Re: [PATCH -ac] Panicking in morse code

["jdow" <jdow@earthlink.net>]

From: "Daniel Phillips" <phillips@arcor.de>

> On Thursday 25 July 2002 14:51, Bill Davidsen wrote:
> > On Fri, 19 Jul 2002, Alan Cox wrote:
> >
> > > > +static const char * morse[] = {
> > > > + ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", /* A-H */
> > > > + "..", ".---.", "-.-", ".-..", "--", "-.", "---", ".--.", /* I-P */
> > > > + "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", /* Q-X */
> > > > + "-.--", "--..", /* Y-Z */
> > > > + "-----", ".----", "..---", "...--", "....-", /* 0-4 */
> > > > + ".....", "-....", "--...", "---..", "----." /* 5-9 */
> > >
> > > How about using bitmasks here. Say top five bits being the length,
lower
> > > 5 bits being 1 for dash 0 for dit ?
> >
> > ??? If the length is 1..5 I suspect you could use the top two bits and
fit
> > the whole thing in a byte. But since bytes work well, use the top three
> > bits for length without the one bit offset. Still a big win over
strings,
> > although a LOT harder to get right by eye.
>
> Please read back through the thread and see how 255 different 7 bit codes
> complete with lengths can be packed into 8 bits.

It appears someone is under the misapprehension that Morse characters are
all 5 elements or less. "SK" is an example of a six element meta-character,
one of a set that needs caring for, "...-.-".

(Gawd I wish I could forget that silly communications mode. <sigh>)

{^_^}    W6MKU (Color me a spread-spectrum maven.)