1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2013. 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"
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;
}
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;
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;
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;
}
|
