473,378 Members | 1,138 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,378 software developers and data experts.

Files and Checksums

Rob
Good afternoon,

Is it possible to have JavaScript do a checksum of a file a user has
chosen to upload via a multipart html form? I'd like have JavaScript
do a checksum on the client side, embedded the result in the form, and
then have a CGI on the server check to ensure the server-side checksum
matches the client. Is such a thing even possible?

Thanks in advance for any advice.

Rob
Jul 20 '05 #1
1 2796
Rob wrote:
Is it possible to have JavaScript do a checksum of a file a user has
chosen to upload via a multipart html form? I'd like have JavaScript
do a checksum on the client side, embedded the result in the form, and
then have a CGI on the server check to ensure the server-side checksum
matches the client. Is such a thing even possible?


Part of your question is already mentioned in the FAQ:

<URL:http://jibbering.com/faq/#FAQ4_3>

Obviously, you'll need access to the filesystem to checksum the file.

On the other hand, what you describe is already provided for by HTTP. Look
into the Content-MD5 header:

<URL:http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.15>

I have no idea what browser support for this is like.
--
Jim Dabell

Jul 20 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

8
by: Ricky Romaya | last post by:
Hi, I'm working on a file upload script. I need to calculate the CRC32 of the file(s) which are successfully uploaded. How can I do this? PHP only have CRC32 function for strings. However, the...
12
by: Ola Natvig | last post by:
Hi all Does anyone know of a fast way to calculate checksums for a large file. I need a way to generate ETag keys for a webserver, the ETag of large files are not realy nececary, but it would be...
44
by: Xah Lee | last post by:
here's a large exercise that uses what we built before. suppose you have tens of thousands of files in various directories. Some of these files are identical, but you don't know which ones are...
0
by: Missaka Wijekoon | last post by:
Folks, I have 3 mysql replicated servers ( 1 master + 2 slaves). One thing I noticed is that every once in a while the data (*.MYD) and index (*.MYI) files for a table may differ from the other...
27
by: Eric | last post by:
Assume that disk space is not an issue (the files will be small < 5k in general for the purpose of storing preferences) Assume that transportation to another OS may never occur. Are there...
7
by: RayAll | last post by:
I am using HTTP to upload files to a database ,I'm just curious if I can do it through FTP too and what would be the advantages and disadvantages of these two method? Thanks
6
by: Steven | last post by:
I have a problem with moving the backup of my database from machine to machine. The size is 17 Gig and my network keeps timing out when I try to ftp it from machine to machine. I have had the...
8
by: dagecko | last post by:
Hi I would like to know how to detect if a file is binary or not. It's important for me but I don't know where to start. Ty
11
by: MarkusR | last post by:
Good day, I need to safely copy files from one directory to another. I need to make sure that I do not lock the file making it unreadable by others. I am not sure if this is the default...
1
by: gdubois | last post by:
Hi all! Is there an easy way to scan files on network, and find out which files are new or modified? (VS2003, C#) I am trying to create a program to help myself manage the network. I am...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome former...
0
by: ryjfgjl | last post by:
In our work, we often need to import Excel data into databases (such as MySQL, SQL Server, Oracle) for data analysis and processing. Usually, we use database tools like Navicat or the Excel import...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: aa123db | last post by:
Variable and constants Use var or let for variables and const fror constants. Var foo ='bar'; Let foo ='bar';const baz ='bar'; Functions function $name$ ($parameters$) { } ...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.