1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 2000-2013, International Business Machines 5 * Corporation and others. All Rights Reserved. 6 * 7 ****************************************************************************** 8 * file name: ucnvmbcs.h 9 * encoding: US-ASCII 10 * tab size: 8 (not used) 11 * indentation:4 12 * 13 * created on: 2000jul07 14 * created by: Markus W. Scherer 15 */ 16 17 #ifndef __UCNVMBCS_H__ 18 #define __UCNVMBCS_H__ 19 20 #include "unicode/utypes.h" 21 22 #if !UCONFIG_NO_CONVERSION 23 24 #include "unicode/ucnv.h" 25 #include "ucnv_cnv.h" 26 #include "ucnv_ext.h" 27 28 /** 29 * ICU conversion (.cnv) data file structure, following the usual UDataInfo 30 * header. 31 * 32 * Format version: 6.2 33 * 34 * struct UConverterStaticData -- struct containing the converter name, IBM CCSID, 35 * min/max bytes per character, etc. 36 * see ucnv_bld.h 37 * 38 * -------------------- 39 * 40 * The static data is followed by conversionType-specific data structures. 41 * At the moment, there are only variations of MBCS converters. They all have 42 * the same toUnicode structures, while the fromUnicode structures for SBCS 43 * differ from those for other MBCS-style converters. 44 * 45 * _MBCSHeader.version 5 is optional and not backward-compatible 46 * (as usual for changes in the major version field). 47 * 48 * Versions 5.m work like versions 4.m except: 49 * - The _MBCSHeader has variable length (and is always longer than in version 4). 50 * See the struct _MBCSHeader further description below. 51 * - There is a set of flags which indicate further incompatible changes. 52 * (Reader code must reject the file if it does not recognize them all.) 53 * - In particular, one of these flags indicates that most of the fromUnicode 54 * data is missing and must be reconstituted from the toUnicode data 55 * and from the utf8Friendly mbcsIndex at load time. 56 * (This only works with a utf8Friendly table.) 57 * In this case, makeconv may increase maxFastUChar automatically to U+FFFF. 58 * 59 * The first of these versions is 5.3, which is like 4.3 except for the differences above. 60 * 61 * When possible, makeconv continues to generate version 4.m files. 62 * 63 * _MBCSHeader.version 5.4/4.4 supports "good one-way" mappings (|4) 64 * in the extension tables (fromUTableValues bit 30). See ucnv_ext.h for details. 65 * 66 * _MBCSHeader.version 4.3 optionally modifies the fromUnicode data structures 67 * slightly and optionally adds a table for conversion to MBCS (non-SBCS) 68 * charsets. 69 * 70 * The modifications are to make the data utf8Friendly. Not every 4.3 file 71 * file contains utf8Friendly data. 72 * It is utf8Friendly if _MBCSHeader.version[2]!=0. 73 * In this case, the data structures are utf8Friendly up to the code point 74 * maxFastUChar=((_MBCSHeader.version[2]<<8)|0xff) 75 * 76 * A utf8Friendly file has fromUnicode stage 3 entries for code points up to 77 * maxFastUChar allocated in blocks of 64 for indexing with the 6 bits from 78 * a UTF-8 trail byte. ASCII is allocated linearly with 128 contiguous entries. 79 * 80 * In addition, a utf8Friendly MBCS file contains an additional 81 * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; 82 * which replaces the stage 1 and 2 tables for indexing with bits from the 83 * UTF-8 lead byte and middle trail byte. Unlike the older MBCS stage 2 table, 84 * the mbcsIndex does not contain roundtrip flags. Therefore, all fallbacks 85 * from code points up to maxFastUChar (and roundtrips to 0x00) are moved to 86 * the extension data structure. This also allows for faster roundtrip 87 * conversion from UTF-16. 88 * 89 * SBCS files do not contain an additional sbcsIndex[] array because the 90 * proportional size increase would be noticeable, but the runtime 91 * code builds one for the code point range for which the runtime conversion 92 * code is optimized. 93 * 94 * For SBCS, maxFastUChar should be at least U+0FFF. The initial makeconv 95 * implementation sets it to U+1FFF. Because the sbcsIndex is not stored in 96 * the file, a larger maxFastUChar only affects stage 3 block allocation size 97 * and is free in empty blocks. (Larger blocks with sparse contents cause larger 98 * files.) U+1FFF includes almost all of the small scripts. 99 * U+0FFF covers UTF-8 two-byte sequences and three-byte sequences starting with 100 * 0xe0. This includes most scripts with legacy SBCS charsets. 101 * The initial runtime implementation using 4.3 files only builds an sbcsIndex 102 * for code points up to U+0FFF. 103 * 104 * For MBCS, maxFastUChar should be at least U+D7FF (=initial value). 105 * This boundary is convenient because practically all of the commonly used 106 * characters are below it, and because it is the boundary to surrogate 107 * code points, above which special handling is necessary anyway. 108 * (Surrogate pair assembly for UTF-16, validity checking for UTF-8.) 109 * 110 * maxFastUChar could be up to U+FFFF to cover the whole BMP, which could be 111 * useful especially for conversion from UTF-8 when the input can be assumed 112 * to be valid, because the surrogate range would then not have to be 113 * checked. 114 * (With maxFastUChar=0xffff, makeconv would have to check for mbcsIndex value 115 * overflow because with the all-unassigned block 0 and nearly full mappings 116 * from the BMP it is theoretically possible that an index into stage 3 117 * exceeds 16 bits.) 118 * 119 * _MBCSHeader.version 4.2 adds an optional conversion extension data structure. 120 * If it is present, then an ICU version reading header versions 4.0 or 4.1 121 * will be able to use the base table and ignore the extension. 122 * 123 * The unicodeMask in the static data is part of the base table data structure. 124 * Especially, the UCNV_HAS_SUPPLEMENTARY flag determines the length of the 125 * fromUnicode stage 1 array. 126 * The static data unicodeMask refers only to the base table's properties if 127 * a base table is included. 128 * In an extension-only file, the static data unicodeMask is 0. 129 * The extension data indexes have a separate field with the unicodeMask flags. 130 * 131 * MBCS-style data structure following the static data. 132 * Offsets are counted in bytes from the beginning of the MBCS header structure. 133 * Details about usage in comments in ucnvmbcs.c. 134 * 135 * struct _MBCSHeader (see the definition in this header file below) 136 * contains 32-bit fields as follows: 137 * 8 values: 138 * 0 uint8_t[4] MBCS version in UVersionInfo format (currently 4.3.x.0) 139 * 1 uint32_t countStates 140 * 2 uint32_t countToUFallbacks 141 * 3 uint32_t offsetToUCodeUnits 142 * 4 uint32_t offsetFromUTable 143 * 5 uint32_t offsetFromUBytes 144 * 6 uint32_t flags, bits: 145 * 31.. 8 offsetExtension -- _MBCSHeader.version 4.2 (ICU 2.8) and higher 146 * 0 for older versions and if 147 * there is not extension structure 148 * 7.. 0 outputType 149 * 7 uint32_t fromUBytesLength -- _MBCSHeader.version 4.1 (ICU 2.4) and higher 150 * counts bytes in fromUBytes[] 151 * 152 * New and required in version 5: 153 * 8 uint32_t options, bits: 154 * 31..16 reserved for flags that can be added without breaking 155 * backward compatibility 156 * 15.. 6 reserved for flags whose addition will break 157 * backward compatibility 158 * 6 MBCS_OPT_FROM_U -- if set, 159 * then most of the fromUnicode data is omitted; 160 * fullStage2Length is present and the missing 161 * bottom part of stage 2 must be reconstituted from 162 * the toUnicode data; 163 * stage 3 is missing completely as well; 164 * not used for SBCS tables 165 * 5.. 0 length of the _MBCSHeader (number of uint32_t) 166 * 167 * New and optional in version 5: 168 * 9 uint32_t fullStage2Length: used if MBCS_OPT_FROM_U is set 169 * specifies the full length of stage 2 170 * including the omitted part 171 * 172 * if(outputType==MBCS_OUTPUT_EXT_ONLY) { 173 * -- base table name for extension-only table 174 * char baseTableName[variable]; -- with NUL plus padding for 4-alignment 175 * 176 * -- all _MBCSHeader fields except for version and flags are 0 177 * } else { 178 * -- normal base table with optional extension 179 * 180 * int32_t stateTable[countStates][256]; 181 * 182 * struct _MBCSToUFallback { (fallbacks are sorted by offset) 183 * uint32_t offset; 184 * UChar32 codePoint; 185 * } toUFallbacks[countToUFallbacks]; 186 * 187 * uint16_t unicodeCodeUnits[(offsetFromUTable-offsetToUCodeUnits)/2]; 188 * (padded to an even number of units) 189 * 190 * -- stage 1 tables 191 * if(staticData.unicodeMask&UCNV_HAS_SUPPLEMENTARY) { 192 * -- stage 1 table for all of Unicode 193 * uint16_t fromUTable[0x440]; (32-bit-aligned) 194 * } else { 195 * -- BMP-only tables have a smaller stage 1 table 196 * uint16_t fromUTable[0x40]; (32-bit-aligned) 197 * } 198 * 199 * -- stage 2 tables 200 * length determined by top of stage 1 and bottom of stage 3 tables 201 * if(outputType==MBCS_OUTPUT_1) { 202 * -- SBCS: pure indexes 203 * uint16_t stage 2 indexes[?]; 204 * } else { 205 * -- DBCS, MBCS, EBCDIC_STATEFUL, ...: roundtrip flags and indexes 206 * uint32_t stage 2 flags and indexes[?]; 207 * if(options&MBCS_OPT_NO_FROM_U) { 208 * stage 2 really has length fullStage2Length 209 * and the omitted lower part must be reconstituted from 210 * the toUnicode data 211 * } 212 * } 213 * 214 * -- stage 3 tables with byte results 215 * if(outputType==MBCS_OUTPUT_1) { 216 * -- SBCS: each 16-bit result contains flags and the result byte, see ucnvmbcs.c 217 * uint16_t fromUBytes[fromUBytesLength/2]; 218 * } else if(!(options&MBCS_OPT_NO_FROM_U)) { 219 * -- DBCS, MBCS, EBCDIC_STATEFUL, ... 2/3/4 bytes result, see ucnvmbcs.c 220 * uint8_t fromUBytes[fromUBytesLength]; or 221 * uint16_t fromUBytes[fromUBytesLength/2]; or 222 * uint32_t fromUBytes[fromUBytesLength/4]; 223 * } else { 224 * fromUBytes[] must be reconstituted from the toUnicode data 225 * } 226 * 227 * -- optional utf8Friendly mbcsIndex -- _MBCSHeader.version 4.3 (ICU 3.8) and higher 228 * if(outputType!=MBCS_OUTPUT_1 && 229 * _MBCSHeader.version[1]>=3 && 230 * (maxFastUChar=_MBCSHeader.version[2])!=0 231 * ) { 232 * maxFastUChar=(maxFastUChar<<8)|0xff; 233 * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; 234 * } 235 * } 236 * 237 * -- extension table, details see ucnv_ext.h 238 * int32_t indexes[>=32]; ... 239 */ 240 241 /* MBCS converter data and state -------------------------------------------- */ 242 243 enum { 244 MBCS_MAX_STATE_COUNT=128 245 }; 246 247 /** 248 * MBCS action codes for conversions to Unicode. 249 * These values are in bits 23..20 of the state table entries. 250 */ 251 enum { 252 MBCS_STATE_VALID_DIRECT_16, 253 MBCS_STATE_VALID_DIRECT_20, 254 255 MBCS_STATE_FALLBACK_DIRECT_16, 256 MBCS_STATE_FALLBACK_DIRECT_20, 257 258 MBCS_STATE_VALID_16, 259 MBCS_STATE_VALID_16_PAIR, 260 261 MBCS_STATE_UNASSIGNED, 262 MBCS_STATE_ILLEGAL, 263 264 MBCS_STATE_CHANGE_ONLY 265 }; 266 267 /* Macros for state table entries */ 268 #define MBCS_ENTRY_TRANSITION(state, offset) (int32_t)(((int32_t)(state)<<24L)|(offset)) 269 #define MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, offset) (int32_t)(((entry)&0xff000000)|(offset)) 270 #define MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, offset) (int32_t)((entry)+(offset)) 271 272 #define MBCS_ENTRY_FINAL(state, action, value) (int32_t)(0x80000000|((int32_t)(state)<<24L)|((action)<<20L)|(value)) 273 #define MBCS_ENTRY_SET_FINAL(entry) (int32_t)((entry)|0x80000000) 274 #define MBCS_ENTRY_FINAL_SET_ACTION(entry, action) (int32_t)(((entry)&0xff0fffff)|((int32_t)(action)<<20L)) 275 #define MBCS_ENTRY_FINAL_SET_VALUE(entry, value) (int32_t)(((entry)&0xfff00000)|(value)) 276 #define MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, action, value) (int32_t)(((entry)&0xff000000)|((int32_t)(action)<<20L)|(value)) 277 278 #define MBCS_ENTRY_SET_STATE(entry, state) (int32_t)(((entry)&0x80ffffff)|((int32_t)(state)<<24L)) 279 280 #define MBCS_ENTRY_STATE(entry) ((((uint32_t)entry)>>24)&0x7f) 281 282 #define MBCS_ENTRY_IS_TRANSITION(entry) ((entry)>=0) 283 #define MBCS_ENTRY_IS_FINAL(entry) ((entry)<0) 284 285 #define MBCS_ENTRY_TRANSITION_STATE(entry) (((uint32_t)entry)>>24) 286 #define MBCS_ENTRY_TRANSITION_OFFSET(entry) ((entry)&0xffffff) 287 288 #define MBCS_ENTRY_FINAL_STATE(entry) ((((uint32_t)entry)>>24)&0x7f) 289 #define MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry) ((entry)<(int32_t)0x80100000) 290 #define MBCS_ENTRY_FINAL_ACTION(entry) ((((uint32_t)entry)>>20)&0xf) 291 #define MBCS_ENTRY_FINAL_VALUE(entry) ((entry)&0xfffff) 292 #define MBCS_ENTRY_FINAL_VALUE_16(entry) (uint16_t)(entry) 293 294 #define IS_ASCII_ROUNDTRIP(b, asciiRoundtrips) (((asciiRoundtrips) & (1<<((b)>>2)))!=0) 295 296 /* single-byte fromUnicode: get the 16-bit result word */ 297 #define MBCS_SINGLE_RESULT_FROM_U(table, results, c) (results)[ (table)[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] +((c)&0xf) ] 298 299 /* single-byte fromUnicode using the sbcsIndex */ 300 #define SBCS_RESULT_FROM_LOW_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] 301 302 /* single-byte fromUTF8 using the sbcsIndex; l and t must be masked externally; can be l=0 and t<=0x7f */ 303 #define SBCS_RESULT_FROM_UTF8(table, results, l, t) (results)[ (table)[l] +(t) ] 304 305 /* multi-byte fromUnicode: get the 32-bit stage 2 entry */ 306 #define MBCS_STAGE_2_FROM_U(table, c) ((const uint32_t *)(table))[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] 307 #define MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ( ((stage2Entry) & ((uint32_t)1<< (16+((c)&0xf)) )) !=0) 308 309 #define MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c) ((uint16_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] 310 #define MBCS_VALUE_4_FROM_STAGE_2(bytes, stage2Entry, c) ((uint32_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] 311 312 #define MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c) ((bytes)+(16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf))*3) 313 314 /* double-byte fromUnicode using the mbcsIndex */ 315 #define DBCS_RESULT_FROM_MOST_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] 316 317 /* double-byte fromUTF8 using the mbcsIndex; l and t1 combined into lt1; lt1 and t2 must be masked externally */ 318 #define DBCS_RESULT_FROM_UTF8(table, results, lt1, t2) (results)[ (table)[lt1] +(t2) ] 319 320 321 /** 322 * MBCS output types for conversions from Unicode. 323 * These per-converter types determine the storage method in stage 3 of the lookup table, 324 * mostly how many bytes are stored per entry. 325 */ 326 enum { 327 MBCS_OUTPUT_1, /* 0 */ 328 MBCS_OUTPUT_2, /* 1 */ 329 MBCS_OUTPUT_3, /* 2 */ 330 MBCS_OUTPUT_4, /* 3 */ 331 332 MBCS_OUTPUT_3_EUC=8, /* 8 */ 333 MBCS_OUTPUT_4_EUC, /* 9 */ 334 335 MBCS_OUTPUT_2_SISO=12, /* c */ 336 MBCS_OUTPUT_2_HZ, /* d */ 337 338 MBCS_OUTPUT_EXT_ONLY, /* e */ 339 340 MBCS_OUTPUT_COUNT, 341 342 MBCS_OUTPUT_DBCS_ONLY=0xdb /* runtime-only type for DBCS-only handling of SISO tables */ 343 }; 344 345 /** 346 * Fallbacks to Unicode are stored outside the normal state table and code point structures 347 * in a vector of items of this type. They are sorted by offset. 348 */ 349 typedef struct { 350 uint32_t offset; 351 UChar32 codePoint; 352 } _MBCSToUFallback; 353 354 /** Constants for fast and UTF-8-friendly conversion. */ 355 enum { 356 SBCS_FAST_MAX=0x0fff, /* maximum code point with UTF-8-friendly SBCS runtime code, see makeconv SBCS_UTF8_MAX */ 357 SBCS_FAST_LIMIT=SBCS_FAST_MAX+1, /* =0x1000 */ 358 MBCS_FAST_MAX=0xd7ff, /* maximum code point with UTF-8-friendly MBCS runtime code, see makeconv MBCS_UTF8_MAX */ 359 MBCS_FAST_LIMIT=MBCS_FAST_MAX+1 /* =0xd800 */ 360 }; 361 362 /** 363 * This is the MBCS part of the UConverterTable union (a runtime data structure). 364 * It keeps all the per-converter data and points into the loaded mapping tables. 365 * 366 * utf8Friendly data structures added with _MBCSHeader.version 4.3 367 */ 368 typedef struct UConverterMBCSTable { 369 /* toUnicode */ 370 uint8_t countStates, dbcsOnlyState, stateTableOwned; 371 uint32_t countToUFallbacks; 372 373 const int32_t (*stateTable)/*[countStates]*/[256]; 374 int32_t (*swapLFNLStateTable)/*[countStates]*/[256]; /* for swaplfnl */ 375 const uint16_t *unicodeCodeUnits/*[countUnicodeResults]*/; 376 const _MBCSToUFallback *toUFallbacks; 377 378 /* fromUnicode */ 379 const uint16_t *fromUnicodeTable; 380 const uint16_t *mbcsIndex; /* for fast conversion from most of BMP to MBCS (utf8Friendly data) */ 381 uint16_t sbcsIndex[SBCS_FAST_LIMIT>>6]; /* for fast conversion from low BMP to SBCS (utf8Friendly data) */ 382 const uint8_t *fromUnicodeBytes; 383 uint8_t *swapLFNLFromUnicodeBytes; /* for swaplfnl */ 384 uint32_t fromUBytesLength; 385 uint8_t outputType, unicodeMask; 386 UBool utf8Friendly; /* for utf8Friendly data */ 387 UChar maxFastUChar; /* for utf8Friendly data */ 388 389 /* roundtrips */ 390 uint32_t asciiRoundtrips; 391 392 /* reconstituted data that was omitted from the .cnv file */ 393 uint8_t *reconstitutedData; 394 395 /* converter name for swaplfnl */ 396 char *swapLFNLName; 397 398 /* extension data */ 399 struct UConverterSharedData *baseSharedData; 400 const int32_t *extIndexes; 401 } UConverterMBCSTable; 402 403 #define UCNV_MBCS_TABLE_INITIALIZER { \ 404 /* toUnicode */ \ 405 0, 0, 0, \ 406 0, \ 407 \ 408 NULL, \ 409 NULL, \ 410 NULL, \ 411 NULL, \ 412 \ 413 /* fromUnicode */ \ 414 NULL, \ 415 NULL, \ 416 { 0 }, \ 417 NULL, \ 418 NULL, \ 419 0, \ 420 0, 0, \ 421 FALSE, \ 422 0, \ 423 \ 424 /* roundtrips */ \ 425 0, \ 426 \ 427 /* reconstituted data that was omitted from the .cnv file */ \ 428 NULL, \ 429 \ 430 /* converter name for swaplfnl */ \ 431 NULL, \ 432 \ 433 /* extension data */ \ 434 NULL, \ 435 NULL \ 436 } 437 438 enum { 439 MBCS_OPT_LENGTH_MASK=0x3f, 440 MBCS_OPT_NO_FROM_U=0x40, 441 /* 442 * If any of the following options bits are set, 443 * then the file must be rejected. 444 */ 445 MBCS_OPT_INCOMPATIBLE_MASK=0xffc0, 446 /* 447 * Remove bits from this mask as more options are recognized 448 * by all implementations that use this constant. 449 */ 450 MBCS_OPT_UNKNOWN_INCOMPATIBLE_MASK=0xff80 451 }; 452 453 enum { 454 MBCS_HEADER_V4_LENGTH=8, 455 MBCS_HEADER_V5_MIN_LENGTH=9 456 }; 457 458 /** 459 * MBCS data header. See data format description above. 460 */ 461 typedef struct { 462 UVersionInfo version; 463 uint32_t countStates, 464 countToUFallbacks, 465 offsetToUCodeUnits, 466 offsetFromUTable, 467 offsetFromUBytes, 468 flags, 469 fromUBytesLength; 470 471 /* new and required in version 5 */ 472 uint32_t options; 473 474 /* new and optional in version 5; used if options&MBCS_OPT_NO_FROM_U */ 475 uint32_t fullStage2Length; /* number of 32-bit units */ 476 } _MBCSHeader; 477 478 #define UCNV_MBCS_HEADER_INITIALIZER { { 0 }, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 479 480 /* 481 * This is a simple version of _MBCSGetNextUChar() that is used 482 * by other converter implementations. 483 * It only returns an "assigned" result if it consumes the entire input. 484 * It does not use state from the converter, nor error codes. 485 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 486 * It handles conversion extensions but not GB 18030. 487 * 488 * Return value: 489 * U+fffe unassigned 490 * U+ffff illegal 491 * otherwise the Unicode code point 492 */ 493 U_CFUNC UChar32 494 ucnv_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData, 495 const char *source, int32_t length, 496 UBool useFallback); 497 498 /** 499 * This version of _MBCSSimpleGetNextUChar() is optimized for single-byte, single-state codepages. 500 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 501 * It does not handle conversion extensions (_extToU()). 502 */ 503 U_CFUNC UChar32 504 ucnv_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData, 505 uint8_t b, UBool useFallback); 506 507 /** 508 * This macro version of _MBCSSingleSimpleGetNextUChar() gets a code point from a byte. 509 * It works for single-byte, single-state codepages that only map 510 * to and from BMP code points, and it always 511 * returns fallback values. 512 */ 513 #define _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(sharedData, b) \ 514 (UChar)MBCS_ENTRY_FINAL_VALUE_16((sharedData)->mbcs.stateTable[0][(uint8_t)(b)]) 515 516 /** 517 * This is an internal function that allows other converter implementations 518 * to check whether a byte is a lead byte. 519 */ 520 U_CFUNC UBool 521 ucnv_MBCSIsLeadByte(UConverterSharedData *sharedData, char byte); 522 523 /** This is a macro version of _MBCSIsLeadByte(). */ 524 #define _MBCS_IS_LEAD_BYTE(sharedData, byte) \ 525 (UBool)MBCS_ENTRY_IS_TRANSITION((sharedData)->mbcs.stateTable[0][(uint8_t)(byte)]) 526 527 /* 528 * This is another simple conversion function for internal use by other 529 * conversion implementations. 530 * It does not use the converter state nor call callbacks. 531 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 532 * It handles conversion extensions but not GB 18030. 533 * 534 * It converts one single Unicode code point into codepage bytes, encoded 535 * as one 32-bit value. The function returns the number of bytes in *pValue: 536 * 1..4 the number of bytes in *pValue 537 * 0 unassigned (*pValue undefined) 538 * -1 illegal (currently not used, *pValue undefined) 539 * 540 * *pValue will contain the resulting bytes with the last byte in bits 7..0, 541 * the second to last byte in bits 15..8, etc. 542 * Currently, the function assumes but does not check that 0<=c<=0x10ffff. 543 */ 544 U_CFUNC int32_t 545 ucnv_MBCSFromUChar32(UConverterSharedData *sharedData, 546 UChar32 c, uint32_t *pValue, 547 UBool useFallback); 548 549 /** 550 * This version of _MBCSFromUChar32() is optimized for single-byte codepages. 551 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 552 * 553 * It returns the codepage byte for the code point, or -1 if it is unassigned. 554 */ 555 U_CFUNC int32_t 556 ucnv_MBCSSingleFromUChar32(UConverterSharedData *sharedData, 557 UChar32 c, 558 UBool useFallback); 559 560 /** 561 * SBCS, DBCS, and EBCDIC_STATEFUL are replaced by MBCS, but 562 * we cheat a little about the type, returning the old types if appropriate. 563 */ 564 U_CFUNC UConverterType 565 ucnv_MBCSGetType(const UConverter* converter); 566 567 U_CFUNC void 568 ucnv_MBCSFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs, 569 UErrorCode *pErrorCode); 570 U_CFUNC void 571 ucnv_MBCSToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs, 572 UErrorCode *pErrorCode); 573 574 /* 575 * Internal function returning a UnicodeSet for toUnicode() conversion. 576 * Currently only used for ISO-2022-CN, and only handles roundtrip mappings. 577 * In the future, if we add support for fallback sets, this function 578 * needs to be updated. 579 * Handles extensions. 580 * Does not empty the set first. 581 */ 582 U_CFUNC void 583 ucnv_MBCSGetUnicodeSetForUnicode(const UConverterSharedData *sharedData, 584 const USetAdder *sa, 585 UConverterUnicodeSet which, 586 UErrorCode *pErrorCode); 587 588 /* 589 * Same as ucnv_MBCSGetUnicodeSetForUnicode() but 590 * the set can be filtered by encoding scheme. 591 * Used by stateful converters which share regular conversion tables 592 * but only use a subset of their mappings. 593 */ 594 U_CFUNC void 595 ucnv_MBCSGetFilteredUnicodeSetForUnicode(const UConverterSharedData *sharedData, 596 const USetAdder *sa, 597 UConverterUnicodeSet which, 598 UConverterSetFilter filter, 599 UErrorCode *pErrorCode); 600 601 #endif 602 603 #endif 604
