mirror of https://github.com/odrling/Aegisub
113 lines
2.9 KiB
Markdown
113 lines
2.9 KiB
Markdown
luabins — Lua Binary Serialization Library
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==========================================
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Allows to save tuples of primitive Lua types into binary chunks
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and to load saved data back.
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On serialization
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----------------
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### Luabins works with
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* `nil`
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* `boolean`
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* `number`
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* `string`
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* `table` (see below)
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### Luabins refuses to save
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* `function`
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* `thread`
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* `userdata`
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Luabins intentionally does not save or check any meta-information
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(versions, endianness etc.) along with data. If needed, it is to be handled
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elsewhere.
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### Table serialization
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1. Metatatables are ignored.
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2. Table nesting depth should be no more than `LUABINS_MAXTABLENESTING`.
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3. On table save references are not honored. Each encountered reference
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becomes independent object on load:
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local t = { 42 }
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{ t, t }
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becomes
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{ { 42 }, { 42 } }
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that is, three separate tables instead of two.
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Lua API
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-------
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* `luabins.save(...)`
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Saves arguments into a binary string.
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* On success returns that string.
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* On failure returns nil and error message.
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Example:
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local str = assert(luabins.save(1, "two", { "three", 4 }))
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* `luabins.load(string)`
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Loads a list of values from a binary string.
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* On success returns true and loaded values.
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* On failure returns nil and error message.
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Example:
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If you do not know in advance what data is stored inside a binary string,
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you may put results into a table:
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local values = { luabins.load(data) }
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assert(values[1], values[2])
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If you know how to handle stored values (for example you're sure they were
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generated following some established protocol), you may want to use
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something like this function to check `luabins.load()` result:
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function eat_true(t, ...)
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assert(t, ...)
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return ...
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end
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my_value_handler(eat_true(luabins.load(data)))
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C API
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-----
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* `int luabins_save(lua_State * L, int index_from, int index_to)`
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Save Lua values from given state at given stack index range.
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Lua value is left untouched. Note that empty range is not an error.
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You may save from 0 to `LUABINS_MAXTUPLE` values.
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Note only real non-negative indices work.
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* On success returns 0, pushes saved data as a string on the top of stack.
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* On failure returns non-zero, pushes error message on the top
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of the stack.
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* `int luabins_load(lua_State * L, const unsigned char * data,
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size_t len, int *count)`
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Load Lua values from given byte chunk.
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* On success returns 0, pushes loaded values on stack.
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Sets count to the number of values pushed.
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Note that to have zero loaded items is a valid scenario.
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* On failure returns non-zero, pushes error message on the top
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of the stack.
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Luabins is still an experimental volatile software.
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Please see source code for more documentation.
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See the copyright information in the file named `COPYRIGHT`.
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