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/* Tables for conversion to and from ISO-IR-165.
converting from UCS using gaps.
Copyright (C) 2000-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://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 */
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