1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
|
/* Convert using charmaps and possibly iconv().
Copyright (C) 2001-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <iconv.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "iconv_prog.h"
/* Prototypes for a few program-wide used functions. */
#include <programs/xmalloc.h>
struct convtable
{
int term[256 / 8];
union
{
struct convtable *sub;
struct charseq *out;
} val[256];
};
static inline struct convtable *
allocate_table (void)
{
return (struct convtable *) xcalloc (1, sizeof (struct convtable));
}
static inline int
is_term (struct convtable *tbl, unsigned int idx)
{
return tbl->term[idx / 8] & (1 << (idx % 8));
}
static inline void
clear_term (struct convtable *tbl, unsigned int idx)
{
tbl->term[idx / 8] &= ~(1 << (idx % 8));
}
static inline void
set_term (struct convtable *tbl, unsigned int idx)
{
tbl->term[idx / 8] |= 1 << (idx % 8);
}
/* Generate the conversion table. */
static struct convtable *use_from_charmap (struct charmap_t *from_charmap,
const char *to_code);
static struct convtable *use_to_charmap (const char *from_code,
struct charmap_t *to_charmap);
static struct convtable *use_both_charmaps (struct charmap_t *from_charmap,
struct charmap_t *to_charmap);
/* Prototypes for the functions doing the actual work. */
static int process_block (struct convtable *tbl, char *addr, size_t len,
FILE *output);
static int process_fd (struct convtable *tbl, int fd, FILE *output);
static int process_file (struct convtable *tbl, FILE *input, FILE *output);
int
charmap_conversion (const char *from_code, struct charmap_t *from_charmap,
const char *to_code, struct charmap_t *to_charmap,
int argc, int remaining, char *argv[],
const char *output_file)
{
struct convtable *cvtbl;
int status = EXIT_SUCCESS;
/* We have three different cases to handle:
- both, from_charmap and to_charmap, are available. This means we
can assume that the symbolic names match and use them to create
the mapping.
- only from_charmap is available. In this case we can only hope that
the symbolic names used are of the <Uxxxx> form in which case we
can use a UCS4->"to_code" iconv() conversion for the second step.
- only to_charmap is available. This is similar, only that we would
use iconv() for the "to_code"->UCS4 conversion.
We first create a table which maps input bytes into output bytes.
Once this is done we can handle all three of the cases above
equally. */
if (from_charmap != NULL)
{
if (to_charmap == NULL)
cvtbl = use_from_charmap (from_charmap, to_code);
else
cvtbl = use_both_charmaps (from_charmap, to_charmap);
}
else
{
assert (to_charmap != NULL);
cvtbl = use_to_charmap (from_code, to_charmap);
}
/* If we couldn't generate a table stop now. */
if (cvtbl == NULL)
return EXIT_FAILURE;
/* Determine output file. */
FILE *output;
if (output_file != NULL && strcmp (output_file, "-") != 0)
{
output = fopen (output_file, "w");
if (output == NULL)
error (EXIT_FAILURE, errno, _("cannot open output file"));
}
else
output = stdout;
/* We can now start the conversion. */
if (remaining == argc)
{
if (process_file (cvtbl, stdin, output) != 0)
status = EXIT_FAILURE;
}
else
do
{
int fd;
if (verbose)
printf ("%s:\n", argv[remaining]);
if (strcmp (argv[remaining], "-") == 0)
fd = 0;
else
{
fd = open (argv[remaining], O_RDONLY);
if (fd == -1)
{
error (0, errno, _("cannot open input file `%s'"),
argv[remaining]);
status = EXIT_FAILURE;
continue;
}
}
#ifdef _POSIX_MAPPED_FILES
struct stat64 st;
char *addr;
/* We have possibilities for reading the input file. First try
to mmap() it since this will provide the fastest solution. */
if (fstat64 (fd, &st) == 0
&& ((addr = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE,
fd, 0)) != MAP_FAILED))
{
/* Yes, we can use mmap(). The descriptor is not needed
anymore. */
if (close (fd) != 0)
error (EXIT_FAILURE, errno,
_("error while closing input `%s'"), argv[remaining]);
if (process_block (cvtbl, addr, st.st_size, output) < 0)
{
/* Something went wrong. */
status = EXIT_FAILURE;
/* We don't need the input data anymore. */
munmap ((void *) addr, st.st_size);
/* We cannot go on with producing output since it might
lead to problem because the last output might leave
the output stream in an undefined state. */
break;
}
/* We don't need the input data anymore. */
munmap ((void *) addr, st.st_size);
}
else
#endif /* _POSIX_MAPPED_FILES */
{
/* Read the file in pieces. */
if (process_fd (cvtbl, fd, output) != 0)
{
/* Something went wrong. */
status = EXIT_FAILURE;
/* We don't need the input file anymore. */
close (fd);
/* We cannot go on with producing output since it might
lead to problem because the last output might leave
the output stream in an undefined state. */
break;
}
/* Now close the file. */
close (fd);
}
}
while (++remaining < argc);
/* All done. */
return status;
}
/* Add the IN->OUT mapping to TBL. OUT is potentially stored in the table.
IN is used only here, so it need not be kept live afterwards. */
static void
add_bytes (struct convtable *tbl, const struct charseq *in, struct charseq *out)
{
int n = 0;
unsigned int byte;
assert (in->nbytes > 0);
byte = ((unsigned char *) in->bytes)[n];
while (n + 1 < in->nbytes)
{
if (is_term (tbl, byte) || tbl->val[byte].sub == NULL)
{
/* Note that we simply ignore a definition for a byte sequence
which is also the prefix for a longer one. */
clear_term (tbl, byte);
tbl->val[byte].sub =
(struct convtable *) xcalloc (1, sizeof (struct convtable));
}
tbl = tbl->val[byte].sub;
byte = ((unsigned char *) in->bytes)[++n];
}
/* Only add the new sequence if there is none yet and the byte sequence
is not part of an even longer one. */
if (! is_term (tbl, byte) && tbl->val[byte].sub == NULL)
{
set_term (tbl, byte);
tbl->val[byte].out = out;
}
}
/* Try to convert SEQ from WCHAR_T format using CD.
Returns a malloc'd struct or NULL. */
static struct charseq *
convert_charseq (iconv_t cd, const struct charseq *seq)
{
struct charseq *result = NULL;
if (seq->ucs4 != UNINITIALIZED_CHAR_VALUE)
{
/* There is a chance. Try the iconv module. */
wchar_t inbuf[1] = { seq->ucs4 };
unsigned char outbuf[64];
char *inptr = (char *) inbuf;
size_t inlen = sizeof (inbuf);
char *outptr = (char *) outbuf;
size_t outlen = sizeof (outbuf);
(void) iconv (cd, &inptr, &inlen, &outptr, &outlen);
if (outptr != (char *) outbuf)
{
/* We got some output. Good, use it. */
outlen = sizeof (outbuf) - outlen;
assert ((char *) outbuf + outlen == outptr);
result = xmalloc (sizeof (struct charseq) + outlen);
result->name = seq->name;
result->ucs4 = seq->ucs4;
result->nbytes = outlen;
memcpy (result->bytes, outbuf, outlen);
}
/* Clear any possible state left behind. */
(void) iconv (cd, NULL, NULL, NULL, NULL);
}
return result;
}
static struct convtable *
use_from_charmap (struct charmap_t *from_charmap, const char *to_code)
{
/* We iterate over all entries in the from_charmap and for those which
have a known UCS4 representation we use an iconv() call to determine
the mapping to the to_code charset. */
struct convtable *rettbl;
iconv_t cd;
void *ptr = NULL;
const void *key;
size_t keylen;
void *data;
cd = iconv_open (to_code, "WCHAR_T");
if (cd == (iconv_t) -1)
/* We cannot do anything. */
return NULL;
rettbl = allocate_table ();
while (iterate_table (&from_charmap->char_table, &ptr, &key, &keylen, &data)
>= 0)
{
struct charseq *in = data;
struct charseq *newp = convert_charseq (cd, in);
if (newp != NULL)
add_bytes (rettbl, in, newp);
}
iconv_close (cd);
return rettbl;
}
static struct convtable *
use_to_charmap (const char *from_code, struct charmap_t *to_charmap)
{
/* We iterate over all entries in the to_charmap and for those which
have a known UCS4 representation we use an iconv() call to determine
the mapping to the from_code charset. */
struct convtable *rettbl;
iconv_t cd;
void *ptr = NULL;
const void *key;
size_t keylen;
void *data;
/* Note that the conversion we use here is the reverse direction. Without
exhaustive search we cannot figure out which input yields the UCS4
character we are looking for. Therefore we determine it the other
way round. */
cd = iconv_open (from_code, "WCHAR_T");
if (cd == (iconv_t) -1)
/* We cannot do anything. */
return NULL;
rettbl = allocate_table ();
while (iterate_table (&to_charmap->char_table, &ptr, &key, &keylen, &data)
>= 0)
{
struct charseq *out = data;
struct charseq *newp = convert_charseq (cd, out);
if (newp != NULL)
{
add_bytes (rettbl, newp, out);
free (newp);
}
}
iconv_close (cd);
return rettbl;
}
static struct convtable *
use_both_charmaps (struct charmap_t *from_charmap,
struct charmap_t *to_charmap)
{
/* In this case we iterate over all the entries in the from_charmap,
determine the internal name, and find an appropriate entry in the
to_charmap (if it exists). */
struct convtable *rettbl = allocate_table ();
void *ptr = NULL;
const void *key;
size_t keylen;
void *data;
while (iterate_table (&from_charmap->char_table, &ptr, &key, &keylen, &data)
>= 0)
{
struct charseq *in = (struct charseq *) data;
struct charseq *out = charmap_find_value (to_charmap, key, keylen);
if (out != NULL)
add_bytes (rettbl, in, out);
}
return rettbl;
}
static int
process_block (struct convtable *tbl, char *addr, size_t len, FILE *output)
{
size_t n = 0;
while (n < len)
{
struct convtable *cur = tbl;
unsigned char *curp = (unsigned char *) addr;
unsigned int byte = *curp;
int cnt;
struct charseq *out;
while (! is_term (cur, byte))
if (cur->val[byte].sub == NULL)
{
/* This is an invalid sequence. Skip the first byte if we are
ignoring errors. Otherwise punt. */
if (! omit_invalid)
{
error (0, 0, _("illegal input sequence at position %Zd"), n);
return -1;
}
n -= curp - (unsigned char *) addr;
byte = *(curp = (unsigned char *) ++addr);
if (++n >= len)
/* All converted. */
return 0;
cur = tbl;
}
else
{
cur = cur->val[byte].sub;
if (++n >= len)
{
error (0, 0, _("\
incomplete character or shift sequence at end of buffer"));
return -1;
}
byte = *++curp;
}
/* We found a final byte. Write the output bytes. */
out = cur->val[byte].out;
for (cnt = 0; cnt < out->nbytes; ++cnt)
fputc_unlocked (out->bytes[cnt], output);
addr = (char *) curp + 1;
++n;
}
return 0;
}
static int
process_fd (struct convtable *tbl, int fd, FILE *output)
{
/* We have a problem with reading from a descriptor since we must not
provide the iconv() function an incomplete character or shift
sequence at the end of the buffer. Since we have to deal with
arbitrary encodings we must read the whole text in a buffer and
process it in one step. */
static char *inbuf = NULL;
static size_t maxlen = 0;
char *inptr = inbuf;
size_t actlen = 0;
while (actlen < maxlen)
{
ssize_t n = read (fd, inptr, maxlen - actlen);
if (n == 0)
/* No more text to read. */
break;
if (n == -1)
{
/* Error while reading. */
error (0, errno, _("error while reading the input"));
return -1;
}
inptr += n;
actlen += n;
}
if (actlen == maxlen)
while (1)
{
ssize_t n;
char *new_inbuf;
/* Increase the buffer. */
new_inbuf = (char *) realloc (inbuf, maxlen + 32768);
if (new_inbuf == NULL)
{
error (0, errno, _("unable to allocate buffer for input"));
return -1;
}
inbuf = new_inbuf;
maxlen += 32768;
inptr = inbuf + actlen;
do
{
n = read (fd, inptr, maxlen - actlen);
if (n == 0)
/* No more text to read. */
break;
if (n == -1)
{
/* Error while reading. */
error (0, errno, _("error while reading the input"));
return -1;
}
inptr += n;
actlen += n;
}
while (actlen < maxlen);
if (n == 0)
/* Break again so we leave both loops. */
break;
}
/* Now we have all the input in the buffer. Process it in one run. */
return process_block (tbl, inbuf, actlen, output);
}
static int
process_file (struct convtable *tbl, FILE *input, FILE *output)
{
/* This should be safe since we use this function only for `stdin' and
we haven't read anything so far. */
return process_fd (tbl, fileno (input), output);
}
|