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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2020. 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"
static int decode_list_ext_iodata(const char *buf, int* index,
int *szp, unsigned char **pp);
static void decode_string(const char *buf, int* index,
int *szp, unsigned char **pp);
int ei_decode_iodata(const char *buf, int* index, int *szp, char *out_buf)
{
int type, len;
if (szp)
*szp = 0;
if (ei_get_type(buf, index, &type, &len) < 0)
return -1;
/* Top level of iodata is either a list or a binary... */
switch (type) {
case ERL_BINARY_EXT: {
long llen;
if (ei_decode_binary(buf, index, out_buf, &llen) < 0)
return -1;
if (llen != (long) len)
return -1; /* general 64-bit issue with ei api... */
if (szp)
*szp += len;
return 0;
}
case ERL_STRING_EXT: {
unsigned char *p = (unsigned char *) out_buf;
decode_string(buf, index, szp, p ? &p : NULL);
return 0;
}
case ERL_NIL_EXT:
return ei_decode_list_header(buf, index, NULL);
case ERL_LIST_EXT: {
unsigned char *ptr = (unsigned char *) out_buf;
len = 0;
return decode_list_ext_iodata(buf, index,
szp ? szp : &len,
ptr ? &ptr : NULL);
}
default:
return -1; /* Not a list nor a binary... */
}
}
static int decode_list_ext_iodata(const char *buf, int* index,
int *szp, unsigned char **pp)
{
int type, len, i, conses;
if (ei_decode_list_header(buf, index, &conses) < 0)
return -1;
for (i = 0; i <= conses; i++) {
if (ei_get_type(buf, index, &type, &len) < 0)
return -1;
switch (type) {
case ERL_SMALL_INTEGER_EXT:
case ERL_INTEGER_EXT: {
long val;
if (i == conses)
return -1; /* int not allowed in cdr of cons */
if (ei_decode_long(buf, index, &val) < 0)
return -1;
if (val < 0 || 255 < val)
return -1;
if (pp)
*((*pp)++) = (unsigned char) val;
*szp += 1;
break;
}
case ERL_BINARY_EXT: {
void *p = pp ? *pp : NULL;
long llen;
if (ei_decode_binary(buf, index, p, &llen) < 0)
return -1;
if (llen != (long) len)
return -1; /* general 64-bit issue with ei api... */
if (pp)
*pp += len;
*szp += len;
break;
}
case ERL_STRING_EXT:
decode_string(buf, index, szp, pp);
break;
case ERL_LIST_EXT:
if (decode_list_ext_iodata(buf, index, szp, pp) < 0)
return -1;
break;
case ERL_NIL_EXT:
if (ei_decode_list_header(buf, index, NULL) < 0)
return -1;
break;
default:
/* Not a list, a binary, nor a byte sized integer... */
return -1;
}
}
return 0;
}
static void
decode_string(const char *buf, int* index, int *szp, unsigned char **pp)
{
/*
* ei_decode_string() null-terminates the string
* which we do not want, so we decode it ourselves
* here instead...
*/
int len;
char *s = (char *) buf + *index;
char *s0 = s;
/* ASSERT(*s == ERL_STRING_EXT); */
s++;
len = get16be(s);
if (pp) {
memcpy(*pp, s, len);
*pp += len;
}
if (szp)
*szp += len;
s += len;
*index += s-s0;
}
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