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[;1m-spec binary_to_term(Binary, Opts) -> term() | {term(), Used}[0m
[;1m when[0m
[;1m Binary :: ext_binary(),[0m
[;1m Opt :: safe | used,[0m
[;1m Opts :: [Opt],[0m
[;1m Used :: pos_integer().[0m
[;;4mSince[0m:
OTP R13B04
As [;;4mbinary_to_term/1[0m, but takes these options:
[;;4m[;;4msafe[0m[0m:
Use this option when receiving binaries from an untrusted
source.
When enabled, it prevents decoding data that can be used to
attack the Erlang runtime. In the event of receiving unsafe
data, decoding fails with a [;;4mbadarg[0m error.
This prevents creation of new atoms directly, creation of new
atoms indirectly (as they are embedded in certain structures,
such as process identifiers, refs, and funs), and creation of
new external function references. None of those resources are
garbage collected, so unchecked creation of them can exhaust
available memory.
> binary_to_term(<<131,100,0,5,"hello">>, [safe]).
** exception error: bad argument
> hello.
hello
> binary_to_term(<<131,100,0,5,"hello">>, [safe]).
hello
Warning:
The [;;4msafe[0m option ensures the data is safely processed by
the Erlang runtime but it does not guarantee the data is
safe to your application. You must always validate data
from untrusted sources. If the binary is stored or
transits through untrusted sources, you should also
consider cryptographically signing it.
[;;4m[;;4mused[0m[0m:
Changes the return value to [;;4m{Term, Used}[0m where [;;4mUsed[0m is the
number of bytes actually read from [;;4mBinary[0m.
> Input = <<131,100,0,5,"hello","world">>.
<<131,100,0,5,104,101,108,108,111,119,111,114,108,100>>
> {Term, Used} = binary_to_term(Input, [used]).
{hello, 9}
> split_binary(Input, Used).
{<<131,100,0,5,104,101,108,108,111>>, <<"world">>}
Failure: [;;4mbadarg[0m if [;;4msafe[0m is specified and unsafe data is
decoded.
See also [;;4mterm_to_binary/1[0m, [;;4mbinary_to_term/1[0m, and [;;4m[0m
[;;4mlist_to_existing_atom/1[0m.
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