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04be94a8 | 1 | /* Access functions for JISX0212 conversion. |
2b474353 | 2 | Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
04be94a8 UD |
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 Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | 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 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #ifndef _JIS0212_H | |
22 | #define _JIS0212_H 1 | |
23 | ||
24 | #include <gconv.h> | |
2aea1d79 | 25 | #include <stdint.h> |
04be94a8 UD |
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. */ | |
8619129f UD |
37 | extern const struct jisx0212_idx __jisx0212_to_ucs_idx[]; |
38 | extern const uint16_t __jisx0212_to_ucs[]; | |
04be94a8 | 39 | |
8619129f UD |
40 | extern const struct jisx0212_idx __jisx0212_from_ucs_idx[]; |
41 | extern const char __jisx0212_from_ucs[][2]; | |
04be94a8 UD |
42 | |
43 | ||
44 | static inline wchar_t | |
8619129f | 45 | jisx0212_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
04be94a8 | 46 | { |
8619129f | 47 | const struct jisx0212_idx *rp = __jisx0212_to_ucs_idx; |
04be94a8 UD |
48 | unsigned char ch = *(*s); |
49 | unsigned char ch2; | |
8619129f | 50 | uint32_t wch = 0; |
04be94a8 UD |
51 | int idx; |
52 | ||
2b474353 | 53 | if (ch < offset || (ch - offset) <= 0x6d || (ch - offset) > 0xea) |
04be94a8 UD |
54 | return UNKNOWN_10646_CHAR; |
55 | ||
56 | if (avail < 2) | |
57 | return 0; | |
58 | ||
59 | ch2 = (*s)[1]; | |
2b474353 | 60 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
04be94a8 UD |
61 | return UNKNOWN_10646_CHAR; |
62 | ||
2b474353 | 63 | idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset); |
04be94a8 | 64 | |
8619129f | 65 | while (idx > rp->end) |
04be94a8 | 66 | ++rp; |
8619129f UD |
67 | if (idx >= rp->start) |
68 | wch = __jisx0212_to_ucs[rp->idx + idx - rp->start]; | |
04be94a8 UD |
69 | |
70 | if (wch != L'\0') | |
71 | (*s) += 2; | |
72 | else | |
73 | wch = UNKNOWN_10646_CHAR; | |
74 | ||
75 | return wch; | |
76 | } | |
77 | ||
78 | ||
79 | static inline size_t | |
2b474353 | 80 | ucs4_to_jisx0212 (wchar_t wch, char *s, size_t avail) |
04be94a8 | 81 | { |
8619129f | 82 | const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx; |
04be94a8 | 83 | unsigned int ch = (unsigned int) wch; |
8619129f | 84 | const char *cp; |
04be94a8 | 85 | |
8619129f UD |
86 | if (ch >= 0xffff) |
87 | return UNKNOWN_10646_CHAR; | |
04be94a8 UD |
88 | while (ch > rp->end) |
89 | ++rp; | |
90 | if (ch >= rp->start) | |
8619129f UD |
91 | cp = __jisx0212_from_ucs[rp->idx + ch - rp->start]; |
92 | else | |
93 | return UNKNOWN_10646_CHAR; | |
04be94a8 | 94 | |
8619129f | 95 | if (cp[0] == '\0') |
04be94a8 UD |
96 | return UNKNOWN_10646_CHAR; |
97 | ||
2b474353 | 98 | s[0] = cp[0]; |
04be94a8 UD |
99 | if (cp[1] != '\0') |
100 | { | |
101 | if (avail < 2) | |
102 | return 0; | |
103 | ||
2b474353 | 104 | s[1] = cp[1]; |
04be94a8 | 105 | } |
04be94a8 UD |
106 | |
107 | return 2; | |
108 | } | |
109 | ||
110 | #endif /* jis0212.h */ |