Serial file transfer protocol / checksums Post: 302786395

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Top Forums Programming Serial file transfer protocol / checksums Post 302786395 by DGPickett on Wednesday 27th of March 2013 11:12:54 AM

03-27-2013

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Yes, the original tty was current loop, so send data and receive data are enough. Additional signalling is by break and long break, which are big zero's, as the line is left marking at the one level = current flowing. The 20 ma off hook current of the common POTS telephone is a tty relic!

Polarization is never an issue for ttl or rs232! RS232 +3-15 is zero, -3-15 is one. The idle data line marks at a one just like a long stop bit.

Parity costs 12.5%, is weak, so it need some checksum, but checksum can be sufficient alone. I think you said the cksum cost is 4/1024 or 1/256 or <.4%, so it's a winner, never mind the hassles of making 8 bit load data from a 7 bit payload.

So, it seems to be in the message layer. When you run good cases, does the checksum or anything change on duplicate runs? Is the checksum recognizable, some simple end around shift and half add? Some checksums shift more, some do not end around but when the upper byte is loaded makes some adjustment to prevent overflow on the next shift and half add (or add), like subtracting a right shifted version of the current sum from the sum.

Who manufactures the set top boxes? Do we have model numbers?

DGPickett

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LEARN ABOUT DEBIAN

shishi_authenticator_set_cksum

shishi_authenticator_set_cksum(3)				      shishi					 shishi_authenticator_set_cksum(3)

NAME

       shishi_authenticator_set_cksum - API function

SYNOPSIS

       #include <shishi.h>

       int shishi_authenticator_set_cksum(Shishi * handle, Shishi_asn1 authenticator, int32_t cksumtype, char * cksum, size_t cksumlen);

ARGUMENTS

       Shishi * handle
		   shishi handle as allocated by shishi_init().

       Shishi_asn1 authenticator
		   authenticator as allocated by shishi_authenticator().

       int32_t cksumtype
		   input checksum type to store in authenticator.

       char * cksum
		   input checksum data to store in authenticator.

       size_t cksumlen
		   size of input checksum data to store in authenticator.

DESCRIPTION

       Store  checksum value in authenticator.	A checksum is usually created by calling shishi_checksum() on some application specific data using
       the key from the ticket that is being used.  To save time, you may want to use shishi_authenticator_add_cksum() instead,  which	calculates
       the checksum and calls this function in one step.

RETURN VALUE

       Returns SHISHI_OK iff successful.

REPORTING BUGS

       Report bugs to <bug-shishi@gnu.org>.

COPYRIGHT

       Copyright (C) 2002-2010 Simon Josefsson.
       Copying	and  distribution  of  this file, with or without modification, are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO

       The full documentation for shishi is maintained as a Texinfo manual.  If the info and shishi programs are properly installed at your  site,
       the command

	      info shishi

       should give you access to the complete manual.

shishi								       1.0.1					 shishi_authenticator_set_cksum(3)