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71 lines
1.9 KiB
Plaintext
71 lines
1.9 KiB
Plaintext
The "serial" library is a library to
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serialize and deserialize Lua values
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in a relatively safe* manner.
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* Serialization cannot handle a
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recursive loop correctly,
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and may error() if certain values
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are passed to it.
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The deserialization has unbounded
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time and memory only limited by
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the host. It is possible to kill
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a process indirectly via a
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poisonous file, but it is not
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possible to directly break the
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sandbox without Lua interpreter
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bugs.
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It is not recommended to use serial
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for data that is not from a known
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source, but it is not dangerous to
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system security (but certainly to
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stability) to use it for other
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data so long as no function that
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originated from the data is ever
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executed with objects that can be
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used to elevate privilege.
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(In other words, don't call any
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function if you can't tell where it
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came from. This should be obvious.)
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The serial library has merely two
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functions available to it.
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serialize(val):
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Returns the serialized data as a
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string. The serialized data will
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be in the form of "return ",
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followed by a Lua 5.2-parsable
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value of some sort.
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If dealing with the 3DM format or
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other formats that don't just
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accept we're clearly loading Lua
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code here, the recommendation is
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to perform :sub(8).
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deserialize(str):
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Deserializes "str" by executing it
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in a limited environment and
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grabbing the return value.
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If dealing with the 3DM format or
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other formats that don't just
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accept we're clearly loading Lua
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code here, please prefix str with
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"return ".
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Returns the deserialized data as a
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Lua value.
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A value of nil is an ambiguity:
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it could be the actual data, or it
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could be a deserialization error.
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Check for this situation by reading
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the second returned value.
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If it is not nil, deserialization
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failed with the given error.
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-- This is released into
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the public domain.
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-- No warranty is provided,
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implied or otherwise.
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