1 /*
2 * %CopyrightBegin%
3 *
4 * Copyright Ericsson AB 1998-2016. All Rights Reserved.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 * %CopyrightEnd%
19 */
20 #include "eidef.h"
21 #include "eiext.h"
22 #include "putget.h"
23
24 #define abs(p) (((p)<0) ? -(p) : p)
25
26 /* long -> erl_integer */
27 /* note that this is the only place where data is stored Little Endian */
28
29 #ifndef EI_64BIT
ei_encode_long(char * buf,int * index,long p)30 int ei_encode_long(char *buf, int *index, long p)
31 {
32 char *s = buf + *index;
33 char *s0 = s;
34
35 if ((p < 256) && (p >= 0)) {
36 if (!buf) s += 2;
37 else {
38 put8(s,ERL_SMALL_INTEGER_EXT);
39 put8(s,(p & 0xff));
40 }
41 }
42 else if ((p <= ERL_MAX) && (p >= ERL_MIN)) {
43 /* FIXME: Non optimal, could use (p <= LONG_MAX) && (p >= LONG_MIN)
44 and skip next case */
45 if (!buf) s += 5;
46 else {
47 put8(s,ERL_INTEGER_EXT);
48 put32be(s,p);
49 }
50 }
51 else {
52 if (!buf) s += 7;
53 else {
54 put8(s,ERL_SMALL_BIG_EXT);
55 put8(s,4); /* len = four bytes */
56 put8(s, p < 0); /* save sign separately */
57 put32le(s, abs(p)); /* OBS: Little Endian, and p now positive */
58 }
59 }
60
61 *index += s-s0;
62
63 return 0;
64 }
65 #endif /* EI_64BIT */
66