| 1 | /* |
| 2 | ** Copyright 2003 Double Precision, Inc. |
| 3 | ** See COPYING for distribution information. |
| 4 | ** |
| 5 | ** $Id: utf7.c,v 1.3 2004/05/23 14:28:25 mrsam Exp $ |
| 6 | */ |
| 7 | |
| 8 | #include "unicode.h" |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #include <errno.h> |
| 13 | |
| 14 | static const char base64tab[]= |
| 15 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 16 | |
| 17 | struct dec_base64_struct { |
| 18 | |
| 19 | unsigned char base64buf[4]; |
| 20 | int cnt; |
| 21 | |
| 22 | unicode_char uc1; |
| 23 | int ucnt; |
| 24 | |
| 25 | int flushing; |
| 26 | int flushed; |
| 27 | }; |
| 28 | |
| 29 | /* Poor man's base64 decoder */ |
| 30 | |
| 31 | static int dec_b64_uchar(struct dec_base64_struct *dc, |
| 32 | unsigned char uuc, |
| 33 | unicode_char **buffer, |
| 34 | size_t *buflen) |
| 35 | { |
| 36 | if (dc->flushed) |
| 37 | return 0; /* Flushing trailing junk */ |
| 38 | |
| 39 | dc->uc1 <<= 8; |
| 40 | dc->uc1 |= uuc; |
| 41 | |
| 42 | ++dc->ucnt; |
| 43 | |
| 44 | if (dc->ucnt == 2) |
| 45 | { |
| 46 | if (dc->uc1 < 0xD800 || dc->uc1 > 0xDFFF) |
| 47 | /* Not surrogate pair */ |
| 48 | { |
| 49 | if ( *buffer ) |
| 50 | (*buffer)[*buflen]=dc->uc1; |
| 51 | ++*buflen; |
| 52 | dc->uc1=0; |
| 53 | dc->ucnt=0; |
| 54 | if (dc->flushing) |
| 55 | dc->flushed=1; |
| 56 | return (0); |
| 57 | } |
| 58 | |
| 59 | if (dc->uc1 > 0xDBFF) |
| 60 | return -1; /* Bad surrogate pair */ |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | if (dc->ucnt == 4) |
| 65 | { |
| 66 | unicode_char uc2= (dc->uc1 >> 16) & 0xFFFF; |
| 67 | |
| 68 | dc->uc1 &= 0xFFFF; |
| 69 | |
| 70 | if (dc->uc1 < 0xDC00 || dc->uc1 > 0xDFFF) |
| 71 | return -1; |
| 72 | |
| 73 | |
| 74 | if (*buffer) |
| 75 | { |
| 76 | (*buffer)[*buflen] = ((uc2 & 0x3FF) << 10) | |
| 77 | (dc->uc1 & 0x3FF); |
| 78 | } |
| 79 | ++*buflen; |
| 80 | |
| 81 | dc->uc1=0; |
| 82 | dc->ucnt=0; |
| 83 | if (dc->flushing) |
| 84 | dc->flushed=1; |
| 85 | return (0); |
| 86 | } |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static int dec_b64_char(struct dec_base64_struct *dc, |
| 91 | char c, |
| 92 | unicode_char **buffer, |
| 93 | size_t *buflen) |
| 94 | { |
| 95 | dc->base64buf[dc->cnt]=c; |
| 96 | if (++dc->cnt >= 4) /* Four characters to base64 decode */ |
| 97 | { |
| 98 | char a,b,c; |
| 99 | |
| 100 | int w=dc->base64buf[0]; |
| 101 | int x=dc->base64buf[1]; |
| 102 | int y=dc->base64buf[2]; |
| 103 | int z=dc->base64buf[3]; |
| 104 | |
| 105 | a= (w << 2) | (x >> 4); |
| 106 | b= (x << 4) | (y >> 2); |
| 107 | c= (y << 6) | z; |
| 108 | dc->cnt=0; |
| 109 | |
| 110 | if (dec_b64_uchar(dc, a, buffer, buflen)) |
| 111 | return -1; |
| 112 | |
| 113 | if (dec_b64_uchar(dc, b, buffer, buflen)) |
| 114 | return -1; |
| 115 | |
| 116 | if (dec_b64_uchar(dc, c, buffer, buflen)) |
| 117 | return -1; |
| 118 | } |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | static unicode_char *tou(const struct unicode_info *foo, const char *p, |
| 123 | int *err) |
| 124 | { |
| 125 | int pass; |
| 126 | size_t i; |
| 127 | unicode_char *buffer=NULL; |
| 128 | size_t buflen=0; |
| 129 | |
| 130 | /* Two passes. Count the output, alloc buffer, do it */ |
| 131 | |
| 132 | for (pass=0; pass<2; pass++) |
| 133 | { |
| 134 | if (pass) |
| 135 | { |
| 136 | if ((buffer=malloc((buflen+1)*sizeof(unicode_char))) |
| 137 | == NULL) |
| 138 | return NULL; |
| 139 | } |
| 140 | buflen=0; |
| 141 | |
| 142 | for (i=0; p[i]; i++) |
| 143 | { |
| 144 | char *q; |
| 145 | struct dec_base64_struct dc; |
| 146 | |
| 147 | if (p[i] != '+') |
| 148 | { |
| 149 | if (buffer) |
| 150 | { |
| 151 | buffer[buflen]=(unsigned char)p[i]; |
| 152 | } |
| 153 | ++buflen; |
| 154 | continue; |
| 155 | } |
| 156 | |
| 157 | if (p[++i] == 0) |
| 158 | break; |
| 159 | |
| 160 | if (p[i] == '-') |
| 161 | { |
| 162 | if (buffer) |
| 163 | buffer[buflen]='+'; |
| 164 | ++buflen; |
| 165 | continue; |
| 166 | } |
| 167 | |
| 168 | dc.cnt=0; |
| 169 | dc.ucnt=0; |
| 170 | dc.uc1=0; |
| 171 | dc.flushing=0; |
| 172 | dc.flushed=0; |
| 173 | |
| 174 | while ( p[i] && (q=strchr(base64tab, p[i])) != NULL) |
| 175 | { |
| 176 | if (dec_b64_char(&dc, (q-base64tab), |
| 177 | &buffer, |
| 178 | &buflen)) |
| 179 | { |
| 180 | if (err) |
| 181 | { |
| 182 | *err=i; |
| 183 | errno=EINVAL; |
| 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | /* Recover from decoding error */ |
| 188 | |
| 189 | dc.cnt=0; |
| 190 | dc.ucnt=0; |
| 191 | dc.uc1=0; |
| 192 | } |
| 193 | ++i; |
| 194 | } |
| 195 | |
| 196 | dc.flushing=1; |
| 197 | |
| 198 | while (dc.cnt > 0) |
| 199 | { |
| 200 | if (dec_b64_char(&dc, 0, |
| 201 | &buffer, |
| 202 | &buflen)) |
| 203 | { |
| 204 | if (err) |
| 205 | { |
| 206 | *err=i; |
| 207 | errno=EINVAL; |
| 208 | return NULL; |
| 209 | } |
| 210 | dc.cnt=0; |
| 211 | dc.ucnt=0; |
| 212 | dc.uc1=0; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | if (p[i] == 0) |
| 217 | break; |
| 218 | |
| 219 | if (p[i] != '-') |
| 220 | --i; |
| 221 | } |
| 222 | |
| 223 | |
| 224 | if (pass) |
| 225 | buffer[buflen]=0; |
| 226 | } |
| 227 | |
| 228 | return buffer; |
| 229 | } |
| 230 | |
| 231 | /* Poor man's base64 encoder */ |
| 232 | |
| 233 | struct enc_base64_struct { |
| 234 | |
| 235 | char base64buf[3]; |
| 236 | int cnt; |
| 237 | int clip; |
| 238 | }; |
| 239 | |
| 240 | static void encode_base64_char(struct enc_base64_struct *p, |
| 241 | char c, |
| 242 | char **buffer, |
| 243 | size_t *buflen) |
| 244 | { |
| 245 | p->base64buf[p->cnt]=c; |
| 246 | |
| 247 | if (++p->cnt >= 3) /* Encode three octets in base64 */ |
| 248 | { |
| 249 | int a, b, c; |
| 250 | int d, e, f, g; |
| 251 | |
| 252 | a=(unsigned char)p->base64buf[0]; |
| 253 | b=(unsigned char)p->base64buf[1]; |
| 254 | c=(unsigned char)p->base64buf[2]; |
| 255 | |
| 256 | d=base64tab[ a >> 2 ]; |
| 257 | e=base64tab[ ((a & 3 ) << 4) | (b >> 4)]; |
| 258 | f=base64tab[ ((b & 15) << 2) | (c >> 6)]; |
| 259 | g=base64tab[ c & 63 ]; |
| 260 | |
| 261 | p->cnt=0; |
| 262 | |
| 263 | if (*buffer) |
| 264 | { |
| 265 | (*buffer)[*buflen]=d; |
| 266 | (*buffer)[*buflen+1]=e; |
| 267 | } |
| 268 | *buflen += 2; |
| 269 | |
| 270 | if (p->clip < 2) /* Clip trailing junk, don't need it */ |
| 271 | { |
| 272 | if (*buffer) |
| 273 | { |
| 274 | (*buffer)[*buflen]=f; |
| 275 | } |
| 276 | ++*buflen; |
| 277 | } |
| 278 | |
| 279 | if (p->clip < 1) |
| 280 | { |
| 281 | if (*buffer) |
| 282 | { |
| 283 | (*buffer)[*buflen]=g; |
| 284 | } |
| 285 | ++*buflen; |
| 286 | } |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | static void encode_base64_u16(struct enc_base64_struct *p, |
| 291 | unicode_char uc, |
| 292 | char **buffer, |
| 293 | size_t *buflen) |
| 294 | { |
| 295 | encode_base64_char(p, (uc >> 8) & 255, buffer, buflen); |
| 296 | encode_base64_char(p, uc & 255, buffer, buflen); |
| 297 | } |
| 298 | |
| 299 | static void encode_base64_u32(struct enc_base64_struct *p, |
| 300 | unicode_char uc, |
| 301 | char **buffer, |
| 302 | size_t *buflen) |
| 303 | { |
| 304 | if ((uc >= 0xD800 && uc <= 0xDFFF) /* Really illegal, but punt */ |
| 305 | || uc > 0xFFFFU) |
| 306 | { |
| 307 | encode_base64_u16(p, ((uc >> 10) & 0x3FF) | 0xD800, |
| 308 | buffer, buflen); |
| 309 | encode_base64_u16(p, (uc & 0x3FF) | 0xDC00, |
| 310 | buffer, buflen); |
| 311 | } |
| 312 | else |
| 313 | { |
| 314 | encode_base64_u16(p, uc, buffer, buflen); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | |
| 319 | #define LITERAL(c) ( (c) == '\n' || (c) == '\r' || (c) == '\t' || (c) == ' ' \ |
| 320 | || ( (c) >= 33 && c <= 125 && c != 92)) |
| 321 | |
| 322 | static char *fromu(const struct unicode_info *foo, const unicode_char *p, |
| 323 | int *err) |
| 324 | { |
| 325 | char *buffer=0; |
| 326 | size_t buflen=0; |
| 327 | int pass; |
| 328 | size_t i; |
| 329 | |
| 330 | for (pass=0; pass<2; pass++) |
| 331 | { |
| 332 | if (pass) |
| 333 | { |
| 334 | if ((buffer=malloc(buflen+1)) == NULL) |
| 335 | return NULL; |
| 336 | } |
| 337 | buflen=0; |
| 338 | |
| 339 | for (i=0; p[i]; i++) |
| 340 | { |
| 341 | struct enc_base64_struct eb; |
| 342 | |
| 343 | if (p[i] == '+') |
| 344 | { |
| 345 | if (pass) |
| 346 | { |
| 347 | buffer[buflen]='+'; |
| 348 | buffer[buflen+1]='-'; |
| 349 | } |
| 350 | buflen += 2; |
| 351 | continue; |
| 352 | } |
| 353 | |
| 354 | if (LITERAL(p[i])) |
| 355 | { |
| 356 | if (pass) |
| 357 | { |
| 358 | buffer[buflen]=(char)p[i]; |
| 359 | } |
| 360 | ++buflen; |
| 361 | continue; |
| 362 | } |
| 363 | |
| 364 | if (pass) |
| 365 | buffer[buflen]='+'; |
| 366 | ++buflen; |
| 367 | |
| 368 | eb.cnt=0; |
| 369 | eb.clip=0; |
| 370 | |
| 371 | do |
| 372 | { |
| 373 | if (p[i] >= 0x10FFFF) |
| 374 | { |
| 375 | if (err) |
| 376 | { |
| 377 | *err=i; |
| 378 | errno=EINVAL; |
| 379 | return NULL; |
| 380 | } |
| 381 | encode_base64_u32(&eb, 0xFFFD, |
| 382 | &buffer, &buflen); |
| 383 | } |
| 384 | else |
| 385 | { |
| 386 | encode_base64_u32(&eb, p[i], |
| 387 | &buffer, &buflen); |
| 388 | } |
| 389 | ++i; |
| 390 | } while ( p[i] && !LITERAL(p[i])); |
| 391 | |
| 392 | switch (eb.cnt) { |
| 393 | case 2: |
| 394 | eb.clip=2; |
| 395 | break; |
| 396 | case 3: |
| 397 | eb.clip=1; |
| 398 | break; |
| 399 | } |
| 400 | |
| 401 | while (eb.cnt) |
| 402 | { |
| 403 | encode_base64_char(&eb, 0, &buffer, &buflen); |
| 404 | } |
| 405 | |
| 406 | if (!p[i]) |
| 407 | { |
| 408 | if (pass) |
| 409 | { |
| 410 | buffer[buflen]='-'; |
| 411 | } |
| 412 | ++buflen; |
| 413 | break; |
| 414 | } |
| 415 | |
| 416 | if (p[i] == '-') |
| 417 | { |
| 418 | if (pass) |
| 419 | { |
| 420 | buffer[buflen]='-'; |
| 421 | } |
| 422 | ++buflen; |
| 423 | } |
| 424 | --i; |
| 425 | } |
| 426 | |
| 427 | if (pass) |
| 428 | buffer[buflen]=0; |
| 429 | } |
| 430 | |
| 431 | return buffer; |
| 432 | } |
| 433 | |
| 434 | |
| 435 | /* |
| 436 | ** UTF7.toupper/tolower/totitle is implemented by converting UTF8 to |
| 437 | ** UCS-4, applying the unicode table lookup, then converting it back to |
| 438 | ** UTF7 |
| 439 | */ |
| 440 | |
| 441 | static char *toupper_func(const struct unicode_info *u, |
| 442 | const char *cp, int *ip) |
| 443 | { |
| 444 | unicode_char *uc=tou(u, cp, ip), *p; |
| 445 | char *s; |
| 446 | |
| 447 | if (!uc) return (0); |
| 448 | |
| 449 | for (p=uc; *p; p++) |
| 450 | *p=unicode_uc(*p); |
| 451 | |
| 452 | s=fromu(u, uc, NULL); |
| 453 | if (!s && ip) |
| 454 | *ip=0; |
| 455 | free(uc); |
| 456 | return (s); |
| 457 | } |
| 458 | |
| 459 | static char *tolower_func(const struct unicode_info *u, |
| 460 | const char *cp, int *ip) |
| 461 | { |
| 462 | unicode_char *uc=tou(u, cp, ip), *p; |
| 463 | char *s; |
| 464 | |
| 465 | if (!uc) return (0); |
| 466 | |
| 467 | for (p=uc; *p; p++) |
| 468 | *p=unicode_lc(*p); |
| 469 | |
| 470 | s=fromu(u, uc, NULL); |
| 471 | free(uc); |
| 472 | if (!s && ip) |
| 473 | *ip=0; |
| 474 | return (s); |
| 475 | } |
| 476 | |
| 477 | static char *totitle_func(const struct unicode_info *u, |
| 478 | const char *cp, int *ip) |
| 479 | { |
| 480 | unicode_char *uc=tou(u, cp, ip), *p; |
| 481 | char *s; |
| 482 | |
| 483 | if (!uc) return (0); |
| 484 | |
| 485 | for (p=uc; *p; p++) |
| 486 | *p=unicode_tc(*p); |
| 487 | |
| 488 | s=fromu(u, uc, NULL); |
| 489 | if (!s && ip) |
| 490 | *ip=0; |
| 491 | free(uc); |
| 492 | return (s); |
| 493 | } |
| 494 | |
| 495 | const struct unicode_info unicode_UTF7 = { |
| 496 | "UTF-7", |
| 497 | UNICODE_UTF | UNICODE_MB | |
| 498 | UNICODE_HEADER_QUOPRI | UNICODE_BODY_QUOPRI, |
| 499 | tou, |
| 500 | fromu, |
| 501 | toupper_func, |
| 502 | tolower_func, |
| 503 | totitle_func}; |
| 504 | |
| 505 | #if 0 |
| 506 | extern const struct unicode_info unicode_UTF8; |
| 507 | |
| 508 | int main(int argc, char **argv) |
| 509 | { |
| 510 | char *a, *b, *c; |
| 511 | |
| 512 | a=unicode_xconvert("A+ImIDkQ.", &unicode_UTF7, |
| 513 | &unicode_UTF8); |
| 514 | b=unicode_xconvert("Hi Mom -+Jjo--!", &unicode_UTF7, |
| 515 | &unicode_UTF8); |
| 516 | c=unicode_xconvert("+ZeVnLIqe-", &unicode_UTF7, |
| 517 | &unicode_UTF8); |
| 518 | |
| 519 | printf("%s\n", a); |
| 520 | printf("%s\n", b); |
| 521 | printf("%s\n", c); |
| 522 | |
| 523 | printf("%s\n", unicode_xconvert(a, &unicode_UTF8, &unicode_UTF7)); |
| 524 | printf("%s\n", unicode_xconvert(b, &unicode_UTF8, &unicode_UTF7)); |
| 525 | printf("%s\n", unicode_xconvert(c, &unicode_UTF8, &unicode_UTF7)); |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | #endif |