1 #include <iconv.h>
2 #include <errno.h>
3 #include <wchar.h>
4 #include <string.h>
5 #include <stdlib.h>
6 #include <limits.h>
7 #include <stdint.h>
8
9 #define UTF_32BE 0300
10 #define UTF_16LE 0301
11 #define UTF_16BE 0302
12 #define UTF_32LE 0303
13 #define UCS2BE 0304
14 #define UCS2LE 0305
15 #define WCHAR_T 0306
16 #define US_ASCII 0307
17 #define UTF_8 0310
18 #define EUC_JP 0320
19 #define SHIFT_JIS 0321
20 #define GB18030 0330
21 #define GBK 0331
22 #define GB2312 0332
23
24 /* FIXME: these are not implemented yet
25 * EUC: A1-FE A1-FE
26 * GBK: 81-FE 40-7E,80-FE
27 * Big5: A1-FE 40-7E,A1-FE
28 */
29
30 /* Definitions of charmaps. Each charmap consists of:
31 * 1. Empty-string-terminated list of null-terminated aliases.
32 * 2. Special type code or number of elided entries.
33 * 3. Character table (size determined by field 2). */
34
35 static const unsigned char charmaps[] =
36 "utf8\0\0\310"
37 "wchart\0\0\306"
38 "ucs2\0ucs2be\0\0\304"
39 "ucs2le\0\0\305"
40 "utf16\0utf16be\0\0\302"
41 "utf16le\0\0\301"
42 "ucs4\0ucs4be\0utf32\0utf32be\0\0\300"
43 "ucs4le\0utf32le\0\0\303"
44 "ascii\0usascii\0iso646\0iso646us\0\0\307"
45 "eucjp\0\0\320"
46 "shiftjis\0sjis\0\0\321"
47 "gb18030\0\0\330"
48 "gbk\0\0\331"
49 "gb2312\0\0\332"
50 #include "codepages.h"
51 ;
52
53 static const unsigned short legacy_chars[] = {
54 #include "legacychars.h"
55 };
56
57 static const unsigned short jis0208[84][94] = {
58 #include "jis0208.h"
59 };
60
61 static const unsigned short gb18030[126][190] = {
62 #include "gb18030.h"
63 };
64
fuzzycmp(const unsigned char * a,const unsigned char * b)65 static int fuzzycmp(const unsigned char *a, const unsigned char *b)
66 {
67 for (; *a && *b; a++, b++) {
68 while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
69 if ((*a|32U) != *b) return 1;
70 }
71 return *a != *b;
72 }
73
find_charmap(const void * name)74 static size_t find_charmap(const void *name)
75 {
76 const unsigned char *s;
77 for (s=charmaps; *s; ) {
78 if (!fuzzycmp(name, s)) {
79 for (; *s; s+=strlen((void *)s)+1);
80 return s+1-charmaps;
81 }
82 s += strlen((void *)s)+1;
83 if (!*s) {
84 if (s[1] > 0200) s+=2;
85 else s+=2+(128U-s[1])/4*5;
86 }
87 }
88 return -1;
89 }
90
iconv_open(const char * to,const char * from)91 iconv_t iconv_open(const char *to, const char *from)
92 {
93 size_t f, t;
94
95 if ((t = find_charmap(to))==-1
96 || (f = find_charmap(from))==-1
97 || (charmaps[t] >= 0320)) {
98 errno = EINVAL;
99 return (iconv_t)-1;
100 }
101
102 return (void *)(f<<16 | t);
103 }
104
iconv_close(iconv_t cd)105 int iconv_close(iconv_t cd)
106 {
107 return 0;
108 }
109
get_16(const unsigned char * s,int e)110 static unsigned get_16(const unsigned char *s, int e)
111 {
112 e &= 1;
113 return s[e]<<8 | s[1-e];
114 }
115
put_16(unsigned char * s,unsigned c,int e)116 static void put_16(unsigned char *s, unsigned c, int e)
117 {
118 e &= 1;
119 s[e] = c>>8;
120 s[1-e] = c;
121 }
122
get_32(const unsigned char * s,int e)123 static unsigned get_32(const unsigned char *s, int e)
124 {
125 e &= 3;
126 return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
127 }
128
put_32(unsigned char * s,unsigned c,int e)129 static void put_32(unsigned char *s, unsigned c, int e)
130 {
131 e &= 3;
132 s[e^0] = c>>24;
133 s[e^1] = c>>16;
134 s[e^2] = c>>8;
135 s[e^3] = c;
136 }
137
138 /* Adapt as needed */
139 #define mbrtowc_utf8 mbrtowc
140 #define wctomb_utf8 wctomb
141
iconv(iconv_t cd0,char ** restrict in,size_t * restrict inb,char ** restrict out,size_t * restrict outb)142 size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
143 {
144 size_t x=0;
145 unsigned long cd = (unsigned long)cd0;
146 unsigned to = cd & 0xffff;
147 unsigned from = cd >> 16;
148 const unsigned char *map = charmaps+from+1;
149 const unsigned char *tomap = charmaps+to+1;
150 mbstate_t st = {0};
151 wchar_t wc;
152 unsigned c, d;
153 size_t k, l;
154 int err;
155 unsigned char type = map[-1];
156 unsigned char totype = tomap[-1];
157
158 if (!in || !*in || !*inb) return 0;
159
160 for (; *inb; *in+=l, *inb-=l) {
161 c = *(unsigned char *)*in;
162 l = 1;
163
164 if (c >= 128 || type-UTF_32BE < 7U) switch (type) {
165 case UTF_8:
166 l = mbrtowc_utf8(&wc, *in, *inb, &st);
167 if (!l) l++;
168 else if (l == (size_t)-1) goto ilseq;
169 else if (l == (size_t)-2) goto starved;
170 c = wc;
171 break;
172 case US_ASCII:
173 goto ilseq;
174 case WCHAR_T:
175 l = sizeof(wchar_t);
176 if (*inb < l) goto starved;
177 c = *(wchar_t *)*in;
178 if (0) {
179 case UTF_32BE:
180 case UTF_32LE:
181 l = 4;
182 if (*inb < 4) goto starved;
183 c = get_32((void *)*in, type);
184 }
185 if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
186 break;
187 case UCS2BE:
188 case UCS2LE:
189 case UTF_16BE:
190 case UTF_16LE:
191 l = 2;
192 if (*inb < 2) goto starved;
193 c = get_16((void *)*in, type);
194 if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
195 if ((unsigned)(c-0xd800) < 0x400) {
196 if (type-UCS2BE < 2U) goto ilseq;
197 l = 4;
198 if (*inb < 4) goto starved;
199 d = get_16((void *)(*in + 2), type);
200 if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
201 c = ((c-0xd7c0)<<10) + (d-0xdc00);
202 }
203 break;
204 case SHIFT_JIS:
205 if (c-0xa1 <= 0xdf-0xa1) {
206 c += 0xff61-0xa1;
207 break;
208 }
209 l = 2;
210 if (*inb < 2) goto starved;
211 d = *((unsigned char *)*in + 1);
212 if (c-129 <= 159-129) c -= 129;
213 else if (c-224 <= 239-224) c -= 193;
214 else goto ilseq;
215 c *= 2;
216 if (d-64 <= 158-64) {
217 if (d==127) goto ilseq;
218 if (d>127) d--;
219 d -= 64;
220 } else if (d-159 <= 252-159) {
221 c++;
222 d -= 159;
223 }
224 c = jis0208[c][d];
225 if (!c) goto ilseq;
226 break;
227 case EUC_JP:
228 l = 2;
229 if (*inb < 2) goto starved;
230 d = *((unsigned char *)*in + 1);
231 if (c==0x8e) {
232 c = d;
233 if (c-0xa1 > 0xdf-0xa1) goto ilseq;
234 c += 0xff61 - 0xa1;
235 break;
236 }
237 c -= 0xa1;
238 d -= 0xa1;
239 if (c >= 84 || d >= 94) goto ilseq;
240 c = jis0208[c][d];
241 if (!c) goto ilseq;
242 break;
243 case GB2312:
244 if (c < 0xa1) goto ilseq;
245 case GBK:
246 case GB18030:
247 c -= 0x81;
248 if (c >= 126) goto ilseq;
249 l = 2;
250 if (*inb < 2) goto starved;
251 d = *((unsigned char *)*in + 1);
252 if (d < 0xa1 && type == GB2312) goto ilseq;
253 if (d-0x40>=191 || d==127) {
254 if (d-'0'>9 || type != GB18030)
255 goto ilseq;
256 l = 4;
257 if (*inb < 4) goto starved;
258 c = (10*c + d-'0') * 1260;
259 d = *((unsigned char *)*in + 2);
260 if (d-0x81>126) goto ilseq;
261 c += 10*(d-0x81);
262 d = *((unsigned char *)*in + 3);
263 if (d-'0'>9) goto ilseq;
264 c += d-'0';
265 c += 128;
266 for (d=0; d<=c; ) {
267 k = 0;
268 int i, j;
269 for (i=0; i<126; i++)
270 for (j=0; j<190; j++)
271 if (gb18030[i][j]-d <= c-d)
272 k++;
273 d = c+1;
274 c += k;
275 }
276 break;
277 }
278 d -= 0x40;
279 if (d>63) d--;
280 c = gb18030[c][d];
281 break;
282 default:
283 if (c < 128+type) break;
284 c -= 128+type;
285 c = legacy_chars[ map[c*5/4]>>2*c%8 |
286 map[c*5/4+1]<<8-2*c%8 & 1023 ];
287 if (!c) c = *(unsigned char *)*in;
288 if (c==1) goto ilseq;
289 }
290
291 switch (totype) {
292 case WCHAR_T:
293 if (*outb < sizeof(wchar_t)) goto toobig;
294 *(wchar_t *)*out = c;
295 *out += sizeof(wchar_t);
296 *outb -= sizeof(wchar_t);
297 break;
298 case UTF_8:
299 if (*outb < 4) {
300 char tmp[4];
301 k = wctomb_utf8(tmp, c);
302 if (*outb < k) goto toobig;
303 memcpy(*out, tmp, k);
304 } else k = wctomb_utf8(*out, c);
305 *out += k;
306 *outb -= k;
307 break;
308 case US_ASCII:
309 if (c > 0x7f) subst: x++, c='*';
310 default:
311 if (*outb < 1) goto toobig;
312 if (c < 128+totype) {
313 revout:
314 *(*out)++ = c;
315 *outb -= 1;
316 break;
317 }
318 d = c;
319 for (c=0; c<128-totype; c++) {
320 if (d == legacy_chars[ map[c*5/4]>>2*c%8 |
321 map[c*5/4+1]<<8-2*c%8 & 1023 ]) {
322 c += 128;
323 goto revout;
324 }
325 }
326 goto subst;
327 case UCS2BE:
328 case UCS2LE:
329 case UTF_16BE:
330 case UTF_16LE:
331 if (c < 0x10000 || type-UCS2BE < 2U) {
332 if (c >= 0x10000) c = 0xFFFD;
333 if (*outb < 2) goto toobig;
334 put_16((void *)*out, c, totype);
335 *out += 2;
336 *outb -= 2;
337 break;
338 }
339 if (*outb < 4) goto toobig;
340 c -= 0x10000;
341 put_16((void *)*out, (c>>10)|0xd800, totype);
342 put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
343 *out += 4;
344 *outb -= 4;
345 break;
346 case UTF_32BE:
347 case UTF_32LE:
348 if (*outb < 4) goto toobig;
349 put_32((void *)*out, c, totype);
350 *out += 4;
351 *outb -= 4;
352 break;
353 }
354 }
355 return x;
356 ilseq:
357 err = EILSEQ;
358 x = -1;
359 goto end;
360 toobig:
361 err = E2BIG;
362 x = -1;
363 goto end;
364 starved:
365 err = EINVAL;
366 x = -1;
367 end:
368 errno = err;
369 return x;
370 }
371