mirror of
https://github.com/MikaylaFischler/cc-mek-scada.git
synced 2024-08-30 18:22:34 +00:00
115 lines
3.6 KiB
Lua
115 lines
3.6 KiB
Lua
---@diagnostic disable: undefined-global
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local b64_lookup = {
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['A'] = 0, ['B'] = 1, ['C'] = 2, ['D'] = 3, ['E'] = 4, ['F'] = 5, ['G'] = 6, ['H'] = 7, ['I'] = 8, ['J'] = 9, ['K'] = 10, ['L'] = 11, ['M'] = 12, ['N'] = 13, ['O'] = 14, ['P'] = 15, ['Q'] = 16, ['R'] = 17, ['S'] = 18, ['T'] = 19, ['U'] = 20, ['V'] = 21, ['W'] = 22, ['X'] = 23, ['Y'] = 24, ['Z'] = 25,
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['a'] = 26, ['b'] = 27, ['c'] = 28, ['d'] = 29, ['e'] = 30, ['f'] = 31, ['g'] = 32, ['h'] = 33, ['i'] = 34, ['j'] = 35, ['k'] = 36, ['l'] = 37, ['m'] = 38, ['n'] = 39, ['o'] = 40, ['p'] = 41, ['q'] = 42, ['r'] = 43, ['s'] = 44, ['t'] = 45, ['u'] = 46, ['v'] = 47, ['w'] = 48, ['x'] = 49, ['y'] = 50, ['z'] = 51,
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['0'] = 52, ['1'] = 53, ['2'] = 54, ['3'] = 55, ['4'] = 56, ['5'] = 57, ['6'] = 58, ['7'] = 59, ['8'] = 60, ['9'] = 61, ['+'] = 62, ['/'] = 63
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}
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local BYTE = 0xFF
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local CHAR = string.char
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local BOR = bit.bor ---@type function
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local BAND = bit.band ---@type function
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local LSHFT = bit.blshift ---@type function
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local RSHFT = bit.blogic_rshift ---@type function
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-- decode a base64 string
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---@param input string
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local function b64_decode(input)
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---@diagnostic disable-next-line: undefined-field
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local t_start = os.epoch("local")
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local decoded = {}
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local c_idx, idx = 1, 1
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for _ = 1, input:len() / 4 do
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local block = input:sub(idx, idx + 4)
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local word = 0x0
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-- build the 24-bit sequence from the 4 characters
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for i = 1, 4 do
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local num = b64_lookup[block:sub(i, i)]
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if num then
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word = BOR(word, LSHFT(b64_lookup[block:sub(i, i)], (4 - i) * 6))
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end
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end
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-- decode the 24-bit sequence as 8 bytes
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for i = 1, 3 do
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local char = BAND(BYTE, RSHFT(word, (3 - i) * 8))
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if char ~= 0 then
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decoded[c_idx] = CHAR(char)
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c_idx = c_idx + 1
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end
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end
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idx = idx + 4
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end
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---@diagnostic disable-next-line: undefined-field
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local elapsed = (os.epoch("local") - t_start)
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local decoded_str = table.concat(decoded)
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return decoded_str, elapsed
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end
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-- write files recursively from base64 encodings in a table
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---@param files table
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---@param path string
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local function write_files(files, path)
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fs.makeDir(path)
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for k, v in pairs(files) do
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if type(v) == "table" then
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if k == "system" then
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-- write system files to root
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write_files(v, "/")
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else
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-- descend into directories
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write_files(v, path .. "/" .. k .. "/")
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end
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---@diagnostic disable-next-line: undefined-field
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os.sleep(0.05)
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else
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local handle = fs.open(path .. k, "w")
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local text, time = b64_decode(v)
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print("decoded '" .. k .. "' in " .. time .. "ms")
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handle.write(text)
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handle.close()
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end
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end
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end
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local function write_install()
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local handle = fs.open("install_manifest.json", "w")
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handle.write(b64_decode(install_manifest))
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handle.close()
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handle = fs.open("ccmsim.lua", "w")
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handle.write(b64_decode(ccmsi_offline))
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handle.close()
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end
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lgray()
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-- write both app and dependency files
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write_files(app_files, "/")
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write_files(dep_files, "/")
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-- write a install manifest and offline installer
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write_install()
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green()
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print("Done!")
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white()
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print("All files have been installed. The app can be started with 'startup' and configured with 'configure'.")
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lgray()
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print("Hint: You can use 'ccmsim' to manage your off-line installation.")
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white()
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