162 lines
5.9 KiB
C
162 lines
5.9 KiB
C
/* Mapping tables from GBK to GB2312 and vice versa.
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <gconv.h>
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#include <stdint.h>
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/* Definitions used in the body of the `gconv' function. */
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#define CHARSET_NAME "GBK//"
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#define FROM_LOOP from_gbk_to_gb
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#define TO_LOOP from_gb_to_gbk
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#define DEFINE_INIT 1
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#define DEFINE_FINI 1
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 2
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#define MIN_NEEDED_TO 1
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#define MAX_NEEDED_TO 2
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/* First define the conversion function from GBK to GB2312. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch = *inptr; \
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\
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if (ch <= 0x7f) \
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*outptr++ = *inptr++; \
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else \
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{ \
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/* It's a two-byte sequence. We have to mask out all the sequences \
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which are not in GB2312. Besides all of them in the range \
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0x8140 to 0xA0FE this also includes in the remaining range the \
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sequences which the second byte being in the range from 0x40 to \
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0xA0 and the following exceptions: \
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\
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0xA2A1 to 0xA2A9, \
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0xA2AA, \
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0xA6E0 to 0xA6EB, \
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0xA6EE to 0xA6F2, \
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0xA6F4, 0xA6F5, \
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0xA8BB to 0xA8C0 \
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\
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All these characters are not defined in GB2312. Besides this \
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there is an incomatibility in the mapping. The Unicode tables \
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say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to \
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U00B7. Similarly, 0xA1AA maps in GB2312 to U2015 while in GBK \
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it maps to U2014. Since we are free to do whatever we want if \
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a mapping is not available we will not flag this as an error \
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but instead map the two positions. But this means that the \
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mapping \
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\
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UCS4 -> GB2312 -> GBK -> UCS4 \
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\
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might not produce identical text. */ \
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if (__builtin_expect (inptr + 1 >= inend, 0)) \
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{ \
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/* The second character is not available. Store \
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the intermediate result. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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if (__builtin_expect (outend - outptr < 2, 0)) \
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{ \
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/* We ran out of space. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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ch = (ch << 8) | inptr[1]; \
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\
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/* Map 0xA844 (U2015 in GBK) to 0xA1AA (U2015 in GB2312). */ \
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if (__builtin_expect (ch == 0xa844, 0)) \
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ch = 0xa1aa; \
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\
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/* Now determine whether the character is valid. */ \
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if (__builtin_expect (ch < 0xa1a1, 0) \
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|| __builtin_expect (ch > 0xf7fe, 0) \
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|| __builtin_expect (inptr[1] < 0xa1, 0) \
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/* Now test the exceptions. */ \
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|| (__builtin_expect (ch >= 0xa2a1, 0) \
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&& __builtin_expect (ch <= 0xa2aa, 0)) \
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|| (__builtin_expect (ch >= 0xa6e0, 0) \
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&& __builtin_expect (ch <= 0xa6f5, 0)) \
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|| (__builtin_expect (ch >= 0xa8bb, 0) \
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&& __builtin_expect (ch <= 0xa8c0, 0))) \
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{ \
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/* One of the characters we cannot map. */ \
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STANDARD_TO_LOOP_ERR_HANDLER (2); \
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} \
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\
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/* Copy the two bytes. */ \
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*outptr++ = *inptr++; \
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*outptr++ = *inptr++; \
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} \
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}
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#define LOOP_NEED_FLAGS
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#include <iconv/loop.c>
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/* Next, define the other direction. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MAX_NEEDED_INPUT MAX_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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/* We don't have to care about characters we cannot map. The only \
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problem are the mapping of 0xA1A4 and 0xA1AA but as explained above \
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we do not do anything special here. */ \
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unsigned char ch = *inptr++; \
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\
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if (ch > 0x7f) \
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{ \
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if (__builtin_expect (inptr + 1 >= inend, 0)) \
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{ \
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/* The second character is not available. Store \
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the intermediate result. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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if (__builtin_expect (outend - outptr < 2, 0)) \
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{ \
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/* We ran out of space. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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*outptr++ = ch; \
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ch = *inptr++; \
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} \
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*outptr++ = ch; \
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}
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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