| /* Tables for conversion to and from ISO-IR-165. |
| converting from UCS using gaps. |
| Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _ISO_IR_165_H |
| #define _ISO_IR_165_H 1 |
| |
| #include <gconv.h> |
| #include <stdint.h> |
| |
| struct gap |
| { |
| uint16_t start; |
| uint16_t end; |
| int32_t idx; |
| }; |
| |
| /* Table for ISO-IR-165 (CCITT Chinese) to UCS4 conversion. */ |
| #define ISOIR165_FROMSIZE 0x2284 |
| extern const uint16_t __isoir165_to_tab[ISOIR165_FROMSIZE]; |
| |
| |
| /* XXX If we at some point need an offset value to decode the byte |
| sequences another parameter can be added. */ |
| static inline uint32_t |
| __attribute ((always_inline)) |
| isoir165_to_ucs4 (const unsigned char **s, size_t avail) |
| { |
| unsigned char ch = *(*s); |
| unsigned char ch2; |
| uint32_t res; |
| |
| if (ch <= 0x20 || ch >= 0x7f) |
| return __UNKNOWN_10646_CHAR; |
| |
| if (avail < 2) |
| return 0; |
| |
| ch2 = (*s)[1]; |
| if (ch2 <= 0x20 || ch2 >= 0x7f) |
| return __UNKNOWN_10646_CHAR; |
| |
| res = __isoir165_to_tab[(ch - 0x21) * 94 + (ch2 - 0x21)]; |
| if (res == 0) |
| return __UNKNOWN_10646_CHAR; |
| |
| *s += 2; |
| return res; |
| } |
| |
| |
| /* Tables for ISO-IR-165 (CCITT Chinese) from UCS4 conversion. */ |
| extern const struct gap __isoir165_from_idx[]; |
| extern const char __isoir165_from_tab[]; |
| |
| static inline size_t |
| __attribute ((always_inline)) |
| ucs4_to_isoir165 (uint32_t wch, unsigned char *s, size_t avail) |
| { |
| unsigned int ch = (unsigned int) wch; |
| const char *cp; |
| const struct gap *rp = __isoir165_from_idx; |
| |
| if (ch > 0xffe5) |
| /* This is an illegal character. */ |
| return __UNKNOWN_10646_CHAR; |
| |
| while (ch > rp->end) |
| ++rp; |
| if (ch < rp->start) |
| /* This is an illegal character. */ |
| return __UNKNOWN_10646_CHAR; |
| |
| /* The two bytes following the index given in this record give the |
| encoding in ISO-IR-165. Unless the bytes are zero. */ |
| cp = &__isoir165_from_tab[(ch + rp->idx) * 2]; |
| if (*cp == '\0') |
| /* This is an illegal character. */ |
| return __UNKNOWN_10646_CHAR; |
| |
| if (avail < 2) |
| return 0; |
| |
| s[0] = cp[0]; |
| s[1] = cp[1]; |
| |
| return 2; |
| } |
| |
| #endif /* iso-ir-165.h */ |
