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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"
int ei_decode_binary(const char *buf, int *index, void *p, long *lenp)
{
const char *s = buf + *index;
const char *s0 = s;
long len;
if (get8(s) != ERL_BINARY_EXT) return -1;
len = get32be(s);
if (p) memmove(p,s,len);
s += len;
if (lenp) *lenp = len;
*index += s-s0;
return 0;
}
int ei_decode_bitstring(const char *buf, int *index, void *p, size_t plen,
size_t *bitsp)
{
const char *s = buf + *index;
const char *s0 = s;
unsigned long len;
unsigned char last_bits;
const unsigned char tag = get8(s);
if (tag == ERL_BINARY_EXT) {
long bytes;
int ret = ei_decode_binary(buf, index, p, &bytes);
if (bitsp)
*bitsp = (size_t)bytes * 8;
return ret;
}
if (tag != ERL_BIT_BINARY_EXT)
return -1;
len = get32be(s);
last_bits = get8(s);
if (len > plen || ((last_bits==0) != (len==0)) || last_bits > 8)
return -1;
if (p)
memcpy(p, s, len);
s += len;
if (bitsp)
*bitsp = (len == 0) ? 0 : ((len-1) * 8) + last_bits;
*index += s-s0;
return 0;
}
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