iconvdata/ibm930.c

   1 /* Conversion from and to IBM930.
   2    Copyright (C) 2000-2020 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    <https://www.gnu.org/licenses/>.  */
  19
  20 /* IBM930 is designed for the representation of Japanese Katakana/Kanji
  21    using a stateful EBCDIC encoding scheme.  It is also known as
  22    CCSID 930 or CP930. See:
  23    https://www-01.ibm.com/software/globalization/ccsid/ccsid930.html */
  24
  25 #include <dlfcn.h>
  26 #include <stdint.h>
  27 #include <wchar.h>
  28 #include <byteswap.h>
  29 #include "ibm930.h"
  30
  31 /* The shift sequences for this charset (it does not use ESC). */
  32 #define SI              0x0F  /* Shift In, host code to turn DBCS off.  */
  33 #define SO              0x0E  /* Shift Out, host code to turn DBCS on.  */
  34
  35 /* Definitions used in the body of the `gconv' function.  */
  36 #define CHARSET_NAME    "IBM930//"
  37 #define FROM_LOOP       from_ibm930
  38 #define TO_LOOP         to_ibm930
  39 #define ONE_DIRECTION                   0
  40 #define FROM_LOOP_MIN_NEEDED_FROM       1
  41 #define FROM_LOOP_MAX_NEEDED_FROM       2
  42 #define FROM_LOOP_MIN_NEEDED_TO         4
  43 #define FROM_LOOP_MAX_NEEDED_TO         4
  44 #define TO_LOOP_MIN_NEEDED_FROM         4
  45 #define TO_LOOP_MAX_NEEDED_FROM         4
  46 #define TO_LOOP_MIN_NEEDED_TO           1
  47 #define TO_LOOP_MAX_NEEDED_TO           3
  48 #define PREPARE_LOOP \
  49   int save_curcs;                                                             \
  50   int *curcsp = &data->__statep->__count;
  51 #define EXTRA_LOOP_ARGS         , curcsp
  52
  53 /* Definitions of initialization and destructor function.  */
  54 #define DEFINE_INIT     1
  55 #define DEFINE_FINI     1
  56
  57
  58 /* Since this is a stateful encoding we have to provide code which resets
  59    the output state to the initial state.  This has to be done during the
  60    flushing.  */
  61 #define EMIT_SHIFT_TO_INIT \
  62   if ((data->__statep->__count & ~7) != sb)                                   \
  63     {                                                                         \
  64       if (FROM_DIRECTION)                                                     \
  65         data->__statep->__count &= 7;                                         \
  66       else                                                                    \
  67         {                                                                     \
  68           /* We are not in the initial state.  To switch back we have         \
  69              to emit `SI'.  */                                                \
  70           if (__glibc_unlikely (outbuf >= outend))                            \
  71             /* We don't have enough room in the output buffer.  */            \
  72             status = __GCONV_FULL_OUTPUT;                                     \
  73           else                                                                \
  74             {                                                                 \
  75               /* Write out the shift sequence.  */                            \
  76               *outbuf++ = SI;                                                 \
  77               data->__statep->__count &= 7;                                   \
  78             }                                                                 \
  79         }                                                                     \
  80     }
  81
  82
  83 /* Since we might have to reset input pointer we must be able to save
  84    and retore the state.  */
  85 #define SAVE_RESET_STATE(Save) \
  86   if (Save)                                                                   \
  87     save_curcs = *curcsp;                                                     \
  88   else                                                                        \
  89     *curcsp = save_curcs
  90
  91
  92 /* Current codeset type.  */
  93 enum
  94 {
  95   sb = 0,
  96   db = 64
  97 };
  98
  99
 100 /* First, define the conversion function from IBM-930 to UCS4.  */
 101 #define MIN_NEEDED_INPUT        FROM_LOOP_MIN_NEEDED_FROM
 102 #define MAX_NEEDED_INPUT        FROM_LOOP_MAX_NEEDED_FROM
 103 #define MIN_NEEDED_OUTPUT       FROM_LOOP_MIN_NEEDED_TO
 104 #define MAX_NEEDED_OUTPUT       FROM_LOOP_MAX_NEEDED_TO
 105 #define LOOPFCT                 FROM_LOOP
 106 #define BODY \
 107   {                                                                           \
 108     uint32_t ch = *inptr;                                                     \
 109     uint32_t res;                                                             \
 110                                                                               \
 111     if (__builtin_expect (ch, 0) == SO)                                       \
 112       {                                                                       \
 113         /* Shift OUT, change to DBCS converter (redundant escape okay).  */   \
 114         curcs = db;                                                           \
 115         ++inptr;                                                              \
 116         continue;                                                             \
 117       }                                                                       \
 118     else if (__builtin_expect (ch, 0) == SI)                                  \
 119       {                                                                       \
 120         /* Shift IN, change to SBCS converter (redundant escape okay).  */    \
 121         curcs = sb;                                                           \
 122         ++inptr;                                                              \
 123         continue;                                                             \
 124       }                                                                       \
 125                                                                               \
 126     if (curcs == sb)                                                          \
 127       {                                                                       \
 128         /* Use the IBM930 table for single byte.  */                          \
 129         res = __ibm930sb_to_ucs4[ch];                                         \
 130         if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0')             \
 131           {                                                                   \
 132             /* This is an illegal character.  */                              \
 133             STANDARD_FROM_LOOP_ERR_HANDLER (1);                               \
 134           }                                                                   \
 135         else                                                                  \
 136           {                                                                   \
 137             put32 (outptr, res);                                              \
 138             outptr += 4;                                                      \
 139           }                                                                   \
 140         ++inptr;                                                              \
 141       }                                                                       \
 142     else                                                                      \
 143       {                                                                       \
 144         /* Use the IBM930 table for double byte. */                           \
 145         const struct gap *rp2 = __ibm930db_to_ucs4_idx;                       \
 146                                                                               \
 147         assert (curcs == db);                                                 \
 148                                                                               \
 149         if (__glibc_unlikely (inptr + 1 >= inend))                            \
 150           {                                                                   \
 151             /* The second character is not available.  Store the              \
 152                intermediate result. */                                        \
 153             result = __GCONV_INCOMPLETE_INPUT;                                \
 154             break;                                                            \
 155           }                                                                   \
 156                                                                               \
 157         ch = (ch * 0x100) + inptr[1];                                         \
 158         while (ch > rp2->end)                                                 \
 159           ++rp2;                                                              \
 160                                                                               \
 161         if (__builtin_expect (rp2->start == 0xffff, 0)                        \
 162             || __builtin_expect (ch < rp2->start, 0)                          \
 163             || (res = __ibm930db_to_ucs4[ch + rp2->idx],                      \
 164                 __builtin_expect (res, L'\1') == L'\0' && ch != '\0'))        \
 165           {                                                                   \
 166             /* This is an illegal character.  */                              \
 167             STANDARD_FROM_LOOP_ERR_HANDLER (2);                               \
 168           }                                                                   \
 169         else                                                                  \
 170           {                                                                   \
 171             put32 (outptr, res);                                              \
 172             outptr += 4;                                                      \
 173           }                                                                   \
 174         inptr += 2;                                                           \
 175       }                                                                       \
 176   }
 177 #define LOOP_NEED_FLAGS
 178 #define EXTRA_LOOP_DECLS        , int *curcsp
 179 #define INIT_PARAMS             int curcs = *curcsp & ~7
 180 #define UPDATE_PARAMS           *curcsp = curcs
 181 #include <iconv/loop.c>
 182
 183 /* Next, define the other direction.  */
 184 #define MIN_NEEDED_INPUT        TO_LOOP_MIN_NEEDED_FROM
 185 #define MAX_NEEDED_INPUT        TO_LOOP_MAX_NEEDED_FROM
 186 #define MIN_NEEDED_OUTPUT       TO_LOOP_MIN_NEEDED_TO
 187 #define MAX_NEEDED_OUTPUT       TO_LOOP_MAX_NEEDED_TO
 188 #define LOOPFCT                 TO_LOOP
 189 #define BODY \
 190   {                                                                           \
 191     uint32_t ch = get32 (inptr);                                              \
 192     const struct gap *rp1 = __ucs4_to_ibm930sb_idx;                           \
 193     const struct gap *rp2 = __ucs4_to_ibm930db_idx;                           \
 194                                                                               \
 195     if (__glibc_unlikely (ch >= 0xffff))                                      \
 196       {                                                                       \
 197         UNICODE_TAG_HANDLER (ch, 4);                                          \
 198                                                                               \
 199         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 200       }                                                                       \
 201                                                                               \
 202     while (ch > rp1->end)                                                     \
 203       ++rp1;                                                                  \
 204                                                                               \
 205     /* Use the UCS4 table for single byte.  */                                \
 206     unsigned char sbconv;                                                     \
 207     if (__builtin_expect (ch < rp1->start, 0)                                 \
 208         || (sbconv = __ucs4_to_ibm930sb[ch + rp1->idx],                       \
 209             __builtin_expect (sbconv, L'\1') == L'\0' && ch != '\0'))         \
 210       {                                                                       \
 211         /* Use the UCS4 table for double byte. */                             \
 212         while (ch > rp2->end)                                                 \
 213           ++rp2;                                                              \
 214                                                                               \
 215         const char *cp;                                                       \
 216         if (__builtin_expect (ch < rp2->start, 0)                             \
 217             || (cp = __ucs4_to_ibm930db[ch + rp2->idx],                       \
 218                 __builtin_expect (cp[0], L'\1')== L'\0' && ch != '\0'))       \
 219           {                                                                   \
 220             /* This is an illegal character.  */                              \
 221             STANDARD_TO_LOOP_ERR_HANDLER (4);                                 \
 222           }                                                                   \
 223         else                                                                  \
 224           {                                                                   \
 225             if (curcs == sb)                                                  \
 226               {                                                               \
 227                 if (__glibc_unlikely (outptr + 1 > outend))                   \
 228                   {                                                           \
 229                     result = __GCONV_FULL_OUTPUT;                             \
 230                     break;                                                    \
 231                   }                                                           \
 232                 *outptr++ = SO;                                               \
 233                 curcs = db;                                                   \
 234               }                                                               \
 235                                                                               \
 236             if (__glibc_unlikely (outptr + 2 > outend))                       \
 237               {                                                               \
 238                 result = __GCONV_FULL_OUTPUT;                                 \
 239                 break;                                                        \
 240               }                                                               \
 241             *outptr++ = cp[0];                                                \
 242             *outptr++ = cp[1];                                                \
 243           }                                                                   \
 244       }                                                                       \
 245     else                                                                      \
 246       {                                                                       \
 247         if (curcs == db)                                                      \
 248           {                                                                   \
 249             if (__glibc_unlikely (outptr + 1 > outend))                       \
 250               {                                                               \
 251                 result = __GCONV_FULL_OUTPUT;                                 \
 252                 break;                                                        \
 253               }                                                               \
 254             *outptr++ = SI;                                                   \
 255             curcs = sb;                                                       \
 256           }                                                                   \
 257                                                                               \
 258         if (__glibc_unlikely (outptr + 1 > outend))                           \
 259           {                                                                   \
 260             result = __GCONV_FULL_OUTPUT;                                     \
 261             break;                                                            \
 262           }                                                                   \
 263         if (ch == 0x7e)                                                       \
 264           *outptr++ = 0xa1;                                                   \
 265         else if (ch == 0x5c)                                                  \
 266           *outptr++ = 0x5b;                                                   \
 267         else                                                                  \
 268           *outptr++ = sbconv;                                                 \
 269       }                                                                       \
 270                                                                               \
 271     /* Now that we wrote the output increment the input pointer.  */          \
 272     inptr += 4;                                                               \
 273   }
 274 #define LOOP_NEED_FLAGS
 275 #define EXTRA_LOOP_DECLS        , int *curcsp
 276 #define INIT_PARAMS             int curcs = *curcsp & ~7
 277 #define REINIT_PARAMS           curcs = *curcsp & ~7
 278 #define UPDATE_PARAMS           *curcsp = curcs
 279 #include <iconv/loop.c>
 280
 281 /* Now define the toplevel functions.  */
 282 #include <iconv/skeleton.c>