/usr/lib/pd/extra/slip/slipdec-help.pd is in pd-slip 0.1~svn17542-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #N canvas 1 53 901 442 10;
#X obj 388 325 print decoded;
#X msg 319 159 192 192 192 192 192;
#X floatatom 339 182 5 0 0 0 - - -;
#X obj 382 238 cnv 15 60 30 empty empty empty 20 12 0 14 -4034 -66577
0;
#X text -57 298 The motivation behind SLIP is the need to determine
the boundaries of a packet when it is received one byte at a time \,
as with a serial channel. Bytes are integers between 0 and 255;
#X msg 185 25 verbosity \$1;
#X obj 185 6 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0 1
;
#X text -57 355 SLIP (RFC 1055) is a simple encoding that prefixes
each packet with 192 \, and replaces 192s inside the packet with 219
followed by 220 Any 219 will be replaced with 219 and 221 The packet
ends with 192;
#X text 443 160 Null packets are invisible;
#X obj 427 274 print valid;
#X text -57 193 Note that the SLIP specification limits the maximum
packet size to 1006...;
#X obj 388 245 slipdec;
#X text -57 221 ...but a float argument to slipdec or slipenc will
set another maximum packet size;
#X msg 229 69 192 \, 1.33 \, 192;
#X text 335 45 This should give 1 192;
#X text 321 69 Only bytes are permitted;
#X msg 275 115 192 219 5 6 7 192;
#X msg 253 93 1 43 5 6 7 192;
#X text 348 92 Missing 192 at start is OK;
#X text -58 139 [slipdec];
#X text 548 404 Author: Martin Peach \, 2010/10/01;
#X msg 205 45 192 1 \, 219 \, 220 \, 192;
#X msg 297 137 1 25 5 6 7;
#X text -57 257 Input can be any combination of float and list of floats
as long as they are integers on [0...255];
#X text 385 115 Bad escapes are invalid;
#X text 368 136 Unterminated input will be accumulated until end is
received;
#X text 636 368 See also:;
#X obj 695 370 slipenc;
#X text -58 153 Decodes bytes from SLIP to raw. Useful for receiving
OSC via [comport].;
#X text 427 290 Right outlet is one whenever a valid packet is output
\, zero if packet could not be decoded (bad packets are not output).
;
#X text 389 341 Left outlet gives lists of decoded bytes whenever valid
= 1;
#X text 267 24 Verbosity might be useful if things don't seem to be
working;
#N canvas 500 267 494 344 META 0;
#X text 12 155 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2 or later;
#X text 12 135 AUTHOR Martin Peach;
#X text 12 5 KEYWORDS control conversion;
#X text 12 46 DESCRIPTION decode bytes from SLIP to raw. Useful for
receiving OSC via [comport];
#X text 12 75 INLET_0 float list verbosity;
#X text 12 95 OUTLET_0 anything;
#X text 12 115 OUTLET_1 float;
#X restore 775 403 pd META;
#X connect 1 0 11 0;
#X connect 2 0 11 0;
#X connect 5 0 11 0;
#X connect 6 0 5 0;
#X connect 11 0 0 0;
#X connect 11 1 9 0;
#X connect 13 0 11 0;
#X connect 16 0 11 0;
#X connect 17 0 11 0;
#X connect 21 0 11 0;
#X connect 22 0 11 0;
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