iconvdata/ibm935.c

   1 /* Conversion from and to IBM935
   2    Copyright (C) 2000, 2001 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <dlfcn.h>
  22 #include <stdint.h>
  23 #include <wchar.h>
  24 #include <byteswap.h>
  25 #include "ibm935.h"
  26
  27 /* The shift sequences for this charset (it does not use ESC).  */
  28 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  29 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  30
  31 /* Definitions used in the body of the `gconv' function.  */
  32 #define CHARSET_NAME    "IBM935//"
  33 #define FROM_LOOP       from_ibm935
  34 #define TO_LOOP         to_ibm935
  35 #define MIN_NEEDED_FROM 1
  36 #define MAX_NEEDED_FROM 2
  37 #define MIN_NEEDED_TO   4
  38 #define MAX_NEEDED_TO   4
  39 #define PREPARE_LOOP \
  40   int save_curcs;                                                             \
  41   int *curcsp = &data->__statep->__count;
  42 #define EXTRA_LOOP_ARGS         , curcsp
  43
  44 /* Definitions of initialization and destructor function.  */
  45 #define DEFINE_INIT     1
  46 #define DEFINE_FINI     1
  47
  48
  49 /* Since this is a stateful encoding we have to provide code which resets
  50    the output state to the initial state.  This has to be done during the
  51    flushing.  */
  52 #define EMIT_SHIFT_TO_INIT \
  53   if ((data->__statep->__count & ~7) != sb)                                   \
  54     {                                                                         \
  55       if (FROM_DIRECTION)                                                     \
  56         data->__statep->__count &= 7;                                         \
  57       else                                                                    \
  58         {                                                                     \
  59           unsigned char *outbuf = data->__outbuf;                             \
  60                                                                               \
  61           /* We are not in the initial state.  To switch back we have         \
  62              to emit `SI'.  */                                                \
  63           if (__builtin_expect (outbuf >= data->__outbufend, 0))              \
  64             /* We don't have enough room in the output buffer.  */            \
  65             status = __GCONV_FULL_OUTPUT;                                     \
  66           else                                                                \
  67             {                                                                 \
  68               /* Write out the shift sequence.  */                            \
  69               *outbuf++ = SI;                                                 \
  70               data->__outbuf = outbuf;                                        \
  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-935 to UCS4.  */
  94 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
  95 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
  96 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
  97 #define LOOPFCT                 FROM_LOOP
  98 #define BODY \
  99   {                                                                           \
 100     uint32_t ch = *inptr;                                                     \
 101     uint32_t res;                                                             \
 102                                                                               \
 103     if (__builtin_expect(ch, 0) == SO)                                        \
 104       {                                                                       \
 105         /* Shift OUT, change to DBCS converter.  */                           \
 106         if (curcs == db)                                                      \
 107           {                                                                   \
 108             result = __GCONV_ILLEGAL_INPUT;                                   \
 109             break;                                                            \
 110           }                                                                   \
 111         curcs = db;                                                           \
 112         ++inptr;                                                              \
 113         continue;                                                             \
 114       }                                                                       \
 115     else if (__builtin_expect (ch, 0) == SI)                                  \
 116       {                                                                       \
 117         /* Shift IN, change to SBCS converter.  */                            \
 118         if (curcs == sb)                                                      \
 119           {                                                                   \
 120             result = __GCONV_ILLEGAL_INPUT;                                   \
 121             break;                                                            \
 122           }                                                                   \
 123         curcs = sb;                                                           \
 124         ++inptr;                                                              \
 125         continue;                                                             \
 126       }                                                                       \
 127                                                                               \
 128     if (curcs == sb)                                                          \
 129       {                                                                       \
 130         /* Use the IBM935 table for single byte.  */                          \
 131         res = __ibm935sb_to_ucs4[ch];                                         \
 132         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 133           {                                                                   \
 134             /* This is an illegal character.  */                              \
 135             if (! ignore_errors_p ())                                         \
 136               {                                                               \
 137                 result = __GCONV_ILLEGAL_INPUT;                               \
 138                 break;                                                        \
 139               }                                                               \
 140             ++*irreversible;                                                  \
 141           }                                                                   \
 142         else                                                                  \
 143           {                                                                   \
 144             put32 (outptr, res);                                              \
 145             outptr += 4;                                                      \
 146           }                                                                   \
 147         ++inptr;                                                              \
 148       }                                                                       \
 149     else                                                                      \
 150       {                                                                       \
 151         const struct gap *rp2 = __ibm935db_to_ucs4_idx;                       \
 152                                                                               \
 153         assert (curcs == db);                                                 \
 154                                                                               \
 155         /* Use the IBM935 table for double byte.  */                          \
 156         if (__builtin_expect (inptr + 1 >= inend, 0))                         \
 157           {                                                                   \
 158             /* The second character is not available.                         \
 159                Store the intermediate result. */                              \
 160             result = __GCONV_INCOMPLETE_INPUT;                                \
 161             break;                                                            \
 162           }                                                                   \
 163                                                                               \
 164         ch = (ch * 0x100) + inptr[1];                                         \
 165         while (ch > rp2->end)                                                 \
 166           ++rp2;                                                              \
 167                                                                               \
 168         if (__builtin_expect (rp2 == NULL, 0)                                 \
 169             || __builtin_expect (ch < rp2->start, 0)                          \
 170             || (res = __ibm935db_to_ucs4[ch + rp2->idx],                      \
 171                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 172           {                                                                   \
 173             /* This is an illegal character.  */                              \
 174             if (! ignore_errors_p ())                                         \
 175               {                                                               \
 176                 result = __GCONV_ILLEGAL_INPUT;                               \
 177                 break;                                                        \
 178               }                                                               \
 179             ++*irreversible;                                                  \
 180           }                                                                   \
 181         else                                                                  \
 182           {                                                                   \
 183             put32 (outptr, res);                                              \
 184             outptr += 4;                                                      \
 185           }                                                                   \
 186         inptr += 2;                                                           \
 187       }                                                                       \
 188   }
 189 #define LOOP_NEED_FLAGS
 190 #define EXTRA_LOOP_DECLS        , int *curcsp
 191 #define INIT_PARAMS             int curcs = *curcsp & ~7
 192 #define UPDATE_PARAMS           *curcsp = curcs
 193 #include <iconv/loop.c>
 194
 195 /* Next, define the other direction.  */
 196 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
 197 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
 198 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_FROM
 199 #define LOOPFCT                 TO_LOOP
 200 #define BODY \
 201   {                                                                           \
 202     uint32_t ch = get32 (inptr);                                              \
 203     const struct gap *rp1 = __ucs4_to_ibm935sb_idx;                           \
 204     const struct gap *rp2 = __ucs4_to_ibm935db_idx;                           \
 205     const char *cp;                                                           \
 206                                                                               \
 207     if (__builtin_expect (ch, 0) >= 0xffff)                                   \
 208       {                                                                       \
 209         if (! ignore_errors_p ())                                             \
 210           {                                                                   \
 211             result = __GCONV_ILLEGAL_INPUT;                                   \
 212             break;                                                            \
 213           }                                                                   \
 214         ++*irreversible;                                                      \
 215         inptr += 4;                                                           \
 216         continue;                                                             \
 217       }                                                                       \
 218                                                                               \
 219     while (ch > rp1->end)                                                     \
 220       ++rp1;                                                                  \
 221                                                                               \
 222     /* Use the UCS4 table for single byte.  */                                \
 223     if (__builtin_expect (ch < rp1->start, 0)                                 \
 224         || (cp = __ucs4_to_ibm935sb[ch + rp1->idx],                           \
 225             __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0'))          \
 226       {                                                                       \
 227         /* Use the UCS4 table for double byte. */                             \
 228         while (ch > rp2->end)                                                 \
 229           ++rp2;                                                              \
 230                                                                               \
 231         if (__builtin_expect (ch < rp2->start, 0)                             \
 232             || (cp = __ucs4_to_ibm935db[ch + rp2->idx],                       \
 233                 __builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0'))        \
 234           {                                                                   \
 235             /* This is an illegal character.  */                              \
 236             if (! ignore_errors_p ())                                         \
 237               {                                                               \
 238                 result = __GCONV_ILLEGAL_INPUT;                               \
 239                 break;                                                        \
 240               }                                                               \
 241             ++*irreversible;                                                  \
 242           }                                                                   \
 243         else                                                                  \
 244           {                                                                   \
 245             if (curcs == sb)                                                  \
 246               {                                                               \
 247                 if (__builtin_expect (outptr+1 > outend, 0))                  \
 248                   {                                                           \
 249                     result = __GCONV_FULL_OUTPUT;                             \
 250                     break;                                                    \
 251                   }                                                           \
 252                 *outptr++ = SO;                                               \
 253                 curcs = db;                                                   \
 254               }                                                               \
 255                                                                               \
 256             if (__builtin_expect (outptr + 2 > outend, 0))                    \
 257               {                                                               \
 258                 result = __GCONV_FULL_OUTPUT;                                 \
 259                 break;                                                        \
 260               }                                                               \
 261             *outptr++ = cp[0];                                                \
 262             *outptr++ = cp[1];                                                \
 263           }                                                                   \
 264       }                                                                       \
 265     else                                                                      \
 266       {                                                                       \
 267         if (curcs == db)                                                      \
 268           {                                                                   \
 269             if (__builtin_expect (outptr + 1 > outend, 0))                    \
 270               {                                                               \
 271                 result = __GCONV_FULL_OUTPUT;                                 \
 272                 break;                                                        \
 273               }                                                               \
 274             *outptr++ = SI;                                                   \
 275           }                                                                   \
 276                                                                               \
 277         if (__builtin_expect (outptr + 1 > outend, 0))                        \
 278           {                                                                   \
 279             result = __GCONV_FULL_OUTPUT;                                     \
 280             break;                                                            \
 281           }                                                                   \
 282         *outptr++ = cp[0];                                                    \
 283         curcs = sb;                                                           \
 284       }                                                                       \
 285                                                                               \
 286     /* Now that we wrote the output increment the input pointer.  */          \
 287     inptr += 4;                                                               \
 288   }
 289 #define LOOP_NEED_FLAGS
 290 #define EXTRA_LOOP_DECLS        , int *curcsp
 291 #define INIT_PARAMS             int curcs = *curcsp & ~7
 292 #define UPDATE_PARAMS           *curcsp = curcs
 293 #include <iconv/loop.c>
 294
 295 /* Now define the toplevel functions.  */
 296 #include <iconv/skeleton.c>