81 lines
1.8 KiB
Lua
81 lines
1.8 KiB
Lua
local velx_spec = struct {
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endian = "<",
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{magic="c5"},
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{fver="B"},
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{compression="B"},
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{lver="B"},
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{os="B"},
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{psize="I3"},
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{lsize="I3"},
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{ssize="I3"},
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{rsize="I4"}
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}
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local velx = {}
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local exec = {}
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function velx.identify(path)
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local h = io.open(path, "rb")
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local header = velx_spec(h:read(#velx_spec))
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h:close()
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return header.magic == "\27VelX"
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end
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function velx.load(path)
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end
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function velx.verify(path)
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local h = io.open(path, "rb")
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local header = velx_spec(h:read(#velx_spec))
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local code = h:read(header.psize)
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h:seek("cur", lsize)
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local sig = h:read(header.ssize)
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h:close()
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return security.verify(code, sig)
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end
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function exec:link()
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self.file:seek("set", #velx_spec+self.header.psize)
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local linkinfo = self.file:read(self.header.lsize)
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local linker = {}
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local pos = 1
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while true do
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local size = string.unpack("<H", linkinfo:sub(pos))
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pos = pos + 2
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local name = linkinfo:sub(pos, pos+size-1)
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pos = pos + size
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size = string.unpack("<H", linkinfo:sub(pos))
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pos = pos + 2
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local library = linkinfo:sub(pos, pos+size-1)
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pos = pos + size
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if (name == "" or library == "") then
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break
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end
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linker[#linker+1] = {name, library}
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end
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local linkscript = ""
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for i=1, #linker do
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linkscript = linkscript .. "local " .. linker[i][1] .. "=require(\"" .. linker[i][2] .. "\")\n"
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end
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self.code = linkscript .. self.code
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return true
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end
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function exec:load()
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self.file:seek("set", #velx_spec)
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local code = self.file:read(self.header.psize)
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if (self.header.compression == 0) then
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self.code = code
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elseif (self.header.compression == 1) then
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self.code = lzss.decompress(self.code)
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else
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return nil, "invalid compression method"
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end
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return true
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end
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function exec:run(args, evar)
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system.load(self.code, args, system.getglobalenv({_ARCHIVE=self.arc}), system.getevars(evar))
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end |