iconvdata/ibm1364.c

   1 /* Conversion from and to IBM1364.
   2    Copyright (C) 2005-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <stdint.h>
  21 #include <wchar.h>
  22 #include <byteswap.h>
  23
  24 #ifndef CHARSET_NAME
  25 /* This is really the IBM1364 converter, not another module sharing
  26    the code.  */
  27 # define DATA_HEADER    "ibm1364.h"
  28 # define CHARSET_NAME   "IBM1364//"
  29 # define FROM_LOOP      from_ibm1364
  30 # define TO_LOOP        to_ibm1364
  31 # define SB_TO_UCS4     __ibm1364sb_to_ucs4
  32 # define DB_TO_UCS4_IDX __ibm1364db_to_ucs4_idx
  33 # define DB_TO_UCS4     __ibm1364db_to_ucs4
  34 # define UCS4_TO_SB_IDX __ucs4_to_ibm1364sb_idx
  35 # define UCS4_TO_SB     __ucs4_to_ibm1364sb
  36 # define UCS4_TO_DB_IDX __ucs4_to_ibm1364db_idx
  37 # define UCS4_TO_DB     __ucs4_to_ibm1364db
  38 # define UCS_LIMIT      0xffff
  39 #endif
  40
  41
  42 #include DATA_HEADER
  43
  44 /* The shift sequences for this charset (it does not use ESC).  */
  45 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  46 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  47
  48 /* Definitions used in the body of the `gconv' function.  */
  49 #define MIN_NEEDED_FROM 1
  50 #define MAX_NEEDED_FROM 2
  51 #define MIN_NEEDED_TO   4
  52 #ifdef HAS_COMBINED
  53 # define MAX_NEEDED_TO  8
  54 #else
  55 # define MAX_NEEDED_TO  4
  56 #endif
  57 #define ONE_DIRECTION   0
  58 #define PREPARE_LOOP \
  59   int save_curcs;                                                             \
  60   int *curcsp = &data->__statep->__count;
  61 #define EXTRA_LOOP_ARGS         , curcsp
  62
  63 /* Definitions of initialization and destructor function.  */
  64 #define DEFINE_INIT     1
  65 #define DEFINE_FINI     1
  66
  67
  68 /* Since this is a stateful encoding we have to provide code which resets
  69    the output state to the initial state.  This has to be done during the
  70    flushing.  */
  71 #define EMIT_SHIFT_TO_INIT \
  72   if ((data->__statep->__count & ~7) != sb)                                   \
  73     {                                                                         \
  74       if (FROM_DIRECTION)                                                     \
  75         data->__statep->__count &= 7;                                         \
  76       else                                                                    \
  77         {                                                                     \
  78           /* We are not in the initial state.  To switch back we have         \
  79              to emit `SI'.  */                                                \
  80           if (__glibc_unlikely (outbuf >= outend))                            \
  81             /* We don't have enough room in the output buffer.  */            \
  82             status = __GCONV_FULL_OUTPUT;                                     \
  83           else                                                                \
  84             {                                                                 \
  85               /* Write out the shift sequence.  */                            \
  86               *outbuf++ = SI;                                                 \
  87               data->__statep->__count &= 7;                                   \
  88             }                                                                 \
  89         }                                                                     \
  90     }
  91
  92
  93 /* Since we might have to reset input pointer we must be able to save
  94    and retore the state.  */
  95 #define SAVE_RESET_STATE(Save) \
  96   if (Save)                                                                   \
  97     save_curcs = *curcsp;                                                     \
  98   else                                                                        \
  99     *curcsp = save_curcs
 100
 101
 102 /* Current codeset type.  */
 103 enum
 104 {
 105   sb = 0,
 106   db = 64
 107 };
 108
 109
 110 /* Subroutine to write out converted UCS4 from IBM-13XX.  */
 111 #ifdef HAS_COMBINED
 112 # define SUB_COMBINED_UCS_FROM_IBM13XX \
 113   {                                                                           \
 114     if (res != UCS_LIMIT || ch < __TO_UCS4_COMBINED_MIN                       \
 115         || ch > __TO_UCS4_COMBINED_MAX)                                       \
 116       {                                                                       \
 117         put32 (outptr, res);                                                  \
 118         outptr += 4;                                                          \
 119       }                                                                       \
 120     else                                                                      \
 121       {                                                                       \
 122         /* This is a combined character.  Make sure we have room.  */         \
 123         if (__glibc_unlikely (outptr + 8 > outend))                           \
 124           {                                                                   \
 125             result = __GCONV_FULL_OUTPUT;                                     \
 126             break;                                                            \
 127           }                                                                   \
 128                                                                               \
 129         const struct divide *cmbp                                             \
 130           = &DB_TO_UCS4_COMB[ch - __TO_UCS4_COMBINED_MIN];                    \
 131         assert (cmbp->res1 != 0 && cmbp->res2 != 0);                          \
 132                                                                               \
 133         put32 (outptr, cmbp->res1);                                           \
 134         outptr += 4;                                                          \
 135         put32 (outptr, cmbp->res2);                                           \
 136         outptr += 4;                                                          \
 137       }                                                                       \
 138   }
 139 #else
 140 # define SUB_COMBINED_UCS_FROM_IBM13XX \
 141   {                                                                           \
 142     put32 (outptr, res);                                                      \
 143     outptr += 4;                                                              \
 144   }
 145 #endif /* HAS_COMBINED */
 146
 147
 148 /* First, define the conversion function from IBM-13XX to UCS4.  */
 149 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 150 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
 151 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 152 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
 153 #define LOOPFCT                 FROM_LOOP
 154 #define BODY \
 155   {                                                                           \
 156     uint32_t ch = *inptr;                                                     \
 157                                                                               \
 158     if (__builtin_expect (ch, 0) == SO)                                       \
 159       {                                                                       \
 160         /* Shift OUT, change to DBCS converter (redundant escape okay).  */   \
 161         curcs = db;                                                           \
 162         ++inptr;                                                              \
 163         continue;                                                             \
 164       }                                                                       \
 165     if (__builtin_expect (ch, 0) == SI)                                       \
 166       {                                                                       \
 167         /* Shift IN, change to SBCS converter (redundant escape okay).  */    \
 168         curcs = sb;                                                           \
 169         ++inptr;                                                              \
 170         continue;                                                             \
 171       }                                                                       \
 172                                                                               \
 173     if (curcs == sb)                                                          \
 174       {                                                                       \
 175         /* Use the IBM13XX table for single byte.  */                         \
 176         uint32_t res = SB_TO_UCS4[ch];                                \
 177         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 178           {                                                                   \
 179             /* This is an illegal character.  */                              \
 180             if (! ignore_errors_p ())                                         \
 181               {                                                               \
 182                 result = __GCONV_ILLEGAL_INPUT;                               \
 183                 break;                                                        \
 184               }                                                               \
 185             ++*irreversible;                                                  \
 186           }                                                                   \
 187         else                                                                  \
 188           {                                                                   \
 189             put32 (outptr, res);                                              \
 190             outptr += 4;                                                      \
 191           }                                                                   \
 192         ++inptr;                                                              \
 193       }                                                                       \
 194     else                                                                      \
 195       {                                                                       \
 196         assert (curcs == db);                                                 \
 197                                                                               \
 198         if (__glibc_unlikely (inptr + 1 >= inend))                            \
 199           {                                                                   \
 200             /* The second character is not available.  Store the              \
 201                intermediate result.  */                                       \
 202             result = __GCONV_INCOMPLETE_INPUT;                                \
 203             break;                                                            \
 204           }                                                                   \
 205                                                                               \
 206         ch = (ch * 0x100) + inptr[1];                                         \
 207                                                                               \
 208         /* Use the IBM1364 table for double byte.  */                         \
 209         const struct gap *rp2 = DB_TO_UCS4_IDX;                               \
 210         while (ch > rp2->end)                                                 \
 211           ++rp2;                                                              \
 212                                                                               \
 213         uint32_t res;                                                         \
 214         if (__builtin_expect (rp2->start == 0xffff, 0)                        \
 215             || __builtin_expect (ch < rp2->start, 0)                          \
 216             || (res = DB_TO_UCS4[ch + rp2->idx],                              \
 217                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 218           {                                                                   \
 219             /* This is an illegal character.  */                              \
 220             if (! ignore_errors_p ())                                         \
 221               {                                                               \
 222                 result = __GCONV_ILLEGAL_INPUT;                               \
 223                 break;                                                        \
 224               }                                                               \
 225             ++*irreversible;                                                  \
 226           }                                                                   \
 227         else                                                                  \
 228           {                                                                   \
 229             SUB_COMBINED_UCS_FROM_IBM13XX;                                    \
 230           }                                                                   \
 231         inptr += 2;                                                           \
 232       }                                                                       \
 233   }
 234 #define LOOP_NEED_FLAGS
 235 #define EXTRA_LOOP_DECLS        , int *curcsp
 236 #define INIT_PARAMS             int curcs = *curcsp & ~7
 237 #define UPDATE_PARAMS           *curcsp = curcs
 238 #include <iconv/loop.c>
 239
 240
 241 /* Subroutine to convert two UCS4 codes to IBM-13XX.  */
 242 #ifdef HAS_COMBINED
 243 # define SUB_COMBINED_UCS_TO_IBM13XX \
 244   {                                                                           \
 245     const struct combine *cmbp = UCS4_COMB_TO_DB;                             \
 246     while (cmbp->res1 < ch)                                                   \
 247       ++cmbp;                                                                 \
 248     /* XXX if last char is beginning of combining store in state */           \
 249     if (cmbp->res1 == ch && inptr + 4 < inend)                                \
 250       {                                                                       \
 251         /* See if input is part of a combined character.  */                  \
 252         uint32_t ch_next = get32 (inptr + 4);                                 \
 253         while (cmbp->res2 != ch_next)                                         \
 254           {                                                                   \
 255             ++cmbp;                                                           \
 256             if (cmbp->res1 != ch)                                             \
 257               goto not_combined;                                              \
 258           }                                                                   \
 259                                                                               \
 260         /* It is a combined character.  First make sure we are in             \
 261            double byte mode.  */                                              \
 262         if (curcs == sb)                                                      \
 263           {                                                                   \
 264             /* We know there is room for at least one byte.  */               \
 265             *outptr++ = SO;                                                   \
 266             curcs = db;                                                       \
 267           }                                                                   \
 268                                                                               \
 269         if (__glibc_unlikely (outptr + 2 > outend))                           \
 270           {                                                                   \
 271             result = __GCONV_FULL_OUTPUT;                                     \
 272             break;                                                            \
 273           }                                                                   \
 274         *outptr++ = cmbp->ch[0];                                              \
 275         *outptr++ = cmbp->ch[1];                                              \
 276         inptr += 8;                                                           \
 277         continue;                                                             \
 278                                                                               \
 279       not_combined:;                                                          \
 280       }                                                                       \
 281   }
 282 #else
 283 # define SUB_COMBINED_UCS_TO_IBM13XX
 284 #endif /* HAS_COMBINED */
 285
 286
 287 /* Next, define the other direction.  */
 288 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
 289 #define MAX_NEEDED_INPUT        MAX_NEEDED_TO
 290 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
 291 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_FROM
 292 #define LOOPFCT                 TO_LOOP
 293 #define BODY \
 294   {                                                                           \
 295     uint32_t ch = get32 (inptr);                                              \
 296                                                                               \
 297     if (__glibc_unlikely (ch >= UCS_LIMIT))                                   \
 298       {                                                                       \
 299         UNICODE_TAG_HANDLER (ch, 4);                                          \
 300                                                                               \
 301         if (! ignore_errors_p ())                                             \
 302           {                                                                   \
 303             result = __GCONV_ILLEGAL_INPUT;                                   \
 304             break;                                                            \
 305           }                                                                   \
 306         ++*irreversible;                                                      \
 307         inptr += 4;                                                           \
 308         continue;                                                             \
 309       }                                                                       \
 310                                                                               \
 311     SUB_COMBINED_UCS_TO_IBM13XX;                                              \
 312                                                                               \
 313     const struct gap *rp1 = UCS4_TO_SB_IDX;                                   \
 314     while (ch > rp1->end)                                                     \
 315       ++rp1;                                                                  \
 316                                                                               \
 317     /* Use the UCS4 table for single byte.  */                                \
 318     const char *cp;                                                           \
 319     if (__builtin_expect (ch < rp1->start, 0)                                 \
 320         || (cp = UCS4_TO_SB[ch + rp1->idx],                                   \
 321             __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))          \
 322       {                                                                       \
 323         /* Use the UCS4 table for double byte.  */                            \
 324         const struct gap *rp2 = UCS4_TO_DB_IDX;                               \
 325         while (ch > rp2->end)                                                 \
 326           ++rp2;                                                              \
 327                                                                               \
 328         if (__builtin_expect (ch < rp2->start, 0)                             \
 329             || (cp = UCS4_TO_DB[ch + rp2->idx],                               \
 330                 __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))      \
 331           {                                                                   \
 332             /* This is an illegal character.  */                              \
 333             if (! ignore_errors_p ())                                         \
 334               {                                                               \
 335                 result = __GCONV_ILLEGAL_INPUT;                               \
 336                 break;                                                        \
 337               }                                                               \
 338             ++*irreversible;                                                  \
 339           }                                                                   \
 340         else                                                                  \
 341           {                                                                   \
 342             if (curcs == sb)                                                  \
 343               {                                                               \
 344                 /* We know there is room for at least one byte.  */           \
 345                 *outptr++ = SO;                                               \
 346                 curcs = db;                                                   \
 347               }                                                               \
 348                                                                               \
 349             if (__glibc_unlikely (outptr + 2 > outend))                       \
 350               {                                                               \
 351                 result = __GCONV_FULL_OUTPUT;                                 \
 352                 break;                                                        \
 353               }                                                               \
 354             *outptr++ = cp[0];                                                \
 355             *outptr++ = cp[1];                                                \
 356           }                                                                   \
 357       }                                                                       \
 358     else                                                                      \
 359       {                                                                       \
 360         if (__glibc_unlikely (curcs == db))                                   \
 361           {                                                                   \
 362             /* We know there is room for at least one byte.  */               \
 363             *outptr++ = SI;                                                   \
 364             curcs = sb;                                                       \
 365                                                                               \
 366             if (__glibc_unlikely (outptr >= outend))                          \
 367               {                                                               \
 368                 result = __GCONV_FULL_OUTPUT;                                 \
 369                 break;                                                        \
 370               }                                                               \
 371           }                                                                   \
 372                                                                               \
 373         *outptr++ = cp[0];                                                    \
 374       }                                                                       \
 375                                                                               \
 376     /* Now that we wrote the output increment the input pointer.  */          \
 377     inptr += 4;                                                               \
 378   }
 379 #define LOOP_NEED_FLAGS
 380 #define EXTRA_LOOP_DECLS        , int *curcsp
 381 #define INIT_PARAMS             int curcs = *curcsp & ~7
 382 #define REINIT_PARAMS           curcs = *curcsp & ~7
 383 #define UPDATE_PARAMS           *curcsp = curcs
 384 #include <iconv/loop.c>
 385
 386 /* Now define the toplevel functions.  */
 387 #include <iconv/skeleton.c>