1 /* 2 * _codecs_hk.c: Codecs collection for encodings from Hong Kong 3 * 4 * Written by Hye-Shik Chang <perky (at) FreeBSD.org> 5 */ 6 7 #define USING_IMPORTED_MAPS 8 9 #include "cjkcodecs.h" 10 #include "mappings_hk.h" 11 12 /* 13 * BIG5HKSCS codec 14 */ 15 16 static const encode_map *big5_encmap = NULL; 17 static const decode_map *big5_decmap = NULL; 18 19 CODEC_INIT(big5hkscs) 20 { 21 static int initialized = 0; 22 23 if (!initialized && IMPORT_MAP(tw, big5, &big5_encmap, &big5_decmap)) 24 return -1; 25 initialized = 1; 26 return 0; 27 } 28 29 /* 30 * There are four possible pair unicode -> big5hkscs maps as in HKSCS 2004: 31 * U+00CA U+0304 -> 8862 (U+00CA alone is mapped to 8866) 32 * U+00CA U+030C -> 8864 33 * U+00EA U+0304 -> 88a3 (U+00EA alone is mapped to 88a7) 34 * U+00EA U+030C -> 88a5 35 * These are handled by not mapping tables but a hand-written code. 36 */ 37 static const DBCHAR big5hkscs_pairenc_table[4] = {0x8862, 0x8864, 0x88a3, 0x88a5}; 38 39 ENCODER(big5hkscs) 40 { 41 while (inleft > 0) { 42 ucs4_t c = **inbuf; 43 DBCHAR code; 44 Py_ssize_t insize; 45 46 if (c < 0x80) { 47 REQUIRE_OUTBUF(1) 48 **outbuf = (unsigned char)c; 49 NEXT(1, 1) 50 continue; 51 } 52 53 DECODE_SURROGATE(c) 54 insize = GET_INSIZE(c); 55 56 REQUIRE_OUTBUF(2) 57 58 if (c < 0x10000) { 59 TRYMAP_ENC(big5hkscs_bmp, code, c) { 60 if (code == MULTIC) { 61 if (inleft >= 2 && 62 ((c & 0xffdf) == 0x00ca) && 63 (((*inbuf)[1] & 0xfff7) == 0x0304)) { 64 code = big5hkscs_pairenc_table[ 65 ((c >> 4) | 66 ((*inbuf)[1] >> 3)) & 3]; 67 insize = 2; 68 } 69 else if (inleft < 2 && 70 !(flags & MBENC_FLUSH)) 71 return MBERR_TOOFEW; 72 else { 73 if (c == 0xca) 74 code = 0x8866; 75 else /* c == 0xea */ 76 code = 0x88a7; 77 } 78 } 79 } 80 else TRYMAP_ENC(big5, code, c); 81 else return 1; 82 } 83 else if (c < 0x20000) 84 return insize; 85 else if (c < 0x30000) { 86 TRYMAP_ENC(big5hkscs_nonbmp, code, c & 0xffff); 87 else return insize; 88 } 89 else 90 return insize; 91 92 OUT1(code >> 8) 93 OUT2(code & 0xFF) 94 NEXT(insize, 2) 95 } 96 97 return 0; 98 } 99 100 #define BH2S(c1, c2) (((c1) - 0x87) * (0xfe - 0x40 + 1) + ((c2) - 0x40)) 101 102 DECODER(big5hkscs) 103 { 104 while (inleft > 0) { 105 unsigned char c = IN1; 106 ucs4_t decoded; 107 108 REQUIRE_OUTBUF(1) 109 110 if (c < 0x80) { 111 OUT1(c) 112 NEXT(1, 1) 113 continue; 114 } 115 116 REQUIRE_INBUF(2) 117 118 if (0xc6 > c || c > 0xc8 || (c < 0xc7 && IN2 < 0xa1)) { 119 TRYMAP_DEC(big5, **outbuf, c, IN2) { 120 NEXT(2, 1) 121 continue; 122 } 123 } 124 125 TRYMAP_DEC(big5hkscs, decoded, c, IN2) 126 { 127 int s = BH2S(c, IN2); 128 const unsigned char *hintbase; 129 130 assert(0x87 <= c && c <= 0xfe); 131 assert(0x40 <= IN2 && IN2 <= 0xfe); 132 133 if (BH2S(0x87, 0x40) <= s && s <= BH2S(0xa0, 0xfe)) { 134 hintbase = big5hkscs_phint_0; 135 s -= BH2S(0x87, 0x40); 136 } 137 else if (BH2S(0xc6,0xa1) <= s && s <= BH2S(0xc8,0xfe)){ 138 hintbase = big5hkscs_phint_12130; 139 s -= BH2S(0xc6, 0xa1); 140 } 141 else if (BH2S(0xf9,0xd6) <= s && s <= BH2S(0xfe,0xfe)){ 142 hintbase = big5hkscs_phint_21924; 143 s -= BH2S(0xf9, 0xd6); 144 } 145 else 146 return MBERR_INTERNAL; 147 148 if (hintbase[s >> 3] & (1 << (s & 7))) { 149 WRITEUCS4(decoded | 0x20000) 150 NEXT_IN(2) 151 } 152 else { 153 OUT1(decoded) 154 NEXT(2, 1) 155 } 156 continue; 157 } 158 159 switch ((c << 8) | IN2) { 160 case 0x8862: WRITE2(0x00ca, 0x0304); break; 161 case 0x8864: WRITE2(0x00ca, 0x030c); break; 162 case 0x88a3: WRITE2(0x00ea, 0x0304); break; 163 case 0x88a5: WRITE2(0x00ea, 0x030c); break; 164 default: return 2; 165 } 166 167 NEXT(2, 2) /* all decoded code points are pairs, above. */ 168 } 169 170 return 0; 171 } 172 173 174 BEGIN_MAPPINGS_LIST 175 MAPPING_DECONLY(big5hkscs) 176 MAPPING_ENCONLY(big5hkscs_bmp) 177 MAPPING_ENCONLY(big5hkscs_nonbmp) 178 END_MAPPINGS_LIST 179 180 BEGIN_CODECS_LIST 181 CODEC_STATELESS_WINIT(big5hkscs) 182 END_CODECS_LIST 183 184 I_AM_A_MODULE_FOR(hk) 185
