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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_big.c
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The R13B03 release.OTP_R13B03
Diffstat (limited to 'lib/erl_interface/src/encode/encode_big.c')
-rw-r--r--lib/erl_interface/src/encode/encode_big.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/lib/erl_interface/src/encode/encode_big.c b/lib/erl_interface/src/encode/encode_big.c
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 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 <string.h>
+#include "eidef.h"
+#include "eiext.h"
+#include "putget.h"
+#include "ei_x_encode.h"
+
+int ei_encode_big(char *buf, int *index, erlang_big* big) {
+ unsigned char *s = (unsigned char *)buf + *index;
+ unsigned char *s0 = s;
+ unsigned int digit_bytes = big->arity;
+ unsigned int n = (digit_bytes+1)/2;
+
+ if (digit_bytes < 256) {
+ if (buf) {
+ put8(s, ERL_SMALL_BIG_EXT);
+ put8(s, digit_bytes);
+ } else {
+ s += 2;
+ }
+ } else {
+ if (buf) {
+ put8(s, ERL_LARGE_BIG_EXT);
+ put32be(s, digit_bytes);
+ } else {
+ s += 5;
+ }
+ }
+
+ if (buf) {
+ int i;
+ unsigned char hi, lo;
+ unsigned short *dt = big->digits;
+ put8(s, big->is_neg);
+
+ for (i = 0; i < n; ++i) {
+
+ hi = (unsigned char) (dt[i] >> 8);
+ lo = (unsigned char) (dt[i]);
+
+ s[i*2] = lo;
+ if ((i*2 + 1) < digit_bytes) {
+ s[i*2 + 1] = hi;
+ }
+ }
+
+ } else {
+ s ++; /* skip sign bit */
+ }
+
+ s += digit_bytes;
+
+ *index += s-s0;
+
+ return 0;
+}
+
+int ei_x_encode_big(ei_x_buff* x, erlang_big* big) {
+ int i = x->index;
+
+ ei_encode_big(NULL, &i, big);
+ if (!x_fix_buff(x, i))
+ return -1;
+ return ei_encode_big(x->buff, &x->index, big);
+}
+