[444] | 1 | /* Access functions for JISX0208 conversion. |
---|
| 2 | Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free |
---|
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
---|
| 19 | 02111-1307 USA. */ |
---|
| 20 | |
---|
| 21 | #ifndef _JIS0208_H |
---|
| 22 | #define _JIS0208_H 1 |
---|
| 23 | |
---|
| 24 | #include <gconv.h> |
---|
| 25 | #include <stdint.h> |
---|
| 26 | |
---|
| 27 | /* Struct for table with indeces in UCS mapping table. */ |
---|
| 28 | struct jisx0208_ucs_idx |
---|
| 29 | { |
---|
| 30 | uint16_t start; |
---|
| 31 | uint16_t end; |
---|
| 32 | uint16_t idx; |
---|
| 33 | }; |
---|
| 34 | |
---|
| 35 | /* Conversion table. */ |
---|
| 36 | extern const uint16_t __jis0208_to_ucs[]; |
---|
| 37 | |
---|
| 38 | extern const char __jisx0208_from_ucs4_lat1[256][2]; |
---|
| 39 | extern const char __jisx0208_from_ucs4_greek[0xc1][2]; |
---|
| 40 | extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[]; |
---|
| 41 | extern const char __jisx0208_from_ucs_tab[][2]; |
---|
| 42 | |
---|
| 43 | static inline uint32_t |
---|
| 44 | jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
---|
| 45 | { |
---|
| 46 | unsigned char ch = *(*s); |
---|
| 47 | unsigned char ch2; |
---|
| 48 | int idx; |
---|
| 49 | |
---|
| 50 | if (ch < offset || (ch - offset) <= 0x20) |
---|
| 51 | return __UNKNOWN_10646_CHAR; |
---|
| 52 | |
---|
| 53 | if (avail < 2) |
---|
| 54 | return 0; |
---|
| 55 | |
---|
| 56 | ch2 = (*s)[1]; |
---|
| 57 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
---|
| 58 | return __UNKNOWN_10646_CHAR; |
---|
| 59 | |
---|
| 60 | idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset); |
---|
| 61 | if (idx >= 0x1e80) |
---|
| 62 | return __UNKNOWN_10646_CHAR; |
---|
| 63 | |
---|
| 64 | (*s) += 2; |
---|
| 65 | |
---|
| 66 | return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR); |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | |
---|
| 70 | static inline size_t |
---|
| 71 | ucs4_to_jisx0208 (uint32_t wch, char *s, size_t avail) |
---|
| 72 | { |
---|
| 73 | unsigned int ch = (unsigned int) wch; |
---|
| 74 | const char *cp; |
---|
| 75 | |
---|
| 76 | if (avail < 2) |
---|
| 77 | return 0; |
---|
| 78 | |
---|
| 79 | if (ch < 0x100) |
---|
| 80 | cp = __jisx0208_from_ucs4_lat1[ch]; |
---|
| 81 | else if (ch >= 0x391 && ch <= 0x451) |
---|
| 82 | cp = __jisx0208_from_ucs4_greek[ch - 0x391]; |
---|
| 83 | else |
---|
| 84 | { |
---|
| 85 | const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx; |
---|
| 86 | |
---|
| 87 | if (ch >= 0xffff) |
---|
| 88 | return __UNKNOWN_10646_CHAR; |
---|
| 89 | while (ch > rp->end) |
---|
| 90 | ++rp; |
---|
| 91 | if (ch >= rp->start) |
---|
| 92 | cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start]; |
---|
| 93 | else |
---|
| 94 | return __UNKNOWN_10646_CHAR; |
---|
| 95 | } |
---|
| 96 | |
---|
| 97 | if (cp[0] == '\0') |
---|
| 98 | return __UNKNOWN_10646_CHAR; |
---|
| 99 | |
---|
| 100 | s[0] = cp[0]; |
---|
| 101 | s[1] = cp[1]; |
---|
| 102 | |
---|
| 103 | return 2; |
---|
| 104 | } |
---|
| 105 | |
---|
| 106 | #endif /* jis0208.h */ |
---|