48 replies to this topic

[Xtansia]

Added: contains(string,find) --Returns true if @string contains @find

[Xtansia]

Another update:
Re-factoring of code,
Added:
CRC32(str) --Returns CRC32 Hash of @str
FCS16(str) --Returns FCS16 Hash of @str
FCS32(str) --Returns FCS32 Hash of @str
replace(str, from, to) --Replaces @from to @to in @str

[Liraal]

just to make it clear: does your API contain the necessary license note? If so, is it OK if I ship it with my OS?

[Garthog]

I've got an error when trying to decrypt unencrypted string. I'm making a crypted communication between turtles and a computer, but if someone broadcast a simple string like test, it will crash all my turtles with error : StrUtil:614 bad argument #1: invalid value

How to reproduce :

StrUtil.decrypt("test", "somekey")

[Xtansia]

Liraal, on 04 March 2012 - 12:24 PM, said:

just to make it clear: does your API contain the necessary license note? If so, is it OK if I ship it with my OS?

Yes the license is included, There is a separate license file included in the download, But it is also included at the top of the API file. Yes it is fine, as long as you clearly state on the thread that it is mine.

Garthog, on 05 March 2012 - 12:39 AM, said:

I've got an error when trying to decrypt unencrypted string. I'm making a crypted communication between turtles and a computer, but if someone broadcast a simple string like test, it will crash all my turtles with error : StrUtil:614 bad argument #1: invalid value

How to reproduce :

StrUtil.decrypt("test", "somekey")

It is because you are trying to decrypt an unencrypted string.

[Garthog]

Sure, but it shouldn't crash the whole program.

[Xtansia]

Garthog, on 05 March 2012 - 10:57 AM, said:

Sure, but it shouldn't crash the whole program.

Quick Fix:
Open String Utils change the decrypt function to:

function decrypt(str, key)  --Decrypts @str with @key
if not key then return nil end
str = tostring(str)
local key = SHA1(key)
local strLen = str:len()
local keyLen = key:len()
local j=1
local result = ""
for i=1, strLen, 2 do
  local ordStr = basen(tonumber(string.reverse(str:sub(i, i+1)),36),10)
  if j==keyLen then j=1 end
  local ordKey = string.byte(key:sub(j,j))
  local nxChar = ordStr-ordKey
  if nxChar<0 or nxChar>255 then nxChar = 0 end
  result = result..string.char(nxChar)
  j = j+1
end
return result:sub(11)
end

[immibis]

function isEmailAddress(str) --Checks if @str is a valid email address
	if not str then return nil end
	str = tostring(str)
    if (str:match("[A-Za-z0-9%.%%%+%-][email protected][A-Za-z0-9%.%%%+%-]+%.%w%w%w?%w?")) then
	    return true
    else
	    return false
    end
end

Does this match all valid email addresses?
They don't necessarily contain dots or 2-4 letter TLDs. Or even alphabetic TLDs.

[email protected] is a perfectly valid email address, so is [email protected] (even though .music doesn't exist) or [email protected] or even "hi there!"@foo (if I interpreted RFC 822 correctly)

[DerrikeG]

function trim(str)  --Trim @str of initial/trailing whitespace
	if not str then return nil end
	str = tostring(str)
	return (str:gsub("^%s*(.-)%s*$", "%1"))
end

The above code could be written as:

function trim(str)  --Trim @str of initial/trailing whitespace
	return tostring(str):gsub("^%s*(.-)%s*$", "%1")
end

Both functions here would successfully return nil if passed nil, enabling you to return nil.Also assigning the variable as its tostringed self is unnecessary since you can pass the return of tostring to gsub as demonstrated without needing it set to a variable.
Wrapping the return in parenthesis only suppresses the gsub's additional return values but there's no reason to do that since it helps someone to determine whether or not the string was actually trimmed.

[Graypup]

Can I bundle your SHA1 in my OS so that I don't have a dependency problem?

[Xtansia]

Graypup, on 01 July 2012 - 07:22 PM, said:

Can I bundle your SHA1 in my OS so that I don't have a dependency problem?

Here's the file you'll need with only the SHA1 stuff in it for you: https://bitbucket.or...5fc0ec/SHA1.lua

[Graypup]

I copied the contents of the file into my API. Thanks!
I'm trying to make the OS as secure as possible, so encryption certainly helped.

[nintendofan345]

Does this work with the read() in the common password doors? I'm trying to use toHex like this:

StrUtil.toHex(read())

But when I run the program it fails with the following error:

startup:4: attempt to index ? (a nil value)

I really don't know how to fix this except by using read() by itself. Thanks in advance for any help.

[MysticT]

nintendofan345, on 06 July 2012 - 12:35 AM, said:

Does this work with the read() in the common password doors? I'm trying to use toHex like this:

StrUtil.toHex(read())

But when I run the program it fails with the following error:

startup:4: attempt to index ? (a nil value)

I really don't know how to fix this except by using read() by itself. Thanks in advance for any help.

Looks like the api is not loaded, it might be an installation error, maybe the file has another name.
EDIT:
Try with StrUtils instead of StrUtil, that should fix it

[nintendofan345]

Oh, that worked, thank you.

[Graypup]

*fixed*

[ETHANATOR360]

when i installed this i opened the lua prompt and put toOctal ("hi") and i got attempt to call nil

[Xtansia]

ETHANATOR360, on 05 August 2012 - 10:31 PM, said:

when i installed this i opened the lua prompt and put toOctal ("hi") and i got attempt to call nil

You need to put the name the api is saved as in front.
So if you saved it as StrUtil then you would do
StrUtil.toOctal("Hi")

[ETHANATOR360]

thanks />

[ETHANATOR360]

i saved it as SU and typed SU.toOctal("hi") and got attempt to index a nil value. what am i doing wrong now?