Re: Convert bytes array to string

[Eric Tetz <erictetz@...>]

--- SATO Seichi <seichi@air.ne.jp> wrote:
> How can I convert bytes array to string efficiently in Lua?
> or must I extend with C?
> 
> a sample I wrote:
> 
> function bytestostring (bytes)
>   s = ""
>   for i=1,getn(bytes) do
>     s = s..strchar(bytes[i])  -- '..' create new string. Expensive!!
>   end
>   return s
> end

You can do something like this:

  function bytestostring (bytes)
    local buf = strrep(' ', getn(bytes))
    local i = 0
    return (gsub (buf, '(.)', 
        function(c)
          i = i + 1
          return strchar(bytes[i])
        end))
  end
 
Not exactly pretty, but it's a lot faster than string concatenation.

Cheers,
Eric


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