Constructing and Manipulating Raw Strings

Constructing and Manipulating Raw Strings

[Nordlöw]

What is the best way to extract the individual bytes from hexadecimal
string (output from md5) and using them as input into a call to
unibyte-string()?

I want to use this raw string as a key in a hash table for file types
and then I don't want to waste space (size halves if we go from a
hexadecimal string to a raw byte string).

Does read() (or some of its variants) support reading raw unibyte
strings (that may contain zero bytes).

Thanks in advance,
Per Nordlöw

Re: Constructing and Manipulating Raw Strings

[Pascal J. Bourguignon]

Nordlöw <per.nordlow@gmail.com> writes:

> What is the best way to extract the individual bytes from hexadecimal
> string (output from md5) and using them as input into a call to
> unibyte-string()?
>
> I want to use this raw string as a key in a hash table for file types
> and then I don't want to waste space (size halves if we go from a
> hexadecimal string to a raw byte string).
>
> Does read() (or some of its variants) support reading raw unibyte
> strings (that may contain zero bytes).

You can use decode-hex-string instead:

(decode-hex-string "4142434445464748494a4b4c4d4e4f")
--> "ABCDEFGHIJKLMNO"

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

Re: Constructing and Manipulating Raw Strings

[Nordlöw]

On 13 Okt, 17:53, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> Nordlöw <per.nord...@gmail.com> writes:
> > What is the best way to extract the individual bytes from hexadecimal
> > string (output from md5) and using them as input into a call to
> > unibyte-string()?
>
> > I want to use this raw string as a key in a hash table for file types
> > and then I don't want to waste space (size halves if we go from a
> > hexadecimal string to a raw byte string).
>
> > Does read() (or some of its variants) support reading raw unibyte
> > strings (that may contain zero bytes).
>
> You can use decode-hex-string instead:
>
> (decode-hex-string "4142434445464748494a4b4c4d4e4f")
> --> "ABCDEFGHIJKLMNO"
>
> --
> __Pascal Bourguignon__                    http://www.informatimago.com/

Thanks,
Per