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/* slipdec.c 20100513 Martin Peach */
/* decode a list of SLIP-encoded bytes */
#include "m_pd.h"
/* -------------------------- slipdec -------------------------- */
#ifndef _SLIPCODES
/* SLIP special character codes */
#define SLIP_END 0300 /* indicates end of packet */
#define SLIP_ESC 0333 /* indicates byte stuffing */
#define SLIP_ESC_END 0334 /* SLIP_ESC SLIP_ESC_END means SLIP_END data byte */
#define SLIP_ESC_ESC 0335 /* SLIP_ESC SLIP_ESC_ESC means SLIP_ESC data byte */
#define MAX_SLIP 1006 /* maximum SLIP packet size */
#define _SLIPCODES
#endif // _SLIPCODES
static t_class *slipdec_class;
typedef struct _slipdec
{
t_object x_obj;
t_outlet *x_slipdec_out;
t_outlet *x_status_out;
t_atom *x_slip_buf;
t_int x_slip_length;
t_int x_packet_index;
t_int x_valid_SLIP;
t_int x_esced;
t_int x_verbose;
} t_slipdec;
static void *slipdec_new(t_symbol *s, int argc, t_atom *argv);
static void slipdec_list(t_slipdec *x, t_symbol *s, int ac, t_atom *av);
static void slipdec_float(t_slipdec *x, t_float f);
static void slipdec_verbosity(t_slipdec *x, t_float f);
static void slipdec_free(t_slipdec *x);
void slipdec_setup(void);
static void *slipdec_new(t_symbol *s, int argc, t_atom *argv)
{
int i;
t_slipdec *x = (t_slipdec *)pd_new(slipdec_class);
x->x_slip_buf = (t_atom *)getbytes(sizeof(t_atom)*MAX_SLIP);
if(x->x_slip_buf == NULL)
{
error("slipdec: unable to allocate %lu bytes for x_slip_buf", (long)sizeof(t_atom)*MAX_SLIP);
return NULL;
}
/* init the slip buf atoms to float type */
for (i = 0; i < MAX_SLIP; ++i) x->x_slip_buf[i].a_type = A_FLOAT;
x->x_slipdec_out = outlet_new(&x->x_obj, &s_list);
x->x_status_out = outlet_new(&x->x_obj, &s_anything);
x->x_packet_index = 0;
x->x_valid_SLIP = 1;
return (x);
}
static void slipdec_list(t_slipdec *x, t_symbol *s, int ac, t_atom *av)
{
/* SLIP decode a list of bytes */
float f;
int i = 0, c;
/* x_slip_length will be non-zero if an incomplete packet is in the buffer */
if ((ac + x->x_slip_length) > MAX_SLIP)
{
pd_error (x, "slipdec_list: input packet longer than %d", MAX_SLIP);
x->x_slip_length = x->x_esced = x->x_packet_index = 0;
return;
}
/* for each byte in the packet, send the appropriate character sequence */
for(; ((i < ac) && (x->x_slip_length < MAX_SLIP)); ++i)
{
/* check each atom for byteness */
f = atom_getfloat(&av[i]);
c = (((int)f) & 0x0FF);
if (c != f)
{
/* abort, input list needs to be fixed before this is gonna wuk */
pd_error (x, "slipdec: input %d out of range [0..255]", f);
return;
}
if(SLIP_END == c)
{
/* If it's the beginning of a packet, ignore it */
if (0 == i) continue;
/* send the packet */
else break;
}
if (SLIP_ESC == c)
{
x->x_esced = 1;
continue;
}
if (1 == x->x_esced)
{
if (SLIP_ESC_END == c) c = SLIP_END;
else if (SLIP_ESC_ESC == c) c = SLIP_ESC;
else x->x_valid_SLIP = 0; /* not valid SLIP */
x->x_esced = 0;
}
/* Add the character to the list */
x->x_slip_buf[x->x_slip_length++].a_w.w_float = c;
}
if (0 != x->x_slip_length)
{
if(SLIP_END != c) x->x_valid_SLIP = 0;
outlet_float(x->x_status_out, x->x_valid_SLIP);
if (0 != x->x_valid_SLIP) outlet_list(x->x_slipdec_out, &s_list, x->x_slip_length, x->x_slip_buf);
x->x_slip_length = x->x_esced = x->x_packet_index = 0;
x->x_valid_SLIP = 1;
/* any remaining data in the list is ignored for now... */
if (i < ac) post("slipdec_list: dropped %d bytes after packet", ac-i);
}
}
static void slipdec_float(t_slipdec *x, t_float f)
{
/* SLIP decode a byte */
int c;
/* for each byte in the packet, send the appropriate character sequence */
/* check each atom for byteness */
c = (((int)f) & 0x0FF);
if (c != f)
{
/* abort, input list needs to be fixed before this is gonna wuk */
pd_error (x, "slipdec: input %d out of range [0..255]", f);
x->x_slip_length = x->x_esced = x->x_packet_index = 0;
x->x_valid_SLIP = 1;
return;
}
if(SLIP_END == c)
{
if (x->x_verbose) post ("slipdec_float: SLIP_END packet index is %d", x->x_packet_index);
/* If it's the beginning of a packet, ignore it */
if (0 == x->x_packet_index) return;
/* send the packet */
else
{
if (x->x_verbose) post ("slipdec_float: end of packet");
outlet_float(x->x_status_out, x->x_valid_SLIP);
if ((0 != x->x_slip_length) && (0 != x->x_valid_SLIP))
outlet_list(x->x_slipdec_out, &s_list, x->x_slip_length, x->x_slip_buf);
x->x_slip_length = x->x_esced = x->x_packet_index = 0;
x->x_valid_SLIP = 1;
return;
}
}
if (SLIP_ESC == c)
{
if (x->x_verbose) post ("slipdec_float: SLIP_ESC %f = %d", f, c);
x->x_esced = 1;
return;
}
if (1 == x->x_esced)
{
if (SLIP_ESC_END == c) c = SLIP_END;
else if (SLIP_ESC_ESC == c) c = SLIP_ESC;
else x->x_valid_SLIP = 0; /* not valid SLIP */
if (x->x_verbose) post ("slipdec_float: ESCED %f = %d", f, c);
x->x_esced = 0;
}
/* Add the character to the list */
if (0 == x->x_packet_index++) x->x_slip_length = 0;
if (x->x_slip_length < MAX_SLIP)
{
x->x_slip_buf[x->x_slip_length++].a_w.w_float = c;
}
else
{
pd_error (x, "slipdec: input packet longer than %d", x->x_slip_length);
x->x_slip_length = x->x_esced = x->x_packet_index = 0;
}
}
static void slipdec_verbosity(t_slipdec *x, t_float f)
{
x->x_verbose = (0 != f)?1:0;
}
static void slipdec_free(t_slipdec *x)
{
if (x->x_slip_buf != NULL) freebytes((void *)x->x_slip_buf, sizeof(t_atom)*MAX_SLIP);
}
void slipdec_setup(void)
{
slipdec_class = class_new(gensym("slipdec"),
(t_newmethod)slipdec_new, (t_method)slipdec_free,
sizeof(t_slipdec), 0, A_GIMME, 0);
class_addlist(slipdec_class, slipdec_list);
class_addfloat(slipdec_class, slipdec_float);
class_addmethod(slipdec_class, (t_method)slipdec_verbosity, gensym("verbosity"), A_FLOAT, 0);
class_sethelpsymbol(slipdec_class, gensym("slipenc")); /* use slipenc-help.pd */
}
/* fin slipdec.c*/
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