#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <math.h>
#include <stdarg.h>
#include <stdbool.h>
#include <inttypes.h>
return 0;
}
+/*
+ * Deserialize an IEEE 754 binary32 value in "little endian" (for whatever
+ * that term is worth in this context). That is, when interpreted as a little
+ * endian 32-bit unsigned integer: bit 31 is the sign, bits 30-23 are the
+ * (biased) exponent, and bits 22-0 are the encoded part of the significand.
+ *
+ * The implementation is designed to be agnostic of the platform's actual
+ * float type, but the conversion may be lossy if "float" is not itself a
+ * binary32 format. NaN payloads are not preserved.
+ */
+static float unpack_binary32_le(const unsigned char *buf)
+{
+ unsigned long raw;
+ long significand;
+ int exponent;
+ float result;
+
+ raw = unpack_32_le(buf);
+ exponent = (raw & 0x7f800000) >> 23;
+ significand = (raw & 0x007fffff) >> 0;
+
+ switch (exponent) {
+ case 255:
+ result = significand ? NAN : INFINITY;
+ break;
+ default:
+ significand |= 0x00800000;
+ /* fall through */
+ case 0:
+ result = ldexpf(significand, exponent-126-24);
+ }
+
+ return copysignf(result, raw & 0x80000000 ? -1 : 1);
+}
+
static unsigned long deserialize_property(UObject *uo, struct prop_head *head)
{
struct u_object_priv *priv = U_OBJECT_GET_PRIV(uo);
case PROPERTY_END:
break;
case PROPERTY_BYTE:
- if (priv->nbuf-len < 1)
+ if (head->size != 1 || priv->nbuf-len < head->size)
return 0;
g_value_init(&val, G_TYPE_UCHAR);
g_value_set_uchar(&val, priv->buf[len]);
g_object_set_property(G_OBJECT(uo), head->prop_name, &val);
break;
case PROPERTY_INTEGER:
- if (priv->nbuf-len < 4)
+ if (head->size != 4 || priv->nbuf-len < head->size)
return 0;
g_value_init(&val, G_TYPE_ULONG);
g_value_set_ulong(&val, unpack_32_le(priv->buf+len));
g_object_set_property(G_OBJECT(uo), head->prop_name, &val);
break;
case PROPERTY_BOOLEAN:
+ if (head->size != 0)
+ return 0;
g_value_init(&val, G_TYPE_BOOLEAN);
g_value_set_boolean(&val, head->tag_msb);
g_object_set_property(G_OBJECT(uo), head->prop_name, &val);
return 0;
g_object_set_property(G_OBJECT(uo), head->prop_name, &val);
break;
+ case PROPERTY_FLOAT:
+ if (head->size != 4 || priv->nbuf-len < head->size)
+ return 0;
+ g_value_init(&val, G_TYPE_FLOAT);
+ g_value_set_float(&val, unpack_binary32_le(priv->buf+len));
+ g_object_set_property(G_OBJECT(uo), head->prop_name, &val);
+ break;
default:
- fprintf(stderr, "Unhandled property type %x\n",
- (unsigned)head->type);
+ u_warn(uo, "%s: unsupported property type %u",
+ head->prop_name, (unsigned)head->type);
}
len += head->size;