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232 lines
5.2 KiB
C
232 lines
5.2 KiB
C
/* Access functions for GB2312 conversion.
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Copyright (C) 1998, 1999, 2003 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>, 1998.
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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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#ifndef _GB2312_H
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#define _GB2312_H 1
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#include <gconv.h>
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#include <stdint.h>
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#include <assert.h>
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/* Conversion table. */
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extern const uint16_t __gb2312_to_ucs[];
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static inline uint32_t
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__attribute ((always_inline))
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gb2312_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
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{
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unsigned char ch = *(*s);
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unsigned char ch2;
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int idx;
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if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x77)
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return __UNKNOWN_10646_CHAR;
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if (avail < 2)
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return 0;
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ch2 = (*s)[1];
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if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
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return __UNKNOWN_10646_CHAR;
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idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
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if (idx > 0x1ff1)
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return __UNKNOWN_10646_CHAR;
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(*s) += 2;
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return __gb2312_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
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}
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extern const char __gb2312_from_ucs4_tab1[][2];
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extern const char __gb2312_from_ucs4_tab2[][2];
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extern const char __gb2312_from_ucs4_tab3[][2];
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extern const char __gb2312_from_ucs4_tab4[][2];
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extern const char __gb2312_from_ucs4_tab5[][2];
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extern const char __gb2312_from_ucs4_tab6[][2];
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extern const char __gb2312_from_ucs4_tab7[][2];
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extern const char __gb2312_from_ucs4_tab8[][2];
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extern const char __gb2312_from_ucs4_tab9[][2];
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_gb2312 (uint32_t wch, unsigned char *s, size_t avail)
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{
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unsigned int ch = (unsigned int) wch;
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char buf[2];
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const char *cp = buf;
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switch (ch)
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{
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case 0xa4 ... 0x101:
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cp = __gb2312_from_ucs4_tab1[ch - 0xa4];
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break;
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case 0x113:
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cp = "\x28\x25";
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break;
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case 0x11b:
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cp = "\x28\x27";
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break;
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case 0x12b:
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cp = "\x28\x29";
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break;
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case 0x14d:
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cp = "\x28\x2d";
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break;
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case 0x16b:
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cp = "\x28\x31";
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break;
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case 0x1ce:
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cp = "\x28\x23";
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break;
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case 0x1d0:
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cp = "\x28\x2b";
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break;
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case 0x1d2:
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cp = "\x28\x2f";
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break;
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case 0x1d4:
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cp = "\x28\x33";
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break;
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case 0x1d6:
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cp = "\x28\x35";
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break;
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case 0x1d8:
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cp = "\x28\x36";
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break;
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case 0x1da:
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cp = "\x28\x37";
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break;
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case 0x1dc:
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cp = "\x28\x38";
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break;
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case 0x2c7:
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cp = "\x21\x26";
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break;
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case 0x2c9:
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cp = "\x21\x25";
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break;
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case 0x391 ... 0x3c9:
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cp = __gb2312_from_ucs4_tab2[ch - 0x391];
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break;
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case 0x401 ... 0x451:
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cp = __gb2312_from_ucs4_tab3[ch - 0x401];
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break;
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case 0x2015 ... 0x203b:
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cp = __gb2312_from_ucs4_tab4[ch - 0x2015];
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break;
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case 0x2103 ... 0x22a5:
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cp = __gb2312_from_ucs4_tab5[ch - 0x2103];
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break;
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case 0x2312:
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cp = "\x21\x50";
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break;
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case 0x2460 ... 0x249b:
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cp = __gb2312_from_ucs4_tab6[ch - 0x2460];
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break;
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case 0x2500 ... 0x254b:
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buf[0] = '\x29';
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buf[1] = '\x24' + (ch % 256);
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break;
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case 0x25a0:
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cp = "\x21\x76";
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break;
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case 0x25a1:
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cp = "\x21\x75";
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break;
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case 0x25b2:
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cp = "\x21\x78";
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break;
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case 0x25b3:
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cp = "\x21\x77";
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break;
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case 0x25c6:
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cp = "\x21\x74";
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break;
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case 0x25c7:
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cp = "\x21\x73";
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break;
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case 0x25cb:
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cp = "\x21\x70";
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break;
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case 0x25ce:
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cp = "\x21\x72";
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break;
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case 0x25cf:
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cp = "\x21\x71";
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break;
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case 0x2605:
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cp = "\x21\x6f";
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break;
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case 0x2606:
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cp = "\x21\x6e";
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break;
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case 0x2640:
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cp = "\x21\x62";
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break;
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case 0x2642:
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cp = "\x21\x61";
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break;
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case 0x3000 ... 0x3129:
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cp = __gb2312_from_ucs4_tab7[ch - 0x3000];
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break;
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case 0x3220 ... 0x3229:
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buf[0] = '\x22';
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buf[1] = '\x65' + (ch - 0x3220);
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break;
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case 0x4e00 ... 0x9fa0:
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cp = __gb2312_from_ucs4_tab8[ch - 0x4e00];
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break;
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case 0xff01 ... 0xff5e:
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cp = __gb2312_from_ucs4_tab9[ch - 0xff01];
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break;
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case 0xffe0:
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cp = "\x21\x69";
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break;
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case 0xffe1:
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cp = "\x21\x6a";
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break;
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case 0xffe3:
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cp = "\x23\x7e";
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break;
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case 0xffe5:
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cp = "\x23\x24";
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break;
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default:
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return __UNKNOWN_10646_CHAR;
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}
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if (cp[0] == '\0')
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return __UNKNOWN_10646_CHAR;
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assert (cp[1] != '\0');
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if (avail < 2)
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return 0;
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s[0] = cp[0];
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s[1] = cp[1];
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return 2;
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}
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#endif /* gb2312.h */
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