iconvdata/ibm937.c

   1 /* Conversion from and to IBM937.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000.
   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 <dlfcn.h>
  21 #include <stdint.h>
  22 #include <wchar.h>
  23 #include <byteswap.h>
  24 #include "ibm937.h"
  25
  26 /* The shift sequences for this charset (it does not use ESC).  */
  27 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  28 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  29
  30 /* Definitions used in the body of the `gconv' function.  */
  31 #define CHARSET_NAME    "IBM937//"
  32 #define FROM_LOOP       from_ibm937
  33 #define TO_LOOP         to_ibm937
  34 #define FROM_LOOP_MIN_NEEDED_FROM       1
  35 #define FROM_LOOP_MAX_NEEDED_FROM       2
  36 #define FROM_LOOP_MIN_NEEDED_TO         4
  37 #define FROM_LOOP_MAX_NEEDED_TO         4
  38 #define TO_LOOP_MIN_NEEDED_FROM         4
  39 #define TO_LOOP_MAX_NEEDED_FROM         4
  40 #define TO_LOOP_MIN_NEEDED_TO           1
  41 #define TO_LOOP_MAX_NEEDED_TO           3
  42 #define PREPARE_LOOP \
  43   int save_curcs;                                                             \
  44   int *curcsp = &data->__statep->__count;
  45 #define EXTRA_LOOP_ARGS         , curcsp
  46
  47 /* Definitions of initialization and destructor function.  */
  48 #define DEFINE_INIT     1
  49 #define DEFINE_FINI     1
  50
  51
  52 /* Since this is a stateful encoding we have to provide code which resets
  53    the output state to the initial state.  This has to be done during the
  54    flushing.  */
  55 #define EMIT_SHIFT_TO_INIT \
  56   if ((data->__statep->__count & ~7) != sb)                                   \
  57     {                                                                         \
  58       if (FROM_DIRECTION)                                                     \
  59         data->__statep->__count &= 7;                                         \
  60       else                                                                    \
  61         {                                                                     \
  62           /* We are not in the initial state.  To switch back we have         \
  63              to emit `SI'.  */                                                \
  64           if (__builtin_expect (outbuf >= outend, 0))                         \
  65             /* We don't have enough room in the output buffer.  */            \
  66             status = __GCONV_FULL_OUTPUT;                                     \
  67           else                                                                \
  68             {                                                                 \
  69               /* Write out the shift sequence.  */                            \
  70               *outbuf++ = SI;                                                 \
  71               data->__statep->__count &= 7;                                   \
  72             }                                                                 \
  73         }                                                                     \
  74     }
  75
  76
  77 /* Since we might have to reset input pointer we must be able to save
  78    and retore the state.  */
  79 #define SAVE_RESET_STATE(Save) \
  80   if (Save)                                                                   \
  81     save_curcs = *curcsp;                                                     \
  82   else                                                                        \
  83     *curcsp = save_curcs
  84
  85
  86 /* Current codeset type.  */
  87 enum
  88 {
  89   sb = 0,
  90   db = 64
  91 };
  92
  93 /* First, define the conversion function from IBM-937 to UCS4.  */
  94 #define MIN_NEEDED_INPUT        FROM_LOOP_MIN_NEEDED_FROM
  95 #define MAX_NEEDED_INPUT        FROM_LOOP_MAX_NEEDED_FROM
  96 #define MIN_NEEDED_OUTPUT       FROM_LOOP_MIN_NEEDED_TO
  97 #define MAX_NEEDED_OUTPUT       FROM_LOOP_MAX_NEEDED_TO
  98 #define LOOPFCT                 FROM_LOOP
  99 #define BODY \
 100   {                                                                           \
 101     uint32_t ch = *inptr;                                                     \
 102     uint32_t res;                                                             \
 103                                                                               \
 104     if (__builtin_expect (ch, 0) == SO)                                       \
 105       {                                                                       \
 106         /* Shift OUT, change to DBCS converter.  */                           \
 107         if (curcs == db)                                                      \
 108           {                                                                   \
 109             result = __GCONV_ILLEGAL_INPUT;                                   \
 110             break;                                                            \
 111           }                                                                   \
 112         curcs = db;                                                           \
 113         ++inptr;                                                              \
 114         continue;                                                             \
 115       }                                                                       \
 116     else if (__builtin_expect (ch, 0) == SI)                                  \
 117       {                                                                       \
 118         /* Shift IN, change to SBCS converter.  */                            \
 119         if (curcs == sb)                                                      \
 120           {                                                                   \
 121             result = __GCONV_ILLEGAL_INPUT;                                   \
 122             break;                                                            \
 123           }                                                                   \
 124         curcs = sb;                                                           \
 125         ++inptr;                                                              \
 126         continue;                                                             \
 127       }                                                                       \
 128                                                                               \
 129     if (curcs == sb)                                                          \
 130       {                                                                       \
 131         /* Use the IBM937 table for single byte.  */                          \
 132         res = __ibm937sb_to_ucs4[ch];                                         \
 133         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 134           {                                                                   \
 135             /* This is an illegal character.  */                              \
 136             STANDARD_FROM_LOOP_ERR_HANDLER (1);                               \
 137           }                                                                   \
 138         else                                                                  \
 139           {                                                                   \
 140             put32 (outptr, res);                                              \
 141             outptr += 4;                                                      \
 142           }                                                                   \
 143         ++inptr;                                                              \
 144       }                                                                       \
 145     else                                                                      \
 146       {                                                                       \
 147         const struct gap *rp2 = __ibm937db_to_ucs4_idx;                       \
 148                                                                               \
 149         assert (curcs == db);                                                 \
 150                                                                               \
 151         /* Use the IBM937 table for double byte.  */                          \
 152         if (__builtin_expect (inptr + 1 >= inend, 0))                         \
 153           {                                                                   \
 154             /* The second character is not available.                         \
 155                Store the intermediate result. */                              \
 156             result = __GCONV_INCOMPLETE_INPUT;                                \
 157             break;                                                            \
 158           }                                                                   \
 159                                                                               \
 160         ch = (ch * 0x100) + inptr[1];                                         \
 161         while (ch > rp2->end)                                                 \
 162           ++rp2;                                                              \
 163                                                                               \
 164         if (__builtin_expect (rp2 == NULL, 0)                                 \
 165             || __builtin_expect (ch < rp2->start, 0)                          \
 166             || (res = __ibm937db_to_ucs4[ch + rp2->idx],                      \
 167                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 168           {                                                                   \
 169             /* This is an illegal character.  */                              \
 170             STANDARD_FROM_LOOP_ERR_HANDLER (2);                               \
 171           }                                                                   \
 172         else                                                                  \
 173           {                                                                   \
 174             put32 (outptr, res);                                              \
 175             outptr += 4;                                                      \
 176           }                                                                   \
 177         inptr += 2;                                                           \
 178       }                                                                       \
 179   }
 180 #define LOOP_NEED_FLAGS
 181 #define EXTRA_LOOP_DECLS        , int *curcsp
 182 #define INIT_PARAMS             int curcs = *curcsp & ~7
 183 #define UPDATE_PARAMS           *curcsp = curcs
 184 #include <iconv/loop.c>
 185
 186 /* Next, define the other direction.  */
 187 #define MIN_NEEDED_INPUT        TO_LOOP_MIN_NEEDED_FROM
 188 #define MAX_NEEDED_INPUT        TO_LOOP_MAX_NEEDED_FROM
 189 #define MIN_NEEDED_OUTPUT       TO_LOOP_MIN_NEEDED_TO
 190 #define MAX_NEEDED_OUTPUT       TO_LOOP_MAX_NEEDED_TO
 191 #define LOOPFCT                 TO_LOOP
 192 #define BODY \
 193   {                                                                           \
 194     uint32_t ch = get32 (inptr);                                              \
 195     const struct gap *rp1 = __ucs4_to_ibm937sb_idx;                           \
 196     const struct gap *rp2 = __ucs4_to_ibm937db_idx;                           \
 197     const char *cp;                                                           \
 198                                                                               \
 199     if (__builtin_expect (ch >= 0xffff, 0))                                   \
 200       {                                                                       \
 201         UNICODE_TAG_HANDLER (ch, 4);                                          \
 202                                                                               \
 203         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 204       }                                                                       \
 205                                                                               \
 206     while (ch > rp1->end)                                                     \
 207       ++rp1;                                                                  \
 208                                                                               \
 209     /* Use the UCS4 table for single byte.  */                                \
 210     if (__builtin_expect (ch < rp1->start, 0)                                 \
 211         || (cp = __ucs4_to_ibm937sb[ch + rp1->idx],                           \
 212             __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))          \
 213       {                                                                       \
 214         /* Use the UCS4 table for double byte. */                             \
 215         while (ch > rp2->end)                                                 \
 216           ++rp2;                                                              \
 217                                                                               \
 218         if (__builtin_expect (ch < rp2->start, 0)                             \
 219             || (cp = __ucs4_to_ibm937db[ch + rp2->idx],                       \
 220                 __builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0'))        \
 221           {                                                                   \
 222             /* This is an illegal character.  */                              \
 223             STANDARD_TO_LOOP_ERR_HANDLER (4);                                 \
 224           }                                                                   \
 225         else                                                                  \
 226           {                                                                   \
 227             if (curcs == sb)                                                  \
 228               {                                                               \
 229                 if (__builtin_expect (outptr + 1 > outend, 0))                \
 230                   {                                                           \
 231                     result = __GCONV_FULL_OUTPUT;                             \
 232                     break;                                                    \
 233                   }                                                           \
 234                 *outptr++ = SO;                                               \
 235                 curcs = db;                                                   \
 236               }                                                               \
 237                                                                               \
 238             if (__builtin_expect (outptr + 2 > outend, 0))                    \
 239               {                                                               \
 240                 result = __GCONV_FULL_OUTPUT;                                 \
 241                 break;                                                        \
 242               }                                                               \
 243             *outptr++ = cp[0];                                                \
 244             *outptr++ = cp[1];                                                \
 245           }                                                                   \
 246       }                                                                       \
 247     else                                                                      \
 248       {                                                                       \
 249         if (curcs == db)                                                      \
 250           {                                                                   \
 251             if (__builtin_expect (outptr + 1 > outend, 0))                    \
 252               {                                                               \
 253                 result = __GCONV_FULL_OUTPUT;                                 \
 254                 break;                                                        \
 255               }                                                               \
 256             *outptr++ = SI;                                                   \
 257           }                                                                   \
 258                                                                               \
 259         if (__builtin_expect (outptr + 1 > outend, 0))                        \
 260           {                                                                   \
 261             result = __GCONV_FULL_OUTPUT;                                     \
 262             break;                                                            \
 263           }                                                                   \
 264         *outptr++ = cp[0];                                                    \
 265         curcs = sb;                                                           \
 266       }                                                                       \
 267                                                                               \
 268     /* Now that we wrote the output increment the input pointer.  */          \
 269     inptr += 4;                                                               \
 270   }
 271 #define LOOP_NEED_FLAGS
 272 #define EXTRA_LOOP_DECLS        , int *curcsp
 273 #define INIT_PARAMS             int curcs = *curcsp & ~7
 274 #define REINIT_PARAMS           curcs = *curcsp & ~7
 275 #define UPDATE_PARAMS           *curcsp = curcs
 276 #include <iconv/loop.c>
 277
 278 /* Now define the toplevel functions.  */
 279 #include <iconv/skeleton.c>