checksum

问题 I'm iterating over a set of 32-bit hexadecimal strings ("DEADBEEF", "12345678", etc..) and I'm trying to sum them together to form a 32-bit checksum. Assume that the variable $temp is loaded with some hexadecimal string in the example below. my $temp; my $checksum; for (...) { #assume $temp is loaded with a new hex string here my $tempNum = hex ($temp); $checksum += $tempNum; $checksum &= 0xFFFFFFFF; print printf("checksum: %08X",$checksum); } The first few values are "7800798C", "44444444",

问题 We have a 150 Gb data folder. Within that, file content is any format (doc, jpg, png, txt, etc). We need to check all file content against each other to check if there are is duplicate file content. If so, then print the file path name list. For that, first I used ArrayList<File> to store all files, then used FileUtils.contentEquals(file1, file2) method. When I try it for a small amount of files(Folder) it's working but for this 150Gb data folder, it's not showing any result. I think first

问题 I want to checksum the files at browser side before uploading, then checksum and compare at server side to make sure the consistent. But how can I get the pure binary data of the file and checksum it? I tried the way below, but doesn't work: let fileSelect = document.getElementById('file') let files = fileSelect.files let file = files[0] var r = new FileReader(); r.onload = function(){ console.log(r.result); }; r.readAsArrayBuffer(file); var file_sha1 = sha1(r.result) 回答1: The library you are

问题 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,02,41,21,04,02,02,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 This should result in a checksum of 6A. Hopefully someone could help me. If someone has an example writen in Python 3, could also work for

问题 My Subversion 1.7.17 working copy is unhappy with a particular file but is unable to update it. Any attempt to update gives me the same error, even if I delete the file or delete the directory: Updating 'trunk/src/Makefile': svn: E155017: Checksum mismatch for '/Volumes/project/dev/torc/trunk/src/Makefile': expected: 78ee11ff73f3b68c903db838b6667ec3 recorded: 62bbbf4362958e3fd42470650d5b4eb6 I have read through SVN - Checksum mismatch while updating, and its two main solutions are to modify

问题 I tried to generate the checksum for directory using ant. I have tried the below command, but it generates recursively inside each folder for each file. <target name="default" depends=""> <echo message="Generating Checksum for each environment" /> <checksum todir="${target.output.dir}" format="MD5SUM" > <fileset dir="${target.output.dir}" /> </checksum> </target> I just want to generate one checksum for particular directory using Ant command. How do I do that? 回答1: You want to use the

问题 I'm thinking to create a checksum of a dict to know if it was modified or not For the moment i have that: >>> import hashlib >>> import pickle >>> d = {'k': 'v', 'k2': 'v2'} >>> z = pickle.dumps(d) >>> hashlib.md5(z).hexdigest() '8521955ed8c63c554744058c9888dc30' Perhaps a better solution exists? Note: I want to create an unique id of a dict to create a good Etag. EDIT: I can have abstract data in the dict. 回答1: Something like this: reduce(lambda x,y : x^y, [hash(item) for item in d.items()])

问题 I need to calculate the checksum of a csv file. The checksum will change every time the data in the file is changed. I found nothing useful over the internet in this regard. 回答1: First of all, this problem is not specific to JSP. JSP is just a HTML code generator. Writing Java code in a JSP file instead of a normal Java class doesn't make it a JSP problem. You would help yourself more if you concentrate on solving future Java problems using the "Java" keyword, not using the "JSP" keyword.

问题 How to store the current state of crypto.createHash('sha1') (after it got filled with hash.update(buffer) ) to use it at another http request which might occur at a different process of node.js? I imagine doing something like this: var crypto = require('crypto'), hash = someDatabase.read('hashstate') // continue with filled hash || crypto.createHash('sha1'); // start a new hash // update the hash someObj.on('data', function(buffer){ hash.update(buffer); }); someObj.on('end', function(){ //

问题 I have to compare checksum of all files in /primary and /secondary folders in machineA with files in this folder /bat/snap/ which is in remote server machineB . The remote server will have lots of files along with the files we have in machineA . If there is any mismatch in checksum then I want to report all those files that have issues in machineA with full path and exit with non zero status code. If everything is matching then exit zero. I wrote one command (not sure whether there is any