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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2002-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "eidef.h"
#include "eiext.h"
#include "putget.h"
#ifdef EI_64BIT
int ei_decode_ulong(const char *buf, int *index, unsigned long *p)
{
return ei_decode_ulonglong(buf, index, (EI_ULONGLONG *)p);
}
#endif
int ei_decode_ulonglong(const char *buf, int *index, EI_ULONGLONG *p)
{
const char *s = buf + *index;
const char *s0 = s;
EI_ULONGLONG n;
int arity;
int sn;
switch (get8(s)) {
case ERL_SMALL_INTEGER_EXT:
n = get8(s);
break;
case ERL_INTEGER_EXT:
sn = get32be(s);
if (sn < 0) return -1;
n = (EI_ULONGLONG)sn;
break;
case ERL_SMALL_BIG_EXT:
arity = get8(s);
goto decode_big;
case ERL_LARGE_BIG_EXT:
arity = get32be(s);
decode_big:
{
int sign = get8(s);
int i;
n = 0;
if (sign) return -1;
/* Little Endian, up to four bytes always fit into unsigned long */
for (i = 0; i < arity; i++) {
if (i < 8) {
n |= ((EI_ULONGLONG)get8(s)) << (i * 8);
} else if (get8(s) != 0) {
return -1; /* All but first byte have to be 0 */
}
}
}
break;
default:
return -1;
}
if (p) *p = n;
*index += s-s0;
return 0;
}
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