/* Tables for conversion to and from ISO-IR-165. converting from UCS using gaps. Copyright (C) 2000, 2003, 2007 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 */