| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Access functions for JISX0212 conversion. |
| 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| 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 | #ifndef _JIS0212_H |
| 21 | #define _JIS0212_H 1 |
| 22 | |
| 23 | #include <assert.h> |
| 24 | #include <gconv.h> |
| 25 | #include <stdint.h> |
| 26 | |
| 27 | |
| 28 | /* Struct for table with indeces in mapping table. */ |
| 29 | struct jisx0212_idx |
| 30 | { |
| 31 | uint16_t start; |
| 32 | uint16_t end; |
| 33 | uint16_t idx; |
| 34 | }; |
| 35 | |
| 36 | /* Conversion table. */ |
| 37 | extern const struct jisx0212_idx __jisx0212_to_ucs_idx[]; |
| 38 | extern const uint16_t __jisx0212_to_ucs[]; |
| 39 | |
| 40 | extern const struct jisx0212_idx __jisx0212_from_ucs_idx[]; |
| 41 | extern const char __jisx0212_from_ucs[][2]; |
| 42 | |
| 43 | |
| 44 | static inline uint32_t |
| 45 | __attribute ((always_inline)) |
| 46 | jisx0212_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
| 47 | { |
| 48 | const struct jisx0212_idx *rp = __jisx0212_to_ucs_idx; |
| 49 | unsigned char ch = *(*s); |
| 50 | unsigned char ch2; |
| 51 | uint32_t wch = 0; |
| 52 | int idx; |
| 53 | |
| 54 | if (ch < offset || (ch - offset) < 0x22 || (ch - offset) > 0x6d) |
| 55 | return __UNKNOWN_10646_CHAR; |
| 56 | |
| 57 | if (avail < 2) |
| 58 | return 0; |
| 59 | |
| 60 | ch2 = (*s)[1]; |
| 61 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
| 62 | return __UNKNOWN_10646_CHAR; |
| 63 | |
| 64 | idx = (ch - offset - 0x21) * 94 + (ch2 - offset - 0x21); |
| 65 | |
| 66 | while (idx > rp->end) |
| 67 | ++rp; |
| 68 | if (idx >= rp->start) |
| 69 | wch = __jisx0212_to_ucs[rp->idx + idx - rp->start]; |
| 70 | |
| 71 | if (wch != L'\0') |
| 72 | (*s) += 2; |
| 73 | else |
| 74 | wch = __UNKNOWN_10646_CHAR; |
| 75 | |
| 76 | return wch; |
| 77 | } |
| 78 | |
| 79 | |
| 80 | static inline size_t |
| 81 | __attribute ((always_inline)) |
| 82 | ucs4_to_jisx0212 (uint32_t wch, unsigned char *s, size_t avail) |
| 83 | { |
| 84 | const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx; |
| 85 | unsigned int ch = (unsigned int) wch; |
| 86 | const char *cp; |
| 87 | |
| 88 | if (ch >= 0xffff) |
| 89 | return __UNKNOWN_10646_CHAR; |
| 90 | while (ch > rp->end) |
| 91 | ++rp; |
| 92 | if (ch >= rp->start) |
| 93 | cp = __jisx0212_from_ucs[rp->idx + ch - rp->start]; |
| 94 | else |
| 95 | return __UNKNOWN_10646_CHAR; |
| 96 | |
| 97 | if (cp[0] == '\0') |
| 98 | return __UNKNOWN_10646_CHAR; |
| 99 | |
| 100 | s[0] = cp[0]; |
| 101 | assert (cp[1] != '\0'); |
| 102 | if (avail < 2) |
| 103 | return 0; |
| 104 | |
| 105 | s[1] = cp[1]; |
| 106 | return 2; |
| 107 | } |
| 108 | |
| 109 | #endif /* jis0212.h */ |