1 /* Conversion module for UTF-32.
2 Copyright (C) 1999, 2000-2002, 2011 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 /* This is the Byte Order Mark character (BOM). */
29 #define BOM 0x0000feffu
30 /* And in the other byte order. */
31 #define BOM_OE 0xfffe0000u
34 /* Definitions used in the body of the `gconv' function. */
35 #define FROM_LOOP from_utf32_loop
36 #define TO_LOOP to_utf32_loop
39 #define MIN_NEEDED_FROM 4
40 #define MIN_NEEDED_TO 4
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; \
46 if (FROM_DIRECTION && var == UTF_32) \
48 if (__builtin_expect (data->__invocation_counter == 0, 0)) \
50 /* We have to find out which byte order the file is encoded in. */ \
51 if (inptr + 4 > inend) \
52 return (inptr == inend \
53 ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \
55 if (get32u (inptr) == BOM) \
56 /* Simply ignore the BOM character. */ \
57 *inptrp = inptr += 4; \
58 else if (get32u (inptr) == BOM_OE) \
60 data->__flags |= __GCONV_SWAP; \
61 *inptrp = inptr += 4; \
65 else if (!FROM_DIRECTION && var == UTF_32 && !data->__internal_use \
66 && data->__invocation_counter == 0) \
68 /* Emit the Byte Order Mark. */ \
69 if (__builtin_expect (outbuf + 4 > outend, 0)) \
70 return __GCONV_FULL_OUTPUT; \
72 put32u (outbuf, BOM); \
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;
80 #define EXTRA_LOOP_ARGS , var, swap
83 /* Direction of the transformation. */
106 extern int gconv_init (struct __gconv_step *step);
108 gconv_init (struct __gconv_step *step)
110 /* Determine which direction. */
111 struct utf32_data *new_data;
112 enum direction dir = illegal_dir;
113 enum variant var = illegal_var;
116 if (__strcasecmp (step->__from_name, "UTF-32//") == 0)
121 else if (__strcasecmp (step->__to_name, "UTF-32//") == 0)
126 else if (__strcasecmp (step->__from_name, "UTF-32BE//") == 0)
131 else if (__strcasecmp (step->__to_name, "UTF-32BE//") == 0)
136 else if (__strcasecmp (step->__from_name, "UTF-32LE//") == 0)
141 else if (__strcasecmp (step->__to_name, "UTF-32LE//") == 0)
147 result = __GCONV_NOCONV;
148 if (__builtin_expect (dir, to_utf32) != illegal_dir)
150 new_data = (struct utf32_data *) malloc (sizeof (struct utf32_data));
152 result = __GCONV_NOMEM;
153 if (new_data != NULL)
157 step->__data = new_data;
159 if (dir == from_utf32)
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;
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;
174 step->__stateful = 0;
184 extern void gconv_end (struct __gconv_step *data);
186 gconv_end (struct __gconv_step *data)
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
198 uint32_t c = get32 (inptr); \
200 if (__builtin_expect (c >= 0x110000, 0)) \
202 STANDARD_TO_LOOP_ERR_HANDLER (4); \
204 else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0)) \
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. */ \
210 result = __GCONV_ILLEGAL_INPUT; \
211 if (! ignore_errors_p ()) \
225 #define LOOP_NEED_FLAGS
226 #define EXTRA_LOOP_DECLS \
227 , enum variant var, int swap
228 #include <iconv/loop.c>
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
237 uint32_t u1 = get32 (inptr); \
240 u1 = bswap_32 (u1); \
242 if (__builtin_expect (u1 >= 0x110000, 0)) \
244 /* This is illegal. */ \
245 STANDARD_FROM_LOOP_ERR_HANDLER (4); \
248 put32 (outptr, u1); \
252 #define LOOP_NEED_FLAGS
253 #define EXTRA_LOOP_DECLS \
254 , enum variant var, int swap
255 #include <iconv/loop.c>
258 /* Now define the toplevel functions. */
259 #include <iconv/skeleton.c>