1/* 2********************************************************************** 3* Copyright (C) 2000-2009, International Business Machines 4* Corporation and others. All Rights Reserved. 5********************************************************************** 6* file name: ucnv_lmb.cpp 7* encoding: US-ASCII 8* tab size: 4 (not used) 9* indentation:4 10* 11* created on: 2000feb09 12* created by: Brendan Murray 13* extensively hacked up by: Jim Snyder-Grant 14* 15* Modification History: 16* 17* Date Name Description 18* 19* 06/20/2000 helena OS/400 port changes; mostly typecast. 20* 06/27/2000 Jim Snyder-Grant Deal with partial characters and small buffers. 21* Add comments to document LMBCS format and implementation 22* restructured order & breakdown of functions 23* 06/28/2000 helena Major rewrite for the callback API changes. 24*/ 25 26#include "unicode/utypes.h" 27 28#if !UCONFIG_NO_CONVERSION && !UCONFIG_NO_LEGACY_CONVERSION 29 30#include "unicode/ucnv_err.h" 31#include "unicode/ucnv.h" 32#include "unicode/uset.h" 33#include "cmemory.h" 34#include "cstring.h" 35#include "uassert.h" 36#include "ucnv_imp.h" 37#include "ucnv_bld.h" 38#include "ucnv_cnv.h" 39 40#define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0])) 41 42/* 43 LMBCS 44 45 (Lotus Multi-Byte Character Set) 46 47 LMBCS was invented in the late 1980's and is primarily used in Lotus Notes 48 databases and in Lotus 1-2-3 files. Programmers who work with the APIs 49 into these products will sometimes need to deal with strings in this format. 50 51 The code in this file provides an implementation for an ICU converter of 52 LMBCS to and from Unicode. 53 54 Since the LMBCS character set is only sparsely documented in existing 55 printed or online material, we have added extensive annotation to this 56 file to serve as a guide to understanding LMBCS. 57 58 LMBCS was originally designed with these four sometimes-competing design goals: 59 60 -Provide encodings for the characters in 12 existing national standards 61 (plus a few other characters) 62 -Minimal memory footprint 63 -Maximal speed of conversion into the existing national character sets 64 -No need to track a changing state as you interpret a string. 65 66 67 All of the national character sets LMBCS was trying to encode are 'ANSI' 68 based, in that the bytes from 0x20 - 0x7F are almost exactly the 69 same common Latin unaccented characters and symbols in all character sets. 70 71 So, in order to help meet the speed & memory design goals, the common ANSI 72 bytes from 0x20-0x7F are represented by the same single-byte values in LMBCS. 73 74 The general LMBCS code unit is from 1-3 bytes. We can describe the 3 bytes as 75 follows: 76 77 [G] D1 [D2] 78 79 That is, a sometimes-optional 'group' byte, followed by 1 and sometimes 2 80 data bytes. The maximum size of a LMBCS chjaracter is 3 bytes: 81*/ 82#define ULMBCS_CHARSIZE_MAX 3 83/* 84 The single-byte values from 0x20 to 0x7F are examples of single D1 bytes. 85 We often have to figure out if byte values are below or above this, so we 86 use the ANSI nomenclature 'C0' and 'C1' to refer to the range of control 87 characters just above & below the common lower-ANSI range */ 88#define ULMBCS_C0END 0x1F 89#define ULMBCS_C1START 0x80 90/* 91 Since LMBCS is always dealing in byte units. we create a local type here for 92 dealing with these units of LMBCS code units: 93 94*/ 95typedef uint8_t ulmbcs_byte_t; 96 97/* 98 Most of the values less than 0x20 are reserved in LMBCS to announce 99 which national character standard is being used for the 'D' bytes. 100 In the comments we show the common name and the IBM character-set ID 101 for these character-set announcers: 102*/ 103 104#define ULMBCS_GRP_L1 0x01 /* Latin-1 :ibm-850 */ 105#define ULMBCS_GRP_GR 0x02 /* Greek :ibm-851 */ 106#define ULMBCS_GRP_HE 0x03 /* Hebrew :ibm-1255 */ 107#define ULMBCS_GRP_AR 0x04 /* Arabic :ibm-1256 */ 108#define ULMBCS_GRP_RU 0x05 /* Cyrillic :ibm-1251 */ 109#define ULMBCS_GRP_L2 0x06 /* Latin-2 :ibm-852 */ 110#define ULMBCS_GRP_TR 0x08 /* Turkish :ibm-1254 */ 111#define ULMBCS_GRP_TH 0x0B /* Thai :ibm-874 */ 112#define ULMBCS_GRP_JA 0x10 /* Japanese :ibm-943 */ 113#define ULMBCS_GRP_KO 0x11 /* Korean :ibm-1261 */ 114#define ULMBCS_GRP_TW 0x12 /* Chinese SC :ibm-950 */ 115#define ULMBCS_GRP_CN 0x13 /* Chinese TC :ibm-1386 */ 116 117/* 118 So, the beginning of understanding LMBCS is that IF the first byte of a LMBCS 119 character is one of those 12 values, you can interpret the remaining bytes of 120 that character as coming from one of those character sets. Since the lower 121 ANSI bytes already are represented in single bytes, using one of the character 122 set announcers is used to announce a character that starts with a byte of 123 0x80 or greater. 124 125 The character sets are arranged so that the single byte sets all appear 126 before the multi-byte character sets. When we need to tell whether a 127 group byte is for a single byte char set or not we use this define: */ 128 129#define ULMBCS_DOUBLEOPTGROUP_START 0x10 130 131/* 132However, to fully understand LMBCS, you must also understand a series of 133exceptions & optimizations made in service of the design goals. 134 135First, those of you who are character set mavens may have noticed that 136the 'double-byte' character sets are actually multi-byte character sets 137that can have 1 or two bytes, even in the upper-ascii range. To force 138each group byte to introduce a fixed-width encoding (to make it faster to 139count characters), we use a convention of doubling up on the group byte 140to introduce any single-byte character > 0x80 in an otherwise double-byte 141character set. So, for example, the LMBCS sequence x10 x10 xAE is the 142same as '0xAE' in the Japanese code page 943. 143 144Next, you will notice that the list of group bytes has some gaps. 145These are used in various ways. 146 147We reserve a few special single byte values for common control 148characters. These are in the same place as their ANSI eqivalents for speed. 149*/ 150 151#define ULMBCS_HT 0x09 /* Fixed control char - Horizontal Tab */ 152#define ULMBCS_LF 0x0A /* Fixed control char - Line Feed */ 153#define ULMBCS_CR 0x0D /* Fixed control char - Carriage Return */ 154 155/* Then, 1-2-3 reserved a special single-byte character to put at the 156beginning of internal 'system' range names: */ 157 158#define ULMBCS_123SYSTEMRANGE 0x19 159 160/* Then we needed a place to put all the other ansi control characters 161that must be moved to different values because LMBCS reserves those 162values for other purposes. To represent the control characters, we start 163with a first byte of 0xF & add the control chaarcter value as the 164second byte */ 165#define ULMBCS_GRP_CTRL 0x0F 166 167/* For the C0 controls (less than 0x20), we add 0x20 to preserve the 168useful doctrine that any byte less than 0x20 in a LMBCS char must be 169the first byte of a character:*/ 170#define ULMBCS_CTRLOFFSET 0x20 171 172/* 173Where to put the characters that aren't part of any of the 12 national 174character sets? The first thing that was done, in the earlier years of 175LMBCS, was to use up the spaces of the form 176 177 [G] D1, 178 179 where 'G' was one of the single-byte character groups, and 180 D1 was less than 0x80. These sequences are gathered together 181 into a Lotus-invented doublebyte character set to represent a 182 lot of stray values. Internally, in this implementation, we track this 183 as group '0', as a place to tuck this exceptions list.*/ 184 185#define ULMBCS_GRP_EXCEPT 0x00 186/* 187 Finally, as the durability and usefulness of UNICODE became clear, 188 LOTUS added a new group 0x14 to hold Unicode values not otherwise 189 represented in LMBCS: */ 190#define ULMBCS_GRP_UNICODE 0x14 191/* The two bytes appearing after a 0x14 are intrepreted as UFT-16 BE 192(Big-Endian) characters. The exception comes when the UTF16 193representation would have a zero as the second byte. In that case, 194'F6' is used in its place, and the bytes are swapped. (This prevents 195LMBCS from encoding any Unicode values of the form U+F6xx, but that's OK: 1960xF6xx is in the middle of the Private Use Area.)*/ 197#define ULMBCS_UNICOMPATZERO 0xF6 198 199/* It is also useful in our code to have a constant for the size of 200a LMBCS char that holds a literal Unicode value */ 201#define ULMBCS_UNICODE_SIZE 3 202 203/* 204To squish the LMBCS representations down even further, and to make 205translations even faster,sometimes the optimization group byte can be dropped 206from a LMBCS character. This is decided on a process-by-process basis. The 207group byte that is dropped is called the 'optimization group'. 208 209For Notes, the optimzation group is always 0x1.*/ 210#define ULMBCS_DEFAULTOPTGROUP 0x1 211/* For 1-2-3 files, the optimzation group is stored in the header of the 1-2-3 212file. 213 214 In any case, when using ICU, you either pass in the 215optimization group as part of the name of the converter (LMBCS-1, LMBCS-2, 216etc.). Using plain 'LMBCS' as the name of the converter will give you 217LMBCS-1. 218 219 220*** Implementation strategy *** 221 222 223Because of the extensive use of other character sets, the LMBCS converter 224keeps a mapping between optimization groups and IBM character sets, so that 225ICU converters can be created and used as needed. */ 226 227/* As you can see, even though any byte below 0x20 could be an optimization 228byte, only those at 0x13 or below can map to an actual converter. To limit 229some loops and searches, we define a value for that last group converter:*/ 230 231#define ULMBCS_GRP_LAST 0x13 /* last LMBCS group that has a converter */ 232 233static const char * const OptGroupByteToCPName[ULMBCS_GRP_LAST + 1] = { 234 /* 0x0000 */ "lmb-excp", /* internal home for the LOTUS exceptions list */ 235 /* 0x0001 */ "ibm-850", 236 /* 0x0002 */ "ibm-851", 237 /* 0x0003 */ "windows-1255", 238 /* 0x0004 */ "windows-1256", 239 /* 0x0005 */ "windows-1251", 240 /* 0x0006 */ "ibm-852", 241 /* 0x0007 */ NULL, /* Unused */ 242 /* 0x0008 */ "windows-1254", 243 /* 0x0009 */ NULL, /* Control char HT */ 244 /* 0x000A */ NULL, /* Control char LF */ 245 /* 0x000B */ "windows-874", 246 /* 0x000C */ NULL, /* Unused */ 247 /* 0x000D */ NULL, /* Control char CR */ 248 /* 0x000E */ NULL, /* Unused */ 249 /* 0x000F */ NULL, /* Control chars: 0x0F20 + C0/C1 character: algorithmic */ 250 /* 0x0010 */ "windows-932", 251 /* 0x0011 */ "windows-949", 252 /* 0x0012 */ "windows-950", 253 /* 0x0013 */ "windows-936" 254 255 /* The rest are null, including the 0x0014 Unicode compatibility region 256 and 0x0019, the 1-2-3 system range control char */ 257}; 258 259 260/* That's approximately all the data that's needed for translating 261 LMBCS to Unicode. 262 263 264However, to translate Unicode to LMBCS, we need some more support. 265 266That's because there are often more than one possible mappings from a Unicode 267code point back into LMBCS. The first thing we do is look up into a table 268to figure out if there are more than one possible mappings. This table, 269arranged by Unicode values (including ranges) either lists which group 270to use, or says that it could go into one or more of the SBCS sets, or 271into one or more of the DBCS sets. (If the character exists in both DBCS & 272SBCS, the table will place it in the SBCS sets, to make the LMBCS code point 273length as small as possible. Here's the two special markers we use to indicate 274ambiguous mappings: */ 275 276#define ULMBCS_AMBIGUOUS_SBCS 0x80 /* could fit in more than one 277 LMBCS sbcs native encoding 278 (example: most accented latin) */ 279#define ULMBCS_AMBIGUOUS_MBCS 0x81 /* could fit in more than one 280 LMBCS mbcs native encoding 281 (example: Unihan) */ 282 283/* And here's a simple way to see if a group falls in an appropriate range */ 284#define ULMBCS_AMBIGUOUS_MATCH(agroup, xgroup) \ 285 ((((agroup) == ULMBCS_AMBIGUOUS_SBCS) && \ 286 (xgroup) < ULMBCS_DOUBLEOPTGROUP_START) || \ 287 (((agroup) == ULMBCS_AMBIGUOUS_MBCS) && \ 288 (xgroup) >= ULMBCS_DOUBLEOPTGROUP_START)) 289 290 291/* The table & some code to use it: */ 292 293 294static const struct _UniLMBCSGrpMap 295{ 296 const UChar uniStartRange; 297 const UChar uniEndRange; 298 const ulmbcs_byte_t GrpType; 299} UniLMBCSGrpMap[] 300= 301{ 302 303 {0x0001, 0x001F, ULMBCS_GRP_CTRL}, 304 {0x0080, 0x009F, ULMBCS_GRP_CTRL}, 305 {0x00A0, 0x01CD, ULMBCS_AMBIGUOUS_SBCS}, 306 {0x01CE, 0x01CE, ULMBCS_GRP_TW }, 307 {0x01CF, 0x02B9, ULMBCS_AMBIGUOUS_SBCS}, 308 {0x02BA, 0x02BA, ULMBCS_GRP_CN}, 309 {0x02BC, 0x02C8, ULMBCS_AMBIGUOUS_SBCS}, 310 {0x02C9, 0x02D0, ULMBCS_AMBIGUOUS_MBCS}, 311 {0x02D8, 0x02DD, ULMBCS_AMBIGUOUS_SBCS}, 312 {0x0384, 0x03CE, ULMBCS_AMBIGUOUS_SBCS}, 313 {0x0400, 0x044E, ULMBCS_GRP_RU}, 314 {0x044F, 0x044F, ULMBCS_AMBIGUOUS_MBCS}, 315 {0x0450, 0x0491, ULMBCS_GRP_RU}, 316 {0x05B0, 0x05F2, ULMBCS_GRP_HE}, 317 {0x060C, 0x06AF, ULMBCS_GRP_AR}, 318 {0x0E01, 0x0E5B, ULMBCS_GRP_TH}, 319 {0x200C, 0x200F, ULMBCS_AMBIGUOUS_SBCS}, 320 {0x2010, 0x2010, ULMBCS_AMBIGUOUS_MBCS}, 321 {0x2013, 0x2015, ULMBCS_AMBIGUOUS_SBCS}, 322 {0x2016, 0x2016, ULMBCS_AMBIGUOUS_MBCS}, 323 {0x2017, 0x2024, ULMBCS_AMBIGUOUS_SBCS}, 324 {0x2025, 0x2025, ULMBCS_AMBIGUOUS_MBCS}, 325 {0x2026, 0x2026, ULMBCS_AMBIGUOUS_SBCS}, 326 {0x2027, 0x2027, ULMBCS_GRP_CN}, 327 {0x2030, 0x2033, ULMBCS_AMBIGUOUS_SBCS}, 328 {0x2035, 0x2035, ULMBCS_AMBIGUOUS_MBCS}, 329 {0x2039, 0x203A, ULMBCS_AMBIGUOUS_SBCS}, 330 {0x203B, 0x203B, ULMBCS_AMBIGUOUS_MBCS}, 331 {0x2074, 0x2074, ULMBCS_GRP_KO}, 332 {0x207F, 0x207F, ULMBCS_GRP_EXCEPT}, 333 {0x2081, 0x2084, ULMBCS_GRP_KO}, 334 {0x20A4, 0x20AC, ULMBCS_AMBIGUOUS_SBCS}, 335 {0x2103, 0x2109, ULMBCS_AMBIGUOUS_MBCS}, 336 {0x2111, 0x2126, ULMBCS_AMBIGUOUS_SBCS}, 337 {0x212B, 0x212B, ULMBCS_AMBIGUOUS_MBCS}, 338 {0x2135, 0x2135, ULMBCS_AMBIGUOUS_SBCS}, 339 {0x2153, 0x2154, ULMBCS_GRP_KO}, 340 {0x215B, 0x215E, ULMBCS_GRP_EXCEPT}, 341 {0x2160, 0x2179, ULMBCS_AMBIGUOUS_MBCS}, 342 {0x2190, 0x2195, ULMBCS_GRP_EXCEPT}, 343 {0x2196, 0x2199, ULMBCS_AMBIGUOUS_MBCS}, 344 {0x21A8, 0x21A8, ULMBCS_GRP_EXCEPT}, 345 {0x21B8, 0x21B9, ULMBCS_GRP_CN}, 346 {0x21D0, 0x21D5, ULMBCS_GRP_EXCEPT}, 347 {0x21E7, 0x21E7, ULMBCS_GRP_CN}, 348 {0x2200, 0x220B, ULMBCS_GRP_EXCEPT}, 349 {0x220F, 0x2215, ULMBCS_AMBIGUOUS_MBCS}, 350 {0x2219, 0x2220, ULMBCS_GRP_EXCEPT}, 351 {0x2223, 0x2228, ULMBCS_AMBIGUOUS_MBCS}, 352 {0x2229, 0x222B, ULMBCS_GRP_EXCEPT}, 353 {0x222C, 0x223D, ULMBCS_AMBIGUOUS_MBCS}, 354 {0x2245, 0x2248, ULMBCS_GRP_EXCEPT}, 355 {0x224C, 0x224C, ULMBCS_GRP_TW}, 356 {0x2252, 0x2252, ULMBCS_AMBIGUOUS_MBCS}, 357 {0x2260, 0x2265, ULMBCS_GRP_EXCEPT}, 358 {0x2266, 0x226F, ULMBCS_AMBIGUOUS_MBCS}, 359 {0x2282, 0x2297, ULMBCS_GRP_EXCEPT}, 360 {0x2299, 0x22BF, ULMBCS_AMBIGUOUS_MBCS}, 361 {0x22C0, 0x22C0, ULMBCS_GRP_EXCEPT}, 362 {0x2310, 0x2310, ULMBCS_GRP_EXCEPT}, 363 {0x2312, 0x2312, ULMBCS_AMBIGUOUS_MBCS}, 364 {0x2318, 0x2321, ULMBCS_GRP_EXCEPT}, 365 {0x2318, 0x2321, ULMBCS_GRP_CN}, 366 {0x2460, 0x24E9, ULMBCS_AMBIGUOUS_MBCS}, 367 {0x2500, 0x2500, ULMBCS_AMBIGUOUS_SBCS}, 368 {0x2501, 0x2501, ULMBCS_AMBIGUOUS_MBCS}, 369 {0x2502, 0x2502, ULMBCS_AMBIGUOUS_SBCS}, 370 {0x2503, 0x2503, ULMBCS_AMBIGUOUS_MBCS}, 371 {0x2504, 0x2505, ULMBCS_GRP_TW}, 372 {0x2506, 0x2665, ULMBCS_AMBIGUOUS_MBCS}, 373 {0x2666, 0x2666, ULMBCS_GRP_EXCEPT}, 374 {0x2666, 0x2666, ULMBCS_GRP_EXCEPT}, 375 {0x2667, 0x2E7F, ULMBCS_AMBIGUOUS_SBCS}, 376 {0x2E80, 0xF861, ULMBCS_AMBIGUOUS_MBCS}, 377 {0xF862, 0xF8FF, ULMBCS_GRP_EXCEPT}, 378 {0xF900, 0xFA2D, ULMBCS_AMBIGUOUS_MBCS}, 379 {0xFB00, 0xFEFF, ULMBCS_AMBIGUOUS_SBCS}, 380 {0xFF01, 0xFFEE, ULMBCS_AMBIGUOUS_MBCS}, 381 {0xFFFF, 0xFFFF, ULMBCS_GRP_UNICODE} 382}; 383 384static ulmbcs_byte_t 385FindLMBCSUniRange(UChar uniChar) 386{ 387 const struct _UniLMBCSGrpMap * pTable = UniLMBCSGrpMap; 388 389 while (uniChar > pTable->uniEndRange) 390 { 391 pTable++; 392 } 393 394 if (uniChar >= pTable->uniStartRange) 395 { 396 return pTable->GrpType; 397 } 398 return ULMBCS_GRP_UNICODE; 399} 400 401/* 402We also ask the creator of a converter to send in a preferred locale 403that we can use in resolving ambiguous mappings. They send the locale 404in as a string, and we map it, if possible, to one of the 405LMBCS groups. We use this table, and the associated code, to 406do the lookup: */ 407 408/************************************************** 409 This table maps locale ID's to LMBCS opt groups. 410 The default return is group 0x01. Note that for 411 performance reasons, the table is sorted in 412 increasing alphabetic order, with the notable 413 exception of zhTW. This is to force the check 414 for Traditonal Chinese before dropping back to 415 Simplified. 416 417 Note too that the Latin-1 groups have been 418 commented out because it's the default, and 419 this shortens the table, allowing a serial 420 search to go quickly. 421 *************************************************/ 422 423static const struct _LocaleLMBCSGrpMap 424{ 425 const char *LocaleID; 426 const ulmbcs_byte_t OptGroup; 427} LocaleLMBCSGrpMap[] = 428{ 429 {"ar", ULMBCS_GRP_AR}, 430 {"be", ULMBCS_GRP_RU}, 431 {"bg", ULMBCS_GRP_L2}, 432 /* {"ca", ULMBCS_GRP_L1}, */ 433 {"cs", ULMBCS_GRP_L2}, 434 /* {"da", ULMBCS_GRP_L1}, */ 435 /* {"de", ULMBCS_GRP_L1}, */ 436 {"el", ULMBCS_GRP_GR}, 437 /* {"en", ULMBCS_GRP_L1}, */ 438 /* {"es", ULMBCS_GRP_L1}, */ 439 /* {"et", ULMBCS_GRP_L1}, */ 440 /* {"fi", ULMBCS_GRP_L1}, */ 441 /* {"fr", ULMBCS_GRP_L1}, */ 442 {"he", ULMBCS_GRP_HE}, 443 {"hu", ULMBCS_GRP_L2}, 444 /* {"is", ULMBCS_GRP_L1}, */ 445 /* {"it", ULMBCS_GRP_L1}, */ 446 {"iw", ULMBCS_GRP_HE}, 447 {"ja", ULMBCS_GRP_JA}, 448 {"ko", ULMBCS_GRP_KO}, 449 /* {"lt", ULMBCS_GRP_L1}, */ 450 /* {"lv", ULMBCS_GRP_L1}, */ 451 {"mk", ULMBCS_GRP_RU}, 452 /* {"nl", ULMBCS_GRP_L1}, */ 453 /* {"no", ULMBCS_GRP_L1}, */ 454 {"pl", ULMBCS_GRP_L2}, 455 /* {"pt", ULMBCS_GRP_L1}, */ 456 {"ro", ULMBCS_GRP_L2}, 457 {"ru", ULMBCS_GRP_RU}, 458 {"sh", ULMBCS_GRP_L2}, 459 {"sk", ULMBCS_GRP_L2}, 460 {"sl", ULMBCS_GRP_L2}, 461 {"sq", ULMBCS_GRP_L2}, 462 {"sr", ULMBCS_GRP_RU}, 463 /* {"sv", ULMBCS_GRP_L1}, */ 464 {"th", ULMBCS_GRP_TH}, 465 {"tr", ULMBCS_GRP_TR}, 466 {"uk", ULMBCS_GRP_RU}, 467 /* {"vi", ULMBCS_GRP_L1}, */ 468 {"zhTW", ULMBCS_GRP_TW}, 469 {"zh", ULMBCS_GRP_CN}, 470 {NULL, ULMBCS_GRP_L1} 471}; 472 473 474static ulmbcs_byte_t 475FindLMBCSLocale(const char *LocaleID) 476{ 477 const struct _LocaleLMBCSGrpMap *pTable = LocaleLMBCSGrpMap; 478 479 if ((!LocaleID) || (!*LocaleID)) 480 { 481 return 0; 482 } 483 484 while (pTable->LocaleID) 485 { 486 if (*pTable->LocaleID == *LocaleID) /* Check only first char for speed */ 487 { 488 /* First char matches - check whole name, for entry-length */ 489 if (uprv_strncmp(pTable->LocaleID, LocaleID, strlen(pTable->LocaleID)) == 0) 490 return pTable->OptGroup; 491 } 492 else 493 if (*pTable->LocaleID > *LocaleID) /* Sorted alphabetically - exit */ 494 break; 495 pTable++; 496 } 497 return ULMBCS_GRP_L1; 498} 499 500 501/* 502 Before we get to the main body of code, here's how we hook up to the rest 503 of ICU. ICU converters are required to define a structure that includes 504 some function pointers, and some common data, in the style of a C++ 505 vtable. There is also room in there for converter-specific data. LMBCS 506 uses that converter-specific data to keep track of the 12 subconverters 507 we use, the optimization group, and the group (if any) that matches the 508 locale. We have one structure instantiated for each of the 12 possible 509 optimization groups. To avoid typos & to avoid boring the reader, we 510 put the declarations of these structures and functions into macros. To see 511 the definitions of these structures, see unicode\ucnv_bld.h 512*/ 513 514typedef struct 515 { 516 UConverterSharedData *OptGrpConverter[ULMBCS_GRP_LAST+1]; /* Converter per Opt. grp. */ 517 uint8_t OptGroup; /* default Opt. grp. for this LMBCS session */ 518 uint8_t localeConverterIndex; /* reasonable locale match for index */ 519 } 520UConverterDataLMBCS; 521 522static void _LMBCSClose(UConverter * _this); 523 524#define DECLARE_LMBCS_DATA(n) \ 525static const UConverterImpl _LMBCSImpl##n={\ 526 UCNV_LMBCS_##n,\ 527 NULL,NULL,\ 528 _LMBCSOpen##n,\ 529 _LMBCSClose,\ 530 NULL,\ 531 _LMBCSToUnicodeWithOffsets,\ 532 _LMBCSToUnicodeWithOffsets,\ 533 _LMBCSFromUnicode,\ 534 _LMBCSFromUnicode,\ 535 NULL,\ 536 NULL,\ 537 NULL,\ 538 NULL,\ 539 _LMBCSSafeClone,\ 540 ucnv_getCompleteUnicodeSet\ 541};\ 542static const UConverterStaticData _LMBCSStaticData##n={\ 543 sizeof(UConverterStaticData),\ 544 "LMBCS-" #n,\ 545 0, UCNV_IBM, UCNV_LMBCS_##n, 1, 3,\ 546 { 0x3f, 0, 0, 0 },1,FALSE,FALSE,0,0,{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} \ 547};\ 548const UConverterSharedData _LMBCSData##n={\ 549 sizeof(UConverterSharedData), ~((uint32_t) 0),\ 550 NULL, NULL, &_LMBCSStaticData##n, FALSE, &_LMBCSImpl##n, \ 551 0 \ 552}; 553 554 /* The only function we needed to duplicate 12 times was the 'open' 555function, which will do basically the same thing except set a different 556optimization group. So, we put the common stuff into a worker function, 557and set up another macro to stamp out the 12 open functions:*/ 558#define DEFINE_LMBCS_OPEN(n) \ 559static void \ 560 _LMBCSOpen##n(UConverter* _this, UConverterLoadArgs* pArgs, UErrorCode* err) \ 561{ _LMBCSOpenWorker(_this, pArgs, err, n); } 562 563 564 565/* Here's the open worker & the common close function */ 566static void 567_LMBCSOpenWorker(UConverter* _this, 568 UConverterLoadArgs *pArgs, 569 UErrorCode* err, 570 ulmbcs_byte_t OptGroup) 571{ 572 UConverterDataLMBCS * extraInfo = _this->extraInfo = 573 (UConverterDataLMBCS*)uprv_malloc (sizeof (UConverterDataLMBCS)); 574 if(extraInfo != NULL) 575 { 576 UConverterNamePieces stackPieces; 577 UConverterLoadArgs stackArgs={ (int32_t)sizeof(UConverterLoadArgs) }; 578 ulmbcs_byte_t i; 579 580 uprv_memset(extraInfo, 0, sizeof(UConverterDataLMBCS)); 581 582 stackArgs.onlyTestIsLoadable = pArgs->onlyTestIsLoadable; 583 584 for (i=0; i <= ULMBCS_GRP_LAST && U_SUCCESS(*err); i++) 585 { 586 if(OptGroupByteToCPName[i] != NULL) { 587 extraInfo->OptGrpConverter[i] = ucnv_loadSharedData(OptGroupByteToCPName[i], &stackPieces, &stackArgs, err); 588 } 589 } 590 591 if(U_FAILURE(*err) || pArgs->onlyTestIsLoadable) { 592 _LMBCSClose(_this); 593 return; 594 } 595 extraInfo->OptGroup = OptGroup; 596 extraInfo->localeConverterIndex = FindLMBCSLocale(pArgs->locale); 597 } 598 else 599 { 600 *err = U_MEMORY_ALLOCATION_ERROR; 601 } 602} 603 604static void 605_LMBCSClose(UConverter * _this) 606{ 607 if (_this->extraInfo != NULL) 608 { 609 ulmbcs_byte_t Ix; 610 UConverterDataLMBCS * extraInfo = (UConverterDataLMBCS *) _this->extraInfo; 611 612 for (Ix=0; Ix <= ULMBCS_GRP_LAST; Ix++) 613 { 614 if (extraInfo->OptGrpConverter[Ix] != NULL) 615 ucnv_unloadSharedDataIfReady(extraInfo->OptGrpConverter[Ix]); 616 } 617 if (!_this->isExtraLocal) { 618 uprv_free (_this->extraInfo); 619 _this->extraInfo = NULL; 620 } 621 } 622} 623 624typedef struct LMBCSClone { 625 UConverter cnv; 626 UConverterDataLMBCS lmbcs; 627} LMBCSClone; 628 629static UConverter * 630_LMBCSSafeClone(const UConverter *cnv, 631 void *stackBuffer, 632 int32_t *pBufferSize, 633 UErrorCode *status) { 634 LMBCSClone *newLMBCS; 635 UConverterDataLMBCS *extraInfo; 636 int32_t i; 637 638 if(*pBufferSize<=0) { 639 *pBufferSize=(int32_t)sizeof(LMBCSClone); 640 return NULL; 641 } 642 643 extraInfo=(UConverterDataLMBCS *)cnv->extraInfo; 644 newLMBCS=(LMBCSClone *)stackBuffer; 645 646 /* ucnv.c/ucnv_safeClone() copied the main UConverter already */ 647 648 uprv_memcpy(&newLMBCS->lmbcs, extraInfo, sizeof(UConverterDataLMBCS)); 649 650 /* share the subconverters */ 651 for(i = 0; i <= ULMBCS_GRP_LAST; ++i) { 652 if(extraInfo->OptGrpConverter[i] != NULL) { 653 ucnv_incrementRefCount(extraInfo->OptGrpConverter[i]); 654 } 655 } 656 657 newLMBCS->cnv.extraInfo = &newLMBCS->lmbcs; 658 newLMBCS->cnv.isExtraLocal = TRUE; 659 return &newLMBCS->cnv; 660} 661 662/* 663 * There used to be a _LMBCSGetUnicodeSet() function here (up to svn revision 20117) 664 * which added all code points except for U+F6xx 665 * because those cannot be represented in the Unicode group. 666 * However, it turns out that windows-950 has roundtrips for all of U+F6xx 667 * which means that LMBCS can convert all Unicode code points after all. 668 * We now simply use ucnv_getCompleteUnicodeSet(). 669 */ 670 671/* 672 Here's the basic helper function that we use when converting from 673 Unicode to LMBCS, and we suspect that a Unicode character will fit into 674 one of the 12 groups. The return value is the number of bytes written 675 starting at pStartLMBCS (if any). 676*/ 677 678static size_t 679LMBCSConversionWorker ( 680 UConverterDataLMBCS * extraInfo, /* subconverters, opt & locale groups */ 681 ulmbcs_byte_t group, /* The group to try */ 682 ulmbcs_byte_t * pStartLMBCS, /* where to put the results */ 683 UChar * pUniChar, /* The input unicode character */ 684 ulmbcs_byte_t * lastConverterIndex, /* output: track last successful group used */ 685 UBool * groups_tried /* output: track any unsuccessful groups */ 686) 687{ 688 ulmbcs_byte_t * pLMBCS = pStartLMBCS; 689 UConverterSharedData * xcnv = extraInfo->OptGrpConverter[group]; 690 691 int bytesConverted; 692 uint32_t value; 693 ulmbcs_byte_t firstByte; 694 695 U_ASSERT(xcnv); 696 U_ASSERT(group<ULMBCS_GRP_UNICODE); 697 698 bytesConverted = ucnv_MBCSFromUChar32(xcnv, *pUniChar, &value, FALSE); 699 700 /* get the first result byte */ 701 if(bytesConverted > 0) { 702 firstByte = (ulmbcs_byte_t)(value >> ((bytesConverted - 1) * 8)); 703 } else { 704 /* most common failure mode is an unassigned character */ 705 groups_tried[group] = TRUE; 706 return 0; 707 } 708 709 *lastConverterIndex = group; 710 711 /* All initial byte values in lower ascii range should have been caught by now, 712 except with the exception group. 713 */ 714 U_ASSERT((firstByte <= ULMBCS_C0END) || (firstByte >= ULMBCS_C1START) || (group == ULMBCS_GRP_EXCEPT)); 715 716 /* use converted data: first write 0, 1 or two group bytes */ 717 if (group != ULMBCS_GRP_EXCEPT && extraInfo->OptGroup != group) 718 { 719 *pLMBCS++ = group; 720 if (bytesConverted == 1 && group >= ULMBCS_DOUBLEOPTGROUP_START) 721 { 722 *pLMBCS++ = group; 723 } 724 } 725 726 /* don't emit control chars */ 727 if ( bytesConverted == 1 && firstByte < 0x20 ) 728 return 0; 729 730 731 /* then move over the converted data */ 732 switch(bytesConverted) 733 { 734 case 4: 735 *pLMBCS++ = (ulmbcs_byte_t)(value >> 24); 736 case 3: 737 *pLMBCS++ = (ulmbcs_byte_t)(value >> 16); 738 case 2: 739 *pLMBCS++ = (ulmbcs_byte_t)(value >> 8); 740 case 1: 741 *pLMBCS++ = (ulmbcs_byte_t)value; 742 default: 743 /* will never occur */ 744 break; 745 } 746 747 return (pLMBCS - pStartLMBCS); 748} 749 750 751/* This is a much simpler version of above, when we 752know we are writing LMBCS using the Unicode group 753*/ 754static size_t 755LMBCSConvertUni(ulmbcs_byte_t * pLMBCS, UChar uniChar) 756{ 757 /* encode into LMBCS Unicode range */ 758 uint8_t LowCh = (uint8_t)(uniChar & 0x00FF); 759 uint8_t HighCh = (uint8_t)(uniChar >> 8); 760 761 *pLMBCS++ = ULMBCS_GRP_UNICODE; 762 763 if (LowCh == 0) 764 { 765 *pLMBCS++ = ULMBCS_UNICOMPATZERO; 766 *pLMBCS++ = HighCh; 767 } 768 else 769 { 770 *pLMBCS++ = HighCh; 771 *pLMBCS++ = LowCh; 772 } 773 return ULMBCS_UNICODE_SIZE; 774} 775 776 777 778/* The main Unicode to LMBCS conversion function */ 779static void 780_LMBCSFromUnicode(UConverterFromUnicodeArgs* args, 781 UErrorCode* err) 782{ 783 ulmbcs_byte_t lastConverterIndex = 0; 784 UChar uniChar; 785 ulmbcs_byte_t LMBCS[ULMBCS_CHARSIZE_MAX]; 786 ulmbcs_byte_t * pLMBCS; 787 int bytes_written; 788 UBool groups_tried[ULMBCS_GRP_LAST+1]; 789 UConverterDataLMBCS * extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo; 790 int sourceIndex = 0; 791 792 793 /* Basic strategy: attempt to fill in local LMBCS 1-char buffer.(LMBCS) 794 If that succeeds, see if it will all fit into the target & copy it over 795 if it does. 796 797 We try conversions in the following order: 798 799 1. Single-byte ascii & special fixed control chars (&null) 800 2. Look up group in table & try that (could be 801 A) Unicode group 802 B) control group, 803 C) national encoding, 804 or ambiguous SBCS or MBCS group (on to step 4...) 805 806 3. If its ambiguous, try this order: 807 A) The optimization group 808 B) The locale group 809 C) The last group that succeeded with this string. 810 D) every other group that's relevent (single or double) 811 E) If its single-byte ambiguous, try the exceptions group 812 813 4. And as a grand fallback: Unicode 814 */ 815 816 while (args->source < args->sourceLimit && !U_FAILURE(*err)) 817 { 818 if (args->target >= args->targetLimit) 819 { 820 *err = U_BUFFER_OVERFLOW_ERROR; 821 break; 822 } 823 uniChar = *(args->source); 824 bytes_written = 0; 825 pLMBCS = LMBCS; 826 827 /* check cases in rough order of how common they are, for speed */ 828 829 /* single byte matches: strategy 1 */ 830 831 if (((uniChar > ULMBCS_C0END) && (uniChar < ULMBCS_C1START)) || 832 uniChar == 0 || uniChar == ULMBCS_HT || uniChar == ULMBCS_CR || 833 uniChar == ULMBCS_LF || uniChar == ULMBCS_123SYSTEMRANGE 834 ) 835 { 836 *pLMBCS++ = (ulmbcs_byte_t ) uniChar; 837 bytes_written = 1; 838 } 839 840 841 if (!bytes_written) 842 { 843 /* Check by UNICODE range (Strategy 2) */ 844 ulmbcs_byte_t group = FindLMBCSUniRange(uniChar); 845 846 if (group == ULMBCS_GRP_UNICODE) /* (Strategy 2A) */ 847 { 848 pLMBCS += LMBCSConvertUni(pLMBCS,uniChar); 849 850 bytes_written = pLMBCS - LMBCS; 851 } 852 else if (group == ULMBCS_GRP_CTRL) /* (Strategy 2B) */ 853 { 854 /* Handle control characters here */ 855 if (uniChar <= ULMBCS_C0END) 856 { 857 *pLMBCS++ = ULMBCS_GRP_CTRL; 858 *pLMBCS++ = (ulmbcs_byte_t)(ULMBCS_CTRLOFFSET + uniChar); 859 } 860 else if (uniChar >= ULMBCS_C1START && uniChar <= ULMBCS_C1START + ULMBCS_CTRLOFFSET) 861 { 862 *pLMBCS++ = ULMBCS_GRP_CTRL; 863 *pLMBCS++ = (ulmbcs_byte_t ) (uniChar & 0x00FF); 864 } 865 bytes_written = pLMBCS - LMBCS; 866 } 867 else if (group < ULMBCS_GRP_UNICODE) /* (Strategy 2C) */ 868 { 869 /* a specific converter has been identified - use it */ 870 bytes_written = LMBCSConversionWorker ( 871 extraInfo, group, pLMBCS, &uniChar, 872 &lastConverterIndex, groups_tried); 873 } 874 if (!bytes_written) /* the ambiguous group cases (Strategy 3) */ 875 { 876 uprv_memset(groups_tried, 0, sizeof(groups_tried)); 877 878 /* check for non-default optimization group (Strategy 3A )*/ 879 if (extraInfo->OptGroup != 1 880 && ULMBCS_AMBIGUOUS_MATCH(group, extraInfo->OptGroup)) 881 { 882 bytes_written = LMBCSConversionWorker (extraInfo, 883 extraInfo->OptGroup, pLMBCS, &uniChar, 884 &lastConverterIndex, groups_tried); 885 } 886 /* check for locale optimization group (Strategy 3B) */ 887 if (!bytes_written 888 && (extraInfo->localeConverterIndex) 889 && (ULMBCS_AMBIGUOUS_MATCH(group, extraInfo->localeConverterIndex))) 890 { 891 bytes_written = LMBCSConversionWorker (extraInfo, 892 extraInfo->localeConverterIndex, pLMBCS, &uniChar, 893 &lastConverterIndex, groups_tried); 894 } 895 /* check for last optimization group used for this string (Strategy 3C) */ 896 if (!bytes_written 897 && (lastConverterIndex) 898 && (ULMBCS_AMBIGUOUS_MATCH(group, lastConverterIndex))) 899 { 900 bytes_written = LMBCSConversionWorker (extraInfo, 901 lastConverterIndex, pLMBCS, &uniChar, 902 &lastConverterIndex, groups_tried); 903 904 } 905 if (!bytes_written) 906 { 907 /* just check every possible matching converter (Strategy 3D) */ 908 ulmbcs_byte_t grp_start; 909 ulmbcs_byte_t grp_end; 910 ulmbcs_byte_t grp_ix; 911 grp_start = (ulmbcs_byte_t)((group == ULMBCS_AMBIGUOUS_MBCS) 912 ? ULMBCS_DOUBLEOPTGROUP_START 913 : ULMBCS_GRP_L1); 914 grp_end = (ulmbcs_byte_t)((group == ULMBCS_AMBIGUOUS_MBCS) 915 ? ULMBCS_GRP_LAST 916 : ULMBCS_GRP_TH); 917 for (grp_ix = grp_start; 918 grp_ix <= grp_end && !bytes_written; 919 grp_ix++) 920 { 921 if (extraInfo->OptGrpConverter [grp_ix] && !groups_tried [grp_ix]) 922 { 923 bytes_written = LMBCSConversionWorker (extraInfo, 924 grp_ix, pLMBCS, &uniChar, 925 &lastConverterIndex, groups_tried); 926 } 927 } 928 /* a final conversion fallback to the exceptions group if its likely 929 to be single byte (Strategy 3E) */ 930 if (!bytes_written && grp_start == ULMBCS_GRP_L1) 931 { 932 bytes_written = LMBCSConversionWorker (extraInfo, 933 ULMBCS_GRP_EXCEPT, pLMBCS, &uniChar, 934 &lastConverterIndex, groups_tried); 935 } 936 } 937 /* all of our other strategies failed. Fallback to Unicode. (Strategy 4)*/ 938 if (!bytes_written) 939 { 940 941 pLMBCS += LMBCSConvertUni(pLMBCS, uniChar); 942 bytes_written = pLMBCS - LMBCS; 943 } 944 } 945 } 946 947 /* we have a translation. increment source and write as much as posible to target */ 948 args->source++; 949 pLMBCS = LMBCS; 950 while (args->target < args->targetLimit && bytes_written--) 951 { 952 *(args->target)++ = *pLMBCS++; 953 if (args->offsets) 954 { 955 *(args->offsets)++ = sourceIndex; 956 } 957 } 958 sourceIndex++; 959 if (bytes_written > 0) 960 { 961 /* write any bytes that didn't fit in target to the error buffer, 962 common code will move this to target if we get called back with 963 enough target room 964 */ 965 uint8_t * pErrorBuffer = args->converter->charErrorBuffer; 966 *err = U_BUFFER_OVERFLOW_ERROR; 967 args->converter->charErrorBufferLength = (int8_t)bytes_written; 968 while (bytes_written--) 969 { 970 *pErrorBuffer++ = *pLMBCS++; 971 } 972 } 973 } 974} 975 976 977/* Now, the Unicode from LMBCS section */ 978 979 980/* A function to call when we are looking at the Unicode group byte in LMBCS */ 981static UChar 982GetUniFromLMBCSUni(char const ** ppLMBCSin) /* Called with LMBCS-style Unicode byte stream */ 983{ 984 uint8_t HighCh = *(*ppLMBCSin)++; /* Big-endian Unicode in LMBCS compatibility group*/ 985 uint8_t LowCh = *(*ppLMBCSin)++; 986 987 if (HighCh == ULMBCS_UNICOMPATZERO ) 988 { 989 HighCh = LowCh; 990 LowCh = 0; /* zero-byte in LSB special character */ 991 } 992 return (UChar)((HighCh << 8) | LowCh); 993} 994 995 996 997/* CHECK_SOURCE_LIMIT: Helper macro to verify that there are at least'index' 998 bytes left in source up to sourceLimit.Errors appropriately if not. 999 If we reach the limit, then update the source pointer to there to consume 1000 all input as required by ICU converter semantics. 1001*/ 1002 1003#define CHECK_SOURCE_LIMIT(index) \ 1004 if (args->source+index > args->sourceLimit){\ 1005 *err = U_TRUNCATED_CHAR_FOUND;\ 1006 args->source = args->sourceLimit;\ 1007 return 0xffff;} 1008 1009/* Return the Unicode representation for the current LMBCS character */ 1010 1011static UChar32 1012_LMBCSGetNextUCharWorker(UConverterToUnicodeArgs* args, 1013 UErrorCode* err) 1014{ 1015 UChar32 uniChar = 0; /* an output UNICODE char */ 1016 ulmbcs_byte_t CurByte; /* A byte from the input stream */ 1017 1018 /* error check */ 1019 if (args->source >= args->sourceLimit) 1020 { 1021 *err = U_ILLEGAL_ARGUMENT_ERROR; 1022 return 0xffff; 1023 } 1024 /* Grab first byte & save address for error recovery */ 1025 CurByte = *((ulmbcs_byte_t *) (args->source++)); 1026 1027 /* 1028 * at entry of each if clause: 1029 * 1. 'CurByte' points at the first byte of a LMBCS character 1030 * 2. '*source'points to the next byte of the source stream after 'CurByte' 1031 * 1032 * the job of each if clause is: 1033 * 1. set '*source' to point at the beginning of next char (nop if LMBCS char is only 1 byte) 1034 * 2. set 'uniChar' up with the right Unicode value, or set 'err' appropriately 1035 */ 1036 1037 /* First lets check the simple fixed values. */ 1038 1039 if(((CurByte > ULMBCS_C0END) && (CurByte < ULMBCS_C1START)) /* ascii range */ 1040 || (CurByte == 0) 1041 || CurByte == ULMBCS_HT || CurByte == ULMBCS_CR 1042 || CurByte == ULMBCS_LF || CurByte == ULMBCS_123SYSTEMRANGE) 1043 { 1044 uniChar = CurByte; 1045 } 1046 else 1047 { 1048 UConverterDataLMBCS * extraInfo; 1049 ulmbcs_byte_t group; 1050 UConverterSharedData *cnv; 1051 1052 if (CurByte == ULMBCS_GRP_CTRL) /* Control character group - no opt group update */ 1053 { 1054 ulmbcs_byte_t C0C1byte; 1055 CHECK_SOURCE_LIMIT(1); 1056 C0C1byte = *(args->source)++; 1057 uniChar = (C0C1byte < ULMBCS_C1START) ? C0C1byte - ULMBCS_CTRLOFFSET : C0C1byte; 1058 } 1059 else 1060 if (CurByte == ULMBCS_GRP_UNICODE) /* Unicode compatibility group: BigEndian UTF16 */ 1061 { 1062 CHECK_SOURCE_LIMIT(2); 1063 1064 /* don't check for error indicators fffe/ffff below */ 1065 return GetUniFromLMBCSUni(&(args->source)); 1066 } 1067 else if (CurByte <= ULMBCS_CTRLOFFSET) 1068 { 1069 group = CurByte; /* group byte is in the source */ 1070 extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo; 1071 if (group > ULMBCS_GRP_LAST || (cnv = extraInfo->OptGrpConverter[group]) == NULL) 1072 { 1073 /* this is not a valid group byte - no converter*/ 1074 *err = U_INVALID_CHAR_FOUND; 1075 } 1076 else if (group >= ULMBCS_DOUBLEOPTGROUP_START) /* double byte conversion */ 1077 { 1078 1079 CHECK_SOURCE_LIMIT(2); 1080 1081 /* check for LMBCS doubled-group-byte case */ 1082 if (*args->source == group) { 1083 /* single byte */ 1084 ++args->source; 1085 uniChar = ucnv_MBCSSimpleGetNextUChar(cnv, args->source, 1, FALSE); 1086 ++args->source; 1087 } else { 1088 /* double byte */ 1089 uniChar = ucnv_MBCSSimpleGetNextUChar(cnv, args->source, 2, FALSE); 1090 args->source += 2; 1091 } 1092 } 1093 else { /* single byte conversion */ 1094 CHECK_SOURCE_LIMIT(1); 1095 CurByte = *(args->source)++; 1096 1097 if (CurByte >= ULMBCS_C1START) 1098 { 1099 uniChar = _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv, CurByte); 1100 } 1101 else 1102 { 1103 /* The non-optimizable oddballs where there is an explicit byte 1104 * AND the second byte is not in the upper ascii range 1105 */ 1106 char bytes[2]; 1107 1108 extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo; 1109 cnv = extraInfo->OptGrpConverter [ULMBCS_GRP_EXCEPT]; 1110 1111 /* Lookup value must include opt group */ 1112 bytes[0] = group; 1113 bytes[1] = CurByte; 1114 uniChar = ucnv_MBCSSimpleGetNextUChar(cnv, bytes, 2, FALSE); 1115 } 1116 } 1117 } 1118 else if (CurByte >= ULMBCS_C1START) /* group byte is implicit */ 1119 { 1120 extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo; 1121 group = extraInfo->OptGroup; 1122 cnv = extraInfo->OptGrpConverter[group]; 1123 if (group >= ULMBCS_DOUBLEOPTGROUP_START) /* double byte conversion */ 1124 { 1125 if (!ucnv_MBCSIsLeadByte(cnv, CurByte)) 1126 { 1127 CHECK_SOURCE_LIMIT(0); 1128 1129 /* let the MBCS conversion consume CurByte again */ 1130 uniChar = ucnv_MBCSSimpleGetNextUChar(cnv, args->source - 1, 1, FALSE); 1131 } 1132 else 1133 { 1134 CHECK_SOURCE_LIMIT(1); 1135 /* let the MBCS conversion consume CurByte again */ 1136 uniChar = ucnv_MBCSSimpleGetNextUChar(cnv, args->source - 1, 2, FALSE); 1137 ++args->source; 1138 } 1139 } 1140 else /* single byte conversion */ 1141 { 1142 uniChar = _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv, CurByte); 1143 } 1144 } 1145 } 1146 return uniChar; 1147} 1148 1149 1150/* The exported function that converts lmbcs to one or more 1151 UChars - currently UTF-16 1152*/ 1153static void 1154_LMBCSToUnicodeWithOffsets(UConverterToUnicodeArgs* args, 1155 UErrorCode* err) 1156{ 1157 char LMBCS [ULMBCS_CHARSIZE_MAX]; 1158 UChar uniChar; /* one output UNICODE char */ 1159 const char * saveSource; /* beginning of current code point */ 1160 const char * pStartLMBCS = args->source; /* beginning of whole string */ 1161 const char * errSource = NULL; /* pointer to actual input in case an error occurs */ 1162 int8_t savebytes = 0; 1163 1164 /* Process from source to limit, or until error */ 1165 while (U_SUCCESS(*err) && args->sourceLimit > args->source && args->targetLimit > args->target) 1166 { 1167 saveSource = args->source; /* beginning of current code point */ 1168 1169 if (args->converter->toULength) /* reassemble char from previous call */ 1170 { 1171 const char *saveSourceLimit; 1172 size_t size_old = args->converter->toULength; 1173 1174 /* limit from source is either remainder of temp buffer, or user limit on source */ 1175 size_t size_new_maybe_1 = sizeof(LMBCS) - size_old; 1176 size_t size_new_maybe_2 = args->sourceLimit - args->source; 1177 size_t size_new = (size_new_maybe_1 < size_new_maybe_2) ? size_new_maybe_1 : size_new_maybe_2; 1178 1179 1180 uprv_memcpy(LMBCS, args->converter->toUBytes, size_old); 1181 uprv_memcpy(LMBCS + size_old, args->source, size_new); 1182 saveSourceLimit = args->sourceLimit; 1183 args->source = errSource = LMBCS; 1184 args->sourceLimit = LMBCS+size_old+size_new; 1185 savebytes = (int8_t)(size_old+size_new); 1186 uniChar = (UChar) _LMBCSGetNextUCharWorker(args, err); 1187 args->source = saveSource + ((args->source - LMBCS) - size_old); 1188 args->sourceLimit = saveSourceLimit; 1189 1190 if (*err == U_TRUNCATED_CHAR_FOUND) 1191 { 1192 /* evil special case: source buffers so small a char spans more than 2 buffers */ 1193 args->converter->toULength = savebytes; 1194 uprv_memcpy(args->converter->toUBytes, LMBCS, savebytes); 1195 args->source = args->sourceLimit; 1196 *err = U_ZERO_ERROR; 1197 return; 1198 } 1199 else 1200 { 1201 /* clear the partial-char marker */ 1202 args->converter->toULength = 0; 1203 } 1204 } 1205 else 1206 { 1207 errSource = saveSource; 1208 uniChar = (UChar) _LMBCSGetNextUCharWorker(args, err); 1209 savebytes = (int8_t)(args->source - saveSource); 1210 } 1211 if (U_SUCCESS(*err)) 1212 { 1213 if (uniChar < 0xfffe) 1214 { 1215 *(args->target)++ = uniChar; 1216 if(args->offsets) 1217 { 1218 *(args->offsets)++ = saveSource - pStartLMBCS; 1219 } 1220 } 1221 else if (uniChar == 0xfffe) 1222 { 1223 *err = U_INVALID_CHAR_FOUND; 1224 } 1225 else /* if (uniChar == 0xffff) */ 1226 { 1227 *err = U_ILLEGAL_CHAR_FOUND; 1228 } 1229 } 1230 } 1231 /* if target ran out before source, return U_BUFFER_OVERFLOW_ERROR */ 1232 if (U_SUCCESS(*err) && args->sourceLimit > args->source && args->targetLimit <= args->target) 1233 { 1234 *err = U_BUFFER_OVERFLOW_ERROR; 1235 } 1236 else if (U_FAILURE(*err)) 1237 { 1238 /* If character incomplete or unmappable/illegal, store it in toUBytes[] */ 1239 args->converter->toULength = savebytes; 1240 if (savebytes > 0) { 1241 uprv_memcpy(args->converter->toUBytes, errSource, savebytes); 1242 } 1243 if (*err == U_TRUNCATED_CHAR_FOUND) { 1244 *err = U_ZERO_ERROR; 1245 } 1246 } 1247} 1248 1249/* And now, the macroized declarations of data & functions: */ 1250DEFINE_LMBCS_OPEN(1) 1251DEFINE_LMBCS_OPEN(2) 1252DEFINE_LMBCS_OPEN(3) 1253DEFINE_LMBCS_OPEN(4) 1254DEFINE_LMBCS_OPEN(5) 1255DEFINE_LMBCS_OPEN(6) 1256DEFINE_LMBCS_OPEN(8) 1257DEFINE_LMBCS_OPEN(11) 1258DEFINE_LMBCS_OPEN(16) 1259DEFINE_LMBCS_OPEN(17) 1260DEFINE_LMBCS_OPEN(18) 1261DEFINE_LMBCS_OPEN(19) 1262 1263 1264DECLARE_LMBCS_DATA(1) 1265DECLARE_LMBCS_DATA(2) 1266DECLARE_LMBCS_DATA(3) 1267DECLARE_LMBCS_DATA(4) 1268DECLARE_LMBCS_DATA(5) 1269DECLARE_LMBCS_DATA(6) 1270DECLARE_LMBCS_DATA(8) 1271DECLARE_LMBCS_DATA(11) 1272DECLARE_LMBCS_DATA(16) 1273DECLARE_LMBCS_DATA(17) 1274DECLARE_LMBCS_DATA(18) 1275DECLARE_LMBCS_DATA(19) 1276 1277#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */ 1278