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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#include <string.h>
#include "eidef.h"
#include "eiext.h"
#include "putget.h"
static int utf8_to_latin1(char* dest, const char* source, unsigned len);
int ei_decode_atom(const char *buf, int *index, char *p)
{
const char *s = buf + *index;
const char *s0 = s;
int len;
switch (get8(s)) {
case ERL_ATOM_EXT:
len = get16be(s);
if (len > MAXATOMLEN) return -1;
if (p) {
memmove(p,s,len);
p[len] = (char)0;
}
break;
case ERL_SMALL_ATOM_EXT:
len = get8(s);
if (p) {
memmove(p,s,len);
p[len] = (char)0;
}
break;
case ERL_UNICODE_ATOM_EXT:
len = get16be(s);
if (len > 2*MAXATOMLEN) return -1;
if (p && utf8_to_latin1(p, s, len) < 0) return -1;
break;
default:
return -1;
}
s += len;
*index += s-s0;
return 0;
}
int ei_internal_get_atom(const char** bufp, char* p)
{
int ix = 0;
if (ei_decode_atom(*bufp, &ix, p) < 0) return -1;
*bufp += ix;
return 0;
}
static int utf8_to_latin1(char* dest, const char* source, unsigned slen)
{
const char* dest_end = dest + MAXATOMLEN - 1;
while (slen > 0 && dest < dest_end) {
if ((source[0] & 0x80) == 0) {
*dest++ = *source++;
--slen;
}
else if (slen > 1 &&
(source[0] & 0xFE) == 0xC2 &&
(source[1] & 0xC0) == 0x80) {
*dest++ = (char) ((source[0] << 6) | (source[1] & 0x3F));
source += 2;
slen -= 2;
}
else return -1;
}
*dest = 0;
return 0;
}
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