Convert a crash dump Refc binary back to a regular binary. Uses the erl_eval module to evaluate the 16#... hex conversion much faster than naive string handling would do it in this little space.

cdumpbin.erl

%% Convert a crashdump binary back into a regular binary
%% Crash dump binary:
%% =binary:CFE75808  % <- reference to refc binary
%% CA:2A31300D0A24350D0A484D5345540D0...  % <- actual binary
CDumpBin = fun(Str) ->
  [Len,Num] = string:tokens(Str, ":"),
  Src= lists:flatten(["<<16#",Num,":(16#",Len,"*8)>>."]),
  {ok, Tokens, _}=erl_scan:string(Src),
  {ok, [Form]} = erl_parse:parse_exprs(Tokens),
  {value, Val, _} = erl_eval:expr(Form, erl_eval:new_bindings()),
  Val
end.

%% 1> CDumpBin("CA:2A31300D0A24350D0A484D5345540D0A...").
%% <<"*10\r\n$5\r\nHMSET\r\n$16\r\ndrain:661...">>