[erlang-questions] A pointless problem?
Sat Nov 17 18:28:42 CET 2012
This looks as endianness problem. You have to keep in-mind that binaries is big-endian by default, which contrasts with C memory. You have to be very careful of C algorithms mapping.
I've made a small fixes to int32list_xxx routines (see bold text):
int32list_from_binary(<<X:32/little, Bin/binary>>, Acc) ->
int32list_from_binary(<<>>, Acc) ->
list_to_binary([<<X:32/little>> || X <- List]).
Some of tests got passed. Unfortunately, some of tests are failed I hope you can easily validate rest of you code agains endian.
On Nov 17, 2012, at 7:02 PM, Steve Davis wrote:
> I am intrigued by what is arguably a pointless problem.
> Looking at the tiny encryption algorithm aka XXTEA it seemed easy enough to implement in Erlang. I have an implementation (attached with source and all references inside the module) which encodes and decodes successfully... BUT the cipher text doesn't match the test vectors...
> What makes this pointless is that I should "just make it a NIF" etc. But it's likely that I am misunderstanding some aspect of either Erlang or C, however I am confounded as to what that problem is... why does the attached implementation not generate the same ciphertext as in the test vectors from the C implementation? Can anyone spot my error?
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