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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2016. 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 <string.h>
#include "eidef.h"
#include "eiext.h"
#include "putget.h"
/* FIXME fix or document that special requirements on
the in data.... */
int ei_decode_string(const char *buf, int *index, char *p)
{
const char *s = buf + *index;
const char *s0 = s;
int len;
int i;
int etype;
switch (get8(s)) {
case ERL_STRING_EXT:
len = get16be(s);
if (p) {
memmove(p,s,len);
p[len] = (char)0;
}
s += len;
break;
case ERL_LIST_EXT:
/* Really long strings are represented as lists of small integers.
* We don't know in advance if the whole list is small integers,
* but we decode as much as we can, exiting early if we run into a
* non-character in the list.
*/
len = get32be(s);
if (p) {
for (i=0; i<len; i++) {
if ((etype = get8(s)) != ERL_SMALL_INTEGER_EXT) {
p[i] = (char)0;
return -1;
}
p[i] = get8(s);
}
p[i] = (char)0;
}
else {
for (i=0; i<len; i++) {
if ((etype = get8(s)) != ERL_SMALL_INTEGER_EXT) return -1;
s++;
}
}
/* Check NIL tail */
if ((etype = get8(s)) != ERL_NIL_EXT) return -1;
break;
case ERL_NIL_EXT:
if (p) p[0] = (char)0;
break;
default:
return -1;
}
*index += s-s0;
return 0;
}
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