mirror of
https://github.com/Adorable-Catgirl/Zorya-NEO.git
synced 2024-11-23 18:58:06 +11:00
86 lines
2.0 KiB
Lua
86 lines
2.0 KiB
Lua
local f = io.stdin:read("*a")
|
|
|
|
local function mkstr(d)
|
|
local dat = "\""
|
|
for i=1, #f do
|
|
if (d:byte(i) == 0) then
|
|
dat = dat .. "\0"
|
|
elseif (d:sub(i,i) == "\\") then
|
|
dat = dat .. ("\\\\")
|
|
elseif (d:sub(i,i) == "\"") then
|
|
dat = dat .. ("\\\"")
|
|
elseif (d:sub(i,i) == "\n") then
|
|
dat = dat .. ("\\n")
|
|
elseif (d:sub(i,i) == "\r") then
|
|
dat = dat .. ("\\r")
|
|
else
|
|
dat = dat .. (d:sub(i,i))
|
|
end
|
|
end
|
|
dat = dat .. ("\"")
|
|
return dat
|
|
end
|
|
|
|
local M = {}
|
|
local string, table = string, table
|
|
|
|
--------------------------------------------------------------------------------
|
|
local POS_BITS = 12
|
|
local LEN_BITS = 16 - POS_BITS
|
|
local POS_SIZE = 1 << POS_BITS
|
|
local LEN_SIZE = 1 << LEN_BITS
|
|
local LEN_MIN = 3
|
|
|
|
--------------------------------------------------------------------------------
|
|
function lzss_compress(input)
|
|
local offset, output = 1, {}
|
|
local window = ''
|
|
|
|
local function search()
|
|
for i = LEN_SIZE + LEN_MIN - 1, LEN_MIN, -1 do
|
|
local str = string.sub(input, offset, offset + i - 1)
|
|
local pos = string.find(window, str, 1, true)
|
|
if pos then
|
|
return pos, str
|
|
end
|
|
end
|
|
end
|
|
|
|
while offset <= #input do
|
|
local flags, buffer = 0, {}
|
|
|
|
for i = 0, 7 do
|
|
if offset <= #input then
|
|
local pos, str = search()
|
|
if pos and #str >= LEN_MIN then
|
|
local tmp = ((pos - 1) << LEN_BITS) | (#str - LEN_MIN)
|
|
buffer[#buffer + 1] = string.pack('>I2', tmp)
|
|
else
|
|
flags = flags | (1 << i)
|
|
str = string.sub(input, offset, offset)
|
|
buffer[#buffer + 1] = str
|
|
end
|
|
window = string.sub(window .. str, -POS_SIZE)
|
|
offset = offset + #str
|
|
else
|
|
break
|
|
end
|
|
end
|
|
|
|
if #buffer > 0 then
|
|
output[#output + 1] = string.char(flags)
|
|
output[#output + 1] = table.concat(buffer)
|
|
end
|
|
end
|
|
|
|
return table.concat(output)
|
|
end
|
|
|
|
local tmp = os.tmpname()
|
|
local h = io.popen("luacomp ../utils/selfextract.lua -O"..tmp, "w")
|
|
h:write(mkstr(lzss_compress(f)))
|
|
h:close()
|
|
local f = io.open(tmp, "rb")
|
|
io.stdout:write(f:read("*a"))
|
|
f:close()
|
|
os.remove(tmp) |