1 /* 2 ****************************************************************************** 3 * 4 * Copyright (C) 2000-2007, 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 4.3 optionally modifies the fromUnicode data structures 64 * slightly and optionally adds a table for conversion to MBCS (non-SBCS) 65 * charsets. 66 * 67 * The modifications are to make the data utf8Friendly. Not every 4.3 file 68 * file contains utf8Friendly data. 69 * It is utf8Friendly if _MBCSHeader.version[2]!=0. 70 * In this case, the data structures are utf8Friendly up to the code point 71 * maxFastUChar=((_MBCSHeader.version[2]<<8)|0xff) 72 * 73 * A utf8Friendly file has fromUnicode stage 3 entries for code points up to 74 * maxFastUChar allocated in blocks of 64 for indexing with the 6 bits from 75 * a UTF-8 trail byte. ASCII is allocated linearly with 128 contiguous entries. 76 * 77 * In addition, a utf8Friendly MBCS file contains an additional 78 * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; 79 * which replaces the stage 1 and 2 tables for indexing with bits from the 80 * UTF-8 lead byte and middle trail byte. Unlike the older MBCS stage 2 table, 81 * the mbcsIndex does not contain roundtrip flags. Therefore, all fallbacks 82 * from code points up to maxFastUChar (and roundtrips to 0x00) are moved to 83 * the extension data structure. This also allows for faster roundtrip 84 * conversion from UTF-16. 85 * 86 * SBCS files do not contain an additional sbcsIndex[] array because the 87 * proportional size increase would be noticeable, but the runtime 88 * code builds one for the code point range for which the runtime conversion 89 * code is optimized. 90 * 91 * For SBCS, maxFastUChar should be at least U+0FFF. The initial makeconv 92 * implementation sets it to U+1FFF. Because the sbcsIndex is not stored in 93 * the file, a larger maxFastUChar only affects stage 3 block allocation size 94 * and is free in empty blocks. (Larger blocks with sparse contents cause larger 95 * files.) U+1FFF includes almost all of the small scripts. 96 * U+0FFF covers UTF-8 two-byte sequences and three-byte sequences starting with 97 * 0xe0. This includes most scripts with legacy SBCS charsets. 98 * The initial runtime implementation using 4.3 files only builds an sbcsIndex 99 * for code points up to U+0FFF. 100 * 101 * For MBCS, maxFastUChar should be at least U+D7FF (=initial value). 102 * This boundary is convenient because practically all of the commonly used 103 * characters are below it, and because it is the boundary to surrogate 104 * code points, above which special handling is necessary anyway. 105 * (Surrogate pair assembly for UTF-16, validity checking for UTF-8.) 106 * 107 * maxFastUChar could be up to U+FFFF to cover the whole BMP, which could be 108 * useful especially for conversion from UTF-8 when the input can be assumed 109 * to be valid, because the surrogate range would then not have to be 110 * checked. 111 * (With maxFastUChar=0xffff, makeconv would have to check for mbcsIndex value 112 * overflow because with the all-unassigned block 0 and nearly full mappings 113 * from the BMP it is theoretically possible that an index into stage 3 114 * exceeds 16 bits.) 115 * 116 * _MBCSHeader.version 4.2 adds an optional conversion extension data structure. 117 * If it is present, then an ICU version reading header versions 4.0 or 4.1 118 * will be able to use the base table and ignore the extension. 119 * 120 * The unicodeMask in the static data is part of the base table data structure. 121 * Especially, the UCNV_HAS_SUPPLEMENTARY flag determines the length of the 122 * fromUnicode stage 1 array. 123 * The static data unicodeMask refers only to the base table's properties if 124 * a base table is included. 125 * In an extension-only file, the static data unicodeMask is 0. 126 * The extension data indexes have a separate field with the unicodeMask flags. 127 * 128 * MBCS-style data structure following the static data. 129 * Offsets are counted in bytes from the beginning of the MBCS header structure. 130 * Details about usage in comments in ucnvmbcs.c. 131 * 132 * struct _MBCSHeader (see the definition in this header file below) 133 * contains 32-bit fields as follows: 134 * 8 values: 135 * 0 uint8_t[4] MBCS version in UVersionInfo format (currently 4.3.x.0) 136 * 1 uint32_t countStates 137 * 2 uint32_t countToUFallbacks 138 * 3 uint32_t offsetToUCodeUnits 139 * 4 uint32_t offsetFromUTable 140 * 5 uint32_t offsetFromUBytes 141 * 6 uint32_t flags, bits: 142 * 31.. 8 offsetExtension -- _MBCSHeader.version 4.2 (ICU 2.8) and higher 143 * 0 for older versions and if 144 * there is not extension structure 145 * 7.. 0 outputType 146 * 7 uint32_t fromUBytesLength -- _MBCSHeader.version 4.1 (ICU 2.4) and higher 147 * counts bytes in fromUBytes[] 148 * 149 * New and required in version 5: 150 * 8 uint32_t options, bits: 151 * 31..16 reserved for flags that can be added without breaking 152 * backward compatibility 153 * 15.. 6 reserved for flags whose addition will break 154 * backward compatibility 155 * 6 MBCS_OPT_FROM_U -- if set, 156 * then most of the fromUnicode data is omitted; 157 * fullStage2Length is present and the missing 158 * bottom part of stage 2 must be reconstituted from 159 * the toUnicode data; 160 * stage 3 is missing completely as well; 161 * not used for SBCS tables 162 * 5.. 0 length of the _MBCSHeader (number of uint32_t) 163 * 164 * New and optional in version 5: 165 * 9 uint32_t fullStage2Length: used if MBCS_OPT_FROM_U is set 166 * specifies the full length of stage 2 167 * including the omitted part 168 * 169 * if(outputType==MBCS_OUTPUT_EXT_ONLY) { 170 * -- base table name for extension-only table 171 * char baseTableName[variable]; -- with NUL plus padding for 4-alignment 172 * 173 * -- all _MBCSHeader fields except for version and flags are 0 174 * } else { 175 * -- normal base table with optional extension 176 * 177 * int32_t stateTable[countStates][256]; 178 * 179 * struct _MBCSToUFallback { (fallbacks are sorted by offset) 180 * uint32_t offset; 181 * UChar32 codePoint; 182 * } toUFallbacks[countToUFallbacks]; 183 * 184 * uint16_t unicodeCodeUnits[(offsetFromUTable-offsetToUCodeUnits)/2]; 185 * (padded to an even number of units) 186 * 187 * -- stage 1 tables 188 * if(staticData.unicodeMask&UCNV_HAS_SUPPLEMENTARY) { 189 * -- stage 1 table for all of Unicode 190 * uint16_t fromUTable[0x440]; (32-bit-aligned) 191 * } else { 192 * -- BMP-only tables have a smaller stage 1 table 193 * uint16_t fromUTable[0x40]; (32-bit-aligned) 194 * } 195 * 196 * -- stage 2 tables 197 * length determined by top of stage 1 and bottom of stage 3 tables 198 * if(outputType==MBCS_OUTPUT_1) { 199 * -- SBCS: pure indexes 200 * uint16_t stage 2 indexes[?]; 201 * } else { 202 * -- DBCS, MBCS, EBCDIC_STATEFUL, ...: roundtrip flags and indexes 203 * uint32_t stage 2 flags and indexes[?]; 204 * if(options&MBCS_OPT_NO_FROM_U) { 205 * stage 2 really has length fullStage2Length 206 * and the omitted lower part must be reconstituted from 207 * the toUnicode data 208 * } 209 * } 210 * 211 * -- stage 3 tables with byte results 212 * if(outputType==MBCS_OUTPUT_1) { 213 * -- SBCS: each 16-bit result contains flags and the result byte, see ucnvmbcs.c 214 * uint16_t fromUBytes[fromUBytesLength/2]; 215 * } else if(!(options&MBCS_OPT_NO_FROM_U)) { 216 * -- DBCS, MBCS, EBCDIC_STATEFUL, ... 2/3/4 bytes result, see ucnvmbcs.c 217 * uint8_t fromUBytes[fromUBytesLength]; or 218 * uint16_t fromUBytes[fromUBytesLength/2]; or 219 * uint32_t fromUBytes[fromUBytesLength/4]; 220 * } else { 221 * fromUBytes[] must be reconstituted from the toUnicode data 222 * } 223 * 224 * -- optional utf8Friendly mbcsIndex -- _MBCSHeader.version 4.3 (ICU 3.8) and higher 225 * if(outputType!=MBCS_OUTPUT_1 && 226 * _MBCSHeader.version[1]>=3 && 227 * (maxFastUChar=_MBCSHeader.version[2])!=0 228 * ) { 229 * maxFastUChar=(maxFastUChar<<8)|0xff; 230 * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; 231 * } 232 * } 233 * 234 * -- extension table, details see ucnv_ext.h 235 * int32_t indexes[>=32]; ... 236 */ 237 238 /* MBCS converter data and state -------------------------------------------- */ 239 240 enum { 241 MBCS_MAX_STATE_COUNT=128 242 }; 243 244 /** 245 * MBCS action codes for conversions to Unicode. 246 * These values are in bits 23..20 of the state table entries. 247 */ 248 enum { 249 MBCS_STATE_VALID_DIRECT_16, 250 MBCS_STATE_VALID_DIRECT_20, 251 252 MBCS_STATE_FALLBACK_DIRECT_16, 253 MBCS_STATE_FALLBACK_DIRECT_20, 254 255 MBCS_STATE_VALID_16, 256 MBCS_STATE_VALID_16_PAIR, 257 258 MBCS_STATE_UNASSIGNED, 259 MBCS_STATE_ILLEGAL, 260 261 MBCS_STATE_CHANGE_ONLY 262 }; 263 264 /* Macros for state table entries */ 265 #define MBCS_ENTRY_TRANSITION(state, offset) (int32_t)(((int32_t)(state)<<24L)|(offset)) 266 #define MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, offset) (int32_t)(((entry)&0xff000000)|(offset)) 267 #define MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, offset) (int32_t)((entry)+(offset)) 268 269 #define MBCS_ENTRY_FINAL(state, action, value) (int32_t)(0x80000000|((int32_t)(state)<<24L)|((action)<<20L)|(value)) 270 #define MBCS_ENTRY_SET_FINAL(entry) (int32_t)((entry)|0x80000000) 271 #define MBCS_ENTRY_FINAL_SET_ACTION(entry, action) (int32_t)(((entry)&0xff0fffff)|((int32_t)(action)<<20L)) 272 #define MBCS_ENTRY_FINAL_SET_VALUE(entry, value) (int32_t)(((entry)&0xfff00000)|(value)) 273 #define MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, action, value) (int32_t)(((entry)&0xff000000)|((int32_t)(action)<<20L)|(value)) 274 275 #define MBCS_ENTRY_SET_STATE(entry, state) (int32_t)(((entry)&0x80ffffff)|((int32_t)(state)<<24L)) 276 277 #define MBCS_ENTRY_STATE(entry) (((entry)>>24)&0x7f) 278 279 #define MBCS_ENTRY_IS_TRANSITION(entry) ((entry)>=0) 280 #define MBCS_ENTRY_IS_FINAL(entry) ((entry)<0) 281 282 #define MBCS_ENTRY_TRANSITION_STATE(entry) ((entry)>>24) 283 #define MBCS_ENTRY_TRANSITION_OFFSET(entry) ((entry)&0xffffff) 284 285 #define MBCS_ENTRY_FINAL_STATE(entry) (((entry)>>24)&0x7f) 286 #define MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry) ((entry)<(int32_t)0x80100000) 287 #define MBCS_ENTRY_FINAL_ACTION(entry) (((entry)>>20)&0xf) 288 #define MBCS_ENTRY_FINAL_VALUE(entry) ((entry)&0xfffff) 289 #define MBCS_ENTRY_FINAL_VALUE_16(entry) (uint16_t)(entry) 290 291 #define IS_ASCII_ROUNDTRIP(b, asciiRoundtrips) (((asciiRoundtrips) & (1<<((b)>>2)))!=0) 292 293 /* single-byte fromUnicode: get the 16-bit result word */ 294 #define MBCS_SINGLE_RESULT_FROM_U(table, results, c) (results)[ (table)[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] +((c)&0xf) ] 295 296 /* single-byte fromUnicode using the sbcsIndex */ 297 #define SBCS_RESULT_FROM_LOW_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] 298 299 /* single-byte fromUTF8 using the sbcsIndex; l and t must be masked externally; can be l=0 and t<=0x7f */ 300 #define SBCS_RESULT_FROM_UTF8(table, results, l, t) (results)[ (table)[l] +(t) ] 301 302 /* multi-byte fromUnicode: get the 32-bit stage 2 entry */ 303 #define MBCS_STAGE_2_FROM_U(table, c) ((const uint32_t *)(table))[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] 304 #define MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ( ((stage2Entry) & ((uint32_t)1<< (16+((c)&0xf)) )) !=0) 305 306 #define MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c) ((uint16_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] 307 #define MBCS_VALUE_4_FROM_STAGE_2(bytes, stage2Entry, c) ((uint32_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] 308 309 #define MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c) ((bytes)+(16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf))*3) 310 311 /* double-byte fromUnicode using the mbcsIndex */ 312 #define DBCS_RESULT_FROM_MOST_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] 313 314 /* double-byte fromUTF8 using the mbcsIndex; l and t1 combined into lt1; lt1 and t2 must be masked externally */ 315 #define DBCS_RESULT_FROM_UTF8(table, results, lt1, t2) (results)[ (table)[lt1] +(t2) ] 316 317 318 /** 319 * MBCS output types for conversions from Unicode. 320 * These per-converter types determine the storage method in stage 3 of the lookup table, 321 * mostly how many bytes are stored per entry. 322 */ 323 enum { 324 MBCS_OUTPUT_1, /* 0 */ 325 MBCS_OUTPUT_2, /* 1 */ 326 MBCS_OUTPUT_3, /* 2 */ 327 MBCS_OUTPUT_4, /* 3 */ 328 329 MBCS_OUTPUT_3_EUC=8, /* 8 */ 330 MBCS_OUTPUT_4_EUC, /* 9 */ 331 332 MBCS_OUTPUT_2_SISO=12, /* c */ 333 MBCS_OUTPUT_2_HZ, /* d */ 334 335 MBCS_OUTPUT_EXT_ONLY, /* e */ 336 337 MBCS_OUTPUT_COUNT, 338 339 MBCS_OUTPUT_DBCS_ONLY=0xdb /* runtime-only type for DBCS-only handling of SISO tables */ 340 }; 341 342 /** 343 * Fallbacks to Unicode are stored outside the normal state table and code point structures 344 * in a vector of items of this type. They are sorted by offset. 345 */ 346 typedef struct { 347 uint32_t offset; 348 UChar32 codePoint; 349 } _MBCSToUFallback; 350 351 /** Constants for fast and UTF-8-friendly conversion. */ 352 enum { 353 SBCS_FAST_MAX=0x0fff, /* maximum code point with UTF-8-friendly SBCS runtime code, see makeconv SBCS_UTF8_MAX */ 354 SBCS_FAST_LIMIT=SBCS_FAST_MAX+1, /* =0x1000 */ 355 MBCS_FAST_MAX=0xd7ff, /* maximum code point with UTF-8-friendly MBCS runtime code, see makeconv MBCS_UTF8_MAX */ 356 MBCS_FAST_LIMIT=MBCS_FAST_MAX+1 /* =0xd800 */ 357 }; 358 359 /** 360 * This is the MBCS part of the UConverterTable union (a runtime data structure). 361 * It keeps all the per-converter data and points into the loaded mapping tables. 362 * 363 * utf8Friendly data structures added with _MBCSHeader.version 4.3 364 */ 365 typedef struct UConverterMBCSTable { 366 /* toUnicode */ 367 uint8_t countStates, dbcsOnlyState, stateTableOwned; 368 uint32_t countToUFallbacks; 369 370 const int32_t (*stateTable)/*[countStates]*/[256]; 371 int32_t (*swapLFNLStateTable)/*[countStates]*/[256]; /* for swaplfnl */ 372 const uint16_t *unicodeCodeUnits/*[countUnicodeResults]*/; 373 const _MBCSToUFallback *toUFallbacks; 374 375 /* fromUnicode */ 376 const uint16_t *fromUnicodeTable; 377 const uint16_t *mbcsIndex; /* for fast conversion from most of BMP to MBCS (utf8Friendly data) */ 378 uint16_t sbcsIndex[SBCS_FAST_LIMIT>>6]; /* for fast conversion from low BMP to SBCS (utf8Friendly data) */ 379 const uint8_t *fromUnicodeBytes; 380 uint8_t *swapLFNLFromUnicodeBytes; /* for swaplfnl */ 381 uint32_t fromUBytesLength; 382 uint8_t outputType, unicodeMask; 383 UBool utf8Friendly; /* for utf8Friendly data */ 384 UChar maxFastUChar; /* for utf8Friendly data */ 385 386 /* roundtrips */ 387 uint32_t asciiRoundtrips; 388 389 /* reconstituted data that was omitted from the .cnv file */ 390 uint8_t *reconstitutedData; 391 392 /* converter name for swaplfnl */ 393 char *swapLFNLName; 394 395 /* extension data */ 396 struct UConverterSharedData *baseSharedData; 397 const int32_t *extIndexes; 398 } UConverterMBCSTable; 399 400 enum { 401 MBCS_OPT_LENGTH_MASK=0x3f, 402 MBCS_OPT_NO_FROM_U=0x40, 403 /* 404 * If any of the following options bits are set, 405 * then the file must be rejected. 406 */ 407 MBCS_OPT_INCOMPATIBLE_MASK=0xffc0, 408 /* 409 * Remove bits from this mask as more options are recognized 410 * by all implementations that use this constant. 411 */ 412 MBCS_OPT_UNKNOWN_INCOMPATIBLE_MASK=0xff80 413 }; 414 415 enum { 416 MBCS_HEADER_V4_LENGTH=8, 417 MBCS_HEADER_V5_MIN_LENGTH=9 418 }; 419 420 /** 421 * MBCS data header. See data format description above. 422 */ 423 typedef struct { 424 UVersionInfo version; 425 uint32_t countStates, 426 countToUFallbacks, 427 offsetToUCodeUnits, 428 offsetFromUTable, 429 offsetFromUBytes, 430 flags, 431 fromUBytesLength; 432 433 /* new and required in version 5 */ 434 uint32_t options; 435 436 /* new and optional in version 5; used if options&MBCS_OPT_NO_FROM_U */ 437 uint32_t fullStage2Length; /* number of 32-bit units */ 438 } _MBCSHeader; 439 440 /* 441 * This is a simple version of _MBCSGetNextUChar() that is used 442 * by other converter implementations. 443 * It only returns an "assigned" result if it consumes the entire input. 444 * It does not use state from the converter, nor error codes. 445 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 446 * It handles conversion extensions but not GB 18030. 447 * 448 * Return value: 449 * U+fffe unassigned 450 * U+ffff illegal 451 * otherwise the Unicode code point 452 */ 453 U_CFUNC UChar32 454 ucnv_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData, 455 const char *source, int32_t length, 456 UBool useFallback); 457 458 /** 459 * This version of _MBCSSimpleGetNextUChar() is optimized for single-byte, single-state codepages. 460 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 461 * It does not handle conversion extensions (_extToU()). 462 */ 463 U_CFUNC UChar32 464 ucnv_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData, 465 uint8_t b, UBool useFallback); 466 467 /** 468 * This macro version of _MBCSSingleSimpleGetNextUChar() gets a code point from a byte. 469 * It works for single-byte, single-state codepages that only map 470 * to and from BMP code points, and it always 471 * returns fallback values. 472 */ 473 #define _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(sharedData, b) \ 474 (UChar)MBCS_ENTRY_FINAL_VALUE_16((sharedData)->mbcs.stateTable[0][(uint8_t)(b)]) 475 476 /** 477 * This is an internal function that allows other converter implementations 478 * to check whether a byte is a lead byte. 479 */ 480 U_CFUNC UBool 481 ucnv_MBCSIsLeadByte(UConverterSharedData *sharedData, char byte); 482 483 /** This is a macro version of _MBCSIsLeadByte(). */ 484 #define _MBCS_IS_LEAD_BYTE(sharedData, byte) \ 485 (UBool)MBCS_ENTRY_IS_TRANSITION((sharedData)->mbcs.stateTable[0][(uint8_t)(byte)]) 486 487 /* 488 * This is another simple conversion function for internal use by other 489 * conversion implementations. 490 * It does not use the converter state nor call callbacks. 491 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 492 * It handles conversion extensions but not GB 18030. 493 * 494 * It converts one single Unicode code point into codepage bytes, encoded 495 * as one 32-bit value. The function returns the number of bytes in *pValue: 496 * 1..4 the number of bytes in *pValue 497 * 0 unassigned (*pValue undefined) 498 * -1 illegal (currently not used, *pValue undefined) 499 * 500 * *pValue will contain the resulting bytes with the last byte in bits 7..0, 501 * the second to last byte in bits 15..8, etc. 502 * Currently, the function assumes but does not check that 0<=c<=0x10ffff. 503 */ 504 U_CFUNC int32_t 505 ucnv_MBCSFromUChar32(UConverterSharedData *sharedData, 506 UChar32 c, uint32_t *pValue, 507 UBool useFallback); 508 509 /** 510 * This version of _MBCSFromUChar32() is optimized for single-byte codepages. 511 * It does not handle the EBCDIC swaplfnl option (set in UConverter). 512 * 513 * It returns the codepage byte for the code point, or -1 if it is unassigned. 514 */ 515 U_CFUNC int32_t 516 ucnv_MBCSSingleFromUChar32(UConverterSharedData *sharedData, 517 UChar32 c, 518 UBool useFallback); 519 520 /** 521 * SBCS, DBCS, and EBCDIC_STATEFUL are replaced by MBCS, but 522 * we cheat a little about the type, returning the old types if appropriate. 523 */ 524 U_CFUNC UConverterType 525 ucnv_MBCSGetType(const UConverter* converter); 526 527 U_CFUNC void 528 ucnv_MBCSFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs, 529 UErrorCode *pErrorCode); 530 U_CFUNC void 531 ucnv_MBCSToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs, 532 UErrorCode *pErrorCode); 533 534 /* 535 * Internal function returning a UnicodeSet for toUnicode() conversion. 536 * Currently only used for ISO-2022-CN, and only handles roundtrip mappings. 537 * In the future, if we add support for fallback sets, this function 538 * needs to be updated. 539 * Handles extensions. 540 * Does not empty the set first. 541 */ 542 U_CFUNC void 543 ucnv_MBCSGetUnicodeSetForUnicode(const UConverterSharedData *sharedData, 544 const USetAdder *sa, 545 UConverterUnicodeSet which, 546 UErrorCode *pErrorCode); 547 548 /* 549 * Same as ucnv_MBCSGetUnicodeSetForUnicode() but 550 * the set can be filtered by encoding scheme. 551 * Used by stateful converters which share regular conversion tables 552 * but only use a subset of their mappings. 553 */ 554 U_CFUNC void 555 ucnv_MBCSGetFilteredUnicodeSetForUnicode(const UConverterSharedData *sharedData, 556 const USetAdder *sa, 557 UConverterUnicodeSet which, 558 UConverterSetFilter filter, 559 UErrorCode *pErrorCode); 560 561 #endif 562 563 #endif 564
