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Calculate CRC32 checksums (like SFVs)
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So far i've got this and it returns something like:
-2087276233
Someone told me that I had to use struct.pack or struct.unpack to change it to hex values.
I am not sure which type to convert to and would like some explanation to understand fully instead of coding in blind.
The final result should show the same CRC32 value as if you packed the file in WinRAR, checked it with the numerous SFV-checkers or whatever.
A link just in case:
http://docs.python.org/library/struct.html
Thanks alot in advance!
-2087276233
Python Syntax (Toggle Plain Text)
Someone told me that I had to use struct.pack or struct.unpack to change it to hex values.
I am not sure which type to convert to and would like some explanation to understand fully instead of coding in blind.
The final result should show the same CRC32 value as if you packed the file in WinRAR, checked it with the numerous SFV-checkers or whatever.
A link just in case:
http://docs.python.org/library/struct.html
Thanks alot in advance!
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Join Date: Jun 2009
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Practically a Posting Shark
Post your code! Check your variables are properly set signed/unsigned!
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Originally Posted by wildgoose 
Post your code! Check your variables are properly set signed/unsigned!
python Syntax (Toggle Plain Text)
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Join Date: Oct 2004
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You may want to try a binary file read.
May 'the Google' be with you!
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Originally Posted by vegaseat
You may want to try a binary file read.
http://dev.jmoiron.net/code/html/cksum.py.html
Can I use this code example to write a more simple approach?
I would prefer it in a single function, but the classes and etc. confuses me, I think he should simplify his code, it also gives a deprecation warning ..
Can I use this code example to write a more simple approach?
I would prefer it in a single function, but the classes and etc. confuses me, I think he should simplify his code, it also gives a deprecation warning ..
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Join Date: Jul 2008
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Originally Posted by dezza
Can you define this method? I am not sure I understand what you mean.
open method here, and the answer will reveal itself. I have tried both open(filename, 'r') and open(filename, 'rb')
I can get the file loaded into a string and then try
print binascii.crc32(file-in-string)
Still just gives me negative integers, what I want is the 8-char hexvalue.
I can get the file loaded into a string and then try
print binascii.crc32(file-in-string)
Still just gives me negative integers, what I want is the 8-char hexvalue.
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Join Date: Jul 2008
Posts: 1,009
Reputation:
Solved Threads: 244
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Originally Posted by dezza
I have tried both open(filename, 'r') and open(filename, 'rb')
I can get the file loaded into a string and then try
print binascii.crc32(file-in-string)
Still just gives me negative integers, what I want is the 8-char hexvalue.
Use string formatting to print the hex value, just as the example in the docs shows you.
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