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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/* Conversion module for UTF-32.
Copyright (C) 1999-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <byteswap.h>
#include <dlfcn.h>
#include <gconv.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
/* This is the Byte Order Mark character (BOM). */
#define BOM 0x0000feffu
/* And in the other byte order. */
#define BOM_OE 0xfffe0000u
/* Definitions used in the body of the `gconv' function. */
#define FROM_LOOP from_utf32_loop
#define TO_LOOP to_utf32_loop
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define ONE_DIRECTION 0
#define FROM_DIRECTION (dir == from_utf32)
#define PREPARE_LOOP \
enum direction dir = ((struct utf32_data *) step->__data)->dir; \
enum variant var = ((struct utf32_data *) step->__data)->var; \
int swap; \
if (FROM_DIRECTION && var == UTF_32) \
{ \
if (__glibc_unlikely (data->__invocation_counter == 0)) \
{ \
/* We have to find out which byte order the file is encoded in. */ \
if (inptr + 4 > inend) \
return (inptr == inend \
? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \
\
if (get32u (inptr) == BOM) \
/* Simply ignore the BOM character. */ \
*inptrp = inptr += 4; \
else if (get32u (inptr) == BOM_OE) \
{ \
data->__flags |= __GCONV_SWAP; \
*inptrp = inptr += 4; \
} \
} \
} \
else if (!FROM_DIRECTION && var == UTF_32 && !data->__internal_use \
&& data->__invocation_counter == 0) \
{ \
/* Emit the Byte Order Mark. */ \
if (__glibc_unlikely (outbuf + 4 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put32u (outbuf, BOM); \
outbuf += 4; \
} \
else if (__builtin_expect (data->__invocation_counter == 0, 0) \
&& ((var == UTF_32LE && BYTE_ORDER == BIG_ENDIAN) \
|| (var == UTF_32BE && BYTE_ORDER == LITTLE_ENDIAN))) \
data->__flags |= __GCONV_SWAP; \
swap = data->__flags & __GCONV_SWAP;
#define EXTRA_LOOP_ARGS , var, swap
/* Direction of the transformation. */
enum direction
{
illegal_dir,
to_utf32,
from_utf32
};
enum variant
{
illegal_var,
UTF_32,
UTF_32LE,
UTF_32BE
};
struct utf32_data
{
enum direction dir;
enum variant var;
};
extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
/* Determine which direction. */
struct utf32_data *new_data;
enum direction dir = illegal_dir;
enum variant var = illegal_var;
int result;
if (__strcasecmp (step->__from_name, "UTF-32//") == 0)
{
dir = from_utf32;
var = UTF_32;
}
else if (__strcasecmp (step->__to_name, "UTF-32//") == 0)
{
dir = to_utf32;
var = UTF_32;
}
else if (__strcasecmp (step->__from_name, "UTF-32BE//") == 0)
{
dir = from_utf32;
var = UTF_32BE;
}
else if (__strcasecmp (step->__to_name, "UTF-32BE//") == 0)
{
dir = to_utf32;
var = UTF_32BE;
}
else if (__strcasecmp (step->__from_name, "UTF-32LE//") == 0)
{
dir = from_utf32;
var = UTF_32LE;
}
else if (__strcasecmp (step->__to_name, "UTF-32LE//") == 0)
{
dir = to_utf32;
var = UTF_32LE;
}
result = __GCONV_NOCONV;
if (__builtin_expect (dir, to_utf32) != illegal_dir)
{
new_data = (struct utf32_data *) malloc (sizeof (struct utf32_data));
result = __GCONV_NOMEM;
if (new_data != NULL)
{
new_data->dir = dir;
new_data->var = var;
step->__data = new_data;
if (dir == from_utf32)
{
step->__min_needed_from = MIN_NEEDED_FROM;
step->__max_needed_from = MIN_NEEDED_FROM;
step->__min_needed_to = MIN_NEEDED_TO;
step->__max_needed_to = MIN_NEEDED_TO;
}
else
{
step->__min_needed_from = MIN_NEEDED_TO;
step->__max_needed_from = MIN_NEEDED_TO;
step->__min_needed_to = MIN_NEEDED_FROM;
step->__max_needed_to = MIN_NEEDED_FROM;
}
step->__stateful = 0;
result = __GCONV_OK;
}
}
return result;
}
extern void gconv_end (struct __gconv_step *data);
void
gconv_end (struct __gconv_step *data)
{
free (data->__data);
}
/* Convert from the internal (UCS4-like) format to UTF-32. */
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define LOOPFCT TO_LOOP
#define BODY \
{ \
uint32_t c = get32 (inptr); \
\
if (__glibc_unlikely (c >= 0x110000)) \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \
{ \
/* Surrogate characters in UCS-4 input are not valid. \
We must catch this. If we let surrogates pass through, \
attackers could make a security hole exploit by \
generating "irregular UTF-32" sequences. */ \
result = __GCONV_ILLEGAL_INPUT; \
if (! ignore_errors_p ()) \
break; \
inptr += 4; \
++*irreversible; \
continue; \
} \
\
if (swap) \
c = bswap_32 (c); \
put32 (outptr, c); \
\
outptr += 4; \
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS \
, enum variant var, int swap
#include <iconv/loop.c>
/* Convert from UTF-32 to the internal (UCS4-like) format. */
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t u1 = get32 (inptr); \
\
if (swap) \
u1 = bswap_32 (u1); \
\
if (__glibc_unlikely (u1 >= 0x110000 || (u1 >= 0xd800 && u1 < 0xe000))) \
{ \
/* This is illegal. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (4); \
} \
\
put32 (outptr, u1); \
inptr += 4; \
outptr += 4; \
}
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS \
, enum variant var, int swap
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
|
