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/* Mapping tables from GBK to GB2312 and vice versa.
Copyright (C) 1999-2023 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/>. */
#include <dlfcn.h>
#include <gconv.h>
#include <stdint.h>
/* Definitions used in the body of the `gconv' function. */
#define CHARSET_NAME "GBK//"
#define FROM_LOOP from_gbk_to_gb
#define TO_LOOP from_gb_to_gbk
#define DEFINE_INIT 1
#define DEFINE_FINI 1
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 2
#define MIN_NEEDED_TO 1
#define MAX_NEEDED_TO 2
#define ONE_DIRECTION 0
/* First define the conversion function from GBK to GB2312. */
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t ch = *inptr; \
\
if (ch <= 0x7f) \
*outptr++ = *inptr++; \
else \
{ \
/* It's a two-byte sequence. We have to mask out all the sequences \
which are not in GB2312. Besides all of them in the range \
0x8140 to 0xA0FE this also includes in the remaining range the \
sequences which the second byte being in the range from 0x40 to \
0xA0 and the following exceptions: \
\
0xA2A1 to 0xA2A9, \
0xA2AA, \
0xA6E0 to 0xA6EB, \
0xA6EE to 0xA6F2, \
0xA6F4, 0xA6F5, \
0xA8BB to 0xA8C0 \
\
All these characters are not defined in GB2312. Besides this \
there is an incomatibility in the mapping. The Unicode tables \
say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to \
U00B7. Similarly, 0xA1AA maps in GB2312 to U2015 while in GBK \
it maps to U2014. Since we are free to do whatever we want if \
a mapping is not available we will not flag this as an error \
but instead map the two positions. But this means that the \
mapping \
\
UCS4 -> GB2312 -> GBK -> UCS4 \
\
might not produce identical text. */ \
if (__glibc_unlikely (inptr + 1 >= inend)) \
{ \
/* The second character is not available. Store \
the intermediate result. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
if (__glibc_unlikely (outend - outptr < 2)) \
{ \
/* We ran out of space. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
ch = (ch << 8) | inptr[1]; \
\
/* Map 0xA844 (U2015 in GBK) to 0xA1AA (U2015 in GB2312). */ \
if (__glibc_unlikely (ch == 0xa844)) \
ch = 0xa1aa; \
\
/* Now determine whether the character is valid. */ \
if (__builtin_expect (ch < 0xa1a1, 0) \
|| __builtin_expect (ch > 0xf7fe, 0) \
|| __builtin_expect (inptr[1] < 0xa1, 0) \
/* Now test the exceptions. */ \
|| (__builtin_expect (ch >= 0xa2a1, 0) \
&& __builtin_expect (ch <= 0xa2aa, 0)) \
|| (__builtin_expect (ch >= 0xa6e0, 0) \
&& __builtin_expect (ch <= 0xa6f5, 0)) \
|| (__builtin_expect (ch >= 0xa8bb, 0) \
&& __builtin_expect (ch <= 0xa8c0, 0))) \
{ \
/* One of the characters we cannot map. */ \
STANDARD_TO_LOOP_ERR_HANDLER (2); \
} \
\
/* Copy the two bytes. */ \
*outptr++ = *inptr++; \
*outptr++ = *inptr++; \
} \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
/* Next, define the other direction. */
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MAX_NEEDED_INPUT MAX_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
#define LOOPFCT TO_LOOP
#define BODY \
{ \
/* We don't have to care about characters we cannot map. The only \
problem are the mapping of 0xA1A4 and 0xA1AA but as explained above \
we do not do anything special here. */ \
unsigned char ch = *inptr++; \
\
if (ch > 0x7f) \
{ \
if (__glibc_unlikely (inptr + 1 >= inend)) \
{ \
/* The second character is not available. Store \
the intermediate result. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
if (__glibc_unlikely (outend - outptr < 2)) \
{ \
/* We ran out of space. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*outptr++ = ch; \
ch = *inptr++; \
} \
*outptr++ = ch; \
}
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
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