d2e19e3c45b9f822d3f9398412466849c818704d
[openwrt.git] / package / libs / libiconv / src / iconv.c
1 #include <iconv.h>
2 #include <errno.h>
3 #include <wchar.h>
4 #include <string.h>
5 #include <strings.h>
6 #include <stdlib.h>
7 #include <limits.h>
8
9 #include <dirent.h>
10 #include <fcntl.h>
11 #include <sys/mman.h>
12 #include <sys/stat.h>
13 #include <unistd.h>
14 #include <stdint.h>
15
16 /* builtin charmaps */
17 #include "charmaps.h"
18
19 /* only 0-7 are valid as dest charset */
20 #define UTF_16BE    000
21 #define UTF_16LE    001
22 #define UTF_32BE    002
23 #define UTF_32LE    003
24 #define WCHAR_T     004
25 #define UTF_8       005
26 #define US_ASCII    006
27 #define LATIN_1     007
28
29 /* additional charsets with algorithmic conversion */
30 #define LATIN_9     010
31 #define TIS_620     011
32 #define JIS_0201    012
33
34 /* some programs like php need this */
35 int _libiconv_version = _LIBICONV_VERSION;
36
37 /* these must match the constants above */
38 static const unsigned char charsets[] =
39         "\005" "UTF-8"      "\0"
40         "\004" "WCHAR_T"    "\0"
41         "\000" "UTF-16BE"   "\0"
42         "\001" "UTF-16LE"   "\0"
43         "\002" "UTF-32BE"   "\0"
44         "\003" "UTF-32LE"   "\0"
45         "\006" "ASCII"      "\0"
46         "\006" "US-ASCII"   "\0"
47         "\007" "ISO-8859-1" "\0"
48         "\007" "LATIN1"     "\0"
49         "\010" "ISO-8859-15""\0"
50         "\010" "LATIN9"     "\0"
51         "\011" "ISO-8859-11""\0"
52         "\011" "TIS-620"    "\0"
53         "\012" "JIS-0201"   "\0"
54         "\377";
55
56 /* separate identifiers for sbcs/dbcs/etc map type */
57 #define UCS2_8BIT   000
58 #define UCS3_8BIT   001
59 #define EUC         002
60 #define EUC_TW      003
61 #define SHIFT_JIS   004
62 #define BIG5        005
63 #define GBK         006
64
65 /* FIXME: these are not implemented yet
66 // EUC:   A1-FE A1-FE
67 // GBK:   81-FE 40-7E,80-FE
68 // Big5:  A1-FE 40-7E,A1-FE
69 */
70
71 static const unsigned short maplen[] = {
72         [UCS2_8BIT] = 4+ 2* 128,
73         [UCS3_8BIT] = 4+ 3* 128,
74         [EUC]       = 4+ 2* 94*94,
75         [SHIFT_JIS] = 4+ 2* 94*94,
76         [BIG5]      = 4+ 2* 94*157,
77         [GBK]       = 4+ 2* 126*190,
78         [EUC_TW]    = 4+ 2* 2*94*94,
79 };
80
81 static int find_charmap(const char *name)
82 {
83         int i;
84         for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
85                 if (!strcasecmp(charmaps[i].name, name))
86                         return i;
87         return -1;
88 }
89
90 static int find_charset(const char *name)
91 {
92         const unsigned char *s;
93         for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
94         return *s;
95 }
96
97 iconv_t iconv_open(const char *to, const char *from)
98 {
99         unsigned f, t;
100         int m;
101
102         if ((t = find_charset(to)) > 8)
103                 return -1;
104
105         if ((f = find_charset(from)) < 255)
106                 return 0 | (t<<1) | (f<<8);
107
108         if ((m = find_charmap(from)) > -1)
109                 return 1 | (t<<1) | (m<<8);
110
111         return -1;
112 }
113
114 int iconv_close(iconv_t cd)
115 {
116         return 0;
117 }
118
119 static inline wchar_t get_16(const unsigned char *s, int endian)
120 {
121         endian &= 1;
122         return s[endian]<<8 | s[endian^1];
123 }
124
125 static inline void put_16(unsigned char *s, wchar_t c, int endian)
126 {
127         endian &= 1;
128         s[endian] = c>>8;
129         s[endian^1] = c;
130 }
131
132 static inline int utf8enc_wchar(char *outb, wchar_t c)
133 {
134         if (c <= 0x7F) {
135                 *outb = c;
136                 return 1;
137         }
138         else if (c <= 0x7FF) {
139                 *outb++ = ((c >>  6) & 0x1F) | 0xC0;
140                 *outb++ = ( c        & 0x3F) | 0x80;
141                 return 2;
142         }
143         else if (c <= 0xFFFF) {
144                 *outb++ = ((c >> 12) & 0x0F) | 0xE0;
145                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
146                 *outb++ = ( c        & 0x3F) | 0x80;
147                 return 3;
148         }
149         else if (c <= 0x10FFFF) {
150                 *outb++ = ((c >> 18) & 0x07) | 0xF0;
151                 *outb++ = ((c >> 12) & 0x3F) | 0x80;
152                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
153                 *outb++ = ( c        & 0x3F) | 0x80;
154                 return 4;
155         }
156         else {
157                 *outb++ = '?';
158                 return 1;
159         }
160 }
161
162 static inline int utf8seq_is_overlong(char *s, int n)
163 {
164         switch (n)
165         {
166         case 2:
167                 /* 1100000x (10xxxxxx) */
168                 return (((*s >> 1) == 0x60) &&
169                                 ((*(s+1) >> 6) == 0x02));
170
171         case 3:
172                 /* 11100000 100xxxxx (10xxxxxx) */
173                 return ((*s == 0xE0) &&
174                                 ((*(s+1) >> 5) == 0x04) &&
175                                 ((*(s+2) >> 6) == 0x02));
176
177         case 4:
178                 /* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
179                 return ((*s == 0xF0) &&
180                                 ((*(s+1) >> 4) == 0x08) &&
181                                 ((*(s+2) >> 6) == 0x02) &&
182                                 ((*(s+3) >> 6) == 0x02));
183         }
184
185         return 0;
186 }
187
188 static inline int utf8seq_is_surrogate(char *s, int n)
189 {
190         return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
191 }
192
193 static inline int utf8seq_is_illegal(char *s, int n)
194 {
195         return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
196                 (*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
197 }
198
199 static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
200 {
201         int i;
202         int n = -1;
203
204         /* trivial char */
205         if (*in <= 0x7F) {
206                 *c = *in;
207                 return 1;
208         }
209
210         /* find utf8 sequence length */
211         if      ((*in & 0xE0) == 0xC0) n = 2;
212         else if ((*in & 0xF0) == 0xE0) n = 3;
213         else if ((*in & 0xF8) == 0xF0) n = 4;
214         else if ((*in & 0xFC) == 0xF8) n = 5;
215         else if ((*in & 0xFE) == 0xFC) n = 6;
216
217         /* starved? */
218         if (n > inb)
219                 return -2;
220
221         /* decode ... */
222         if (n > 1 && n < 5) {
223                 /* reject invalid sequences */
224                 if (utf8seq_is_overlong(in, n) ||
225                         utf8seq_is_surrogate(in, n) ||
226                         utf8seq_is_illegal(in, n))
227                         return -1;
228
229                 /* decode ... */
230                 *c = (char)(*in++ & (0x7F >> n));
231
232                 for (i = 1; i < n; i++) {
233                         /* illegal continuation byte */
234                         if (*in < 0x80 || *in > 0xBF)
235                                 return -1;
236
237                         *c = (*c << 6) | (*in++ & 0x3F);
238                 }
239
240                 return n;
241         }
242
243         /* unmapped sequence (> 4) */
244         return -1;
245 }
246
247 static inline wchar_t latin9_translit(wchar_t c)
248 {
249         /* a number of trivial iso-8859-15 <> utf-8 transliterations */
250         switch (c) {
251         case 0x20AC: return 0xA4; /* Euro */
252         case 0x0160: return 0xA6; /* S caron */
253         case 0x0161: return 0xA8; /* s caron */
254         case 0x017D: return 0xB4; /* Z caron */
255         case 0x017E: return 0xB8; /* z caron */
256         case 0x0152: return 0xBC; /* OE */
257         case 0x0153: return 0xBD; /* oe */
258         case 0x0178: return 0xBE; /* Y diaeresis */
259         default:     return 0xFFFD; /* cannot translate */
260         }
261 }
262
263 size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
264 {
265         size_t x=0;
266         unsigned char to = (cd>>1)&127;
267         unsigned char from = 255;
268         const unsigned char *map = 0;
269         char tmp[MB_LEN_MAX];
270         wchar_t c, d;
271         size_t k, l;
272         int err;
273
274         if (!in || !*in || !*inb) return 0;
275
276         if (cd & 1)
277                 map = charmaps[cd>>8].map;
278         else
279                 from = cd>>8;
280
281         for (; *inb; *in+=l, *inb-=l) {
282                 c = *(unsigned char *)*in;
283                 l = 1;
284                 if (from >= UTF_8 && c < 0x80) goto charok;
285                 switch (from) {
286                 case WCHAR_T:
287                         l = sizeof(wchar_t);
288                         if (*inb < l) goto starved;
289                         c = *(wchar_t *)*in;
290                         break;
291                 case UTF_8:
292                         l = utf8dec_wchar(&c, *in, *inb);
293                         if (!l) l++;
294                         else if (l == (size_t)-1) goto ilseq;
295                         else if (l == (size_t)-2) goto starved;
296                         break;
297                 case US_ASCII:
298                         goto ilseq;
299                 case LATIN_9:
300                         if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
301                                 static const unsigned char map[] = {
302                                         0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
303                                         0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
304                                         0x52, 0x53, 0x78
305                                 };
306                                 if (c == 0xa4) c = 0x20ac;
307                                 else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
308                         }
309                 case LATIN_1:
310                         goto charok;
311                 case TIS_620:
312                         if (c >= 0xa1) c += 0x0e01-0xa1;
313                         goto charok;
314                 case JIS_0201:
315                         if (c >= 0xa1) {
316                                 if (c <= 0xdf) c += 0xff61-0xa1;
317                                 else goto ilseq;
318                         }
319                         goto charok;
320                 case UTF_16BE:
321                 case UTF_16LE:
322                         l = 2;
323                         if (*inb < 2) goto starved;
324                         c = get_16(*in, from);
325                         if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
326                         if ((unsigned)(c-0xd800) < 0x400) {
327                                 l = 4;
328                                 if (*inb < 4) goto starved;
329                                 d = get_16(*in + 2, from);
330                                 if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
331                                 c = ((c-0xd800)<<10) | (d-0xdc00);
332                         }
333                         break;
334                 case UTF_32BE:
335                 case UTF_32LE:
336                         l = 4;
337                         if (*inb < 4) goto starved;
338                         // FIXME
339                         // c = get_32(*in, from);
340                         break;
341                 default:
342                         /* only support ascii supersets */
343                         if (c < 0x80) break;
344                         switch (map[0]) {
345                         case UCS2_8BIT:
346                                 c -= 0x80;
347                                 break;
348                         case EUC:
349                                 if ((unsigned)c - 0xa1 >= 94) goto ilseq;
350                                 if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
351                                 c = (c-0xa1)*94 + (in[0][1]-0xa1);
352                                 l = 2;
353                                 break;
354                         case SHIFT_JIS:
355                                 if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
356                                         c += 0xff61-0xa1;
357                                         goto charok;
358                                 }
359                                 // FIXME...
360                                 l = 2;
361                                 break;
362                         default:
363                                 goto badf;
364                         }
365                         c = get_16(map + 4 + 2*c, 0);
366                         if (c == 0xffff) goto ilseq;
367                         goto charok;
368                 }
369
370                 if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
371                         goto ilseq;
372 charok:
373                 switch (to) {
374                 case WCHAR_T:
375                         if (*outb < sizeof(wchar_t)) goto toobig;
376                         *(wchar_t *)*out = c;
377                         *out += sizeof(wchar_t);
378                         *outb -= sizeof(wchar_t);
379                         break;
380                 case UTF_8:
381                         if (*outb < 4) {
382                                 k = utf8enc_wchar(tmp, c);
383                                 if (*outb < k) goto toobig;
384                                 memcpy(*out, tmp, k);
385                         } else k = utf8enc_wchar(*out, c);
386                         *out += k;
387                         *outb -= k;
388                         break;
389                 case US_ASCII:
390                         if (c > 0x7f) c = 0xfffd;
391                         /* fall thru and count replacement in latin1 case */
392                 case LATIN_9:
393                         if (c >= 0x100 && c != 0xfffd)
394                                 c = latin9_translit(c);
395                         /* fall through */
396                 case LATIN_1:
397                         if (c > 0xff) goto ilseq;
398                         if (!*outb) goto toobig;
399                         **out = c;
400                         ++*out;
401                         --*outb;
402                         break;
403                 case UTF_16BE:
404                 case UTF_16LE:
405                         if (c < 0x10000) {
406                                 if (*outb < 2) goto toobig;
407                                 put_16(*out, c, to);
408                                 *out += 2;
409                                 *outb -= 2;
410                                 break;
411                         }
412                         if (*outb < 4) goto toobig;
413                         put_16(*out, (c>>10)|0xd800, to);
414                         put_16(*out + 2, (c&0x3ff)|0xdc00, to);
415                         *out += 4;
416                         *outb -= 4;
417                         break;
418                 default:
419                         goto badf;
420                 }
421         }
422         return x;
423 ilseq:
424         err = EILSEQ;
425         x = -1;
426         goto end;
427 badf:
428         err = EBADF;
429         x = -1;
430         goto end;
431 toobig:
432         err = E2BIG;
433         x = -1;
434         goto end;
435 starved:
436         err = EINVAL;
437 end:
438         errno = err;
439         return x;
440 }