iconv/gconv_simple.c

   1 /* Simple transformations functions.
   2    Copyright (C) 1997-2005, 2007, 2008, 2009, 2011, 2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <byteswap.h>
  21 #include <dlfcn.h>
  22 #include <endian.h>
  23 #include <errno.h>
  24 #include <gconv.h>
  25 #include <stdint.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <wchar.h>
  29 #include <sys/param.h>
  30 #include <gconv_int.h>
  31
  32 #define BUILTIN_ALIAS(s1, s2) /* nothing */
  33 #define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
  34                                MinF, MaxF, MinT, MaxT) \
  35   extern int Fct (struct __gconv_step *, struct __gconv_step_data *,          \
  36                   const unsigned char **, const unsigned char *,              \
  37                   unsigned char **, size_t *, int, int);
  38 #include "gconv_builtin.h"
  39
  40
  41 #ifndef EILSEQ
  42 # define EILSEQ EINVAL
  43 #endif
  44
  45
  46 /* Specialized conversion function for a single byte to INTERNAL, recognizing
  47    only ASCII characters.  */
  48 wint_t
  49 __gconv_btwoc_ascii (struct __gconv_step *step, unsigned char c)
  50 {
  51   if (c < 0x80)
  52     return c;
  53   else
  54     return WEOF;
  55 }
  56
  57
  58 /* Transform from the internal, UCS4-like format, to UCS4.  The
  59    difference between the internal ucs4 format and the real UCS4
  60    format is, if any, the endianess.  The Unicode/ISO 10646 says that
  61    unless some higher protocol specifies it differently, the byte
  62    order is big endian.*/
  63 #define DEFINE_INIT             0
  64 #define DEFINE_FINI             0
  65 #define MIN_NEEDED_FROM         4
  66 #define MIN_NEEDED_TO           4
  67 #define FROM_DIRECTION          1
  68 #define FROM_LOOP               internal_ucs4_loop
  69 #define TO_LOOP                 internal_ucs4_loop /* This is not used.  */
  70 #define FUNCTION_NAME           __gconv_transform_internal_ucs4
  71
  72
  73 static inline int
  74 __attribute ((always_inline))
  75 internal_ucs4_loop (struct __gconv_step *step,
  76                     struct __gconv_step_data *step_data,
  77                     const unsigned char **inptrp, const unsigned char *inend,
  78                     unsigned char **outptrp, unsigned char *outend,
  79                     size_t *irreversible)
  80 {
  81   const unsigned char *inptr = *inptrp;
  82   unsigned char *outptr = *outptrp;
  83   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
  84   int result;
  85
  86 #if __BYTE_ORDER == __LITTLE_ENDIAN
  87   /* Sigh, we have to do some real work.  */
  88   size_t cnt;
  89   uint32_t *outptr32 = (uint32_t *) outptr;
  90
  91   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
  92     *outptr32++ = bswap_32 (*(const uint32_t *) inptr);
  93
  94   *inptrp = inptr;
  95   *outptrp = (unsigned char *) outptr32;
  96 #elif __BYTE_ORDER == __BIG_ENDIAN
  97   /* Simply copy the data.  */
  98   *inptrp = inptr + n_convert * 4;
  99   *outptrp = __mempcpy (outptr, inptr, n_convert * 4);
 100 #else
 101 # error "This endianess is not supported."
 102 #endif
 103
 104   /* Determine the status.  */
 105   if (*inptrp == inend)
 106     result = __GCONV_EMPTY_INPUT;
 107   else if (*outptrp + 4 > outend)
 108     result = __GCONV_FULL_OUTPUT;
 109   else
 110     result = __GCONV_INCOMPLETE_INPUT;
 111
 112   return result;
 113 }
 114
 115 #ifndef _STRING_ARCH_unaligned
 116 static inline int
 117 __attribute ((always_inline))
 118 internal_ucs4_loop_unaligned (struct __gconv_step *step,
 119                               struct __gconv_step_data *step_data,
 120                               const unsigned char **inptrp,
 121                               const unsigned char *inend,
 122                               unsigned char **outptrp, unsigned char *outend,
 123                               size_t *irreversible)
 124 {
 125   const unsigned char *inptr = *inptrp;
 126   unsigned char *outptr = *outptrp;
 127   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 128   int result;
 129
 130 # if __BYTE_ORDER == __LITTLE_ENDIAN
 131   /* Sigh, we have to do some real work.  */
 132   size_t cnt;
 133
 134   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4, outptr += 4)
 135     {
 136       outptr[0] = inptr[3];
 137       outptr[1] = inptr[2];
 138       outptr[2] = inptr[1];
 139       outptr[3] = inptr[0];
 140     }
 141
 142   *inptrp = inptr;
 143   *outptrp = outptr;
 144 # elif __BYTE_ORDER == __BIG_ENDIAN
 145   /* Simply copy the data.  */
 146   *inptrp = inptr + n_convert * 4;
 147   *outptrp = __mempcpy (outptr, inptr, n_convert * 4);
 148 # else
 149 #  error "This endianess is not supported."
 150 # endif
 151
 152   /* Determine the status.  */
 153   if (*inptrp == inend)
 154     result = __GCONV_EMPTY_INPUT;
 155   else if (*outptrp + 4 > outend)
 156     result = __GCONV_FULL_OUTPUT;
 157   else
 158     result = __GCONV_INCOMPLETE_INPUT;
 159
 160   return result;
 161 }
 162 #endif
 163
 164
 165 static inline int
 166 __attribute ((always_inline))
 167 internal_ucs4_loop_single (struct __gconv_step *step,
 168                            struct __gconv_step_data *step_data,
 169                            const unsigned char **inptrp,
 170                            const unsigned char *inend,
 171                            unsigned char **outptrp, unsigned char *outend,
 172                            size_t *irreversible)
 173 {
 174   mbstate_t *state = step_data->__statep;
 175   size_t cnt = state->__count & 7;
 176
 177   while (*inptrp < inend && cnt < 4)
 178     state->__value.__wchb[cnt++] = *(*inptrp)++;
 179
 180   if (__builtin_expect (cnt < 4, 0))
 181     {
 182       /* Still not enough bytes.  Store the ones in the input buffer.  */
 183       state->__count &= ~7;
 184       state->__count |= cnt;
 185
 186       return __GCONV_INCOMPLETE_INPUT;
 187     }
 188
 189 #if __BYTE_ORDER == __LITTLE_ENDIAN
 190   (*outptrp)[0] = state->__value.__wchb[3];
 191   (*outptrp)[1] = state->__value.__wchb[2];
 192   (*outptrp)[2] = state->__value.__wchb[1];
 193   (*outptrp)[3] = state->__value.__wchb[0];
 194
 195 #elif __BYTE_ORDER == __BIG_ENDIAN
 196   /* XXX unaligned */
 197   (*outptrp)[0] = state->__value.__wchb[0];
 198   (*outptrp)[1] = state->__value.__wchb[1];
 199   (*outptrp)[2] = state->__value.__wchb[2];
 200   (*outptrp)[3] = state->__value.__wchb[3];
 201 #else
 202 # error "This endianess is not supported."
 203 #endif
 204   *outptrp += 4;
 205
 206   /* Clear the state buffer.  */
 207   state->__count &= ~7;
 208
 209   return __GCONV_OK;
 210 }
 211
 212 #include <iconv/skeleton.c>
 213
 214
 215 /* Transform from UCS4 to the internal, UCS4-like format.  Unlike
 216    for the other direction we have to check for correct values here.  */
 217 #define DEFINE_INIT             0
 218 #define DEFINE_FINI             0
 219 #define MIN_NEEDED_FROM         4
 220 #define MIN_NEEDED_TO           4
 221 #define FROM_DIRECTION          1
 222 #define FROM_LOOP               ucs4_internal_loop
 223 #define TO_LOOP                 ucs4_internal_loop /* This is not used.  */
 224 #define FUNCTION_NAME           __gconv_transform_ucs4_internal
 225
 226
 227 static inline int
 228 __attribute ((always_inline))
 229 ucs4_internal_loop (struct __gconv_step *step,
 230                     struct __gconv_step_data *step_data,
 231                     const unsigned char **inptrp, const unsigned char *inend,
 232                     unsigned char **outptrp, unsigned char *outend,
 233                     size_t *irreversible)
 234 {
 235   int flags = step_data->__flags;
 236   const unsigned char *inptr = *inptrp;
 237   unsigned char *outptr = *outptrp;
 238   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 239   int result;
 240   size_t cnt;
 241
 242   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
 243     {
 244       uint32_t inval;
 245
 246 #if __BYTE_ORDER == __LITTLE_ENDIAN
 247       inval = bswap_32 (*(const uint32_t *) inptr);
 248 #else
 249       inval = *(const uint32_t *) inptr;
 250 #endif
 251
 252       if (__builtin_expect (inval > 0x7fffffff, 0))
 253         {
 254           /* The value is too large.  We don't try transliteration here since
 255              this is not an error because of the lack of possibilities to
 256              represent the result.  This is a genuine bug in the input since
 257              UCS4 does not allow such values.  */
 258           if (irreversible == NULL)
 259             /* We are transliterating, don't try to correct anything.  */
 260             return __GCONV_ILLEGAL_INPUT;
 261
 262           if (flags & __GCONV_IGNORE_ERRORS)
 263             {
 264               /* Just ignore this character.  */
 265               ++*irreversible;
 266               continue;
 267             }
 268
 269           *inptrp = inptr;
 270           *outptrp = outptr;
 271           return __GCONV_ILLEGAL_INPUT;
 272         }
 273
 274       *((uint32_t *) outptr) = inval;
 275       outptr += sizeof (uint32_t);
 276     }
 277
 278   *inptrp = inptr;
 279   *outptrp = outptr;
 280
 281   /* Determine the status.  */
 282   if (*inptrp == inend)
 283     result = __GCONV_EMPTY_INPUT;
 284   else if (*outptrp + 4 > outend)
 285     result = __GCONV_FULL_OUTPUT;
 286   else
 287     result = __GCONV_INCOMPLETE_INPUT;
 288
 289   return result;
 290 }
 291
 292 #ifndef _STRING_ARCH_unaligned
 293 static inline int
 294 __attribute ((always_inline))
 295 ucs4_internal_loop_unaligned (struct __gconv_step *step,
 296                               struct __gconv_step_data *step_data,
 297                               const unsigned char **inptrp,
 298                               const unsigned char *inend,
 299                               unsigned char **outptrp, unsigned char *outend,
 300                               size_t *irreversible)
 301 {
 302   int flags = step_data->__flags;
 303   const unsigned char *inptr = *inptrp;
 304   unsigned char *outptr = *outptrp;
 305   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 306   int result;
 307   size_t cnt;
 308
 309   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
 310     {
 311       if (__builtin_expect (inptr[0] > 0x80, 0))
 312         {
 313           /* The value is too large.  We don't try transliteration here since
 314              this is not an error because of the lack of possibilities to
 315              represent the result.  This is a genuine bug in the input since
 316              UCS4 does not allow such values.  */
 317           if (irreversible == NULL)
 318             /* We are transliterating, don't try to correct anything.  */
 319             return __GCONV_ILLEGAL_INPUT;
 320
 321           if (flags & __GCONV_IGNORE_ERRORS)
 322             {
 323               /* Just ignore this character.  */
 324               ++*irreversible;
 325               continue;
 326             }
 327
 328           *inptrp = inptr;
 329           *outptrp = outptr;
 330           return __GCONV_ILLEGAL_INPUT;
 331         }
 332
 333 # if __BYTE_ORDER == __LITTLE_ENDIAN
 334       outptr[3] = inptr[0];
 335       outptr[2] = inptr[1];
 336       outptr[1] = inptr[2];
 337       outptr[0] = inptr[3];
 338 # else
 339       outptr[0] = inptr[0];
 340       outptr[1] = inptr[1];
 341       outptr[2] = inptr[2];
 342       outptr[3] = inptr[3];
 343 # endif
 344       outptr += 4;
 345     }
 346
 347   *inptrp = inptr;
 348   *outptrp = outptr;
 349
 350   /* Determine the status.  */
 351   if (*inptrp == inend)
 352     result = __GCONV_EMPTY_INPUT;
 353   else if (*outptrp + 4 > outend)
 354     result = __GCONV_FULL_OUTPUT;
 355   else
 356     result = __GCONV_INCOMPLETE_INPUT;
 357
 358   return result;
 359 }
 360 #endif
 361
 362
 363 static inline int
 364 __attribute ((always_inline))
 365 ucs4_internal_loop_single (struct __gconv_step *step,
 366                            struct __gconv_step_data *step_data,
 367                            const unsigned char **inptrp,
 368                            const unsigned char *inend,
 369                            unsigned char **outptrp, unsigned char *outend,
 370                            size_t *irreversible)
 371 {
 372   mbstate_t *state = step_data->__statep;
 373   int flags = step_data->__flags;
 374   size_t cnt = state->__count & 7;
 375
 376   while (*inptrp < inend && cnt < 4)
 377     state->__value.__wchb[cnt++] = *(*inptrp)++;
 378
 379   if (__builtin_expect (cnt < 4, 0))
 380     {
 381       /* Still not enough bytes.  Store the ones in the input buffer.  */
 382       state->__count &= ~7;
 383       state->__count |= cnt;
 384
 385       return __GCONV_INCOMPLETE_INPUT;
 386     }
 387
 388   if (__builtin_expect (((unsigned char *) state->__value.__wchb)[0] > 0x80,
 389                         0))
 390     {
 391       /* The value is too large.  We don't try transliteration here since
 392          this is not an error because of the lack of possibilities to
 393          represent the result.  This is a genuine bug in the input since
 394          UCS4 does not allow such values.  */
 395       if (!(flags & __GCONV_IGNORE_ERRORS))
 396         {
 397           *inptrp -= cnt - (state->__count & 7);
 398           return __GCONV_ILLEGAL_INPUT;
 399         }
 400     }
 401   else
 402     {
 403 #if __BYTE_ORDER == __LITTLE_ENDIAN
 404       (*outptrp)[0] = state->__value.__wchb[3];
 405       (*outptrp)[1] = state->__value.__wchb[2];
 406       (*outptrp)[2] = state->__value.__wchb[1];
 407       (*outptrp)[3] = state->__value.__wchb[0];
 408 #elif __BYTE_ORDER == __BIG_ENDIAN
 409       (*outptrp)[0] = state->__value.__wchb[0];
 410       (*outptrp)[1] = state->__value.__wchb[1];
 411       (*outptrp)[2] = state->__value.__wchb[2];
 412       (*outptrp)[3] = state->__value.__wchb[3];
 413 #endif
 414
 415       *outptrp += 4;
 416     }
 417
 418   /* Clear the state buffer.  */
 419   state->__count &= ~7;
 420
 421   return __GCONV_OK;
 422 }
 423
 424 #include <iconv/skeleton.c>
 425
 426
 427 /* Similarly for the little endian form.  */
 428 #define DEFINE_INIT             0
 429 #define DEFINE_FINI             0
 430 #define MIN_NEEDED_FROM         4
 431 #define MIN_NEEDED_TO           4
 432 #define FROM_DIRECTION          1
 433 #define FROM_LOOP               internal_ucs4le_loop
 434 #define TO_LOOP                 internal_ucs4le_loop /* This is not used.  */
 435 #define FUNCTION_NAME           __gconv_transform_internal_ucs4le
 436
 437
 438 static inline int
 439 __attribute ((always_inline))
 440 internal_ucs4le_loop (struct __gconv_step *step,
 441                       struct __gconv_step_data *step_data,
 442                       const unsigned char **inptrp, const unsigned char *inend,
 443                       unsigned char **outptrp, unsigned char *outend,
 444                       size_t *irreversible)
 445 {
 446   const unsigned char *inptr = *inptrp;
 447   unsigned char *outptr = *outptrp;
 448   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 449   int result;
 450
 451 #if __BYTE_ORDER == __BIG_ENDIAN
 452   /* Sigh, we have to do some real work.  */
 453   size_t cnt;
 454   uint32_t *outptr32 = (uint32_t *) outptr;
 455
 456   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
 457     *outptr32++ = bswap_32 (*(const uint32_t *) inptr);
 458   outptr = (unsigned char *) outptr32;
 459
 460   *inptrp = inptr;
 461   *outptrp = outptr;
 462 #elif __BYTE_ORDER == __LITTLE_ENDIAN
 463   /* Simply copy the data.  */
 464   *inptrp = inptr + n_convert * 4;
 465   *outptrp = __mempcpy (outptr, inptr, n_convert * 4);
 466 #else
 467 # error "This endianess is not supported."
 468 #endif
 469
 470   /* Determine the status.  */
 471   if (*inptrp == inend)
 472     result = __GCONV_EMPTY_INPUT;
 473   else if (*outptrp + 4 > outend)
 474     result = __GCONV_FULL_OUTPUT;
 475   else
 476     result = __GCONV_INCOMPLETE_INPUT;
 477
 478   return result;
 479 }
 480
 481 #ifndef _STRING_ARCH_unaligned
 482 static inline int
 483 __attribute ((always_inline))
 484 internal_ucs4le_loop_unaligned (struct __gconv_step *step,
 485                                 struct __gconv_step_data *step_data,
 486                                 const unsigned char **inptrp,
 487                                 const unsigned char *inend,
 488                                 unsigned char **outptrp, unsigned char *outend,
 489                                 size_t *irreversible)
 490 {
 491   const unsigned char *inptr = *inptrp;
 492   unsigned char *outptr = *outptrp;
 493   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 494   int result;
 495
 496 # if __BYTE_ORDER == __BIG_ENDIAN
 497   /* Sigh, we have to do some real work.  */
 498   size_t cnt;
 499
 500   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4, outptr += 4)
 501     {
 502       outptr[0] = inptr[3];
 503       outptr[1] = inptr[2];
 504       outptr[2] = inptr[1];
 505       outptr[3] = inptr[0];
 506     }
 507
 508   *inptrp = inptr;
 509   *outptrp = outptr;
 510 # elif __BYTE_ORDER == __LITTLE_ENDIAN
 511   /* Simply copy the data.  */
 512   *inptrp = inptr + n_convert * 4;
 513   *outptrp = __mempcpy (outptr, inptr, n_convert * 4);
 514 # else
 515 #  error "This endianess is not supported."
 516 # endif
 517
 518   /* Determine the status.  */
 519   if (*inptrp == inend)
 520     result = __GCONV_EMPTY_INPUT;
 521   else if (*inptrp + 4 > inend)
 522     result = __GCONV_INCOMPLETE_INPUT;
 523   else
 524     {
 525       assert (*outptrp + 4 > outend);
 526       result = __GCONV_FULL_OUTPUT;
 527     }
 528
 529   return result;
 530 }
 531 #endif
 532
 533
 534 static inline int
 535 __attribute ((always_inline))
 536 internal_ucs4le_loop_single (struct __gconv_step *step,
 537                              struct __gconv_step_data *step_data,
 538                              const unsigned char **inptrp,
 539                              const unsigned char *inend,
 540                              unsigned char **outptrp, unsigned char *outend,
 541                              size_t *irreversible)
 542 {
 543   mbstate_t *state = step_data->__statep;
 544   size_t cnt = state->__count & 7;
 545
 546   while (*inptrp < inend && cnt < 4)
 547     state->__value.__wchb[cnt++] = *(*inptrp)++;
 548
 549   if (__builtin_expect (cnt < 4, 0))
 550     {
 551       /* Still not enough bytes.  Store the ones in the input buffer.  */
 552       state->__count &= ~7;
 553       state->__count |= cnt;
 554
 555       return __GCONV_INCOMPLETE_INPUT;
 556     }
 557
 558 #if __BYTE_ORDER == __BIG_ENDIAN
 559   (*outptrp)[0] = state->__value.__wchb[3];
 560   (*outptrp)[1] = state->__value.__wchb[2];
 561   (*outptrp)[2] = state->__value.__wchb[1];
 562   (*outptrp)[3] = state->__value.__wchb[0];
 563
 564 #else
 565   /* XXX unaligned */
 566   (*outptrp)[0] = state->__value.__wchb[0];
 567   (*outptrp)[1] = state->__value.__wchb[1];
 568   (*outptrp)[2] = state->__value.__wchb[2];
 569   (*outptrp)[3] = state->__value.__wchb[3];
 570
 571 #endif
 572
 573   *outptrp += 4;
 574
 575   /* Clear the state buffer.  */
 576   state->__count &= ~7;
 577
 578   return __GCONV_OK;
 579 }
 580
 581 #include <iconv/skeleton.c>
 582
 583
 584 /* And finally from UCS4-LE to the internal encoding.  */
 585 #define DEFINE_INIT             0
 586 #define DEFINE_FINI             0
 587 #define MIN_NEEDED_FROM         4
 588 #define MIN_NEEDED_TO           4
 589 #define FROM_DIRECTION          1
 590 #define FROM_LOOP               ucs4le_internal_loop
 591 #define TO_LOOP                 ucs4le_internal_loop /* This is not used.  */
 592 #define FUNCTION_NAME           __gconv_transform_ucs4le_internal
 593
 594
 595 static inline int
 596 __attribute ((always_inline))
 597 ucs4le_internal_loop (struct __gconv_step *step,
 598                       struct __gconv_step_data *step_data,
 599                       const unsigned char **inptrp, const unsigned char *inend,
 600                       unsigned char **outptrp, unsigned char *outend,
 601                       size_t *irreversible)
 602 {
 603   int flags = step_data->__flags;
 604   const unsigned char *inptr = *inptrp;
 605   unsigned char *outptr = *outptrp;
 606   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 607   int result;
 608   size_t cnt;
 609
 610   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
 611     {
 612       uint32_t inval;
 613
 614 #if __BYTE_ORDER == __BIG_ENDIAN
 615       inval = bswap_32 (*(const uint32_t *) inptr);
 616 #else
 617       inval = *(const uint32_t *) inptr;
 618 #endif
 619
 620       if (__builtin_expect (inval > 0x7fffffff, 0))
 621         {
 622           /* The value is too large.  We don't try transliteration here since
 623              this is not an error because of the lack of possibilities to
 624              represent the result.  This is a genuine bug in the input since
 625              UCS4 does not allow such values.  */
 626           if (irreversible == NULL)
 627             /* We are transliterating, don't try to correct anything.  */
 628             return __GCONV_ILLEGAL_INPUT;
 629
 630           if (flags & __GCONV_IGNORE_ERRORS)
 631             {
 632               /* Just ignore this character.  */
 633               ++*irreversible;
 634               continue;
 635             }
 636
 637           return __GCONV_ILLEGAL_INPUT;
 638         }
 639
 640       *((uint32_t *) outptr) = inval;
 641       outptr += sizeof (uint32_t);
 642     }
 643
 644   *inptrp = inptr;
 645   *outptrp = outptr;
 646
 647   /* Determine the status.  */
 648   if (*inptrp == inend)
 649     result = __GCONV_EMPTY_INPUT;
 650   else if (*inptrp + 4 > inend)
 651     result = __GCONV_INCOMPLETE_INPUT;
 652   else
 653     {
 654       assert (*outptrp + 4 > outend);
 655       result = __GCONV_FULL_OUTPUT;
 656     }
 657
 658   return result;
 659 }
 660
 661 #ifndef _STRING_ARCH_unaligned
 662 static inline int
 663 __attribute ((always_inline))
 664 ucs4le_internal_loop_unaligned (struct __gconv_step *step,
 665                                 struct __gconv_step_data *step_data,
 666                                 const unsigned char **inptrp,
 667                                 const unsigned char *inend,
 668                                 unsigned char **outptrp, unsigned char *outend,
 669                                 size_t *irreversible)
 670 {
 671   int flags = step_data->__flags;
 672   const unsigned char *inptr = *inptrp;
 673   unsigned char *outptr = *outptrp;
 674   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
 675   int result;
 676   size_t cnt;
 677
 678   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
 679     {
 680       if (__builtin_expect (inptr[3] > 0x80, 0))
 681         {
 682           /* The value is too large.  We don't try transliteration here since
 683              this is not an error because of the lack of possibilities to
 684              represent the result.  This is a genuine bug in the input since
 685              UCS4 does not allow such values.  */
 686           if (irreversible == NULL)
 687             /* We are transliterating, don't try to correct anything.  */
 688             return __GCONV_ILLEGAL_INPUT;
 689
 690           if (flags & __GCONV_IGNORE_ERRORS)
 691             {
 692               /* Just ignore this character.  */
 693               ++*irreversible;
 694               continue;
 695             }
 696
 697           *inptrp = inptr;
 698           *outptrp = outptr;
 699           return __GCONV_ILLEGAL_INPUT;
 700         }
 701
 702 # if __BYTE_ORDER == __BIG_ENDIAN
 703       outptr[3] = inptr[0];
 704       outptr[2] = inptr[1];
 705       outptr[1] = inptr[2];
 706       outptr[0] = inptr[3];
 707 # else
 708       outptr[0] = inptr[0];
 709       outptr[1] = inptr[1];
 710       outptr[2] = inptr[2];
 711       outptr[3] = inptr[3];
 712 # endif
 713
 714       outptr += 4;
 715     }
 716
 717   *inptrp = inptr;
 718   *outptrp = outptr;
 719
 720   /* Determine the status.  */
 721   if (*inptrp == inend)
 722     result = __GCONV_EMPTY_INPUT;
 723   else if (*inptrp + 4 > inend)
 724     result = __GCONV_INCOMPLETE_INPUT;
 725   else
 726     {
 727       assert (*outptrp + 4 > outend);
 728       result = __GCONV_FULL_OUTPUT;
 729     }
 730
 731   return result;
 732 }
 733 #endif
 734
 735
 736 static inline int
 737 __attribute ((always_inline))
 738 ucs4le_internal_loop_single (struct __gconv_step *step,
 739                              struct __gconv_step_data *step_data,
 740                              const unsigned char **inptrp,
 741                              const unsigned char *inend,
 742                              unsigned char **outptrp, unsigned char *outend,
 743                              size_t *irreversible)
 744 {
 745   mbstate_t *state = step_data->__statep;
 746   int flags = step_data->__flags;
 747   size_t cnt = state->__count & 7;
 748
 749   while (*inptrp < inend && cnt < 4)
 750     state->__value.__wchb[cnt++] = *(*inptrp)++;
 751
 752   if (__builtin_expect (cnt < 4, 0))
 753     {
 754       /* Still not enough bytes.  Store the ones in the input buffer.  */
 755       state->__count &= ~7;
 756       state->__count |= cnt;
 757
 758       return __GCONV_INCOMPLETE_INPUT;
 759     }
 760
 761   if (__builtin_expect (((unsigned char *) state->__value.__wchb)[3] > 0x80,
 762                         0))
 763     {
 764       /* The value is too large.  We don't try transliteration here since
 765          this is not an error because of the lack of possibilities to
 766          represent the result.  This is a genuine bug in the input since
 767          UCS4 does not allow such values.  */
 768       if (!(flags & __GCONV_IGNORE_ERRORS))
 769         return __GCONV_ILLEGAL_INPUT;
 770     }
 771   else
 772     {
 773 #if __BYTE_ORDER == __BIG_ENDIAN
 774       (*outptrp)[0] = state->__value.__wchb[3];
 775       (*outptrp)[1] = state->__value.__wchb[2];
 776       (*outptrp)[2] = state->__value.__wchb[1];
 777       (*outptrp)[3] = state->__value.__wchb[0];
 778 #else
 779       (*outptrp)[0] = state->__value.__wchb[0];
 780       (*outptrp)[1] = state->__value.__wchb[1];
 781       (*outptrp)[2] = state->__value.__wchb[2];
 782       (*outptrp)[3] = state->__value.__wchb[3];
 783 #endif
 784
 785       *outptrp += 4;
 786     }
 787
 788   /* Clear the state buffer.  */
 789   state->__count &= ~7;
 790
 791   return __GCONV_OK;
 792 }
 793
 794 #include <iconv/skeleton.c>
 795
 796
 797 /* Convert from ISO 646-IRV to the internal (UCS4-like) format.  */
 798 #define DEFINE_INIT             0
 799 #define DEFINE_FINI             0
 800 #define MIN_NEEDED_FROM         1
 801 #define MIN_NEEDED_TO           4
 802 #define FROM_DIRECTION          1
 803 #define FROM_LOOP               ascii_internal_loop
 804 #define TO_LOOP                 ascii_internal_loop /* This is not used.  */
 805 #define FUNCTION_NAME           __gconv_transform_ascii_internal
 806 #define ONE_DIRECTION           1
 807
 808 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 809 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 810 #define LOOPFCT                 FROM_LOOP
 811 #define BODY \
 812   {                                                                           \
 813     if (__builtin_expect (*inptr > '\x7f', 0))                                \
 814       {                                                                       \
 815         /* The value is too large.  We don't try transliteration here since   \
 816            this is not an error because of the lack of possibilities to       \
 817            represent the result.  This is a genuine bug in the input since    \
 818            ASCII does not allow such values.  */                              \
 819         STANDARD_FROM_LOOP_ERR_HANDLER (1);                                   \
 820       }                                                                       \
 821     else                                                                      \
 822       {                                                                       \
 823         /* It's an one byte sequence.  */                                     \
 824         *((uint32_t *) outptr) = *inptr++;                                    \
 825         outptr += sizeof (uint32_t);                                          \
 826       }                                                                       \
 827   }
 828 #define LOOP_NEED_FLAGS
 829 #include <iconv/loop.c>
 830 #include <iconv/skeleton.c>
 831
 832
 833 /* Convert from the internal (UCS4-like) format to ISO 646-IRV.  */
 834 #define DEFINE_INIT             0
 835 #define DEFINE_FINI             0
 836 #define MIN_NEEDED_FROM         4
 837 #define MIN_NEEDED_TO           1
 838 #define FROM_DIRECTION          1
 839 #define FROM_LOOP               internal_ascii_loop
 840 #define TO_LOOP                 internal_ascii_loop /* This is not used.  */
 841 #define FUNCTION_NAME           __gconv_transform_internal_ascii
 842 #define ONE_DIRECTION           1
 843
 844 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 845 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 846 #define LOOPFCT                 FROM_LOOP
 847 #define BODY \
 848   {                                                                           \
 849     if (__builtin_expect (*((const uint32_t *) inptr) > 0x7f, 0))             \
 850       {                                                                       \
 851         UNICODE_TAG_HANDLER (*((const uint32_t *) inptr), 4);                 \
 852         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 853       }                                                                       \
 854     else                                                                      \
 855       {                                                                       \
 856         /* It's an one byte sequence.  */                                     \
 857         *outptr++ = *((const uint32_t *) inptr);                              \
 858         inptr += sizeof (uint32_t);                                           \
 859       }                                                                       \
 860   }
 861 #define LOOP_NEED_FLAGS
 862 #include <iconv/loop.c>
 863 #include <iconv/skeleton.c>
 864
 865
 866 /* Convert from the internal (UCS4-like) format to UTF-8.  */
 867 #define DEFINE_INIT             0
 868 #define DEFINE_FINI             0
 869 #define MIN_NEEDED_FROM         4
 870 #define MIN_NEEDED_TO           1
 871 #define MAX_NEEDED_TO           6
 872 #define FROM_DIRECTION          1
 873 #define FROM_LOOP               internal_utf8_loop
 874 #define TO_LOOP                 internal_utf8_loop /* This is not used.  */
 875 #define FUNCTION_NAME           __gconv_transform_internal_utf8
 876 #define ONE_DIRECTION           1
 877
 878 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 879 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 880 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
 881 #define LOOPFCT                 FROM_LOOP
 882 #define BODY \
 883   {                                                                           \
 884     uint32_t wc = *((const uint32_t *) inptr);                                \
 885                                                                               \
 886     if (__builtin_expect (wc < 0x80, 1))                                      \
 887       /* It's an one byte sequence.  */                                       \
 888       *outptr++ = (unsigned char) wc;                                         \
 889     else if (__builtin_expect (wc <= 0x7fffffff, 1))                          \
 890       {                                                                       \
 891         size_t step;                                                          \
 892         unsigned char *start;                                                 \
 893                                                                               \
 894         for (step = 2; step < 6; ++step)                                      \
 895           if ((wc & (~(uint32_t)0 << (5 * step + 1))) == 0)                   \
 896             break;                                                            \
 897                                                                               \
 898         if (__builtin_expect (outptr + step > outend, 0))                     \
 899           {                                                                   \
 900             /* Too long.  */                                                  \
 901             result = __GCONV_FULL_OUTPUT;                                     \
 902             break;                                                            \
 903           }                                                                   \
 904                                                                               \
 905         start = outptr;                                                       \
 906         *outptr = (unsigned char) (~0xff >> step);                            \
 907         outptr += step;                                                       \
 908         do                                                                    \
 909           {                                                                   \
 910             start[--step] = 0x80 | (wc & 0x3f);                               \
 911             wc >>= 6;                                                         \
 912           }                                                                   \
 913         while (step > 1);                                                     \
 914         start[0] |= wc;                                                       \
 915       }                                                                       \
 916     else                                                                      \
 917       {                                                                       \
 918         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 919       }                                                                       \
 920                                                                               \
 921     inptr += 4;                                                               \
 922   }
 923 #define LOOP_NEED_FLAGS
 924 #include <iconv/loop.c>
 925 #include <iconv/skeleton.c>
 926
 927
 928 /* Convert from UTF-8 to the internal (UCS4-like) format.  */
 929 #define DEFINE_INIT             0
 930 #define DEFINE_FINI             0
 931 #define MIN_NEEDED_FROM         1
 932 #define MAX_NEEDED_FROM         6
 933 #define MIN_NEEDED_TO           4
 934 #define FROM_DIRECTION          1
 935 #define FROM_LOOP               utf8_internal_loop
 936 #define TO_LOOP                 utf8_internal_loop /* This is not used.  */
 937 #define FUNCTION_NAME           __gconv_transform_utf8_internal
 938 #define ONE_DIRECTION           1
 939
 940 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 941 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
 942 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 943 #define LOOPFCT                 FROM_LOOP
 944 #define BODY \
 945   {                                                                           \
 946     /* Next input byte.  */                                                   \
 947     uint32_t ch = *inptr;                                                     \
 948                                                                               \
 949     if (__builtin_expect (ch < 0x80, 1))                                      \
 950       {                                                                       \
 951         /* One byte sequence.  */                                             \
 952         ++inptr;                                                              \
 953       }                                                                       \
 954     else                                                                      \
 955       {                                                                       \
 956         uint_fast32_t cnt;                                                    \
 957         uint_fast32_t i;                                                      \
 958                                                                               \
 959         if (ch >= 0xc2 && ch < 0xe0)                                          \
 960           {                                                                   \
 961             /* We expect two bytes.  The first byte cannot be 0xc0 or 0xc1,   \
 962                otherwise the wide character could have been represented       \
 963                using a single byte.  */                                       \
 964             cnt = 2;                                                          \
 965             ch &= 0x1f;                                                       \
 966           }                                                                   \
 967         else if (__builtin_expect ((ch & 0xf0) == 0xe0, 1))                   \
 968           {                                                                   \
 969             /* We expect three bytes.  */                                     \
 970             cnt = 3;                                                          \
 971             ch &= 0x0f;                                                       \
 972           }                                                                   \
 973         else if (__builtin_expect ((ch & 0xf8) == 0xf0, 1))                   \
 974           {                                                                   \
 975             /* We expect four bytes.  */                                      \
 976             cnt = 4;                                                          \
 977             ch &= 0x07;                                                       \
 978           }                                                                   \
 979         else if (__builtin_expect ((ch & 0xfc) == 0xf8, 1))                   \
 980           {                                                                   \
 981             /* We expect five bytes.  */                                      \
 982             cnt = 5;                                                          \
 983             ch &= 0x03;                                                       \
 984           }                                                                   \
 985         else if (__builtin_expect ((ch & 0xfe) == 0xfc, 1))                   \
 986           {                                                                   \
 987             /* We expect six bytes.  */                                       \
 988             cnt = 6;                                                          \
 989             ch &= 0x01;                                                       \
 990           }                                                                   \
 991         else                                                                  \
 992           {                                                                   \
 993             /* Search the end of this ill-formed UTF-8 character.  This       \
 994                is the next byte with (x & 0xc0) != 0x80.  */                  \
 995             i = 0;                                                            \
 996             do                                                                \
 997               ++i;                                                            \
 998             while (inptr + i < inend                                          \
 999                    && (*(inptr + i) & 0xc0) == 0x80                           \
1000                    && i < 5);                                                 \
1001                                                                               \
1002           errout:                                                             \
1003             STANDARD_FROM_LOOP_ERR_HANDLER (i);                               \
1004           }                                                                   \
1005                                                                               \
1006         if (__builtin_expect (inptr + cnt > inend, 0))                        \
1007           {                                                                   \
1008             /* We don't have enough input.  But before we report that check   \
1009                that all the bytes are correct.  */                            \
1010             for (i = 1; inptr + i < inend; ++i)                               \
1011               if ((inptr[i] & 0xc0) != 0x80)                                  \
1012                 break;                                                        \
1013                                                                               \
1014             if (__builtin_expect (inptr + i == inend, 1))                     \
1015               {                                                               \
1016                 result = __GCONV_INCOMPLETE_INPUT;                            \
1017                 break;                                                        \
1018               }                                                               \
1019                                                                               \
1020             goto errout;                                                      \
1021           }                                                                   \
1022                                                                               \
1023         /* Read the possible remaining bytes.  */                             \
1024         for (i = 1; i < cnt; ++i)                                             \
1025           {                                                                   \
1026             uint32_t byte = inptr[i];                                         \
1027                                                                               \
1028             if ((byte & 0xc0) != 0x80)                                        \
1029               /* This is an illegal encoding.  */                             \
1030               break;                                                          \
1031                                                                               \
1032             ch <<= 6;                                                         \
1033             ch |= byte & 0x3f;                                                \
1034           }                                                                   \
1035                                                                               \
1036         /* If i < cnt, some trail byte was not >= 0x80, < 0xc0.               \
1037            If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could       \
1038            have been represented with fewer than cnt bytes.  */               \
1039         if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)                \
1040             /* Do not accept UTF-16 surrogates.  */                           \
1041             || (ch >= 0xd800 && ch <= 0xdfff))                                \
1042           {                                                                   \
1043             /* This is an illegal encoding.  */                               \
1044             goto errout;                                                      \
1045           }                                                                   \
1046                                                                               \
1047         inptr += cnt;                                                         \
1048       }                                                                       \
1049                                                                               \
1050     /* Now adjust the pointers and store the result.  */                      \
1051     *((uint32_t *) outptr) = ch;                                              \
1052     outptr += sizeof (uint32_t);                                              \
1053   }
1054 #define LOOP_NEED_FLAGS
1055
1056 #define STORE_REST \
1057   {                                                                           \
1058     /* We store the remaining bytes while converting them into the UCS4       \
1059        format.  We can assume that the first byte in the buffer is            \
1060        correct and that it requires a larger number of bytes than there       \
1061        are in the input buffer.  */                                           \
1062     wint_t ch = **inptrp;                                                     \
1063     size_t cnt, r;                                                            \
1064                                                                               \
1065     state->__count = inend - *inptrp;                                         \
1066                                                                               \
1067     assert (ch != 0xc0 && ch != 0xc1);                                        \
1068     if (ch >= 0xc2 && ch < 0xe0)                                              \
1069       {                                                                       \
1070         /* We expect two bytes.  The first byte cannot be 0xc0 or             \
1071            0xc1, otherwise the wide character could have been                 \
1072            represented using a single byte.  */                               \
1073         cnt = 2;                                                              \
1074         ch &= 0x1f;                                                           \
1075       }                                                                       \
1076     else if (__builtin_expect ((ch & 0xf0) == 0xe0, 1))                       \
1077       {                                                                       \
1078         /* We expect three bytes.  */                                         \
1079         cnt = 3;                                                              \
1080         ch &= 0x0f;                                                           \
1081       }                                                                       \
1082     else if (__builtin_expect ((ch & 0xf8) == 0xf0, 1))                       \
1083       {                                                                       \
1084         /* We expect four bytes.  */                                          \
1085         cnt = 4;                                                              \
1086         ch &= 0x07;                                                           \
1087       }                                                                       \
1088     else if (__builtin_expect ((ch & 0xfc) == 0xf8, 1))                       \
1089       {                                                                       \
1090         /* We expect five bytes.  */                                          \
1091         cnt = 5;                                                              \
1092         ch &= 0x03;                                                           \
1093       }                                                                       \
1094     else                                                                      \
1095       {                                                                       \
1096         /* We expect six bytes.  */                                           \
1097         cnt = 6;                                                              \
1098         ch &= 0x01;                                                           \
1099       }                                                                       \
1100                                                                               \
1101     /* The first byte is already consumed.  */                                \
1102     r = cnt - 1;                                                              \
1103     while (++(*inptrp) < inend)                                               \
1104       {                                                                       \
1105         ch <<= 6;                                                             \
1106         ch |= **inptrp & 0x3f;                                                \
1107         --r;                                                                  \
1108       }                                                                       \
1109                                                                               \
1110     /* Shift for the so far missing bytes.  */                                \
1111     ch <<= r * 6;                                                             \
1112                                                                               \
1113     /* Store the number of bytes expected for the entire sequence.  */        \
1114     state->__count |= cnt << 8;                                               \
1115                                                                               \
1116     /* Store the value.  */                                                   \
1117     state->__value.__wch = ch;                                                \
1118   }
1119
1120 #define UNPACK_BYTES \
1121   {                                                                           \
1122     static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc };  \
1123     wint_t wch = state->__value.__wch;                                        \
1124     size_t ntotal = state->__count >> 8;                                      \
1125                                                                               \
1126     inlen = state->__count & 255;                                             \
1127                                                                               \
1128     bytebuf[0] = inmask[ntotal - 2];                                          \
1129                                                                               \
1130     do                                                                        \
1131       {                                                                       \
1132         if (--ntotal < inlen)                                                 \
1133           bytebuf[ntotal] = 0x80 | (wch & 0x3f);                              \
1134         wch >>= 6;                                                            \
1135       }                                                                       \
1136     while (ntotal > 1);                                                       \
1137                                                                               \
1138     bytebuf[0] |= wch;                                                        \
1139   }
1140
1141 #define CLEAR_STATE \
1142   state->__count = 0
1143
1144
1145 #include <iconv/loop.c>
1146 #include <iconv/skeleton.c>
1147
1148
1149 /* Convert from UCS2 to the internal (UCS4-like) format.  */
1150 #define DEFINE_INIT             0
1151 #define DEFINE_FINI             0
1152 #define MIN_NEEDED_FROM         2
1153 #define MIN_NEEDED_TO           4
1154 #define FROM_DIRECTION          1
1155 #define FROM_LOOP               ucs2_internal_loop
1156 #define TO_LOOP                 ucs2_internal_loop /* This is not used.  */
1157 #define FUNCTION_NAME           __gconv_transform_ucs2_internal
1158 #define ONE_DIRECTION           1
1159
1160 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
1161 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
1162 #define LOOPFCT                 FROM_LOOP
1163 #define BODY \
1164   {                                                                           \
1165     uint16_t u1 = get16 (inptr);                                              \
1166                                                                               \
1167     if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0))                    \
1168       {                                                                       \
1169         /* Surrogate characters in UCS-2 input are not valid.  Reject         \
1170            them.  (Catching this here is not security relevant.)  */          \
1171         STANDARD_FROM_LOOP_ERR_HANDLER (2);                                   \
1172       }                                                                       \
1173                                                                               \
1174     *((uint32_t *) outptr) = u1;                                              \
1175     outptr += sizeof (uint32_t);                                              \
1176     inptr += 2;                                                               \
1177   }
1178 #define LOOP_NEED_FLAGS
1179 #include <iconv/loop.c>
1180 #include <iconv/skeleton.c>
1181
1182
1183 /* Convert from the internal (UCS4-like) format to UCS2.  */
1184 #define DEFINE_INIT             0
1185 #define DEFINE_FINI             0
1186 #define MIN_NEEDED_FROM         4
1187 #define MIN_NEEDED_TO           2
1188 #define FROM_DIRECTION          1
1189 #define FROM_LOOP               internal_ucs2_loop
1190 #define TO_LOOP                 internal_ucs2_loop /* This is not used.  */
1191 #define FUNCTION_NAME           __gconv_transform_internal_ucs2
1192 #define ONE_DIRECTION           1
1193
1194 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
1195 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
1196 #define LOOPFCT                 FROM_LOOP
1197 #define BODY \
1198   {                                                                           \
1199     uint32_t val = *((const uint32_t *) inptr);                               \
1200                                                                               \
1201     if (__builtin_expect (val >= 0x10000, 0))                                 \
1202       {                                                                       \
1203         UNICODE_TAG_HANDLER (val, 4);                                         \
1204         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
1205       }                                                                       \
1206     else if (__builtin_expect (val >= 0xd800 && val < 0xe000, 0))             \
1207       {                                                                       \
1208         /* Surrogate characters in UCS-4 input are not valid.                 \
1209            We must catch this, because the UCS-2 output might be              \
1210            interpreted as UTF-16 by other programs.  If we let                \
1211            surrogates pass through, attackers could make a security           \
1212            hole exploit by synthesizing any desired plane 1-16                \
1213            character.  */                                                     \
1214         result = __GCONV_ILLEGAL_INPUT;                                       \
1215         if (! ignore_errors_p ())                                             \
1216           break;                                                              \
1217         inptr += 4;                                                           \
1218         ++*irreversible;                                                      \
1219         continue;                                                             \
1220       }                                                                       \
1221     else                                                                      \
1222       {                                                                       \
1223         put16 (outptr, val);                                                  \
1224         outptr += sizeof (uint16_t);                                          \
1225         inptr += 4;                                                           \
1226       }                                                                       \
1227   }
1228 #define LOOP_NEED_FLAGS
1229 #include <iconv/loop.c>
1230 #include <iconv/skeleton.c>
1231
1232
1233 /* Convert from UCS2 in other endianness to the internal (UCS4-like) format. */
1234 #define DEFINE_INIT             0
1235 #define DEFINE_FINI             0
1236 #define MIN_NEEDED_FROM         2
1237 #define MIN_NEEDED_TO           4
1238 #define FROM_DIRECTION          1
1239 #define FROM_LOOP               ucs2reverse_internal_loop
1240 #define TO_LOOP                 ucs2reverse_internal_loop/* This is not used.*/
1241 #define FUNCTION_NAME           __gconv_transform_ucs2reverse_internal
1242 #define ONE_DIRECTION           1
1243
1244 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
1245 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
1246 #define LOOPFCT                 FROM_LOOP
1247 #define BODY \
1248   {                                                                           \
1249     uint16_t u1 = bswap_16 (get16 (inptr));                                   \
1250                                                                               \
1251     if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0))                    \
1252       {                                                                       \
1253         /* Surrogate characters in UCS-2 input are not valid.  Reject         \
1254            them.  (Catching this here is not security relevant.)  */          \
1255         if (! ignore_errors_p ())                                             \
1256           {                                                                   \
1257             result = __GCONV_ILLEGAL_INPUT;                                   \
1258             break;                                                            \
1259           }                                                                   \
1260         inptr += 2;                                                           \
1261         ++*irreversible;                                                      \
1262         continue;                                                             \
1263       }                                                                       \
1264                                                                               \
1265     *((uint32_t *) outptr) = u1;                                              \
1266     outptr += sizeof (uint32_t);                                              \
1267     inptr += 2;                                                               \
1268   }
1269 #define LOOP_NEED_FLAGS
1270 #include <iconv/loop.c>
1271 #include <iconv/skeleton.c>
1272
1273
1274 /* Convert from the internal (UCS4-like) format to UCS2 in other endianness. */
1275 #define DEFINE_INIT             0
1276 #define DEFINE_FINI             0
1277 #define MIN_NEEDED_FROM         4
1278 #define MIN_NEEDED_TO           2
1279 #define FROM_DIRECTION          1
1280 #define FROM_LOOP               internal_ucs2reverse_loop
1281 #define TO_LOOP                 internal_ucs2reverse_loop/* This is not used.*/
1282 #define FUNCTION_NAME           __gconv_transform_internal_ucs2reverse
1283 #define ONE_DIRECTION           1
1284
1285 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
1286 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
1287 #define LOOPFCT                 FROM_LOOP
1288 #define BODY \
1289   {                                                                           \
1290     uint32_t val = *((const uint32_t *) inptr);                               \
1291     if (__builtin_expect (val >= 0x10000, 0))                                 \
1292       {                                                                       \
1293         UNICODE_TAG_HANDLER (val, 4);                                         \
1294         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
1295       }                                                                       \
1296     else if (__builtin_expect (val >= 0xd800 && val < 0xe000, 0))             \
1297       {                                                                       \
1298         /* Surrogate characters in UCS-4 input are not valid.                 \
1299            We must catch this, because the UCS-2 output might be              \
1300            interpreted as UTF-16 by other programs.  If we let                \
1301            surrogates pass through, attackers could make a security           \
1302            hole exploit by synthesizing any desired plane 1-16                \
1303            character.  */                                                     \
1304         if (! ignore_errors_p ())                                             \
1305           {                                                                   \
1306             result = __GCONV_ILLEGAL_INPUT;                                   \
1307             break;                                                            \
1308           }                                                                   \
1309         inptr += 4;                                                           \
1310         ++*irreversible;                                                      \
1311         continue;                                                             \
1312       }                                                                       \
1313     else                                                                      \
1314       {                                                                       \
1315         put16 (outptr, bswap_16 (val));                                       \
1316         outptr += sizeof (uint16_t);                                          \
1317         inptr += 4;                                                           \
1318       }                                                                       \
1319   }
1320 #define LOOP_NEED_FLAGS
1321 #include <iconv/loop.c>
1322 #include <iconv/skeleton.c>