iconvdata/8bit-gap.c

   1 /* Generic conversion to and from 8bit charsets,
   2    converting from UCS using gaps.
   3    Copyright (C) 1997-2024 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   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
  23 struct gap
  24 {
  25   uint16_t start;
  26   uint16_t end;
  27   int32_t idx;
  28 };
  29
  30 /* Now we can include the tables.  */
  31 #include TABLES
  32
  33 #ifndef NONNUL
  34 # define NONNUL(c)      ((c) != '\0')
  35 #endif
  36
  37
  38 #define FROM_LOOP               from_gap
  39 #define TO_LOOP                 to_gap
  40 #define DEFINE_INIT             1
  41 #define DEFINE_FINI             1
  42 #define MIN_NEEDED_FROM         1
  43 #define MIN_NEEDED_TO           4
  44 #define ONE_DIRECTION           0
  45
  46
  47 /* First define the conversion function from the 8bit charset to UCS4.  */
  48 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
  49 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
  50 #define LOOPFCT                 FROM_LOOP
  51 #define BODY \
  52   {                                                                           \
  53     uint32_t ch = to_ucs4[*inptr];                                            \
  54                                                                               \
  55     if (HAS_HOLES && __builtin_expect (ch == L'\0', 0) && NONNUL (*inptr))    \
  56       {                                                                       \
  57         /* This is an illegal character.  */                                  \
  58         STANDARD_FROM_LOOP_ERR_HANDLER (1);                                   \
  59       }                                                                       \
  60     else                                                                      \
  61       {                                                                       \
  62         put32 (outptr, ch);                                                   \
  63         outptr += 4;                                                          \
  64       }                                                                       \
  65                                                                               \
  66     ++inptr;                                                                  \
  67   }
  68 #define LOOP_NEED_FLAGS
  69 #define ONEBYTE_BODY \
  70   {                                                                           \
  71     uint32_t ch = to_ucs4[c];                                                 \
  72                                                                               \
  73     if (HAS_HOLES && __builtin_expect (ch == L'\0', 0) && NONNUL (c))         \
  74       return WEOF;                                                            \
  75     else                                                                      \
  76       return ch;                                                              \
  77   }
  78 #include <iconv/loop.c>
  79
  80
  81 /* Next, define the other direction.  */
  82 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
  83 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
  84 #define LOOPFCT                 TO_LOOP
  85 #define BODY \
  86   {                                                                           \
  87     const struct gap *rp = from_idx;                                          \
  88     uint32_t ch = get32 (inptr);                                              \
  89     unsigned char res;                                                        \
  90                                                                               \
  91     if (__glibc_unlikely (ch >= 0xffff))                                      \
  92       {                                                                       \
  93         UNICODE_TAG_HANDLER (ch, 4);                                          \
  94         rp = NULL;                                                            \
  95       }                                                                       \
  96     else                                                                      \
  97       while (ch > rp->end)                                                    \
  98         ++rp;                                                                 \
  99     if (__builtin_expect (rp == NULL, 0)                                      \
 100         || __builtin_expect (ch < rp->start, 0)                               \
 101         || (res = from_ucs4[ch + rp->idx],                                    \
 102             __builtin_expect (res, '\1') == '\0' && ch != 0))                 \
 103       {                                                                       \
 104         /* This is an illegal character.  */                                  \
 105         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 106       }                                                                       \
 107                                                                               \
 108     *outptr++ = res;                                                          \
 109     inptr += 4;                                                               \
 110   }
 111 #define LOOP_NEED_FLAGS
 112 #include <iconv/loop.c>
 113
 114
 115 /* Now define the toplevel functions.  */
 116 #include <iconv/skeleton.c>