| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Access functions for JISX0208 conversion. |
| 2 | Copyright (C) 1997-2016 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 _JIS0208_H |
| 21 | #define _JIS0208_H 1 |
| 22 | |
| 23 | #include <gconv.h> |
| 24 | #include <stdint.h> |
| 25 | |
| 26 | /* Struct for table with indeces in UCS mapping table. */ |
| 27 | struct jisx0208_ucs_idx |
| 28 | { |
| 29 | uint16_t start; |
| 30 | uint16_t end; |
| 31 | uint16_t idx; |
| 32 | }; |
| 33 | |
| 34 | |
| 35 | /* Conversion table. */ |
| 36 | extern const uint16_t __jis0208_to_ucs[]; |
| 37 | |
| 38 | #define JIS0208_LAT1_MIN 0xa2 |
| 39 | #define JIS0208_LAT1_MAX 0xf7 |
| 40 | extern const char __jisx0208_from_ucs4_lat1[JIS0208_LAT1_MAX + 1 |
| 41 | - JIS0208_LAT1_MIN][2]; |
| 42 | extern const char __jisx0208_from_ucs4_greek[0xc1][2]; |
| 43 | extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[]; |
| 44 | extern const char __jisx0208_from_ucs_tab[][2]; |
| 45 | |
| 46 | |
| 47 | static inline uint32_t |
| 48 | __attribute ((always_inline)) |
| 49 | jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
| 50 | { |
| 51 | unsigned char ch = *(*s); |
| 52 | unsigned char ch2; |
| 53 | int idx; |
| 54 | |
| 55 | if (ch < offset || (ch - offset) <= 0x20) |
| 56 | return __UNKNOWN_10646_CHAR; |
| 57 | |
| 58 | if (avail < 2) |
| 59 | return 0; |
| 60 | |
| 61 | ch2 = (*s)[1]; |
| 62 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
| 63 | return __UNKNOWN_10646_CHAR; |
| 64 | |
| 65 | idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset); |
| 66 | if (idx >= 0x1e80) |
| 67 | return __UNKNOWN_10646_CHAR; |
| 68 | |
| 69 | (*s) += 2; |
| 70 | |
| 71 | return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | static inline size_t |
| 76 | __attribute ((always_inline)) |
| 77 | ucs4_to_jisx0208 (uint32_t wch, unsigned char *s, size_t avail) |
| 78 | { |
| 79 | unsigned int ch = (unsigned int) wch; |
| 80 | const char *cp; |
| 81 | |
| 82 | if (avail < 2) |
| 83 | return 0; |
| 84 | |
| 85 | if (ch >= JIS0208_LAT1_MIN && ch <= JIS0208_LAT1_MAX) |
| 86 | cp = __jisx0208_from_ucs4_lat1[ch - JIS0208_LAT1_MIN]; |
| 87 | else if (ch >= 0x391 && ch <= 0x451) |
| 88 | cp = __jisx0208_from_ucs4_greek[ch - 0x391]; |
| 89 | else |
| 90 | { |
| 91 | const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx; |
| 92 | |
| 93 | if (ch >= 0xffff) |
| 94 | return __UNKNOWN_10646_CHAR; |
| 95 | while (ch > rp->end) |
| 96 | ++rp; |
| 97 | if (ch >= rp->start) |
| 98 | cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start]; |
| 99 | else |
| 100 | return __UNKNOWN_10646_CHAR; |
| 101 | } |
| 102 | |
| 103 | if (cp[0] == '\0') |
| 104 | return __UNKNOWN_10646_CHAR; |
| 105 | |
| 106 | s[0] = cp[0]; |
| 107 | s[1] = cp[1]; |
| 108 | |
| 109 | return 2; |
| 110 | } |
| 111 | |
| 112 | #endif /* jis0208.h */ |