diff options
Diffstat (limited to 'slipdec')
| -rw-r--r-- | slipdec/slipdec.c | 45 |
1 files changed, 32 insertions, 13 deletions
diff --git a/slipdec/slipdec.c b/slipdec/slipdec.c index d09e34f..5949b84 100644 --- a/slipdec/slipdec.c +++ b/slipdec/slipdec.c @@ -1,4 +1,4 @@ -/* slipdec.c 20070711 Martin Peach */
+/* slipdec.c 20100513 Martin Peach */
/* decode a list of SLIP-encoded bytes */
#include "m_pd.h"
@@ -58,10 +58,17 @@ 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, c, esced = 0, isSLIP = 1;
-
+ 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 = x->x_slip_length = 0; ((i < ac) && (x->x_slip_length < MAX_SLIP)); ++i)
+ for(; ((i < ac) && (x->x_slip_length < MAX_SLIP)); ++i)
{
/* check each atom for byteness */
f = atom_getfloat(&av[i]);
@@ -81,24 +88,28 @@ static void slipdec_list(t_slipdec *x, t_symbol *s, int ac, t_atom *av) }
if (SLIP_ESC == c)
{
- esced = 1;
+ x->x_esced = 1;
continue;
}
- if (1 == esced)
+ if (1 == x->x_esced)
{
if (SLIP_ESC_END == c) c = SLIP_END;
else if (SLIP_ESC_ESC == c) c = SLIP_ESC;
- else isSLIP = 0; /* not valid SLIP */
- esced = 0;
+ 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) isSLIP = 0;
- outlet_float(x->x_status_out, isSLIP);
- outlet_list(x->x_slipdec_out, &s_list, x->x_slip_length, x->x_slip_buf);
+ 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); }
}
@@ -127,7 +138,7 @@ static void slipdec_float(t_slipdec *x, t_float f) {
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)
+ 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;
@@ -150,7 +161,15 @@ static void slipdec_float(t_slipdec *x, t_float f) }
/* Add the character to the list */
if (0 == x->x_packet_index++) x->x_slip_length = 0;
- x->x_slip_buf[x->x_slip_length++].a_w.w_float = c;
+ 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)
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