iconvdata/ibm1364.c

   1 /* Conversion from and to IBM1364.
   2    Copyright (C) 2005-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Masahide Washizawa <washi@jp.ibm.com>, 2005.
   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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <dlfcn.h>
  21 #include <stdint.h>
  22 #include <wchar.h>
  23 #include <byteswap.h>
  24
  25 #ifndef CHARSET_NAME
  26 /* This is really the IBM1364 converter, not another module sharing
  27    the code.  */
  28 # define DATA_HEADER    "ibm1364.h"
  29 # define CHARSET_NAME   "IBM1364//"
  30 # define FROM_LOOP      from_ibm1364
  31 # define TO_LOOP        to_ibm1364
  32 # define SB_TO_UCS4     __ibm1364sb_to_ucs4
  33 # define DB_TO_UCS4_IDX __ibm1364db_to_ucs4_idx
  34 # define DB_TO_UCS4     __ibm1364db_to_ucs4
  35 # define UCS4_TO_SB_IDX __ucs4_to_ibm1364sb_idx
  36 # define UCS4_TO_SB     __ucs4_to_ibm1364sb
  37 # define UCS4_TO_DB_IDX __ucs4_to_ibm1364db_idx
  38 # define UCS4_TO_DB     __ucs4_to_ibm1364db
  39 # define UCS_LIMIT      0xffff
  40 #endif
  41
  42
  43 #include DATA_HEADER
  44
  45 /* The shift sequences for this charset (it does not use ESC).  */
  46 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  47 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  48
  49 /* Definitions used in the body of the `gconv' function.  */
  50 #define MIN_NEEDED_FROM 1
  51 #define MAX_NEEDED_FROM 2
  52 #define MIN_NEEDED_TO   4
  53 #ifdef HAS_COMBINED
  54 # define MAX_NEEDED_TO  8
  55 #else
  56 # define MAX_NEEDED_TO  4
  57 #endif
  58 #define ONE_DIRECTION   0
  59 #define PREPARE_LOOP \
  60   int save_curcs;                                                             \
  61   int *curcsp = &data->__statep->__count;
  62 #define EXTRA_LOOP_ARGS         , curcsp
  63
  64 /* Definitions of initialization and destructor function.  */
  65 #define DEFINE_INIT     1
  66 #define DEFINE_FINI     1
  67
  68
  69 /* Since this is a stateful encoding we have to provide code which resets
  70    the output state to the initial state.  This has to be done during the
  71    flushing.  */
  72 #define EMIT_SHIFT_TO_INIT \
  73   if ((data->__statep->__count & ~7) != sb)                                   \
  74     {                                                                         \
  75       if (FROM_DIRECTION)                                                     \
  76         data->__statep->__count &= 7;                                         \
  77       else                                                                    \
  78         {                                                                     \
  79           /* We are not in the initial state.  To switch back we have         \
  80              to emit `SI'.  */                                                \
  81           if (__glibc_unlikely (outbuf >= outend))                            \
  82             /* We don't have enough room in the output buffer.  */            \
  83             status = __GCONV_FULL_OUTPUT;                                     \
  84           else                                                                \
  85             {                                                                 \
  86               /* Write out the shift sequence.  */                            \
  87               *outbuf++ = SI;                                                 \
  88               data->__statep->__count &= 7;                                   \
  89             }                                                                 \
  90         }                                                                     \
  91     }
  92
  93
  94 /* Since we might have to reset input pointer we must be able to save
  95    and retore the state.  */
  96 #define SAVE_RESET_STATE(Save) \
  97   if (Save)                                                                   \
  98     save_curcs = *curcsp;                                                     \
  99   else                                                                        \
 100     *curcsp = save_curcs
 101
 102
 103 /* Current codeset type.  */
 104 enum
 105 {
 106   sb = 0,
 107   db = 64
 108 };
 109
 110
 111 /* Subroutine to write out converted UCS4 from IBM-13XX.  */
 112 #ifdef HAS_COMBINED
 113 # define SUB_COMBINED_UCS_FROM_IBM13XX \
 114   {                                                                           \
 115     if (res != UCS_LIMIT || ch < __TO_UCS4_COMBINED_MIN                       \
 116         || ch > __TO_UCS4_COMBINED_MAX)                                       \
 117       {                                                                       \
 118         put32 (outptr, res);                                                  \
 119         outptr += 4;                                                          \
 120       }                                                                       \
 121     else                                                                      \
 122       {                                                                       \
 123         /* This is a combined character.  Make sure we have room.  */         \
 124         if (__glibc_unlikely (outptr + 8 > outend))                           \
 125           {                                                                   \
 126             result = __GCONV_FULL_OUTPUT;                                     \
 127             break;                                                            \
 128           }                                                                   \
 129                                                                               \
 130         const struct divide *cmbp                                             \
 131           = &DB_TO_UCS4_COMB[ch - __TO_UCS4_COMBINED_MIN];                    \
 132         assert (cmbp->res1 != 0 && cmbp->res2 != 0);                          \
 133                                                                               \
 134         put32 (outptr, cmbp->res1);                                           \
 135         outptr += 4;                                                          \
 136         put32 (outptr, cmbp->res2);                                           \
 137         outptr += 4;                                                          \
 138       }                                                                       \
 139   }
 140 #else
 141 # define SUB_COMBINED_UCS_FROM_IBM13XX \
 142   {                                                                           \
 143     put32 (outptr, res);                                                      \
 144     outptr += 4;                                                              \
 145   }
 146 #endif /* HAS_COMBINED */
 147
 148
 149 /* First, define the conversion function from IBM-13XX to UCS4.  */
 150 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 151 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
 152 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 153 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
 154 #define LOOPFCT                 FROM_LOOP
 155 #define BODY \
 156   {                                                                           \
 157     uint32_t ch = *inptr;                                                     \
 158                                                                               \
 159     if (__builtin_expect (ch, 0) == SO)                                       \
 160       {                                                                       \
 161         /* Shift OUT, change to DBCS converter (redundant escape okay).  */   \
 162         curcs = db;                                                           \
 163         ++inptr;                                                              \
 164         continue;                                                             \
 165       }                                                                       \
 166     if (__builtin_expect (ch, 0) == SI)                                       \
 167       {                                                                       \
 168         /* Shift IN, change to SBCS converter (redundant escape okay).  */    \
 169         curcs = sb;                                                           \
 170         ++inptr;                                                              \
 171         continue;                                                             \
 172       }                                                                       \
 173                                                                               \
 174     if (curcs == sb)                                                          \
 175       {                                                                       \
 176         /* Use the IBM13XX table for single byte.  */                         \
 177         uint32_t res = SB_TO_UCS4[ch];                                \
 178         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 179           {                                                                   \
 180             /* This is an illegal character.  */                              \
 181             if (! ignore_errors_p ())                                         \
 182               {                                                               \
 183                 result = __GCONV_ILLEGAL_INPUT;                               \
 184                 break;                                                        \
 185               }                                                               \
 186             ++*irreversible;                                                  \
 187           }                                                                   \
 188         else                                                                  \
 189           {                                                                   \
 190             put32 (outptr, res);                                              \
 191             outptr += 4;                                                      \
 192           }                                                                   \
 193         ++inptr;                                                              \
 194       }                                                                       \
 195     else                                                                      \
 196       {                                                                       \
 197         assert (curcs == db);                                                 \
 198                                                                               \
 199         if (__glibc_unlikely (inptr + 1 >= inend))                            \
 200           {                                                                   \
 201             /* The second character is not available.  Store the              \
 202                intermediate result.  */                                       \
 203             result = __GCONV_INCOMPLETE_INPUT;                                \
 204             break;                                                            \
 205           }                                                                   \
 206                                                                               \
 207         ch = (ch * 0x100) + inptr[1];                                         \
 208                                                                               \
 209         /* Use the IBM1364 table for double byte.  */                         \
 210         const struct gap *rp2 = DB_TO_UCS4_IDX;                               \
 211         while (ch > rp2->end)                                                 \
 212           ++rp2;                                                              \
 213                                                                               \
 214         uint32_t res;                                                         \
 215         if (__builtin_expect (rp2->start == 0xffff, 0)                        \
 216             || __builtin_expect (ch < rp2->start, 0)                          \
 217             || (res = DB_TO_UCS4[ch + rp2->idx],                              \
 218                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 219           {                                                                   \
 220             /* This is an illegal character.  */                              \
 221             if (! ignore_errors_p ())                                         \
 222               {                                                               \
 223                 result = __GCONV_ILLEGAL_INPUT;                               \
 224                 break;                                                        \
 225               }                                                               \
 226             ++*irreversible;                                                  \
 227           }                                                                   \
 228         else                                                                  \
 229           {                                                                   \
 230             SUB_COMBINED_UCS_FROM_IBM13XX;                                    \
 231           }                                                                   \
 232         inptr += 2;                                                           \
 233       }                                                                       \
 234   }
 235 #define LOOP_NEED_FLAGS
 236 #define EXTRA_LOOP_DECLS        , int *curcsp
 237 #define INIT_PARAMS             int curcs = *curcsp & ~7
 238 #define UPDATE_PARAMS           *curcsp = curcs
 239 #include <iconv/loop.c>
 240
 241
 242 /* Subroutine to convert two UCS4 codes to IBM-13XX.  */
 243 #ifdef HAS_COMBINED
 244 # define SUB_COMBINED_UCS_TO_IBM13XX \
 245   {                                                                           \
 246     const struct combine *cmbp = UCS4_COMB_TO_DB;                             \
 247     while (cmbp->res1 < ch)                                                   \
 248       ++cmbp;                                                                 \
 249     /* XXX if last char is beginning of combining store in state */           \
 250     if (cmbp->res1 == ch && inptr + 4 < inend)                                \
 251       {                                                                       \
 252         /* See if input is part of a combined character.  */                  \
 253         uint32_t ch_next = get32 (inptr + 4);                                 \
 254         while (cmbp->res2 != ch_next)                                         \
 255           {                                                                   \
 256             ++cmbp;                                                           \
 257             if (cmbp->res1 != ch)                                             \
 258               goto not_combined;                                              \
 259           }                                                                   \
 260                                                                               \
 261         /* It is a combined character.  First make sure we are in             \
 262            double byte mode.  */                                              \
 263         if (curcs == sb)                                                      \
 264           {                                                                   \
 265             /* We know there is room for at least one byte.  */               \
 266             *outptr++ = SO;                                                   \
 267             curcs = db;                                                       \
 268           }                                                                   \
 269                                                                               \
 270         if (__glibc_unlikely (outptr + 2 > outend))                           \
 271           {                                                                   \
 272             result = __GCONV_FULL_OUTPUT;                                     \
 273             break;                                                            \
 274           }                                                                   \
 275         *outptr++ = cmbp->ch[0];                                              \
 276         *outptr++ = cmbp->ch[1];                                              \
 277         inptr += 8;                                                           \
 278         continue;                                                             \
 279                                                                               \
 280       not_combined:;                                                          \
 281       }                                                                       \
 282   }
 283 #else
 284 # define SUB_COMBINED_UCS_TO_IBM13XX
 285 #endif /* HAS_COMBINED */
 286
 287
 288 /* Next, define the other direction.  */
 289 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
 290 #define MAX_NEEDED_INPUT        MAX_NEEDED_TO
 291 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
 292 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_FROM
 293 #define LOOPFCT                 TO_LOOP
 294 #define BODY \
 295   {                                                                           \
 296     uint32_t ch = get32 (inptr);                                              \
 297                                                                               \
 298     if (__glibc_unlikely (ch >= UCS_LIMIT))                                   \
 299       {                                                                       \
 300         UNICODE_TAG_HANDLER (ch, 4);                                          \
 301                                                                               \
 302         if (! ignore_errors_p ())                                             \
 303           {                                                                   \
 304             result = __GCONV_ILLEGAL_INPUT;                                   \
 305             break;                                                            \
 306           }                                                                   \
 307         ++*irreversible;                                                      \
 308         inptr += 4;                                                           \
 309         continue;                                                             \
 310       }                                                                       \
 311                                                                               \
 312     SUB_COMBINED_UCS_TO_IBM13XX;                                              \
 313                                                                               \
 314     const struct gap *rp1 = UCS4_TO_SB_IDX;                                   \
 315     while (ch > rp1->end)                                                     \
 316       ++rp1;                                                                  \
 317                                                                               \
 318     /* Use the UCS4 table for single byte.  */                                \
 319     const char *cp;                                                           \
 320     if (__builtin_expect (ch < rp1->start, 0)                                 \
 321         || (cp = UCS4_TO_SB[ch + rp1->idx],                                   \
 322             __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))          \
 323       {                                                                       \
 324         /* Use the UCS4 table for double byte.  */                            \
 325         const struct gap *rp2 = UCS4_TO_DB_IDX;                               \
 326         while (ch > rp2->end)                                                 \
 327           ++rp2;                                                              \
 328                                                                               \
 329         if (__builtin_expect (ch < rp2->start, 0)                             \
 330             || (cp = UCS4_TO_DB[ch + rp2->idx],                               \
 331                 __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))      \
 332           {                                                                   \
 333             /* This is an illegal character.  */                              \
 334             if (! ignore_errors_p ())                                         \
 335               {                                                               \
 336                 result = __GCONV_ILLEGAL_INPUT;                               \
 337                 break;                                                        \
 338               }                                                               \
 339             ++*irreversible;                                                  \
 340           }                                                                   \
 341         else                                                                  \
 342           {                                                                   \
 343             if (curcs == sb)                                                  \
 344               {                                                               \
 345                 /* We know there is room for at least one byte.  */           \
 346                 *outptr++ = SO;                                               \
 347                 curcs = db;                                                   \
 348               }                                                               \
 349                                                                               \
 350             if (__glibc_unlikely (outptr + 2 > outend))                       \
 351               {                                                               \
 352                 result = __GCONV_FULL_OUTPUT;                                 \
 353                 break;                                                        \
 354               }                                                               \
 355             *outptr++ = cp[0];                                                \
 356             *outptr++ = cp[1];                                                \
 357           }                                                                   \
 358       }                                                                       \
 359     else                                                                      \
 360       {                                                                       \
 361         if (__glibc_unlikely (curcs == db))                                   \
 362           {                                                                   \
 363             /* We know there is room for at least one byte.  */               \
 364             *outptr++ = SI;                                                   \
 365             curcs = sb;                                                       \
 366                                                                               \
 367             if (__glibc_unlikely (outptr >= outend))                          \
 368               {                                                               \
 369                 result = __GCONV_FULL_OUTPUT;                                 \
 370                 break;                                                        \
 371               }                                                               \
 372           }                                                                   \
 373                                                                               \
 374         *outptr++ = cp[0];                                                    \
 375       }                                                                       \
 376                                                                               \
 377     /* Now that we wrote the output increment the input pointer.  */          \
 378     inptr += 4;                                                               \
 379   }
 380 #define LOOP_NEED_FLAGS
 381 #define EXTRA_LOOP_DECLS        , int *curcsp
 382 #define INIT_PARAMS             int curcs = *curcsp & ~7
 383 #define REINIT_PARAMS           curcs = *curcsp & ~7
 384 #define UPDATE_PARAMS           *curcsp = curcs
 385 #include <iconv/loop.c>
 386
 387 /* Now define the toplevel functions.  */
 388 #include <iconv/skeleton.c>