1 files changed, 151 insertions, 0 deletions
diff --git a/src/isode/psap/prim2real.c b/src/isode/psap/prim2real.c
new file mode 100644
index 000000000..b30d92a05
--- /dev/null
+++ b/src/isode/psap/prim2real.c
@@ -0,0 +1,151 @@
+/* prim2real.c - presentation element to real */
+
+#ifndef	lint
+static char *rcsid = "$Header$";
+#endif
+
+/* 
+ * $Header$
+ *
+ * Contributed by Julian Onions, Nottingham University.
+ * July 1989 - this stuff is awful. If you're going to use it seriously then
+ * write a machine specific version rather than any attempt at portability.
+ *
+ *
+ * $Log$
+ * Revision 1.1  1994/06/10 03:33:50  eichin
+ * autoconfed isode for kerberos work
+ *
+ * Revision 1.1  1994/06/01 00:38:04  eichin
+ * add psap too
+ *
+ * Revision 8.0  91/07/17  12:47:04  isode
+ * Release 7.0
+ * 
+ * 
+ */
+
+/*
+ *				  NOTICE
+ *
+ *    Acquisition, use, and distribution of this module and related
+ *    materials are subject to the restrictions of a license agreement.
+ *    Consult the Preface in the User's Manual for the full terms of
+ *    this agreement.
+ *
+ */
+
+
+/* LINTLIBRARY */
+
+#include "psap.h"
+
+/*  */
+
+static double decode_binary (), decode_decimal ();
+       
+double	prim2real (pe)
+register PE 	pe;
+{
+	if (pe -> pe_form != PE_FORM_PRIM)
+		return pe_seterr (pe, PE_ERR_PRIM, NOTOK);
+	if (pe -> pe_len == 0)
+		return 0.0;
+	if (pe -> pe_prim == NULLPED)
+		return pe_seterr (pe, PE_ERR_PRIM, NOTOK);
+		
+	if (pe -> pe_len > sizeof (double) + 1)
+		return pe_seterr (pe, PE_ERR_OVER, NOTOK);
+
+	pe -> pe_errno = PE_ERR_NONE;	/* in case it's -1 */
+
+	if ((*(pe -> pe_prim) & 0x80) == 0x80)
+		return decode_binary (pe);
+
+	switch (*(pe -> pe_prim) & PE_REAL_FLAGS) {
+	    case PE_REAL_DECENC:
+		return decode_decimal (pe);
+
+	    case PE_REAL_SPECENC:
+		if (pe -> pe_len > 1)
+			return pe_seterr (pe, PE_ERR_OVER, NOTOK);
+
+		switch (*(pe -> pe_prim)) {
+		    case PE_REAL_MINUSINF:
+			return HUGE;
+		    case PE_REAL_PLUSINF:
+			return -HUGE;
+		    default:
+			return pe_seterr (pe, PE_ERR_NOSUPP, NOTOK);
+		}
+	}
+	/* NOTREACHED */
+}
+
+/*  */
+
+static double decode_binary (pe)
+PE	pe;
+{
+	int	sign, base, factor;
+	int	exponent, i;
+	double	mantissa, di;
+	PElementData dp, ep;
+
+	dp = pe -> pe_prim;
+	sign = (*dp & PE_REAL_B_S) ?  -1 : 1;
+	switch (*dp & PE_REAL_B_BASE) {
+	    case PE_REAL_B_B2:
+		base = 2;
+		break;
+
+	    case PE_REAL_B_B8:
+		base = 8;
+		break;
+
+	    case PE_REAL_B_B16:
+		base = 16;
+		break;
+	    default:
+		return pe_seterr(pe, PE_ERR_NOSUPP, NOTOK);
+	}
+
+	factor = ((int)(*dp & PE_REAL_B_F)) >> 2;
+
+	exponent = (dp[1] & 0x80) ? (-1) : 0;
+	switch (*dp++ & PE_REAL_B_EXP) {
+	    case PE_REAL_B_EF3:
+		exponent = (exponent << 8) | (*dp++ & 0xff);
+		/* fall */
+	    case PE_REAL_B_EF2:
+		exponent = (exponent << 8) | (*dp++ & 0xff);
+		/* fall */
+	    case PE_REAL_B_EF1:
+		exponent = (exponent << 8) | (*dp++ & 0xff);
+		break;
+	    case PE_REAL_B_EF4:
+		i = *dp++ & 0xff;
+		if (i > sizeof(int))
+			return pe_seterr (pe, PE_ERR_OVER, NOTOK);
+		for (; i > 0; i--)
+			exponent = (exponent << 8) | (*dp++ & 0xff);
+		break;
+	}
+	for (di = 0.0, ep = pe -> pe_prim + pe -> pe_len; dp < ep;) {
+		di *= 1 << 8;	;
+		di += (int)(*dp++ & 0xff);
+	}
+	
+	mantissa = sign * di * (1 << factor);
+	return mantissa * pow ((double)base, (double)exponent);
+}
+
+/*  */
+
+static double decode_decimal (pe)
+PE	pe;
+{
+	/* sorry - don't have the standard ! */
+	return pe_seterr (pe, PE_ERR_NOSUPP, NOTOK);
+}
+