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b721a2c0 | 1 | /* Conversion module for UTF-32. |
04277e02 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
b721a2c0 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
b721a2c0 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
b721a2c0 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b721a2c0 UD |
18 | |
19 | #include <byteswap.h> | |
20 | #include <dlfcn.h> | |
21 | #include <gconv.h> | |
22 | #include <stddef.h> | |
23 | #include <stdint.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | ||
27 | /* This is the Byte Order Mark character (BOM). */ | |
28 | #define BOM 0x0000feffu | |
29 | /* And in the other byte order. */ | |
30 | #define BOM_OE 0xfffe0000u | |
31 | ||
32 | ||
33 | /* Definitions used in the body of the `gconv' function. */ | |
34 | #define FROM_LOOP from_utf32_loop | |
35 | #define TO_LOOP to_utf32_loop | |
36 | #define DEFINE_INIT 0 | |
37 | #define DEFINE_FINI 0 | |
38 | #define MIN_NEEDED_FROM 4 | |
39 | #define MIN_NEEDED_TO 4 | |
13e402e7 | 40 | #define ONE_DIRECTION 0 |
b721a2c0 UD |
41 | #define FROM_DIRECTION (dir == from_utf32) |
42 | #define PREPARE_LOOP \ | |
43 | enum direction dir = ((struct utf32_data *) step->__data)->dir; \ | |
44 | enum variant var = ((struct utf32_data *) step->__data)->var; \ | |
45 | int swap; \ | |
46 | if (FROM_DIRECTION && var == UTF_32) \ | |
47 | { \ | |
a1ffb40e | 48 | if (__glibc_unlikely (data->__invocation_counter == 0)) \ |
b721a2c0 UD |
49 | { \ |
50 | /* We have to find out which byte order the file is encoded in. */ \ | |
51 | if (inptr + 4 > inend) \ | |
eb9dc2a2 UD |
52 | return (inptr == inend \ |
53 | ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \ | |
b721a2c0 UD |
54 | \ |
55 | if (get32u (inptr) == BOM) \ | |
56 | /* Simply ignore the BOM character. */ \ | |
57 | *inptrp = inptr += 4; \ | |
58 | else if (get32u (inptr) == BOM_OE) \ | |
59 | { \ | |
ee190f67 | 60 | data->__flags |= __GCONV_SWAP; \ |
b721a2c0 UD |
61 | *inptrp = inptr += 4; \ |
62 | } \ | |
63 | } \ | |
64 | } \ | |
65 | else if (!FROM_DIRECTION && var == UTF_32 && !data->__internal_use \ | |
66 | && data->__invocation_counter == 0) \ | |
67 | { \ | |
68 | /* Emit the Byte Order Mark. */ \ | |
a1ffb40e | 69 | if (__glibc_unlikely (outbuf + 4 > outend)) \ |
b721a2c0 UD |
70 | return __GCONV_FULL_OUTPUT; \ |
71 | \ | |
72 | put32u (outbuf, BOM); \ | |
73 | outbuf += 4; \ | |
74 | } \ | |
ee190f67 UD |
75 | else if (__builtin_expect (data->__invocation_counter == 0, 0) \ |
76 | && ((var == UTF_32LE && BYTE_ORDER == BIG_ENDIAN) \ | |
77 | || (var == UTF_32BE && BYTE_ORDER == LITTLE_ENDIAN))) \ | |
78 | data->__flags |= __GCONV_SWAP; \ | |
79 | swap = data->__flags & __GCONV_SWAP; | |
b721a2c0 UD |
80 | #define EXTRA_LOOP_ARGS , var, swap |
81 | ||
82 | ||
83 | /* Direction of the transformation. */ | |
84 | enum direction | |
85 | { | |
86 | illegal_dir, | |
87 | to_utf32, | |
88 | from_utf32 | |
89 | }; | |
90 | ||
91 | enum variant | |
92 | { | |
93 | illegal_var, | |
94 | UTF_32, | |
95 | UTF_32LE, | |
96 | UTF_32BE | |
97 | }; | |
98 | ||
99 | struct utf32_data | |
100 | { | |
101 | enum direction dir; | |
102 | enum variant var; | |
b721a2c0 UD |
103 | }; |
104 | ||
105 | ||
106 | extern int gconv_init (struct __gconv_step *step); | |
107 | int | |
108 | gconv_init (struct __gconv_step *step) | |
109 | { | |
110 | /* Determine which direction. */ | |
111 | struct utf32_data *new_data; | |
112 | enum direction dir = illegal_dir; | |
113 | enum variant var = illegal_var; | |
114 | int result; | |
115 | ||
116 | if (__strcasecmp (step->__from_name, "UTF-32//") == 0) | |
117 | { | |
118 | dir = from_utf32; | |
119 | var = UTF_32; | |
120 | } | |
121 | else if (__strcasecmp (step->__to_name, "UTF-32//") == 0) | |
122 | { | |
123 | dir = to_utf32; | |
124 | var = UTF_32; | |
125 | } | |
126 | else if (__strcasecmp (step->__from_name, "UTF-32BE//") == 0) | |
127 | { | |
128 | dir = from_utf32; | |
129 | var = UTF_32BE; | |
130 | } | |
131 | else if (__strcasecmp (step->__to_name, "UTF-32BE//") == 0) | |
132 | { | |
133 | dir = to_utf32; | |
134 | var = UTF_32BE; | |
135 | } | |
136 | else if (__strcasecmp (step->__from_name, "UTF-32LE//") == 0) | |
137 | { | |
138 | dir = from_utf32; | |
139 | var = UTF_32LE; | |
140 | } | |
141 | else if (__strcasecmp (step->__to_name, "UTF-32LE//") == 0) | |
142 | { | |
143 | dir = to_utf32; | |
144 | var = UTF_32LE; | |
145 | } | |
146 | ||
147 | result = __GCONV_NOCONV; | |
148 | if (__builtin_expect (dir, to_utf32) != illegal_dir) | |
149 | { | |
150 | new_data = (struct utf32_data *) malloc (sizeof (struct utf32_data)); | |
151 | ||
152 | result = __GCONV_NOMEM; | |
153 | if (new_data != NULL) | |
154 | { | |
155 | new_data->dir = dir; | |
156 | new_data->var = var; | |
b721a2c0 UD |
157 | step->__data = new_data; |
158 | ||
159 | if (dir == from_utf32) | |
160 | { | |
161 | step->__min_needed_from = MIN_NEEDED_FROM; | |
162 | step->__max_needed_from = MIN_NEEDED_FROM; | |
163 | step->__min_needed_to = MIN_NEEDED_TO; | |
164 | step->__max_needed_to = MIN_NEEDED_TO; | |
165 | } | |
166 | else | |
167 | { | |
168 | step->__min_needed_from = MIN_NEEDED_TO; | |
169 | step->__max_needed_from = MIN_NEEDED_TO; | |
170 | step->__min_needed_to = MIN_NEEDED_FROM; | |
171 | step->__max_needed_to = MIN_NEEDED_FROM; | |
172 | } | |
173 | ||
174 | step->__stateful = 0; | |
175 | ||
176 | result = __GCONV_OK; | |
177 | } | |
178 | } | |
179 | ||
180 | return result; | |
181 | } | |
182 | ||
183 | ||
184 | extern void gconv_end (struct __gconv_step *data); | |
185 | void | |
186 | gconv_end (struct __gconv_step *data) | |
187 | { | |
188 | free (data->__data); | |
189 | } | |
190 | ||
191 | ||
192 | /* Convert from the internal (UCS4-like) format to UTF-32. */ | |
193 | #define MIN_NEEDED_INPUT MIN_NEEDED_TO | |
194 | #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM | |
195 | #define LOOPFCT TO_LOOP | |
196 | #define BODY \ | |
197 | { \ | |
198 | uint32_t c = get32 (inptr); \ | |
199 | \ | |
a1ffb40e | 200 | if (__glibc_unlikely (c >= 0x110000)) \ |
b721a2c0 | 201 | { \ |
e438a468 | 202 | STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
b721a2c0 | 203 | } \ |
a1ffb40e | 204 | else if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \ |
b721a2c0 UD |
205 | { \ |
206 | /* Surrogate characters in UCS-4 input are not valid. \ | |
207 | We must catch this. If we let surrogates pass through, \ | |
208 | attackers could make a security hole exploit by \ | |
209 | generating "irregular UTF-32" sequences. */ \ | |
e438a468 | 210 | result = __GCONV_ILLEGAL_INPUT; \ |
b721a2c0 | 211 | if (! ignore_errors_p ()) \ |
e438a468 | 212 | break; \ |
b721a2c0 UD |
213 | inptr += 4; \ |
214 | ++*irreversible; \ | |
215 | continue; \ | |
216 | } \ | |
217 | \ | |
218 | if (swap) \ | |
ee190f67 UD |
219 | c = bswap_32 (c); \ |
220 | put32 (outptr, c); \ | |
b721a2c0 UD |
221 | \ |
222 | outptr += 4; \ | |
223 | inptr += 4; \ | |
224 | } | |
225 | #define LOOP_NEED_FLAGS | |
226 | #define EXTRA_LOOP_DECLS \ | |
227 | , enum variant var, int swap | |
228 | #include <iconv/loop.c> | |
229 | ||
230 | ||
231 | /* Convert from UTF-32 to the internal (UCS4-like) format. */ | |
232 | #define MIN_NEEDED_INPUT MIN_NEEDED_FROM | |
233 | #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO | |
234 | #define LOOPFCT FROM_LOOP | |
235 | #define BODY \ | |
236 | { \ | |
237 | uint32_t u1 = get32 (inptr); \ | |
238 | \ | |
239 | if (swap) \ | |
240 | u1 = bswap_32 (u1); \ | |
241 | \ | |
7ab1de21 | 242 | if (__glibc_unlikely (u1 >= 0x110000 || (u1 >= 0xd800 && u1 < 0xe000))) \ |
b721a2c0 UD |
243 | { \ |
244 | /* This is illegal. */ \ | |
e438a468 | 245 | STANDARD_FROM_LOOP_ERR_HANDLER (4); \ |
b721a2c0 UD |
246 | } \ |
247 | \ | |
248 | put32 (outptr, u1); \ | |
249 | inptr += 4; \ | |
250 | outptr += 4; \ | |
251 | } | |
252 | #define LOOP_NEED_FLAGS | |
253 | #define EXTRA_LOOP_DECLS \ | |
254 | , enum variant var, int swap | |
255 | #include <iconv/loop.c> | |
256 | ||
257 | ||
258 | /* Now define the toplevel functions. */ | |
259 | #include <iconv/skeleton.c> |