Live Bytes and so on. What does it means? Am i not deallocating the objects? Can i find which objects are not deallocating using instruments?

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• JPEG-2000: Can I dynamically resize an image without resampling?

  - by Mark Harrison

  One of the nice features of JPEG 2000 is that it's easy to downres an image -- just feed out fewer bytes. Is there a similar way to scale the image, such that I could send a thumbnail using bytes in the full-size file, without resampling?

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• How to decode an encoded string?

  - by Madan Mohan

  While decoding,I am getting NSData bytes by decoding a string.I am converting NSData bytes as string then I am getting the following out put. -(void)decodeAction:(NSString*)str { NSData *data=[NSData base64DataFromString:str]; NSString *stt=[NSString stringWithFormat:@"%@",data]; printf("\n stt %s",[stt…

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• Decompressing a very large serialized object and managing memory

  - by Mike_G

  I have an object that contains tons of data used for reports. In order to get this object from the server to the client I first serialize the object in a memory stream, then compress it using the Gzip stream of .NET. I then send the compressed object as a byte[] to the client. The problem is on some…

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• memcpy segmentation fault on linux but not os x

  - by Andre

  I'm working on implementing a log based file system for a file as a class project. I have a good amount of it working on my 64 bit OS X laptop, but when I try to run the code on the CS department's 32 bit linux machines, I get a seg fault. The API we're given allows writing DISK_SECTOR_SIZE (512)…

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• Media Foundation: Custom Media Source features

  - by Ivan Dyachkoff

  With IMFMediaSource and IMFByteStreamHandler I can access bytes from media source to determine media type and audio/video stream parameters, such as duration, quality, number of streams, etc. But can I replace these bytes and send them back to client? E.g. I receive zip file bytestream, extract…

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• .Net 3.5 Asynchronous Socket Server Performance Problem

  - by iBrAaAa

  I'm developing an Asynchronous Game Server using .Net Socket Asynchronous Model( BeginAccept/EndAccept...etc.) The problem I'm facing is described like that: When I have only one client connected, the server response time is very fast but once a second client connects, the server response time…

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• bmp image header doubts

  - by vikramtheone

  Hi Guys, I'm doing a project where I have to make use of the pixel information of a bmp image. So, I'm gathering the image information by reading the header information of the input .bmp image. I'm quite successful with everything but one thing bothers me, can any one here clarify it? …

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• array read by one element

  - by Valdas

  I have bytes file. Now need to read it by one bytes. How i can make that? Its possible read array and remove readed element?

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• How decode an encoded string?

  - by Madan Mohan

  Whle decoding, I got this as out put.I am getting NSData bytes by decoding a string.I am converting NSData bytes as string then I am getting the following otu put. -(void)decodeAction:(NSString*)str { NSData *data=[NSData base64DataFromString:str]; NSString *stt=[NSString…

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• Best practice to handle non-english characters in Ruby?

  - by ragnarius

  My program file is encoded in UTF-8 so "abc".length == 3 but "åäö".length == 6. I realize that å, ä, ö, etc. are stored as two bytes in UTF-8, and that a Ruby String is a sequence of bytes (not characters), but it is annoying! Is there a best practice to work around this…

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• Best practice to handle non-english characters is ruby?

  - by ragnarius

  Hi! My program file is encoded in utf-8 so "abc".length==3 but "åäö".length==6. I realize that å,ä,ö, are stored as two bytes in utf-8, and that a ruby String is a sequence of bytes (not characters), but it is annoying! Is there a best practice to work around this…

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• emacs: why does what-cursor-position return less than the expected value?

  - by Cheeso

  Suppose I have a source file that is 18218 bytes. I open the file in emacs, then do: M-x end-of-buffer M-x what-cursor-position Why does the cursor position return 17612 bytes? I think it's because of CRLF translation, or collapsing CRLF into one…

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• std::ostream interface to an OLE IStream

  - by PaulH

  I have a Visual Studio 2008 C++ application using IStreams. I would like to use the IStream connection in a std::ostream. Something like this: IStream* stream = /*create valid IStream instance...*/; IStreamBuf< WIN32_FIND_DATA > sb( stream );…

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