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c456edaa UD |
1 | /* Tables for conversion to and from ISO-IR-165. |
2 | converting from UCS using gaps. | |
bfff8b1b | 3 | Copyright (C) 2000-2017 Free Software Foundation, Inc. |
c456edaa UD |
4 | This file is part of the GNU C Library. |
5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
c456edaa UD |
11 | |
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 15 | Lesser General Public License for more details. |
c456edaa | 16 | |
41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
c456edaa UD |
20 | |
21 | #ifndef _ISO_IR_165_H | |
22 | #define _ISO_IR_165_H 1 | |
23 | ||
24 | #include <gconv.h> | |
25 | #include <stdint.h> | |
26 | ||
27 | struct gap | |
28 | { | |
29 | uint16_t start; | |
30 | uint16_t end; | |
31 | int32_t idx; | |
32 | }; | |
33 | ||
34 | /* Table for ISO-IR-165 (CCITT Chinese) to UCS4 conversion. */ | |
35 | #define ISOIR165_FROMSIZE 0x2284 | |
36 | extern const uint16_t __isoir165_to_tab[ISOIR165_FROMSIZE]; | |
37 | ||
38 | ||
39 | /* XXX If we at some point need an offset value to decode the byte | |
40 | sequences another parameter can be added. */ | |
41 | static inline uint32_t | |
25337753 | 42 | __attribute ((always_inline)) |
c0d99958 | 43 | isoir165_to_ucs4 (const unsigned char **s, size_t avail) |
c456edaa UD |
44 | { |
45 | unsigned char ch = *(*s); | |
46 | unsigned char ch2; | |
c0d99958 | 47 | uint32_t res; |
c456edaa UD |
48 | |
49 | if (ch <= 0x20 || ch >= 0x7f) | |
50 | return __UNKNOWN_10646_CHAR; | |
51 | ||
52 | if (avail < 2) | |
53 | return 0; | |
54 | ||
55 | ch2 = (*s)[1]; | |
56 | if (ch2 <= 0x20 || ch2 >= 0x7f) | |
57 | return __UNKNOWN_10646_CHAR; | |
58 | ||
c0d99958 UD |
59 | res = __isoir165_to_tab[(ch - 0x21) * 94 + (ch2 - 0x21)]; |
60 | if (res == 0) | |
61 | return __UNKNOWN_10646_CHAR; | |
62 | ||
63 | *s += 2; | |
64 | return res; | |
c456edaa UD |
65 | } |
66 | ||
67 | ||
68 | /* Tables for ISO-IR-165 (CCITT Chinese) from UCS4 conversion. */ | |
69 | extern const struct gap __isoir165_from_idx[]; | |
70 | extern const char __isoir165_from_tab[]; | |
71 | ||
72 | static inline size_t | |
25337753 | 73 | __attribute ((always_inline)) |
085a4412 | 74 | ucs4_to_isoir165 (uint32_t wch, unsigned char *s, size_t avail) |
c456edaa UD |
75 | { |
76 | unsigned int ch = (unsigned int) wch; | |
77 | const char *cp; | |
78 | const struct gap *rp = __isoir165_from_idx; | |
79 | ||
80 | if (ch > 0xffe5) | |
81 | /* This is an illegal character. */ | |
82 | return __UNKNOWN_10646_CHAR; | |
83 | ||
84 | while (ch > rp->end) | |
85 | ++rp; | |
86 | if (ch < rp->start) | |
87 | /* This is an illegal character. */ | |
88 | return __UNKNOWN_10646_CHAR; | |
89 | ||
90 | /* The two bytes following the index given in this record give the | |
91 | encoding in ISO-IR-165. Unless the bytes are zero. */ | |
92 | cp = &__isoir165_from_tab[(ch + rp->idx) * 2]; | |
93 | if (*cp == '\0') | |
94 | /* This is an illegal character. */ | |
95 | return __UNKNOWN_10646_CHAR; | |
96 | ||
97 | if (avail < 2) | |
98 | return 0; | |
99 | ||
100 | s[0] = cp[0]; | |
101 | s[1] = cp[1]; | |
102 | ||
103 | return 2; | |
104 | } | |
105 | ||
106 | #endif /* iso-ir-165.h */ |