The PHP's crc32 support string as input.And For a file , below code will work OFC. crc32(file_get_contents("myfile.CSV")); But if file goes huge (2 GB) it might raise out of memory Fatal error. So any way around to find checksum of huge files ? ...
Hi there, I'm doing a large data migration between two file systems (let's call them F1 and F2) on a Linux system which will necessarily involve copying the data verbatim into a differently-structured hierarchy on F2 and changing the file names. I'd like to write a script to generate a list of files which are in F1 but not in F2, i.e. t...
I am looking to use java or groovy to get the md5 checksum of a complete directory. I have to copy directories for source to target, checksum source and target, and after delete source directories. I find this script for files, but how to do the same thing with directories ? import java.security.MessageDigest def generateMD5(fin...
Why when I only do SELECT on a .sdf file, it's checksum changes ? How can I avoid that ? ...
We have a requirement of reading/writing more than 10 million strings into a file. Also we do not want duplicates in the file. Since the strings would be flushed to a file as soon as they are read we are not maintaining it in memory. We cannot use hashcode because of collisions in the hash code due to which we might miss a string as dup...
How can I create a setup project that will check its own checksum first, before an installation? Or could you show me an example of a programm that will check it's own checksum and inform user if the programm's file probably has been changed and checksum doesn't fit... ...
I've been trying to hash the contents of some zip files from a remote source using PHP's md5_file function: md5_file($url); I'm having a problem with a couple of URLs; I'm getting the following error: Warning: md5_file($url): failed to open stream: HTTP request failed! I think it's because the zip files are quite large in those cas...
I run this script: define('SECRET', "vJs;ly-W\XDkD_2'-M7S2/ZRRBobxt5"); echo sha1(SECRET . 'zcbkeyky' . '[email protected]') . "\n"; Locally with PHP 5.3.2 (cli) it gives me: 3baa47e50394cd2dce236dcbf2f409fdb9010f2a On a remote machine with PHP 5.1.6 (cli) it gives: d1bcf4ea83e50593d3df19a8455a5f5cd32d63ef Why does the same calculation dif...
I need a small program that can calculate the checksum from a user input. Unfortunately, all I know about the checksum is that it's xor all data in packet. I have tried to search the net for an example without any luck. I know if I have a string: 41,4D,02,41,21,04,02,02,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00...
I've been working on an application that will allow for third-party extensions to be built to expand the application's functionality. All this in PHP, of course. I wanted to add a bit of security padding by running files in a certain directory through a checksum function. If the file doesn't pass the checksum, the file isn't "included", ...
The situation is this: My system (Win XP Pro) is unable to copy a huge video file (around 6 gigs) from a DVD disk, which might be defective, scratched or whatever but which can be played back with mplayer with a few frames full of mosaic though. When the copying process lasted for a certain length of time, the system would abort the effo...
I've written a script that reads through all files in a directory and returns md5 hash for each file. However, it renders nothing for a rather large file. I assume that the interpreter has some value set for maximum processing time, and since it takes too long to get this value, it just skips along to other files. Is there anyway to g...
Is there any simple way of generating (and checking) MD5 checksums of a list of files in Python? (I have a small program I'm working on, and I'd like to confirm the checksums of the files). ...
Hi, I am developing an application in flex in which I need to calculate checksum of different files. I would like to know if there is a direct method in actionscript to calculate that or do I have to go for any external libraries? Thanks in advance :) ...
how can i make a checksum of a file using C? i dont want to use any third party, just default c language and also speed is very important (its less the 50mb files but anyway) thanks ...
long make_checksum(const char* str) { long chk=0; long rot=0; while(*str) { rot<<=9; rot|=(rot>>23); rot^=*(char*)str++; chk+=rot; } return chk; } Not waterproof means: there's a chance I can get the same checksum for two different strings. ...
Hi. I have two databases for logging stuff, which I want to check for synchronization. The solution approved is to send periodically (lets say hourly) a select to both, generate a hash of the result set and compare them. If they match then great, otherwise generate some alarms. Currently I'm doing it by (bash script): log_table="SEL...
Can anyone please explain with the easy coding how to reverse this algorithm so that I get back the original text string? Public Function CreateIntChecksum(ByVal s As String) As Integer Dim r As Integer = 0 For i As Integer = 0 To (s.Length() - 1) Dim bchar As Byte = Convert.ToByte(s(i)) r = bchar + ((r << 5) - r...
I am working on CRC64 Reversing algorithm on C# but unable to code it. If anyone can help me out, it will be nice of him. I am desperate to complete the coding. ...
Google Code provides a barcode like this: When you download software. What is its purpose (I assume it is related to the SHA1 checksum, but if so, how is it used)? Edit: Now that I know its name, I found this article. Thanks! ...