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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/erl_interface/src/encode/encode_longlong.c
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The R13B03 release.OTP_R13B03
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-rw-r--r--lib/erl_interface/src/encode/encode_longlong.c103
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diff --git a/lib/erl_interface/src/encode/encode_longlong.c b/lib/erl_interface/src/encode/encode_longlong.c
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+#include "eidef.h"
+#include "eiext.h"
+#include "putget.h"
+#include "ei_x_encode.h"
+
+#define abs(p) (((p)<0) ? -(p) : p)
+
+/* long -> erl_integer */
+/* note that this is the only place where data is stored Little Endian */
+
+/*
+ * For some 64 bit operations on some operating systems code
+ * compiled with GNU cc depends on "libgcc" for some 64 bit
+ * operations missing in hardware (or because of gcc bugs).
+ * If user code was linked together with the ei lib
+ * using other linkers than GNU ld this may cause problems.
+ * We moved ei_x_encode_longlong() here from "ei_x_encode.c"
+ * to limit this problem to users that actually use the ei
+ * longlong operations, not all ei_x users.
+ */
+int ei_x_encode_longlong(ei_x_buff* x, EI_LONGLONG n)
+{
+ int i = x->index;
+ ei_encode_longlong(NULL, &i, n);
+ if (!x_fix_buff(x, i))
+ return -1;
+ return ei_encode_longlong(x->buff, &x->index, n);
+}
+
+#ifdef EI_64BIT
+int ei_encode_long(char *buf, int *index, long p)
+{
+ return ei_encode_longlong(buf, index, p);
+}
+#endif
+
+int ei_encode_longlong(char *buf, int *index, EI_LONGLONG p)
+{
+ char *s = buf + *index;
+ char *s0 = s;
+
+ if ((p < 256) && (p >= 0)) {
+ if (!buf) s += 2;
+ else {
+ put8(s,ERL_SMALL_INTEGER_EXT);
+ put8(s,(p & 0xff));
+ }
+ } else if ((p <= ERL_MAX) && (p >= ERL_MIN)) {
+ /* FIXME: Non optimal, could use (p <= LONG_MAX) && (p >= LONG_MIN)
+ and skip next case */
+ if (!buf) s += 5;
+ else {
+ put8(s,ERL_INTEGER_EXT);
+ put32be(s,p);
+ }
+ } else {
+ /* We know 28-64 bits needed, i.e four to eight bytes */
+ EI_ULONGLONG up = abs(p); /* FIXME name uabs(x) not to confuse with abs */
+ if (buf) {
+ char *arityp;
+ int arity = 0;
+
+ put8(s,ERL_SMALL_BIG_EXT);
+ arityp = s++; /* fill in later */
+ put8(s, p < 0); /* save sign separately */
+ while (up) {
+ *s++ = up & 0xff; /* take lowest byte */
+ up >>= 8; /* shift unsigned */
+ arity++;
+ }
+ put8(arityp,arity);
+ } else {
+ s += 3; /* Type, arity and sign */
+ while (up) {
+ s++; /* take lowest byte */
+ up >>= 8; /* shift unsigned */
+ }
+ }
+ }
+
+ *index += s-s0;
+
+ return 0;
+}
+