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/* Access functions for GB2312 conversion.
Copyright (C) 1998-2023 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 _GB2312_H
#define _GB2312_H 1
#include <gconv.h>
#include <stdint.h>
#include <assert.h>
/* Conversion table. */
extern const uint16_t __gb2312_to_ucs[];
static inline uint32_t
__attribute ((always_inline))
gb2312_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
{
unsigned char ch = *(*s);
unsigned char ch2;
int idx;
if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x77)
return __UNKNOWN_10646_CHAR;
if (avail < 2)
return 0;
ch2 = (*s)[1];
if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
return __UNKNOWN_10646_CHAR;
idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
if (idx > 0x1ff1)
return __UNKNOWN_10646_CHAR;
(*s) += 2;
return __gb2312_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
}
extern const char __gb2312_from_ucs4_tab1[][2];
extern const char __gb2312_from_ucs4_tab2[][2];
extern const char __gb2312_from_ucs4_tab3[][2];
extern const char __gb2312_from_ucs4_tab4[][2];
extern const char __gb2312_from_ucs4_tab5[][2];
extern const char __gb2312_from_ucs4_tab6[][2];
extern const char __gb2312_from_ucs4_tab7[][2];
extern const char __gb2312_from_ucs4_tab8[][2];
extern const char __gb2312_from_ucs4_tab9[][2];
static inline size_t
__attribute ((always_inline))
ucs4_to_gb2312 (uint32_t wch, unsigned char *s, size_t avail)
{
unsigned int ch = (unsigned int) wch;
char buf[2];
const char *cp = buf;
switch (ch)
{
case 0xa4 ... 0x101:
cp = __gb2312_from_ucs4_tab1[ch - 0xa4];
break;
case 0x113:
cp = "\x28\x25";
break;
case 0x11b:
cp = "\x28\x27";
break;
case 0x12b:
cp = "\x28\x29";
break;
case 0x14d:
cp = "\x28\x2d";
break;
case 0x16b:
cp = "\x28\x31";
break;
case 0x1ce:
cp = "\x28\x23";
break;
case 0x1d0:
cp = "\x28\x2b";
break;
case 0x1d2:
cp = "\x28\x2f";
break;
case 0x1d4:
cp = "\x28\x33";
break;
case 0x1d6:
cp = "\x28\x35";
break;
case 0x1d8:
cp = "\x28\x36";
break;
case 0x1da:
cp = "\x28\x37";
break;
case 0x1dc:
cp = "\x28\x38";
break;
case 0x2c7:
cp = "\x21\x26";
break;
case 0x2c9:
cp = "\x21\x25";
break;
case 0x391 ... 0x3c9:
cp = __gb2312_from_ucs4_tab2[ch - 0x391];
break;
case 0x401 ... 0x451:
cp = __gb2312_from_ucs4_tab3[ch - 0x401];
break;
case 0x2015 ... 0x203b:
cp = __gb2312_from_ucs4_tab4[ch - 0x2015];
break;
case 0x2103 ... 0x22a5:
cp = __gb2312_from_ucs4_tab5[ch - 0x2103];
break;
case 0x2312:
cp = "\x21\x50";
break;
case 0x2460 ... 0x249b:
cp = __gb2312_from_ucs4_tab6[ch - 0x2460];
break;
case 0x2500 ... 0x254b:
buf[0] = '\x29';
buf[1] = '\x24' + (ch % 256);
break;
case 0x25a0:
cp = "\x21\x76";
break;
case 0x25a1:
cp = "\x21\x75";
break;
case 0x25b2:
cp = "\x21\x78";
break;
case 0x25b3:
cp = "\x21\x77";
break;
case 0x25c6:
cp = "\x21\x74";
break;
case 0x25c7:
cp = "\x21\x73";
break;
case 0x25cb:
cp = "\x21\x70";
break;
case 0x25ce:
cp = "\x21\x72";
break;
case 0x25cf:
cp = "\x21\x71";
break;
case 0x2605:
cp = "\x21\x6f";
break;
case 0x2606:
cp = "\x21\x6e";
break;
case 0x2640:
cp = "\x21\x62";
break;
case 0x2642:
cp = "\x21\x61";
break;
case 0x3000 ... 0x3129:
cp = __gb2312_from_ucs4_tab7[ch - 0x3000];
break;
case 0x3220 ... 0x3229:
buf[0] = '\x22';
buf[1] = '\x65' + (ch - 0x3220);
break;
case 0x4e00 ... 0x9fa0:
cp = __gb2312_from_ucs4_tab8[ch - 0x4e00];
break;
case 0xff01 ... 0xff5e:
cp = __gb2312_from_ucs4_tab9[ch - 0xff01];
break;
case 0xffe0:
cp = "\x21\x69";
break;
case 0xffe1:
cp = "\x21\x6a";
break;
case 0xffe3:
cp = "\x23\x7e";
break;
case 0xffe5:
cp = "\x23\x24";
break;
default:
return __UNKNOWN_10646_CHAR;
}
if (cp[0] == '\0')
return __UNKNOWN_10646_CHAR;
assert (cp[1] != '\0');
if (avail < 2)
return 0;
s[0] = cp[0];
s[1] = cp[1];
return 2;
}
#endif /* gb2312.h */
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