30 lines
1012 B
Lua
30 lines
1012 B
Lua
function load_velx(read, seek, close, name)
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-- Load a VELX format library.
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local magic, fver, compression, lver, osid, arctype, psize, lsize, ssize, rsize = string.unpack(velx_header, read(string.packsize(velx_header)))
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if (magic ~= "\27VelX") then
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return nil, "bad magic ("..magic..")"
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end
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if (osid & 0x7F ~= 0x5A or osid & 0x7F ~= 0x7F) then
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return nil, string.format("wrong os (%x)", osid & 0x7F)
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end
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if (compression > 1) then
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return nil, "bad compression"
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end
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if ((arctype ~= "\0\0\0\0" and (arctype ~= "tsar" and osid & 0x7F == 0x5A))) then
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return nil, "bad arctype ("..arctype..")"
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end
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if (fver ~= 1) then
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return nil, "wrong version"
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end
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local prog = read(psize)
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if (compression == 1) then
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prog = lzss_decompress(prog)
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end
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seek(lsize+ssize)
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local env = {}
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if (arctype == "tsar") then
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env._ARCHIVE = tsar.read(read, seek, close)
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end
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setmetatable(env, {__index=_G, __newindex=function(_, i, v) _G[i] = v end})
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return load(prog, "="..(name or "(loaded velx)"), "t", env)
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end |