How can I interact with LOVE2D objects in C code?

[NetherGranite]

Let's say I have the following Lua code:

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local imageData = love.image.newImageData(100, 100)

someLibrary.doSomethingTo(imageData)

and let's say that doSomethingTo() is defined by

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void doSomethingDo(lua_State *L) {
    u_int8 * data = // code here
}

What code needs to go at "// code here" so that the variable "data" will now hold the array of data of the ImageData?

I was able to find this code in LOVE2D's source if it helps at all:

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void *ImageData::getData() const
{
    return data;
}