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annotate lua/luadyncall/src/dynstruct.lua @ 43:1086ca649715

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- fixed use after free issue with string handling (keeping strings as copy until after call)
author Tassilo Philipp
date Wed, 15 Apr 2020 21:58:13 +0200
parents 0cfcc391201f
children
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1 require "ldynstruct"
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2 require "dyntype"
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3
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4 dynstruct_metatable = {
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5 __index = function(s, f)
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6 local typeinfo = rawget(s, "typeinfo")
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7 local fieldinfo = typeinfo.fields[f]
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8 if not fieldinfo then error("unknown field "..f.." for type "..typeinfo.name) end
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9 return ldynstruct.dynpeek( rawget(s, "pointer"), fieldinfo.offset, fieldinfo.typeinfo.signature )
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10 end,
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11 __newindex = function(s, f, v)
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12 local typeinfo = rawget(s, "typeinfo")
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13 local fieldinfo = typeinfo.fields[f]
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14 if not fieldinfo then error("unknown field "..f.." for type "..typeinfo.name) end
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15 ldynstruct.dynpoke( rawget(s, "pointer"), fieldinfo.offset, fieldinfo.typeinfo.signature, v )
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16 end
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17 }
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18
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19 function newdynstruct(typename)
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20 local typeinfo = gettypeinfo(typename)
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21 local object = { pointer = ldynstruct.newstruct( typeinfo.size ), typeinfo = typeinfo }
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22 setmetatable(object, dynstruct_metatable)
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23 return object
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24 end
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25
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26 function dyncast(object, typeinfo)
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27 local pointer
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28 if type(object) == "userdata" then
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29 pointer = object
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30 elseif type(object) == "table" then
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31 pointer = rawgeti(object, "pointer")
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32 end
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33 local object = { pointer = pointer, typeinfo = gettypeinfo(typeinfo) }
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34 setmetatable(object, dynstruct_metatable)
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35 return object
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36 end
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