iconvdata/ibm933.c

   1 /* Conversion from and to IBM933.
   2    Copyright (C) 2000-2024 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 /* IBM933 is designed for the representation of Korean using a stateful
  20    EBCDIC encoding scheme.  It is also known as CCSID 933 or CP933. See:
  21    https://www-01.ibm.com/software/globalization/ccsid/ccsid933.html */
  22
  23 #include <dlfcn.h>
  24 #include <stdint.h>
  25 #include <wchar.h>
  26 #include <byteswap.h>
  27 #include "ibm933.h"
  28
  29 /* The shift sequences for this charset (it does not use ESC).  */
  30 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  31 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  32
  33 /* Definitions used in the body of the `gconv' function.  */
  34 #define CHARSET_NAME    "IBM933//"
  35 #define FROM_LOOP       from_ibm933
  36 #define TO_LOOP         to_ibm933
  37 #define ONE_DIRECTION                   0
  38 #define FROM_LOOP_MIN_NEEDED_FROM       1
  39 #define FROM_LOOP_MAX_NEEDED_FROM       2
  40 #define FROM_LOOP_MIN_NEEDED_TO         4
  41 #define FROM_LOOP_MAX_NEEDED_TO         4
  42 #define TO_LOOP_MIN_NEEDED_FROM         4
  43 #define TO_LOOP_MAX_NEEDED_FROM         4
  44 #define TO_LOOP_MIN_NEEDED_TO           1
  45 #define TO_LOOP_MAX_NEEDED_TO           3
  46 #define PREPARE_LOOP \
  47   int save_curcs;                                                             \
  48   int *curcsp = &data->__statep->__count;
  49 #define EXTRA_LOOP_ARGS         , curcsp
  50
  51 /* Definitions of initialization and destructor function.  */
  52 #define DEFINE_INIT     1
  53 #define DEFINE_FINI     1
  54
  55
  56 /* Since this is a stateful encoding we have to provide code which resets
  57    the output state to the initial state.  This has to be done during the
  58    flushing.  */
  59 #define EMIT_SHIFT_TO_INIT \
  60   if ((data->__statep->__count & ~7) != sb)                                   \
  61     {                                                                         \
  62       if (FROM_DIRECTION)                                                     \
  63         data->__statep->__count &= 7;                                         \
  64       else                                                                    \
  65         {                                                                     \
  66           /* We are not in the initial state.  To switch back we have         \
  67              to emit `SI'.  */                                                \
  68           if (__glibc_unlikely (outbuf >= outend))                            \
  69             /* We don't have enough room in the output buffer.  */            \
  70             status = __GCONV_FULL_OUTPUT;                                     \
  71           else                                                                \
  72             {                                                                 \
  73               /* Write out the shift sequence.  */                            \
  74               *outbuf++ = SI;                                                 \
  75               data->__statep->__count &= 7;                                   \
  76             }                                                                 \
  77         }                                                                     \
  78     }
  79
  80
  81 /* Since we might have to reset input pointer we must be able to save
  82    and restore the state.  */
  83 #define SAVE_RESET_STATE(Save) \
  84   if (Save)                                                                   \
  85     save_curcs = *curcsp;                                                     \
  86   else                                                                        \
  87     *curcsp = save_curcs
  88
  89
  90 /* Current codeset type.  */
  91 enum
  92 {
  93   sb = 0,
  94   db = 64
  95 };
  96
  97 /* First, define the conversion function from IBM-933 to UCS4.  */
  98 #define MIN_NEEDED_INPUT        FROM_LOOP_MIN_NEEDED_FROM
  99 #define MAX_NEEDED_INPUT        FROM_LOOP_MAX_NEEDED_FROM
 100 #define MIN_NEEDED_OUTPUT       FROM_LOOP_MIN_NEEDED_TO
 101 #define MAX_NEEDED_OUTPUT       FROM_LOOP_MAX_NEEDED_TO
 102 #define LOOPFCT                 FROM_LOOP
 103 #define BODY \
 104   {                                                                           \
 105     uint32_t ch = *inptr;                                                     \
 106     uint32_t res;                                                             \
 107                                                                               \
 108     if (__builtin_expect (ch, 0) == SO)                                       \
 109       {                                                                       \
 110         /* Shift OUT, change to DBCS converter (redundant escape okay).  */   \
 111         curcs = db;                                                           \
 112         ++inptr;                                                              \
 113         continue;                                                             \
 114       }                                                                       \
 115     else if (__builtin_expect (ch, 0) == SI)                                  \
 116       {                                                                       \
 117         /* Shift IN, change to SBCS converter (redundant escape okay).  */    \
 118         curcs = sb;                                                           \
 119         ++inptr;                                                              \
 120         continue;                                                             \
 121       }                                                                       \
 122                                                                               \
 123     if (curcs == sb)                                                          \
 124       {                                                                       \
 125         /* Use the IBM933 table for single byte.  */                          \
 126         res = __ibm933sb_to_ucs4[ch];                                         \
 127         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 128           {                                                                   \
 129             /* This is an illegal character.  */                              \
 130             STANDARD_FROM_LOOP_ERR_HANDLER (1);                               \
 131           }                                                                   \
 132         else                                                                  \
 133           {                                                                   \
 134             put32 (outptr, res);                                              \
 135             outptr += 4;                                                      \
 136           }                                                                   \
 137         ++inptr;                                                              \
 138       }                                                                       \
 139     else                                                                      \
 140       {                                                                       \
 141         const struct gap *rp2 = __ibm933db_to_ucs4_idx;                       \
 142                                                                               \
 143         assert (curcs == db);                                                 \
 144                                                                               \
 145         /* Use the IBM933 table for double byte.  */                          \
 146         if (__glibc_unlikely (inptr + 1 >= inend))                            \
 147           {                                                                   \
 148             /* The second character is not available.  Store the              \
 149                intermediate result. */                                        \
 150             result = __GCONV_INCOMPLETE_INPUT;                                \
 151             break;                                                            \
 152           }                                                                   \
 153                                                                               \
 154         ch = (ch * 0x100) + inptr[1];                                         \
 155         while (ch > rp2->end)                                                 \
 156           ++rp2;                                                              \
 157                                                                               \
 158         if (__builtin_expect (rp2->start == 0xffff, 0)                        \
 159             || __builtin_expect (ch < rp2->start, 0)                          \
 160             || (res = __ibm933db_to_ucs4[ch + rp2->idx],                      \
 161                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 162           {                                                                   \
 163             /* This is an illegal character.  */                              \
 164             STANDARD_FROM_LOOP_ERR_HANDLER (2);                               \
 165           }                                                                   \
 166         else                                                                  \
 167           {                                                                   \
 168             put32 (outptr, res);                                              \
 169             outptr += 4;                                                      \
 170             inptr += 2;                                                       \
 171           }                                                                   \
 172       }                                                                       \
 173   }
 174 #define LOOP_NEED_FLAGS
 175 #define EXTRA_LOOP_DECLS        , int *curcsp
 176 #define INIT_PARAMS             int curcs = *curcsp & ~7
 177 #define UPDATE_PARAMS           *curcsp = curcs
 178 #include <iconv/loop.c>
 179
 180 /* Next, define the other direction.  */
 181 #define MIN_NEEDED_INPUT        TO_LOOP_MIN_NEEDED_FROM
 182 #define MAX_NEEDED_INPUT        TO_LOOP_MAX_NEEDED_FROM
 183 #define MIN_NEEDED_OUTPUT       TO_LOOP_MIN_NEEDED_TO
 184 #define MAX_NEEDED_OUTPUT       TO_LOOP_MAX_NEEDED_TO
 185 #define LOOPFCT                 TO_LOOP
 186 #define BODY \
 187   {                                                                           \
 188     uint32_t ch = get32 (inptr);                                              \
 189     const struct gap *rp1 = __ucs4_to_ibm933sb_idx;                           \
 190     const struct gap *rp2 = __ucs4_to_ibm933db_idx;                           \
 191                                                                               \
 192     if (__glibc_unlikely (ch >= 0xffff))                                      \
 193       {                                                                       \
 194         UNICODE_TAG_HANDLER (ch, 4);                                          \
 195                                                                               \
 196         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 197       }                                                                       \
 198                                                                               \
 199     while (ch > rp1->end)                                                     \
 200       ++rp1;                                                                  \
 201                                                                               \
 202     /* Use the UCS4 table for single byte.  */                                \
 203     unsigned char sbconv;                                                     \
 204     if (__builtin_expect (ch < rp1->start, 0)                                 \
 205         || (sbconv = __ucs4_to_ibm933sb[ch + rp1->idx],                       \
 206             __builtin_expect (sbconv, L'\1') == L'\0' && ch != '\0'))         \
 207       {                                                                       \
 208         /* Use the UCS4 table for double byte.  */                            \
 209         while (ch > rp2->end)                                                 \
 210           ++rp2;                                                              \
 211                                                                               \
 212         const char *cp;                                                       \
 213         if (__builtin_expect (ch < rp2->start, 0)                             \
 214             || (cp = __ucs4_to_ibm933db[ch + rp2->idx],                       \
 215                 __builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0'))        \
 216           {                                                                   \
 217             /* This is an illegal character.  */                              \
 218             STANDARD_TO_LOOP_ERR_HANDLER (4);                                 \
 219           }                                                                   \
 220         else                                                                  \
 221           {                                                                   \
 222             if (curcs == sb)                                                  \
 223               {                                                               \
 224                 if (__glibc_unlikely (outptr + 1 > outend))                   \
 225                   {                                                           \
 226                     result = __GCONV_FULL_OUTPUT;                             \
 227                     break;                                                    \
 228                   }                                                           \
 229                 *outptr++ = SO;                                               \
 230                 curcs = db;                                                   \
 231               }                                                               \
 232                                                                               \
 233             if (__glibc_unlikely (outptr + 2 > outend))                       \
 234               {                                                               \
 235                 result = __GCONV_FULL_OUTPUT;                                 \
 236                 break;                                                        \
 237               }                                                               \
 238             *outptr++ = cp[0];                                                \
 239             *outptr++ = cp[1];                                                \
 240           }                                                                   \
 241       }                                                                       \
 242     else                                                                      \
 243       {                                                                       \
 244         if (curcs == db)                                                      \
 245           {                                                                   \
 246             if (__glibc_unlikely (outptr + 1 > outend))                       \
 247               {                                                               \
 248                 result = __GCONV_FULL_OUTPUT;                                 \
 249                 break;                                                        \
 250               }                                                               \
 251             *outptr++ = SI;                                                   \
 252             curcs = sb;                                                       \
 253           }                                                                   \
 254                                                                               \
 255         if (__glibc_unlikely (outptr + 1 > outend))                           \
 256           {                                                                   \
 257             result = __GCONV_FULL_OUTPUT;                                     \
 258             break;                                                            \
 259           }                                                                   \
 260         *outptr++ = sbconv;                                                   \
 261       }                                                                       \
 262                                                                               \
 263     /* Now that we wrote the output increment the input pointer.  */          \
 264     inptr += 4;                                                               \
 265   }
 266 #define LOOP_NEED_FLAGS
 267 #define EXTRA_LOOP_DECLS        , int *curcsp
 268 #define INIT_PARAMS             int curcs = *curcsp & ~7
 269 #define REINIT_PARAMS           curcs = *curcsp & ~7
 270 #define UPDATE_PARAMS           *curcsp = curcs
 271 #include <iconv/loop.c>
 272
 273 /* Now define the toplevel functions.  */
 274 #include <iconv/skeleton.c>