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generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 09:16:46 +0000
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local print=function(t) minetest.log("action", t) minetest.chat_send_all(t) end

--pseudoload.lua
--responsible for keeping up a database of all rail nodes existant in the world, regardless of whether the mapchunk is loaded.

advtrains.trackdb={}
--trackdb[tt][y][x][z]={conn1, conn2, rely1, rely2, railheight}
--serialization format:
--(2byte x)(2byte y)(2byte z)(4bits conn1, 4bits conn2)[(plain rely1)|(plain rely2)|(plain railheight)]\n
--[] may be missing if 0,0,0

--load initially

--[[ TODO temporary outcomment

--delayed since all traintypes need to be registered
minetest.after(0, function()

for tt, _ in pairs(advtrains.all_traintypes) do
	local pl_fpath=minetest.get_worldpath().."/advtrains_trackdb_"..tt
	advtrains.trackdb[tt]={}
	local file, err = io.open(pl_fpath, "r")
	if not file then
		local er=err or "Unknown Error"
		print("[advtrains]Failed loading advtrains trackdb save file "..er)
	else
		--custom format to save memory
		while true do
			local xbytes=file:read(2)
			if not xbytes or #xbytes<2 then
				break --eof reached
			end
			print(xbytes)
			local ybytes=file:read(2)
			local zbytes=file:read(2)
			local x=(string.byte(xbytes[1])-128)*256+(string.byte(xbytes[2]))
			local y=(string.byte(ybytes[1])-128)*256+(string.byte(ybytes[2]))
			local z=(string.byte(zbytes[1])-128)*256+(string.byte(zbytes[2]))
			
			local conn1=string.byte(file:read(1))
			local conn1=string.byte(file:read(1))
			
			if not advtrains.trackdb[tt][y] then advtrains.trackdb[tt][y]={} end
			if not advtrains.trackdb[tt][y][x] then advtrains.trackdb[tt][y][x]={} end
			
			local rest=file.read("*l")
			if rest~="" then
				local rely1, rely2, railheight=string.match(rest, "([^|]+)|([^|]+)|([^|]+)")
				if rely1 and rely2 and railheight then
					advtrains.trackdb[tt][y][x][z]={
						conn1=conn1, conn2=conn2,
						rely1=rely1, rely2=rely2,
						railheight=railheight
					}
				else
					advtrains.trackdb[tt][y][x][z]={
						conn1=conn1, conn2=conn2
					}
				end
			else
				advtrains.trackdb[tt][y][x][z]={
					conn1=conn1, conn2=conn2
				}
			end
		end
		file:close()
	end
end

--end minetest.after
end)

function advtrains.save_trackdb()
	for tt, _ in pairs(advtrains.all_traintypes) do
		local pl_fpath=minetest.get_worldpath().."/advtrains_trackdb_"..tt
		local file, err = io.open(pl_fpath, "w")
		if not file then
			local er=err or "Unknown Error"
			print("[advtrains]Failed saving advtrains trackdb save file "..er)
		else
			--custom format to save memory
			for y,tyl in pairs(advtrains.trackdb[tt]) do
				for x,txl in pairs(tyl) do
					for z,rail in pairs(txl) do
						print("write "..x.." "..y.." "..z.." "..minetest.serialize(rail))
						file:write(string.char(math.floor(x/256)+128)..string.char((x%256)))
						file:write(string.char(math.floor(y/256)+128)..string.char((y%256)))
						file:write(string.char(math.floor(z/256)+128)..string.char((z%256)))
						file:write(string.char(rail.conn1))
						file:write(string.char(rail.conn2))