From 812922a639c8540d5ef78d9fcdbabd23d09d9025 Mon Sep 17 00:00:00 2001
From: Martin Peach <mrpeach@users.sourceforge.net>
Date: Wed, 13 Mar 2013 19:02:25 +0000
Subject: Two objects to convert between floats and their binary representation
 as bytes, so you can send floats through [comport] for example.

svn path=/trunk/externals/mrpeach/; revision=17064
---
 serializer/b2f.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 serializer/b2f.c

(limited to 'serializer/b2f.c')

diff --git a/serializer/b2f.c b/serializer/b2f.c
new file mode 100644
index 0000000..91d1096
--- /dev/null
+++ b/serializer/b2f.c
@@ -0,0 +1,88 @@
+/* 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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