1 /* Mapping tables from GBK to GB2312 and vice versa. 2 Copyright (C) 1999-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <dlfcn.h> 20 #include <gconv.h> 21 #include <stdint.h> 22 23 24 /* Definitions used in the body of the `gconv' function. */ 25 #define CHARSET_NAME "GBK//" 26 #define FROM_LOOP from_gbk_to_gb 27 #define TO_LOOP from_gb_to_gbk 28 #define DEFINE_INIT 1 29 #define DEFINE_FINI 1 30 #define MIN_NEEDED_FROM 1 31 #define MAX_NEEDED_FROM 2 32 #define MIN_NEEDED_TO 1 33 #define MAX_NEEDED_TO 2 34 #define ONE_DIRECTION 0 35 36 37 /* First define the conversion function from GBK to GB2312. */ 38 #define MIN_NEEDED_INPUT MIN_NEEDED_FROM 39 #define MAX_NEEDED_INPUT MAX_NEEDED_FROM 40 #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO 41 #define MAX_NEEDED_OUTPUT MAX_NEEDED_TO 42 #define LOOPFCT FROM_LOOP 43 #define BODY \ 44 { \ 45 uint32_t ch = *inptr; \ 46 \ 47 if (ch <= 0x7f) \ 48 *outptr++ = *inptr++; \ 49 else \ 50 { \ 51 /* It's a two-byte sequence. We have to mask out all the sequences \ 52 which are not in GB2312. Besides all of them in the range \ 53 0x8140 to 0xA0FE this also includes in the remaining range the \ 54 sequences which the second byte being in the range from 0x40 to \ 55 0xA0 and the following exceptions: \ 56 \ 57 0xA2A1 to 0xA2A9, \ 58 0xA2AA, \ 59 0xA6E0 to 0xA6EB, \ 60 0xA6EE to 0xA6F2, \ 61 0xA6F4, 0xA6F5, \ 62 0xA8BB to 0xA8C0 \ 63 \ 64 All these characters are not defined in GB2312. Besides this \ 65 there is an incomatibility in the mapping. The Unicode tables \ 66 say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to \ 67 U00B7. Similarly, 0xA1AA maps in GB2312 to U2015 while in GBK \ 68 it maps to U2014. Since we are free to do whatever we want if \ 69 a mapping is not available we will not flag this as an error \ 70 but instead map the two positions. But this means that the \ 71 mapping \ 72 \ 73 UCS4 -> GB2312 -> GBK -> UCS4 \ 74 \ 75 might not produce identical text. */ \ 76 if (__glibc_unlikely (inptr + 1 >= inend)) \ 77 { \ 78 /* The second character is not available. Store \ 79 the intermediate result. */ \ 80 result = __GCONV_INCOMPLETE_INPUT; \ 81 break; \ 82 } \ 83 \ 84 if (__glibc_unlikely (outend - outptr < 2)) \ 85 { \ 86 /* We ran out of space. */ \ 87 result = __GCONV_FULL_OUTPUT; \ 88 break; \ 89 } \ 90 \ 91 ch = (ch << 8) | inptr[1]; \ 92 \ 93 /* Map 0xA844 (U2015 in GBK) to 0xA1AA (U2015 in GB2312). */ \ 94 if (__glibc_unlikely (ch == 0xa844)) \ 95 ch = 0xa1aa; \ 96 \ 97 /* Now determine whether the character is valid. */ \ 98 if (__builtin_expect (ch < 0xa1a1, 0) \ 99 || __builtin_expect (ch > 0xf7fe, 0) \ 100 || __builtin_expect (inptr[1] < 0xa1, 0) \ 101 /* Now test the exceptions. */ \ 102 || (__builtin_expect (ch >= 0xa2a1, 0) \ 103 && __builtin_expect (ch <= 0xa2aa, 0)) \ 104 || (__builtin_expect (ch >= 0xa6e0, 0) \ 105 && __builtin_expect (ch <= 0xa6f5, 0)) \ 106 || (__builtin_expect (ch >= 0xa8bb, 0) \ 107 && __builtin_expect (ch <= 0xa8c0, 0))) \ 108 { \ 109 /* One of the characters we cannot map. */ \ 110 STANDARD_TO_LOOP_ERR_HANDLER (2); \ 111 } \ 112 \ 113 /* Copy the two bytes. */ \ 114 *outptr++ = *inptr++; \ 115 *outptr++ = *inptr++; \ 116 } \ 117 } 118 #define LOOP_NEED_FLAGS 119 #include <iconv/loop.c> 120 121 122 /* Next, define the other direction. */ 123 #define MIN_NEEDED_INPUT MIN_NEEDED_TO 124 #define MAX_NEEDED_INPUT MAX_NEEDED_TO 125 #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM 126 #define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM 127 #define LOOPFCT TO_LOOP 128 #define BODY \ 129 { \ 130 /* We don't have to care about characters we cannot map. The only \ 131 problem are the mapping of 0xA1A4 and 0xA1AA but as explained above \ 132 we do not do anything special here. */ \ 133 unsigned char ch = *inptr++; \ 134 \ 135 if (ch > 0x7f) \ 136 { \ 137 if (__glibc_unlikely (inptr + 1 >= inend)) \ 138 { \ 139 /* The second character is not available. Store \ 140 the intermediate result. */ \ 141 result = __GCONV_INCOMPLETE_INPUT; \ 142 break; \ 143 } \ 144 \ 145 if (__glibc_unlikely (outend - outptr < 2)) \ 146 { \ 147 /* We ran out of space. */ \ 148 result = __GCONV_FULL_OUTPUT; \ 149 break; \ 150 } \ 151 \ 152 *outptr++ = ch; \ 153 ch = *inptr++; \ 154 } \ 155 *outptr++ = ch; \ 156 } 157 #include <iconv/loop.c> 158 159 160 /* Now define the toplevel functions. */ 161 #include <iconv/skeleton.c> 162