[erlang-questions] Real basic binary manipulation question
Sat Jan 17 11:46:10 CET 2009
Problem - to decompress a binary where zeros are run-length encoded.
The following seems to work but also seems ugly and causes unnecessary
%% Decompress binary where Zeros are Run-Length Encoded
decompress(Bin) when is_binary(Bin) ->
L = binary_to_list(Bin),
F = fun(X, [H|T]) when H =:= expand -> lists:duplicate(X, 0) ++ T;
(X, Acc) when X =:= 0 -> [expand] ++ Acc;
(X, Acc) -> [X] ++ Acc
Decompressed = lists:foldl(F, , L),
Any bids on an improvement?
Thanks for any attention.
Side note: the erlang bit syntax is *amazing* when you actually get
down to doing something with IP packets
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