Decoding Error

Thanks so much for the report. I am astonished that after all this time
there actually appears to be an honest to goodness bug in the code.

I will have to review the unit tests to see if I can somehow simulate this.
This would only become a problem if there is a write error. I did test
the code for write errors, but it was limited because it was hard to set
up. The way disk space is allocated I am not even sure if the error can be
created.

I receive bug reports from time to time but they are always because someone
has ripped out some of the code and are making an invalid call into one of
the functions.

Thanks again for making the report. I will review in the next couple of
days and if, as it appears, it is a bug, I will publish corrected code.

Cheers!

Bob Trower

On Mon, Mar 3, 2014 at 8:20 PM, Takashi Ando dodo5522@users.sf.net wrote:

it seems that b64.c has wrong code at line 374.
putc() returns EOF if some error, so the line 374 should be like below.

if(putc((int)out[i],outfile)==EOF){
if(ferror()){
...
}
}

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• [bugs:#6] http://sourceforge.net/p/base64/bugs/6/ Decoding Error*

Status: open
Group:
Created: Wed Mar 20, 2013 05:55 PM UTC by John Peterson
Last Updated: Wed Mar 20, 2013 05:55 PM UTC
Owner: nobody

If you decode a string that doesn't have any padding characters, the final
character is not returned.

Examples (from the review) 'Z2lhbmx1Y2E6YXNkYXNk' decodes as
'gianluca:asdas' but adding an unnecessary padding character (note any
character I tried also worked, 'a', a carriage return, etc):
'Z2lhbmx1Y2E6YXNkYXNk=' decodes as 'gianluca:asdasd'

From Wikipedia (I added single quotes around the encoded text and decoded
text for clarity)
'YW55IGNhcm5hbCBwbGVhcw==' Block with 2 '='s decodes to 1 character: 'any
carnal pleas'
this decodes correctly

'YW55IGNhcm5hbCBwbGVhc3U=' Block with 1 '=' decodes to 2 characters: 'any
carnal pleasu'
this decodes correctly

'YW55IGNhcm5hbCBwbGVhc3Vy' Block with 0 '='s decodes to 3 characters: 'any
carnal pleasur'
this decodes as 'any carnal pleasu'

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