alertsferro.blogg.se - How to create a zero byte file

#HOW TO CREATE A ZERO BYTE FILE SOFTWARE#
#HOW TO CREATE A ZERO BYTE FILE CODE#
#HOW TO CREATE A ZERO BYTE FILE WINDOWS#

The Exdupe program uses all available threads, making the overhead of hashing negligible compared to IO & compression. In 2009 it was said to only take 6.1cycles per byte on a Core 2 Duo, probably takes even fewer cycles these days. The hashing used is SHA256 via the Skein method (hash_function). I have a fork of, a c++ program, that dedupes and compresses files as fast as the storage device can read or write. What can explain this given that I'm only reading 1024 bytes of the file regardless of how big it is? I was expecting it to be orders of magnitude faster, because I'm only reading the first 1KB of each file, and some of the files are many megabytes.įurther investigation shows that larger files take much longer than smaller files. To my fairly big surprise this is also extremely slow. Using (var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read, 1024))

#HOW TO CREATE A ZERO BYTE FILE CODE#

This is the code I ended up with: private string stupidHash(string fileName)

I decided for my purposes I can make the hashing part of the program much simpler, so I decided to simply read in the first 1024 bytes of the file and add up their values. OK, thats just some context for my question, which is not about MD5 hashing: It was extremely slow, getting through a ~ 5MB file in about half a second. I just used the first thing I could find which was 5.

#HOW TO CREATE A ZERO BYTE FILE WINDOWS#

Windows 10.Īt a certain step in the algorithm I'm hashing files to help determine if they are the same or not. Its a very fast SSD on a decent gaming rig. I'm making a simple app to find duplicate files on my drive. Read detailed descriptions of the rules here.

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#HOW TO CREATE A ZERO BYTE FILE SOFTWARE#

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