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/* b2f.c MP 20130313 */
/* Convert a list of 4 bytes to a Pd float */
#include "m_pd.h"
#include <string.h>
typedef struct _b2f
{
t_object x_obj;
t_outlet *x_out;
} t_b2f;
static t_class *b2f_class;
void b2f_setup(void);
static void *b2f_new(t_symbol *s, int argc, t_atom *argv);
static void b2f_free(t_b2f *x);
static void b2f_list(t_b2f *x, t_symbol *s, int argc, t_atom *argv);
union fbuf
{
t_float f;
unsigned char b[4];
};
static void b2f_list(t_b2f *x, t_symbol *s, int argc, t_atom *argv)
{
int i, d;
union fbuf buf;
//post("b2f_list: s is %s, argc is %d", s->s_name, argc);
if (0 != strncmp("list", s->s_name, 4))
{
post("b2f_list: not a list of floats");
return;
}
if (argc != 4)
{
post("b2f_list: need 4 floats");
return;
}
for (i = 0; i < 4; ++i)
{
if (argv[i].a_type != A_FLOAT)
{
post("b2f_list: list element %d is not a float", i);
return;
}
d = argv[i].a_w.w_float;
if (d != argv[i].a_w.w_float)
{
post("b2f_list: list element %d is not an integer", i);
return;
}
if (d < 0 || d > 255)
{
post("b2f_list: list element %d is not an integer on [0..255]", i);
return;
}
buf.b[i] = d;
}
outlet_float(x->x_out, buf.f);
}
static void b2f_free(t_b2f *x)
{
return;
}
static void *b2f_new(t_symbol *s, int argc, t_atom *argv)
{
t_b2f *x;
x = (t_b2f *)pd_new(b2f_class);
if (x == NULL) return (x);
x->x_out = outlet_new((t_object *)x, &s_float);
return (x);
}
void b2f_setup(void)
{
b2f_class = class_new(gensym("b2f"),
(t_newmethod)b2f_new,
(t_method)b2f_free,
sizeof(t_b2f), 0, 0); /* no arguments */
class_addlist(b2f_class, b2f_list);
}
/* end b2f.c */
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