101 lines
1.9 KiB
Lua
101 lines
1.9 KiB
Lua
local worldpath = mapgen_rivers.world_data_path
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function mapgen_rivers.load_map(filename, bytes, signed, size, converter)
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local file = io.open(worldpath .. filename, 'rb')
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local data = file:read('*all')
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if #data < bytes*size then
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data = minetest.decompress(data)
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end
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local sbyte = string.byte
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local map = {}
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for i=1, size do
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local i0 = (i-1)*bytes+1
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local elements = {data:byte(i0, i1)}
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local n = sbyte(data, i0)
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if signed and n >= 128 then
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n = n - 256
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end
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for j=1, bytes-1 do
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n = n*256 + sbyte(data, i0+j)
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end
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map[i] = n
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end
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file:close()
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if converter then
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for i=1, size do
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map[i] = converter(map[i])
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end
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end
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return map
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end
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local sbyte = string.byte
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local loader_mt = {
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__index = function(loader, i)
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local file = loader.file
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local bytes = loader.bytes
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file:seek('set', (i-1)*bytes)
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local strnum = file:read(bytes)
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local n = sbyte(strnum, 1)
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if loader.signed and n >= 128 then
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n = n - 256
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end
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for j=2, bytes do
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n = n*256 + sbyte(strnum, j)
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end
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if loader.conv then
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n = loader.conv(n)
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end
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loader[i] = n
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return n
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end,
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}
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function mapgen_rivers.interactive_loader(filename, bytes, signed, size, converter)
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local file = io.open(worldpath .. filename, 'rb')
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if file then
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minetest.register_on_shutdown(function()
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file:close()
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end)
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converter = converter or false
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return setmetatable({file=file, bytes=bytes, signed=signed, size=size, conv=converter}, loader_mt)
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end
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end
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function mapgen_rivers.write_map(filename, data, bytes)
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local size = #data
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local file = io.open(worldpath .. filename, 'wb')
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local mfloor = math.floor
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local schar = string.char
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local upack = unpack
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local bytelist = {}
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for j=1, bytes do
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bytelist[j] = 0
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end
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for i=1, size do
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local n = mfloor(data[i])
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data[i] = n
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for j=bytes, 2, -1 do
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bytelist[j] = n % 256
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n = mfloor(n / 256)
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end
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bytelist[1] = n % 256
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file:write(schar(upack(bytelist)))
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end
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file:close()
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end
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