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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_atom(const char *buf, int *index, char *p)
{
return ei_decode_atom_as(buf, index, p, MAXATOMLEN, ERLANG_LATIN1, NULL, NULL);
}
int ei_decode_atom_as(const char *buf, int *index, char* p, int destlen,
erlang_char_encoding want_enc,
erlang_char_encoding* was_encp,
erlang_char_encoding* res_encp)
{
const char *s = buf + *index;
const char *s0 = s;
int len;
erlang_char_encoding got_enc;
switch (get8(s)) {
case ERL_ATOM_EXT:
len = get16be(s);
got_enc = ERLANG_LATIN1;
break;
case ERL_SMALL_ATOM_EXT:
len = get8(s);
got_enc = ERLANG_LATIN1;
break;
case ERL_ATOM_UTF8_EXT:
len = get16be(s);
got_enc = ERLANG_UTF8;
break;
case ERL_SMALL_ATOM_UTF8_EXT:
len = get8(s);
got_enc = ERLANG_UTF8;
break;
default:
return -1;
}
if ((want_enc & got_enc) || want_enc == ERLANG_ASCII) {
int i, found_non_ascii = 0;
if (len >= destlen)
return -1;
for (i=0; i<len; i++) {
if (s[i] & 0x80) found_non_ascii = 1;
if (p) p[i] = s[i];
}
if (p) p[len] = 0;
if (want_enc == ERLANG_ASCII && found_non_ascii) {
return -1;
}
if (res_encp) {
*res_encp = found_non_ascii ? got_enc : ERLANG_ASCII;
}
}
else {
int plen = (got_enc == ERLANG_LATIN1) ?
latin1_to_utf8(p, s, len, destlen-1, res_encp) :
utf8_to_latin1(p, s, len, destlen-1, res_encp);
if (plen < 0) return -1;
if (p) p[plen] = 0;
}
if (was_encp) {
*was_encp = got_enc;
}
s += len;
*index += s-s0;
return 0;
}
#ifdef HAVE_UNALIGNED_WORD_ACCESS
#if SIZEOF_VOID_P == SIZEOF_LONG
typedef unsigned long AsciiWord;
#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
typedef unsigned long long AsciiWord;
#else
# error "Uknown word type"
#endif
#if SIZEOF_VOID_P == 4
# define ASCII_CHECK_MASK ((AsciiWord)0x80808080U)
#elif SIZEOF_VOID_P == 8
# define ASCII_CHECK_MASK ((AsciiWord)0x8080808080808080U)
#endif
static int ascii_fast_track(char* dst, const char* src, int slen, int destlen)
{
const AsciiWord* src_word = (AsciiWord*) src;
const AsciiWord* const src_word_end = src_word + (slen / sizeof(AsciiWord));
if (destlen < slen)
return 0;
if (dst) {
AsciiWord* dst_word = (AsciiWord*)dst;
while (src_word < src_word_end) {
if ((*src_word & ASCII_CHECK_MASK) != 0)
break;
*dst_word++ = *src_word++;
}
}
else {
while (src_word < src_word_end) {
if ((*src_word & ASCII_CHECK_MASK) != 0)
break;
src_word++;
}
}
return (char*)src_word - src;
}
#endif /* HAVE_UNALIGNED_WORD_ACCESS */
int utf8_to_latin1(char* dst, const char* src, int slen, int destlen,
erlang_char_encoding* res_encp)
{
const char* const dst_start = dst;
const char* const dst_end = dst + destlen;
int found_non_ascii = 0;
#ifdef HAVE_UNALIGNED_WORD_ACCESS
{
int aft = ascii_fast_track(dst, src, slen, destlen);
src += aft;
slen -= aft;
dst += aft;
}
#endif
while (slen > 0) {
if (dst >= dst_end) return -1;
if ((src[0] & 0x80) == 0) {
if (dst_start) {
*dst = *src;
}
++dst;
++src;
--slen;
}
else if (slen > 1 &&
(src[0] & 0xFE) == 0xC2 &&
(src[1] & 0xC0) == 0x80) {
if (dst_start) {
*dst = (char) ((src[0] << 6) | (src[1] & 0x3F));
}
++dst;
src += 2;
slen -= 2;
found_non_ascii = 1;
}
else return -1;
}
if (res_encp) {
*res_encp = found_non_ascii ? ERLANG_LATIN1 : ERLANG_ASCII;
}
return dst - dst_start;
}
int latin1_to_utf8(char* dst, const char* src, int slen, int destlen,
erlang_char_encoding* res_encp)
{
const char* const src_end = src + slen;
const char* const dst_start = dst;
const char* const dst_end = dst + destlen;
int found_non_ascii = 0;
#ifdef HAVE_UNALIGNED_WORD_ACCESS
{
int aft = ascii_fast_track(dst, src, slen, destlen);
dst += aft;
src += aft;
}
#endif
while (src < src_end) {
if (dst >= dst_end) return -1;
if ((src[0] & 0x80) == 0) {
if (dst_start) {
*dst = *src;
}
++dst;
}
else {
if (dst_start) {
unsigned char ch = *src;
dst[0] = 0xC0 | (ch >> 6);
dst[1] = 0x80 | (ch & 0x3F);
}
dst += 2;
found_non_ascii = 1;
}
++src;
}
if (res_encp) {
*res_encp = found_non_ascii ? ERLANG_UTF8 : ERLANG_ASCII;
}
return dst - dst_start;
}
int ei_internal_get_atom(const char** bufp, char* p,
erlang_char_encoding* was_encp)
{
int ix = 0;
if (ei_decode_atom_as(*bufp, &ix, p, MAXATOMLEN_UTF8, ERLANG_UTF8, was_encp, NULL) < 0)
return -1;
*bufp += ix;
return 0;
}
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