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glibc/iconvdata/iso-ir-165.h
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/* 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#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 */ |