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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* %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 <limits.h>
#include "eidef.h"
#include "eiext.h"
#include "putget.h"
static int verify_ascii_atom(const char* src, int slen);
static int verify_utf8_atom(const char* src, int slen);
int ei_encode_atom(char *buf, int *index, const char *p)
{
size_t len = strlen(p);
if (len >= MAXATOMLEN)
len = MAXATOMLEN - 1;
return ei_encode_atom_len_as(buf, index, p, len, ERLANG_LATIN1, ERLANG_LATIN1);
}
int ei_encode_atom_len(char *buf, int *index, const char *p, int len)
{
/* This function is documented to truncate at MAXATOMLEN (256) */
if (len >= MAXATOMLEN)
len = MAXATOMLEN - 1;
return ei_encode_atom_len_as(buf, index, p, len, ERLANG_LATIN1, ERLANG_LATIN1);
}
int ei_encode_atom_as(char *buf, int *index, const char *p,
erlang_char_encoding from_enc,
erlang_char_encoding to_enc)
{
return ei_encode_atom_len_as(buf, index, p, strlen(p), from_enc, to_enc);
}
int ei_encode_atom_len_as(char *buf, int *index, const char *p, int len,
erlang_char_encoding from_enc,
erlang_char_encoding to_enc)
{
char *s = buf + *index;
char *s0 = s;
int offs;
if (len >= MAXATOMLEN && (from_enc & (ERLANG_LATIN1|ERLANG_ASCII))) {
return -1;
}
switch(to_enc) {
case ERLANG_LATIN1:
if (buf) {
put8(s,ERL_ATOM_EXT);
switch (from_enc) {
case ERLANG_UTF8:
len = utf8_to_latin1(s+2, p, len, MAXATOMLEN-1, NULL);
if (len < 0) return -1;
break;
case ERLANG_ASCII:
if (verify_ascii_atom(p, len) < 0) return -1;
memcpy(s+2, p, len);
break;
case ERLANG_LATIN1:
memcpy(s+2, p, len);
break;
default:
return -1;
}
put16be(s,len);
}
else {
s += 3;
if (from_enc == ERLANG_UTF8) {
len = utf8_to_latin1(NULL, p, len, MAXATOMLEN-1, NULL);
if (len < 0) return -1;
} else if (from_enc == ERLANG_ASCII)
if (verify_ascii_atom(p, len) < 0) return -1;
}
break;
case ERLANG_UTF8:
offs = 1 + 1;
switch (from_enc) {
case ERLANG_LATIN1:
if (len >= 256/2) offs++;
len = latin1_to_utf8((buf ? s+offs : NULL), p, len, MAXATOMLEN_UTF8-1, NULL);
break;
case ERLANG_ASCII:
if (verify_ascii_atom(p, len) < 0) return -1;
if (buf) memcpy(s+offs,p,len);
break;
case ERLANG_UTF8:
if (len >= 256) offs++;
if (verify_utf8_atom(p, len) < 0) return -1;
if (buf) memcpy(s+offs,p,len);
break;
default:
return -1;
}
if (buf) {
if (offs == 2) {
put8(s, ERL_SMALL_ATOM_UTF8_EXT);
put8(s, len);
}
else {
put8(s, ERL_ATOM_UTF8_EXT);
put16be(s, len);
}
}
else s+= offs;
break;
default:
return -1;
}
s += len;
*index += s-s0;
return 0;
}
int
ei_internal_put_atom(char** bufp, const char* p, int slen,
erlang_char_encoding to_enc)
{
int ix = 0;
if (ei_encode_atom_len_as(*bufp, &ix, p, slen, ERLANG_UTF8, to_enc) < 0)
return -1;
*bufp += ix;
return 0;
}
int verify_ascii_atom(const char* src, int slen)
{
while (slen > 0) {
if ((src[0] & 0x80) != 0) return -1;
src++;
slen--;
}
return 0;
}
int verify_utf8_atom(const char* src, int slen)
{
int num_chars = 0;
while (slen > 0) {
if (++num_chars >= MAXATOMLEN) return -1;
if ((src[0] & 0x80) != 0) {
if ((src[0] & 0xE0) == 0xC0) {
if (slen < 2 || (src[1] & 0xC0) != 0x80) return -1;
src++;
slen--;
}
else if ((src[0] & 0xF0) == 0xE0) {
if (slen < 3 || (src[1] & 0xC0) != 0x80 || (src[2] & 0xC0) != 0x80) return -1;
src += 2;
slen -= 2;
}
else if ((src[0] & 0xF8) == 0xF0) {
if (slen < 4 || (src[1] & 0xC0) != 0x80 || (src[2] & 0xC0) != 0x80 || (src[3] & 0xC0) != 0x80) return -1;
src += 3;
slen -= 3;
}
else return -1;
}
src++;
slen--;
}
return 0;
}
|
