diff options
Diffstat (limited to 'REORG.TODO/iconvdata/iso-ir-165.h')
-rw-r--r-- | REORG.TODO/iconvdata/iso-ir-165.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/REORG.TODO/iconvdata/iso-ir-165.h b/REORG.TODO/iconvdata/iso-ir-165.h new file mode 100644 index 0000000000..7e732a2ea2 --- /dev/null +++ b/REORG.TODO/iconvdata/iso-ir-165.h @@ -0,0 +1,106 @@ +/* Tables for conversion to and from ISO-IR-165. + converting from UCS using gaps. + Copyright (C) 2000-2017 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 */ |