local white = (lpeg.S'\0\9\10\12\13\32' + '%' * (1 - lpeg.S'\r\n')^0)^1 local regular = 1-lpeg.S'()<>[]{}/%\0\9\10\12\13\32' local lastbase = '123456789abcdefghiklmnopqrstuvwxyz' local number = lpeg.Cmt(lpeg.R'09'^1/tonumber * '#', function(s, p, base) if base < 2 then return end local pattern if base <= 10 then pattern = lpeg.R('0' .. lastbase:sub(base-1, base-1)) else pattern = lpeg.R'09' + lpeg.R('a' .. lastbase:sub(base-1, base-1)) + lpeg.R('A' .. lastbase:sub(base-1, base-1):upper()) end local num, p = (lpeg.C(pattern^1) * lpeg.Cp()):match(s, p) return p, num and tonumber(num, base) end) + (lpeg.S'+-'^-1 * ('.' * lpeg.R'09'^1 + lpeg.R'09'^1 * lpeg.P'.'^-1 * lpeg.R'09'^0) * (lpeg.S'eE' * lpeg.S'+-'^-1 * lpeg.R'09'^1)^-1)/tonumber local literalstring = lpeg.P{'(' * lpeg.Cs(( lpeg.P'\\n'/'\n'+lpeg.P'\\r'/'\r'+lpeg.P'\\t'/'\t'+lpeg.P'\\b'/'\b'+lpeg.P'\\f'/'\f' +'\\'*lpeg.C(lpeg.R'07'*lpeg.R'07'^-2)/function(n)return string.char(tonumber(n, 8))end +'\\'*('\n' + ('\r' * lpeg.P'\n'^-1))/'' +'\\'*lpeg.C(1)/1 +('\n' + ('\r' * lpeg.P'\n'^-1))/'\n' +(1-lpeg.S'()\\')+lpeg.V(1))^0) * ')'} local hexstring = '<' * lpeg.Cs(( lpeg.C(lpeg.R'09'+lpeg.R'af'+lpeg.R'AF')*(lpeg.C(lpeg.R'09'+lpeg.R'af'+lpeg.R'AF')+lpeg.Cc'0')/function(a,b)return string.char(tonumber(a..b, 16))end)^0) * '>' local name = lpeg.C(regular^1) local lname = '/' * name / 1 local function decrypt(key, n, cipher) -- Generally you should never implement your own crypto. So we call a well known, peer reviewed, -- high-quality cryptographic library. --- Ha-Ha, of course we are implementing by ourselves. -- That might be completely unsecure, but given that the encryption keys are well known constants -- documented in the T1 Spec, there is no need to worry about it. -- Also I do not think any cryptorgraphic library would implement this anyway, it doesn't even -- really deserve the term encryption. local decoded = {string.byte(cipher, 1,-1)} for i=1,#decoded do local c = decoded[i] decoded[i] = c ~ (key>>8) key = (((c+key)&0xFFFF)*52845+22719)&0xFFFF end return string.char(table.unpack(decoded, n+1)) end -- io.stdout:write(decrypt(55665, 4, string.sub(io.stdin:read'a', 7))) local boolean = (lpeg.P'true' + 'false')/{["true"] = true, ["false"] = false} local anytype = {hexstring + literalstring + number + lname + boolean + lpeg.V(2) + name, lpeg.Ct('[' * (white^-1 * lpeg.V(1))^0 * white^-1 * ']' + '{' * (white^-1 * lpeg.V(1))^0 * white^-1 * '}' * white^-1 * lpeg.P"executeonly"^-1)} local dict = lpeg.Cf(lpeg.Carg(1) * lpeg.Cg(white^-1*lname*white^-1*(anytype)*white^-1*lpeg.P"readonly"^-1*white^-1*lpeg.P"noaccess"^-1*white^-1*(lpeg.P"def"+"ND"+"|-"))^0, rawset) local encoding = (white+anytype-("dup"*white))^0/0 * lpeg.Cf(lpeg.Ct'' * lpeg.Cg("dup"*white*number*white^-1*lname*white^-1*"put"*white)^0 , rawset) * lpeg.P"readonly"^-1*white*"def" local function parse_encoding(offset, str) local found found, offset = (encoding*lpeg.Cp()):match(str, offset) return found, offset end local function parse_fontinfo(offset, str) local found repeat found, offset = ((white+(anytype-name))^0/0*name*lpeg.Cp()):match(str, offset) until found == 'begin' found, offset = (dict*lpeg.Cp()):match(str, offset, {}) offset = (white^-1*"end"*white^-1*lpeg.P"readonly"^-1*white^-1*"def"):match(str, offset) return found, offset end local binary_bytes = lpeg.Cmt(number*white^-1*(lpeg.P'-| ' + 'RD '), function(s, p, l)return p+l, s:sub(p, p+l-1) end)*white^-1*(lpeg.P"|-"+"|"+"ND"+"NP") local charstr = white^-1*lname*(white^-1*(anytype-lname))^0/0*white^-1 * lpeg.Cf(lpeg.Ct'' * lpeg.Cg(lname*white^-1*binary_bytes*white)^0 , rawset) * lpeg.P"end"*white local subrs = (white^-1*(anytype-("dup"*white)))^0/0*white^-1 * lpeg.Cf(lpeg.Ct'' * lpeg.Cg("dup"*white^-1*number*white^-1*binary_bytes*white)^0 , rawset) * (lpeg.P"readonly"*white)^-1 * (lpeg.P"noaccess"*white)^-1*(lpeg.P"def"+"ND"+"|-") local function parse_private(offset, str) local mydict, found repeat found, offset = ((white+(anytype-name))^0/0*name*lpeg.Cp()):match(str, offset) until found == 'begin' mydict, offset = (dict*lpeg.Cp()):match(str, offset, {}) found = (white^-1*lname):match(str, offset) if found == "Subrs" then mydict.Subrs, offset = (subrs*lpeg.Cp()):match(str, offset) end return mydict, offset end local function continue_maintable(offset, str, mydict) mydict, offset = (dict*lpeg.Cp()):match(str, offset, mydict) local found = (white^-1*lname):match(str, offset) if found == "FontInfo" then mydict.FontInfo, offset = parse_fontinfo(offset, str) return continue_maintable(offset, str, mydict) elseif found == "Encoding" then mydict.Encoding, offset = parse_encoding(offset, str) return continue_maintable(offset, str, mydict) elseif found == "Private" then mydict.Private, offset = parse_private(offset, str) return continue_maintable(offset, str, mydict) elseif found == "CharStrings" then mydict.CharStrings, offset = (charstr*lpeg.Cp()):match(str, offset) return mydict else local newoffset = ((white+name)^1/0*lpeg.Cp()):match(str, offset) if newoffset and offset <= #str then return continue_maintable(newoffset, str, mydict) end end print(str:sub(offset)) error[[Unable to read Type 1 font]] end local function parse_maintable(offset, str) local found repeat found, offset = ((white+(anytype-name))^0/0*name*lpeg.Cp()):match(str, offset) until found == 'begin' return continue_maintable(offset, str, {}) end return function(filename) local file = io.open(filename, 'rb') local _, length = string.unpack("