icuSources/tools/makeconv/genmbcs.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 2000-2013, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  genmbcs.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2000jul06
  14 *   created by: Markus W. Scherer
  15 */
  16
  17 #include <stdio.h>
  18 #include "unicode/utypes.h"
  19 #include "cstring.h"
  20 #include "cmemory.h"
  21 #include "unewdata.h"
  22 #include "ucnv_cnv.h"
  23 #include "ucnvmbcs.h"
  24 #include "ucm.h"
  25 #include "makeconv.h"
  26 #include "genmbcs.h"
  27
  28 /*
  29  * TODO: Split this file into toUnicode, SBCSFromUnicode and MBCSFromUnicode files.
  30  * Reduce tests for maxCharLength.
  31  */
  32
  33 struct MBCSData {
  34     NewConverter newConverter;
  35
  36     UCMFile *ucm;
  37
  38     /* toUnicode (state table in ucm->states) */
  39     _MBCSToUFallback toUFallbacks[MBCS_MAX_FALLBACK_COUNT];
  40     int32_t countToUFallbacks;
  41     uint16_t *unicodeCodeUnits;
  42
  43     /* fromUnicode */
  44     uint16_t stage1[MBCS_STAGE_1_SIZE];
  45     uint16_t stage2Single[MBCS_STAGE_2_SIZE]; /* stage 2 for single-byte codepages */
  46     uint32_t stage2[MBCS_STAGE_2_SIZE]; /* stage 2 for MBCS */
  47     uint8_t *fromUBytes;
  48     uint32_t stage2Top, stage3Top;
  49
  50     /* fromUTF8 */
  51     uint16_t stageUTF8[0x10000>>MBCS_UTF8_STAGE_SHIFT];  /* allow for utf8Max=0xffff */
  52
  53     /*
  54      * Maximum UTF-8-friendly code point.
  55      * 0 if !utf8Friendly, otherwise 0x01ff..0xffff in steps of 0x100.
  56      * If utf8Friendly, utf8Max is normally either MBCS_UTF8_MAX or 0xffff.
  57      */
  58     uint16_t utf8Max;
  59
  60     UBool utf8Friendly;
  61     UBool omitFromU;
  62 };
  63
  64 /* prototypes */
  65 static void
  66 MBCSClose(NewConverter *cnvData);
  67
  68 static UBool
  69 MBCSStartMappings(MBCSData *mbcsData);
  70
  71 static UBool
  72 MBCSAddToUnicode(MBCSData *mbcsData,
  73                  const uint8_t *bytes, int32_t length,
  74                  UChar32 c,
  75                  int8_t flag);
  76
  77 static UBool
  78 MBCSIsValid(NewConverter *cnvData,
  79             const uint8_t *bytes, int32_t length);
  80
  81 static UBool
  82 MBCSSingleAddFromUnicode(MBCSData *mbcsData,
  83                          const uint8_t *bytes, int32_t length,
  84                          UChar32 c,
  85                          int8_t flag);
  86
  87 static UBool
  88 MBCSAddFromUnicode(MBCSData *mbcsData,
  89                    const uint8_t *bytes, int32_t length,
  90                    UChar32 c,
  91                    int8_t flag);
  92
  93 static void
  94 MBCSPostprocess(MBCSData *mbcsData, const UConverterStaticData *staticData);
  95
  96 static UBool
  97 MBCSAddTable(NewConverter *cnvData, UCMTable *table, UConverterStaticData *staticData);
  98
  99 static uint32_t
 100 MBCSWrite(NewConverter *cnvData, const UConverterStaticData *staticData,
 101           UNewDataMemory *pData, int32_t tableType);
 102
 103 /* helper ------------------------------------------------------------------- */
 104
 105 static inline char
 106 hexDigit(uint8_t digit) {
 107     return digit<=9 ? (char)('0'+digit) : (char)('a'-10+digit);
 108 }
 109
 110 static inline char *
 111 printBytes(char *buffer, const uint8_t *bytes, int32_t length) {
 112     char *s=buffer;
 113     while(length>0) {
 114         *s++=hexDigit((uint8_t)(*bytes>>4));
 115         *s++=hexDigit((uint8_t)(*bytes&0xf));
 116         ++bytes;
 117         --length;
 118     }
 119
 120     *s=0;
 121     return buffer;
 122 }
 123
 124 /* implementation ----------------------------------------------------------- */
 125
 126 static MBCSData gDummy;
 127
 128 U_CFUNC const MBCSData *
 129 MBCSGetDummy() {
 130     uprv_memset(&gDummy, 0, sizeof(MBCSData));
 131
 132     /*
 133      * Set "pessimistic" values which may sometimes move too many
 134      * mappings to the extension table (but never too few).
 135      * These values cause MBCSOkForBaseFromUnicode() to return FALSE for the
 136      * largest set of mappings.
 137      * Assume maxCharLength>1.
 138      */
 139     gDummy.utf8Friendly=TRUE;
 140     if(SMALL) {
 141         gDummy.utf8Max=0xffff;
 142         gDummy.omitFromU=TRUE;
 143     } else {
 144         gDummy.utf8Max=MBCS_UTF8_MAX;
 145     }
 146     return &gDummy;
 147 }
 148
 149 static void
 150 MBCSInit(MBCSData *mbcsData, UCMFile *ucm) {
 151     uprv_memset(mbcsData, 0, sizeof(MBCSData));
 152
 153     mbcsData->ucm=ucm; /* aliased, not owned */
 154
 155     mbcsData->newConverter.close=MBCSClose;
 156     mbcsData->newConverter.isValid=MBCSIsValid;
 157     mbcsData->newConverter.addTable=MBCSAddTable;
 158     mbcsData->newConverter.write=MBCSWrite;
 159 }
 160
 161 NewConverter *
 162 MBCSOpen(UCMFile *ucm) {
 163     MBCSData *mbcsData=(MBCSData *)uprv_malloc(sizeof(MBCSData));
 164     if(mbcsData==NULL) {
 165         printf("out of memory\n");
 166         exit(U_MEMORY_ALLOCATION_ERROR);
 167     }
 168
 169     MBCSInit(mbcsData, ucm);
 170     return &mbcsData->newConverter;
 171 }
 172
 173 static void
 174 MBCSDestruct(MBCSData *mbcsData) {
 175     uprv_free(mbcsData->unicodeCodeUnits);
 176     uprv_free(mbcsData->fromUBytes);
 177 }
 178
 179 static void
 180 MBCSClose(NewConverter *cnvData) {
 181     MBCSData *mbcsData=(MBCSData *)cnvData;
 182     if(mbcsData!=NULL) {
 183         MBCSDestruct(mbcsData);
 184         uprv_free(mbcsData);
 185     }
 186 }
 187
 188 static UBool
 189 MBCSStartMappings(MBCSData *mbcsData) {
 190     int32_t i, sum, maxCharLength,
 191             stage2NullLength, stage2AllocLength,
 192             stage3NullLength, stage3AllocLength;
 193
 194     /* toUnicode */
 195
 196     /* allocate the code unit array and prefill it with "unassigned" values */
 197     sum=mbcsData->ucm->states.countToUCodeUnits;
 198     if(VERBOSE) {
 199         printf("the total number of offsets is 0x%lx=%ld\n", (long)sum, (long)sum);
 200     }
 201
 202     if(sum>0) {
 203         mbcsData->unicodeCodeUnits=(uint16_t *)uprv_malloc(sum*sizeof(uint16_t));
 204         if(mbcsData->unicodeCodeUnits==NULL) {
 205             fprintf(stderr, "error: out of memory allocating %ld 16-bit code units\n",
 206                 (long)sum);
 207             return FALSE;
 208         }
 209         for(i=0; i<sum; ++i) {
 210             mbcsData->unicodeCodeUnits[i]=0xfffe;
 211         }
 212     }
 213
 214     /* fromUnicode */
 215     maxCharLength=mbcsData->ucm->states.maxCharLength;
 216
 217     /* allocate the codepage mappings and preset the first 16 characters to 0 */
 218     if(maxCharLength==1) {
 219         /* allocate 64k 16-bit results for single-byte codepages */
 220         sum=0x20000;
 221     } else {
 222         /* allocate 1M * maxCharLength bytes for at most 1M mappings */
 223         sum=0x100000*maxCharLength;
 224     }
 225     mbcsData->fromUBytes=(uint8_t *)uprv_malloc(sum);
 226     if(mbcsData->fromUBytes==NULL) {
 227         fprintf(stderr, "error: out of memory allocating %ld B for target mappings\n", (long)sum);
 228         return FALSE;
 229     }
 230     uprv_memset(mbcsData->fromUBytes, 0, sum);
 231
 232     /*
 233      * UTF-8-friendly fromUnicode tries: allocate multiple blocks at a time.
 234      * See ucnvmbcs.h for details.
 235      *
 236      * There is code, for example in ucnv_MBCSGetUnicodeSetForUnicode(), which
 237      * assumes that the initial stage 2/3 blocks are the all-unassigned ones.
 238      * Therefore, we refine the data structure while maintaining this placement
 239      * even though it would be convenient to allocate the ASCII block at the
 240      * beginning of stage 3, for example.
 241      *
 242      * UTF-8-friendly fromUnicode tries work from sorted tables and are built
 243      * pre-compacted, overlapping adjacent stage 2/3 blocks.
 244      * This is necessary because the block allocation and compaction changes
 245      * at SBCS_UTF8_MAX or MBCS_UTF8_MAX, and for MBCS tables the additional
 246      * stage table uses direct indexes into stage 3, without a multiplier and
 247      * thus with a smaller reach.
 248      *
 249      * Non-UTF-8-friendly fromUnicode tries work from unsorted tables
 250      * (because implicit precision is used), and are compacted
 251      * in post-processing.
 252      *
 253      * Preallocation for UTF-8-friendly fromUnicode tries:
 254      *
 255      * Stage 3:
 256      * 64-entry all-unassigned first block followed by ASCII (128 entries).
 257      *
 258      * Stage 2:
 259      * 64-entry all-unassigned first block followed by preallocated
 260      * 64-block for ASCII.
 261      */
 262
 263     /* Preallocate ASCII as a linear 128-entry stage 3 block. */
 264     stage2NullLength=MBCS_STAGE_2_BLOCK_SIZE;
 265     stage2AllocLength=MBCS_STAGE_2_BLOCK_SIZE;
 266
 267     stage3NullLength=MBCS_UTF8_STAGE_3_BLOCK_SIZE;
 268     stage3AllocLength=128; /* ASCII U+0000..U+007f */
 269
 270     /* Initialize stage 1 for the preallocated blocks. */
 271     sum=stage2NullLength;
 272     for(i=0; i<(stage2AllocLength>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT); ++i) {
 273         mbcsData->stage1[i]=sum;
 274         sum+=MBCS_STAGE_2_BLOCK_SIZE;
 275     }
 276     mbcsData->stage2Top=stage2NullLength+stage2AllocLength; /* ==sum */
 277
 278     /*
 279      * Stage 2 indexes count 16-blocks in stage 3 as follows:
 280      * SBCS: directly, indexes increment by 16
 281      * MBCS: indexes need to be multiplied by 16*maxCharLength, indexes increment by 1
 282      * MBCS UTF-8: directly, indexes increment by 16
 283      */
 284     if(maxCharLength==1) {
 285         sum=stage3NullLength;
 286         for(i=0; i<(stage3AllocLength/MBCS_STAGE_3_BLOCK_SIZE); ++i) {
 287             mbcsData->stage2Single[mbcsData->stage1[0]+i]=sum;
 288             sum+=MBCS_STAGE_3_BLOCK_SIZE;
 289         }
 290     } else {
 291         sum=stage3NullLength/MBCS_STAGE_3_GRANULARITY;
 292         for(i=0; i<(stage3AllocLength/MBCS_STAGE_3_BLOCK_SIZE); ++i) {
 293             mbcsData->stage2[mbcsData->stage1[0]+i]=sum;
 294             sum+=MBCS_STAGE_3_BLOCK_SIZE/MBCS_STAGE_3_GRANULARITY;
 295         }
 296     }
 297
 298     sum=stage3NullLength;
 299     for(i=0; i<(stage3AllocLength/MBCS_UTF8_STAGE_3_BLOCK_SIZE); ++i) {
 300         mbcsData->stageUTF8[i]=sum;
 301         sum+=MBCS_UTF8_STAGE_3_BLOCK_SIZE;
 302     }
 303
 304     /*
 305      * Allocate a 64-entry all-unassigned first stage 3 block,
 306      * for UTF-8-friendly lookup with a trail byte,
 307      * plus 128 entries for ASCII.
 308      */
 309     mbcsData->stage3Top=(stage3NullLength+stage3AllocLength)*maxCharLength; /* ==sum*maxCharLength */
 310
 311     return TRUE;
 312 }
 313
 314 /* return TRUE for success */
 315 static UBool
 316 setFallback(MBCSData *mbcsData, uint32_t offset, UChar32 c) {
 317     int32_t i=ucm_findFallback(mbcsData->toUFallbacks, mbcsData->countToUFallbacks, offset);
 318     if(i>=0) {
 319         /* if there is already a fallback for this offset, then overwrite it */
 320         mbcsData->toUFallbacks[i].codePoint=c;
 321         return TRUE;
 322     } else {
 323         /* if there is no fallback for this offset, then add one */
 324         i=mbcsData->countToUFallbacks;
 325         if(i>=MBCS_MAX_FALLBACK_COUNT) {
 326             fprintf(stderr, "error: too many toUnicode fallbacks, currently at: U+%x\n", (int)c);
 327             return FALSE;
 328         } else {
 329             mbcsData->toUFallbacks[i].offset=offset;
 330             mbcsData->toUFallbacks[i].codePoint=c;
 331             mbcsData->countToUFallbacks=i+1;
 332             return TRUE;
 333         }
 334     }
 335 }
 336
 337 /* remove fallback if there is one with this offset; return the code point if there was such a fallback, otherwise -1 */
 338 static int32_t
 339 removeFallback(MBCSData *mbcsData, uint32_t offset) {
 340     int32_t i=ucm_findFallback(mbcsData->toUFallbacks, mbcsData->countToUFallbacks, offset);
 341     if(i>=0) {
 342         _MBCSToUFallback *toUFallbacks;
 343         int32_t limit, old;
 344
 345         toUFallbacks=mbcsData->toUFallbacks;
 346         limit=mbcsData->countToUFallbacks;
 347         old=(int32_t)toUFallbacks[i].codePoint;
 348
 349         /* copy the last fallback entry here to keep the list contiguous */
 350         toUFallbacks[i].offset=toUFallbacks[limit-1].offset;
 351         toUFallbacks[i].codePoint=toUFallbacks[limit-1].codePoint;
 352         mbcsData->countToUFallbacks=limit-1;
 353         return old;
 354     } else {
 355         return -1;
 356     }
 357 }
 358
 359 /*
 360  * isFallback is almost a boolean:
 361  * 1 (TRUE)  this is a fallback mapping
 362  * 0 (FALSE) this is a precise mapping
 363  * -1        the precision of this mapping is not specified
 364  */
 365 static UBool
 366 MBCSAddToUnicode(MBCSData *mbcsData,
 367                  const uint8_t *bytes, int32_t length,
 368                  UChar32 c,
 369                  int8_t flag) {
 370     char buffer[10];
 371     uint32_t offset=0;
 372     int32_t i=0, entry, old;
 373     uint8_t state=0;
 374
 375     if(mbcsData->ucm->states.countStates==0) {
 376         fprintf(stderr, "error: there is no state information!\n");
 377         return FALSE;
 378     }
 379
 380     /* for SI/SO (like EBCDIC-stateful), double-byte sequences start in state 1 */
 381     if(length==2 && mbcsData->ucm->states.outputType==MBCS_OUTPUT_2_SISO) {
 382         state=1;
 383     }
 384
 385     /*
 386      * Walk down the state table like in conversion,
 387      * much like getNextUChar().
 388      * We assume that c<=0x10ffff.
 389      */
 390     for(i=0;;) {
 391         entry=mbcsData->ucm->states.stateTable[state][bytes[i++]];
 392         if(MBCS_ENTRY_IS_TRANSITION(entry)) {
 393             if(i==length) {
 394                 fprintf(stderr, "error: byte sequence too short, ends in non-final state %hu: 0x%s (U+%x)\n",
 395                     (short)state, printBytes(buffer, bytes, length), (int)c);
 396                 return FALSE;
 397             }
 398             state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
 399             offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry);
 400         } else {
 401             if(i<length) {
 402                 fprintf(stderr, "error: byte sequence too long by %d bytes, final state %u: 0x%s (U+%x)\n",
 403                     (int)(length-i), state, printBytes(buffer, bytes, length), (int)c);
 404                 return FALSE;
 405             }
 406             switch(MBCS_ENTRY_FINAL_ACTION(entry)) {
 407             case MBCS_STATE_ILLEGAL:
 408                 fprintf(stderr, "error: byte sequence ends in illegal state at U+%04x<->0x%s\n",
 409                     (int)c, printBytes(buffer, bytes, length));
 410                 return FALSE;
 411             case MBCS_STATE_CHANGE_ONLY:
 412                 fprintf(stderr, "error: byte sequence ends in state-change-only at U+%04x<->0x%s\n",
 413                     (int)c, printBytes(buffer, bytes, length));
 414                 return FALSE;
 415             case MBCS_STATE_UNASSIGNED:
 416                 fprintf(stderr, "error: byte sequence ends in unassigned state at U+%04x<->0x%s\n",
 417                     (int)c, printBytes(buffer, bytes, length));
 418                 return FALSE;
 419             case MBCS_STATE_FALLBACK_DIRECT_16:
 420             case MBCS_STATE_VALID_DIRECT_16:
 421             case MBCS_STATE_FALLBACK_DIRECT_20:
 422             case MBCS_STATE_VALID_DIRECT_20:
 423                 if(MBCS_ENTRY_SET_STATE(entry, 0)!=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, 0xfffe)) {
 424                     /* the "direct" action's value is not "valid-direct-16-unassigned" any more */
 425                     if(MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_DIRECT_16 || MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_FALLBACK_DIRECT_16) {
 426                         old=MBCS_ENTRY_FINAL_VALUE(entry);
 427                     } else {
 428                         old=0x10000+MBCS_ENTRY_FINAL_VALUE(entry);
 429                     }
 430                     if(flag>=0) {
 431                         fprintf(stderr, "error: duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 432                             (int)c, printBytes(buffer, bytes, length), (int)old);
 433                         return FALSE;
 434                     } else if(VERBOSE) {
 435                         fprintf(stderr, "duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 436                             (int)c, printBytes(buffer, bytes, length), (int)old);
 437                     }
 438                     /*
 439                      * Continue after the above warning
 440                      * if the precision of the mapping is unspecified.
 441                      */
 442                 }
 443                 /* reassign the correct action code */
 444                 entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, (MBCS_STATE_VALID_DIRECT_16+(flag==3 ? 2 : 0)+(c>=0x10000 ? 1 : 0)));
 445
 446                 /* put the code point into bits 22..7 for BMP, c-0x10000 into 26..7 for others */
 447                 if(c<=0xffff) {
 448                     entry=MBCS_ENTRY_FINAL_SET_VALUE(entry, c);
 449                 } else {
 450                     entry=MBCS_ENTRY_FINAL_SET_VALUE(entry, c-0x10000);
 451                 }
 452                 mbcsData->ucm->states.stateTable[state][bytes[i-1]]=entry;
 453                 break;
 454             case MBCS_STATE_VALID_16:
 455                 /* bits 26..16 are not used, 0 */
 456                 /* bits 15..7 contain the final offset delta to one 16-bit code unit */
 457                 offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
 458                 /* check that this byte sequence is still unassigned */
 459                 if((old=mbcsData->unicodeCodeUnits[offset])!=0xfffe || (old=removeFallback(mbcsData, offset))!=-1) {
 460                     if(flag>=0) {
 461                         fprintf(stderr, "error: duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 462                             (int)c, printBytes(buffer, bytes, length), (int)old);
 463                         return FALSE;
 464                     } else if(VERBOSE) {
 465                         fprintf(stderr, "duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 466                             (int)c, printBytes(buffer, bytes, length), (int)old);
 467                     }
 468                 }
 469                 if(c>=0x10000) {
 470                     fprintf(stderr, "error: code point does not fit into valid-16-bit state at U+%04x<->0x%s\n",
 471                         (int)c, printBytes(buffer, bytes, length));
 472                     return FALSE;
 473                 }
 474                 if(flag>0) {
 475                     /* assign only if there is no precise mapping */
 476                     if(mbcsData->unicodeCodeUnits[offset]==0xfffe) {
 477                         return setFallback(mbcsData, offset, c);
 478                     }
 479                 } else {
 480                     mbcsData->unicodeCodeUnits[offset]=(uint16_t)c;
 481                 }
 482                 break;
 483             case MBCS_STATE_VALID_16_PAIR:
 484                 /* bits 26..16 are not used, 0 */
 485                 /* bits 15..7 contain the final offset delta to two 16-bit code units */
 486                 offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
 487                 /* check that this byte sequence is still unassigned */
 488                 old=mbcsData->unicodeCodeUnits[offset];
 489                 if(old<0xfffe) {
 490                     int32_t real;
 491                     if(old<0xd800) {
 492                         real=old;
 493                     } else if(old<=0xdfff) {
 494                         real=0x10000+((old&0x3ff)<<10)+((mbcsData->unicodeCodeUnits[offset+1])&0x3ff);
 495                     } else /* old<=0xe001 */ {
 496                         real=mbcsData->unicodeCodeUnits[offset+1];
 497                     }
 498                     if(flag>=0) {
 499                         fprintf(stderr, "error: duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 500                             (int)c, printBytes(buffer, bytes, length), (int)real);
 501                         return FALSE;
 502                     } else if(VERBOSE) {
 503                         fprintf(stderr, "duplicate codepage byte sequence at U+%04x<->0x%s see U+%04x\n",
 504                             (int)c, printBytes(buffer, bytes, length), (int)real);
 505                     }
 506                 }
 507                 if(flag>0) {
 508                     /* assign only if there is no precise mapping */
 509                     if(old<=0xdbff || old==0xe000) {
 510                         /* do nothing */
 511                     } else if(c<=0xffff) {
 512                         /* set a BMP fallback code point as a pair with 0xe001 */
 513                         mbcsData->unicodeCodeUnits[offset++]=0xe001;
 514                         mbcsData->unicodeCodeUnits[offset]=(uint16_t)c;
 515                     } else {
 516                         /* set a fallback surrogate pair with two second surrogates */
 517                         mbcsData->unicodeCodeUnits[offset++]=(uint16_t)(0xdbc0+(c>>10));
 518                         mbcsData->unicodeCodeUnits[offset]=(uint16_t)(0xdc00+(c&0x3ff));
 519                     }
 520                 } else {
 521                     if(c<0xd800) {
 522                         /* set a BMP code point */
 523                         mbcsData->unicodeCodeUnits[offset]=(uint16_t)c;
 524                     } else if(c<=0xffff) {
 525                         /* set a BMP code point above 0xd800 as a pair with 0xe000 */
 526                         mbcsData->unicodeCodeUnits[offset++]=0xe000;
 527                         mbcsData->unicodeCodeUnits[offset]=(uint16_t)c;
 528                     } else {
 529                         /* set a surrogate pair */
 530                         mbcsData->unicodeCodeUnits[offset++]=(uint16_t)(0xd7c0+(c>>10));
 531                         mbcsData->unicodeCodeUnits[offset]=(uint16_t)(0xdc00+(c&0x3ff));
 532                     }
 533                 }
 534                 break;
 535             default:
 536                 /* reserved, must never occur */
 537                 fprintf(stderr, "internal error: byte sequence reached reserved action code, entry 0x%02x: 0x%s (U+%x)\n",
 538                     (int)entry, printBytes(buffer, bytes, length), (int)c);
 539                 return FALSE;
 540             }
 541
 542             return TRUE;
 543         }
 544     }
 545 }
 546
 547 /* is this byte sequence valid? (this is almost the same as MBCSAddToUnicode()) */
 548 static UBool
 549 MBCSIsValid(NewConverter *cnvData,
 550             const uint8_t *bytes, int32_t length) {
 551     MBCSData *mbcsData=(MBCSData *)cnvData;
 552
 553     return (UBool)(1==ucm_countChars(&mbcsData->ucm->states, bytes, length));
 554 }
 555
 556 static UBool
 557 MBCSSingleAddFromUnicode(MBCSData *mbcsData,
 558                          const uint8_t *bytes, int32_t /*length*/,
 559                          UChar32 c,
 560                          int8_t flag) {
 561     uint16_t *stage3, *p;
 562     uint32_t idx;
 563     uint16_t old;
 564     uint8_t b;
 565
 566     uint32_t blockSize, newTop, i, nextOffset, newBlock, min;
 567
 568     /* ignore |2 SUB mappings */
 569     if(flag==2) {
 570         return TRUE;
 571     }
 572
 573     /*
 574      * Walk down the triple-stage compact array ("trie") and
 575      * allocate parts as necessary.
 576      * Note that the first stage 2 and 3 blocks are reserved for all-unassigned mappings.
 577      * We assume that length<=maxCharLength and that c<=0x10ffff.
 578      */
 579     stage3=(uint16_t *)mbcsData->fromUBytes;
 580     b=*bytes;
 581
 582     /* inspect stage 1 */
 583     idx=c>>MBCS_STAGE_1_SHIFT;
 584     if(mbcsData->utf8Friendly && c<=SBCS_UTF8_MAX) {
 585         nextOffset=(c>>MBCS_STAGE_2_SHIFT)&MBCS_STAGE_2_BLOCK_MASK&~(MBCS_UTF8_STAGE_3_BLOCKS-1);
 586     } else {
 587         nextOffset=(c>>MBCS_STAGE_2_SHIFT)&MBCS_STAGE_2_BLOCK_MASK;
 588     }
 589     if(mbcsData->stage1[idx]==MBCS_STAGE_2_ALL_UNASSIGNED_INDEX) {
 590         /* allocate another block in stage 2 */
 591         newBlock=mbcsData->stage2Top;
 592         if(mbcsData->utf8Friendly) {
 593             min=newBlock-nextOffset; /* minimum block start with overlap */
 594             while(min<newBlock && mbcsData->stage2Single[newBlock-1]==0) {
 595                 --newBlock;
 596             }
 597         }
 598         newTop=newBlock+MBCS_STAGE_2_BLOCK_SIZE;
 599
 600         if(newTop>MBCS_MAX_STAGE_2_TOP) {
 601             fprintf(stderr, "error: too many stage 2 entries at U+%04x<->0x%02x\n", (int)c, b);
 602             return FALSE;
 603         }
 604
 605         /*
 606          * each stage 2 block contains 64 16-bit words:
 607          * 6 code point bits 9..4 with 1 stage 3 index
 608          */
 609         mbcsData->stage1[idx]=(uint16_t)newBlock;
 610         mbcsData->stage2Top=newTop;
 611     }
 612
 613     /* inspect stage 2 */
 614     idx=mbcsData->stage1[idx]+nextOffset;
 615     if(mbcsData->utf8Friendly && c<=SBCS_UTF8_MAX) {
 616         /* allocate 64-entry blocks for UTF-8-friendly lookup */
 617         blockSize=MBCS_UTF8_STAGE_3_BLOCK_SIZE;
 618         nextOffset=c&MBCS_UTF8_STAGE_3_BLOCK_MASK;
 619     } else {
 620         blockSize=MBCS_STAGE_3_BLOCK_SIZE;
 621         nextOffset=c&MBCS_STAGE_3_BLOCK_MASK;
 622     }
 623     if(mbcsData->stage2Single[idx]==0) {
 624         /* allocate another block in stage 3 */
 625         newBlock=mbcsData->stage3Top;
 626         if(mbcsData->utf8Friendly) {
 627             min=newBlock-nextOffset; /* minimum block start with overlap */
 628             while(min<newBlock && stage3[newBlock-1]==0) {
 629                 --newBlock;
 630             }
 631         }
 632         newTop=newBlock+blockSize;
 633
 634         if(newTop>MBCS_STAGE_3_SBCS_SIZE) {
 635             fprintf(stderr, "error: too many code points at U+%04x<->0x%02x\n", (int)c, b);
 636             return FALSE;
 637         }
 638         /* each block has 16 uint16_t entries */
 639         i=idx;
 640         while(newBlock<newTop) {
 641             mbcsData->stage2Single[i++]=(uint16_t)newBlock;
 642             newBlock+=MBCS_STAGE_3_BLOCK_SIZE;
 643         }
 644         mbcsData->stage3Top=newTop; /* ==newBlock */
 645     }
 646
 647     /* write the codepage entry into stage 3 and get the previous entry */
 648     p=stage3+mbcsData->stage2Single[idx]+nextOffset;
 649     old=*p;
 650     if(flag<=0) {
 651         *p=(uint16_t)(0xf00|b);
 652     } else if(IS_PRIVATE_USE(c)) {
 653         *p=(uint16_t)(0xc00|b);
 654     } else {
 655         *p=(uint16_t)(0x800|b);
 656     }
 657
 658     /* check that this Unicode code point was still unassigned */
 659     if(old>=0x100) {
 660         if(flag>=0) {
 661             fprintf(stderr, "error: duplicate Unicode code point at U+%04x<->0x%02x see 0x%02x\n",
 662                 (int)c, b, old&0xff);
 663             return FALSE;
 664         } else if(VERBOSE) {
 665             fprintf(stderr, "duplicate Unicode code point at U+%04x<->0x%02x see 0x%02x\n",
 666                 (int)c, b, old&0xff);
 667         }
 668         /* continue after the above warning if the precision of the mapping is unspecified */
 669     }
 670
 671     return TRUE;
 672 }
 673
 674 static UBool
 675 MBCSAddFromUnicode(MBCSData *mbcsData,
 676                    const uint8_t *bytes, int32_t length,
 677                    UChar32 c,
 678                    int8_t flag) {
 679     char buffer[10];
 680     const uint8_t *pb;
 681     uint8_t *stage3, *p;
 682     uint32_t idx, b, old, stage3Index;
 683     int32_t maxCharLength;
 684
 685     uint32_t blockSize, newTop, i, nextOffset, newBlock, min, overlap, maxOverlap;
 686
 687     maxCharLength=mbcsData->ucm->states.maxCharLength;
 688
 689     if( mbcsData->ucm->states.outputType==MBCS_OUTPUT_2_SISO &&
 690         (!IGNORE_SISO_CHECK && (*bytes==0xe || *bytes==0xf))
 691     ) {
 692         fprintf(stderr, "error: illegal mapping to SI or SO for SI/SO codepage: U+%04x<->0x%s\n",
 693             (int)c, printBytes(buffer, bytes, length));
 694         return FALSE;
 695     }
 696
 697     if(flag==1 && length==1 && *bytes==0) {
 698         fprintf(stderr, "error: unable to encode a |1 fallback from U+%04x to 0x%02x\n",
 699             (int)c, *bytes);
 700         return FALSE;
 701     }
 702
 703     /*
 704      * Walk down the triple-stage compact array ("trie") and
 705      * allocate parts as necessary.
 706      * Note that the first stage 2 and 3 blocks are reserved for
 707      * all-unassigned mappings.
 708      * We assume that length<=maxCharLength and that c<=0x10ffff.
 709      */
 710     stage3=mbcsData->fromUBytes;
 711
 712     /* inspect stage 1 */
 713     idx=c>>MBCS_STAGE_1_SHIFT;
 714     if(mbcsData->utf8Friendly && c<=mbcsData->utf8Max) {
 715         nextOffset=(c>>MBCS_STAGE_2_SHIFT)&MBCS_STAGE_2_BLOCK_MASK&~(MBCS_UTF8_STAGE_3_BLOCKS-1);
 716     } else {
 717         nextOffset=(c>>MBCS_STAGE_2_SHIFT)&MBCS_STAGE_2_BLOCK_MASK;
 718     }
 719     if(mbcsData->stage1[idx]==MBCS_STAGE_2_ALL_UNASSIGNED_INDEX) {
 720         /* allocate another block in stage 2 */
 721         newBlock=mbcsData->stage2Top;
 722         if(mbcsData->utf8Friendly) {
 723             min=newBlock-nextOffset; /* minimum block start with overlap */
 724             while(min<newBlock && mbcsData->stage2[newBlock-1]==0) {
 725                 --newBlock;
 726             }
 727         }
 728         newTop=newBlock+MBCS_STAGE_2_BLOCK_SIZE;
 729
 730         if(newTop>MBCS_MAX_STAGE_2_TOP) {
 731             fprintf(stderr, "error: too many stage 2 entries at U+%04x<->0x%s\n",
 732                 (int)c, printBytes(buffer, bytes, length));
 733             return FALSE;
 734         }
 735
 736         /*
 737          * each stage 2 block contains 64 32-bit words:
 738          * 6 code point bits 9..4 with value with bits 31..16 "assigned" flags and bits 15..0 stage 3 index
 739          */
 740         i=idx;
 741         while(newBlock<newTop) {
 742             mbcsData->stage1[i++]=(uint16_t)newBlock;
 743             newBlock+=MBCS_STAGE_2_BLOCK_SIZE;
 744         }
 745         mbcsData->stage2Top=newTop; /* ==newBlock */
 746     }
 747
 748     /* inspect stage 2 */
 749     idx=mbcsData->stage1[idx]+nextOffset;
 750     if(mbcsData->utf8Friendly && c<=mbcsData->utf8Max) {
 751         /* allocate 64-entry blocks for UTF-8-friendly lookup */
 752         blockSize=MBCS_UTF8_STAGE_3_BLOCK_SIZE*maxCharLength;
 753         nextOffset=c&MBCS_UTF8_STAGE_3_BLOCK_MASK;
 754     } else {
 755         blockSize=MBCS_STAGE_3_BLOCK_SIZE*maxCharLength;
 756         nextOffset=c&MBCS_STAGE_3_BLOCK_MASK;
 757     }
 758     if(mbcsData->stage2[idx]==0) {
 759         /* allocate another block in stage 3 */
 760         newBlock=mbcsData->stage3Top;
 761         if(mbcsData->utf8Friendly && nextOffset>=MBCS_STAGE_3_GRANULARITY) {
 762             /*
 763              * Overlap stage 3 blocks only in multiples of 16-entry blocks
 764              * because of the indexing granularity in stage 2.
 765              */
 766             maxOverlap=(nextOffset&~(MBCS_STAGE_3_GRANULARITY-1))*maxCharLength;
 767             for(overlap=0;
 768                 overlap<maxOverlap && stage3[newBlock-overlap-1]==0;
 769                 ++overlap) {}
 770
 771             overlap=(overlap/MBCS_STAGE_3_GRANULARITY)/maxCharLength;
 772             overlap=(overlap*MBCS_STAGE_3_GRANULARITY)*maxCharLength;
 773
 774             newBlock-=overlap;
 775         }
 776         newTop=newBlock+blockSize;
 777
 778         if(newTop>MBCS_STAGE_3_MBCS_SIZE*(uint32_t)maxCharLength) {
 779             fprintf(stderr, "error: too many code points at U+%04x<->0x%s\n",
 780                 (int)c, printBytes(buffer, bytes, length));
 781             return FALSE;
 782         }
 783         /* each block has 16*maxCharLength bytes */
 784         i=idx;
 785         while(newBlock<newTop) {
 786             mbcsData->stage2[i++]=(newBlock/MBCS_STAGE_3_GRANULARITY)/maxCharLength;
 787             newBlock+=MBCS_STAGE_3_BLOCK_SIZE*maxCharLength;
 788         }
 789         mbcsData->stage3Top=newTop; /* ==newBlock */
 790     }
 791
 792     stage3Index=MBCS_STAGE_3_GRANULARITY*(uint32_t)(uint16_t)mbcsData->stage2[idx];
 793
 794     /* Build an alternate, UTF-8-friendly stage table as well. */
 795     if(mbcsData->utf8Friendly && c<=mbcsData->utf8Max) {
 796         /* Overflow for uint16_t entries in stageUTF8? */
 797         if(stage3Index>0xffff) {
 798             /*
 799              * This can occur only if the mapping table is nearly perfectly filled and if
 800              * utf8Max==0xffff.
 801              * (There is no known charset like this. GB 18030 does not map
 802              * surrogate code points and LMBCS does not map 256 PUA code points.)
 803              *
 804              * Otherwise, stage3Index<=MBCS_UTF8_LIMIT<0xffff
 805              * (stage3Index can at most reach exactly MBCS_UTF8_LIMIT)
 806              * because we have a sorted table and there are at most MBCS_UTF8_LIMIT
 807              * mappings with 0<=c<MBCS_UTF8_LIMIT, and there is only also
 808              * the initial all-unassigned block in stage3.
 809              *
 810              * Solution for the overflow: Reduce utf8Max to the next lower value, 0xfeff.
 811              *
 812              * (See svn revision 20866 of the markus/ucnvutf8 feature branch for
 813              * code that causes MBCSAddTable() to rebuild the table not utf8Friendly
 814              * in case of overflow. That code was not tested.)
 815              */
 816             mbcsData->utf8Max=0xfeff;
 817         } else {
 818             /*
 819              * The stage 3 block has been assigned for the regular trie.
 820              * Just copy its index into stageUTF8[], without the granularity.
 821              */
 822             mbcsData->stageUTF8[c>>MBCS_UTF8_STAGE_SHIFT]=(uint16_t)stage3Index;
 823         }
 824     }
 825
 826     /* write the codepage bytes into stage 3 and get the previous bytes */
 827
 828     /* assemble the bytes into a single integer */
 829     pb=bytes;
 830     b=0;
 831     switch(length) {
 832     case 4:
 833         b=*pb++;
 834     case 3:
 835         b=(b<<8)|*pb++;
 836     case 2:
 837         b=(b<<8)|*pb++;
 838     case 1:
 839     default:
 840         b=(b<<8)|*pb++;
 841         break;
 842     }
 843
 844     old=0;
 845     p=stage3+(stage3Index+nextOffset)*maxCharLength;
 846     switch(maxCharLength) {
 847     case 2:
 848         old=*(uint16_t *)p;
 849         *(uint16_t *)p=(uint16_t)b;
 850         break;
 851     case 3:
 852         old=(uint32_t)*p<<16;
 853         *p++=(uint8_t)(b>>16);
 854         old|=(uint32_t)*p<<8;
 855         *p++=(uint8_t)(b>>8);
 856         old|=*p;
 857         *p=(uint8_t)b;
 858         break;
 859     case 4:
 860         old=*(uint32_t *)p;
 861         *(uint32_t *)p=b;
 862         break;
 863     default:
 864         /* will never occur */
 865         break;
 866     }
 867
 868     /* check that this Unicode code point was still unassigned */
 869     if((mbcsData->stage2[idx+(nextOffset>>MBCS_STAGE_2_SHIFT)]&(1UL<<(16+(c&0xf))))!=0 || old!=0) {
 870         if(flag>=0) {
 871             fprintf(stderr, "error: duplicate Unicode code point at U+%04x<->0x%s see 0x%02x\n",
 872                 (int)c, printBytes(buffer, bytes, length), (int)old);
 873             return FALSE;
 874         } else if(VERBOSE) {
 875             fprintf(stderr, "duplicate Unicode code point at U+%04x<->0x%s see 0x%02x\n",
 876                 (int)c, printBytes(buffer, bytes, length), (int)old);
 877         }
 878         /* continue after the above warning if the precision of the mapping is
 879            unspecified */
 880     }
 881     if(flag<=0) {
 882         /* set the roundtrip flag */
 883         mbcsData->stage2[idx+(nextOffset>>4)]|=(1UL<<(16+(c&0xf)));
 884     }
 885
 886     return TRUE;
 887 }
 888
 889 U_CFUNC UBool
 890 MBCSOkForBaseFromUnicode(const MBCSData *mbcsData,
 891                          const uint8_t *bytes, int32_t length,
 892                          UChar32 c, int8_t flag) {
 893     /*
 894      * A 1:1 mapping does not fit into the MBCS base table's fromUnicode table under
 895      * the following conditions:
 896      *
 897      * - a |2 SUB mapping for <subchar1> (no base table data structure for them)
 898      * - a |1 fallback to 0x00 (result value 0, indistinguishable from unmappable entry)
 899      * - a multi-byte mapping with leading 0x00 bytes (no explicit length field)
 900      *
 901      * Some of these tests are redundant with ucm_mappingType().
 902      */
 903     if( (flag==2 && length==1) ||
 904         (flag==1 && bytes[0]==0) || /* testing length==1 would be redundant with the next test */
 905         (flag<=1 && length>1 && bytes[0]==0)
 906     ) {
 907         return FALSE;
 908     }
 909
 910     /*
 911      * Additional restrictions for UTF-8-friendly fromUnicode tables,
 912      * for code points up to the maximum optimized one:
 913      *
 914      * - any mapping to 0x00 (result value 0, indistinguishable from unmappable entry)
 915      * - any |1 fallback (no roundtrip flags in the optimized table)
 916      */
 917     if(mbcsData->utf8Friendly && flag<=1 && c<=mbcsData->utf8Max && (bytes[0]==0 || flag==1)) {
 918         return FALSE;
 919     }
 920
 921     /*
 922      * If we omit the fromUnicode data, we can only store roundtrips there
 923      * because only they are recoverable from the toUnicode data.
 924      * Fallbacks must go into the extension table.
 925      */
 926     if(mbcsData->omitFromU && flag!=0) {
 927         return FALSE;
 928     }
 929
 930     /* All other mappings do fit into the base table. */
 931     return TRUE;
 932 }
 933
 934 /* we can assume that the table only contains 1:1 mappings with <=4 bytes each */
 935 static UBool
 936 MBCSAddTable(NewConverter *cnvData, UCMTable *table, UConverterStaticData *staticData) {
 937     MBCSData *mbcsData;
 938     UCMapping *m;
 939     UChar32 c;
 940     int32_t i, maxCharLength;
 941     int8_t f;
 942     UBool isOK, utf8Friendly;
 943
 944     staticData->unicodeMask=table->unicodeMask;
 945     if(staticData->unicodeMask==3) {
 946         fprintf(stderr, "error: contains mappings for both supplementary and surrogate code points\n");
 947         return FALSE;
 948     }
 949
 950     staticData->conversionType=UCNV_MBCS;
 951
 952     mbcsData=(MBCSData *)cnvData;
 953     maxCharLength=mbcsData->ucm->states.maxCharLength;
 954
 955     /*
 956      * Generation of UTF-8-friendly data requires
 957      * a sorted table, which makeconv generates when explicit precision
 958      * indicators are used.
 959      */
 960     mbcsData->utf8Friendly=utf8Friendly=(UBool)((table->flagsType&UCM_FLAGS_EXPLICIT)!=0);
 961     if(utf8Friendly) {
 962         mbcsData->utf8Max=MBCS_UTF8_MAX;
 963         if(SMALL && maxCharLength>1) {
 964             mbcsData->omitFromU=TRUE;
 965         }
 966     } else {
 967         mbcsData->utf8Max=0;
 968         if(SMALL && maxCharLength>1) {
 969             fprintf(stderr,
 970                 "makeconv warning: --small not available for .ucm files without |0 etc.\n");
 971         }
 972     }
 973
 974     if(!MBCSStartMappings(mbcsData)) {
 975         return FALSE;
 976     }
 977
 978     staticData->hasFromUnicodeFallback=FALSE;
 979     staticData->hasToUnicodeFallback=FALSE;
 980
 981     isOK=TRUE;
 982
 983     m=table->mappings;
 984     for(i=0; i<table->mappingsLength; ++m, ++i) {
 985         c=m->u;
 986         f=m->f;
 987
 988         /*
 989          * Small optimization for --small .cnv files:
 990          *
 991          * If there are fromUnicode mappings above MBCS_UTF8_MAX,
 992          * then the file size will be smaller if we make utf8Max larger
 993          * because the size increase in stageUTF8 will be more than balanced by
 994          * how much less of stage2 needs to be stored.
 995          *
 996          * There is no point in doing this incrementally because stageUTF8
 997          * uses so much less space per block than stage2,
 998          * so we immediately increase utf8Max to 0xffff.
 999          *
1000          * Do not increase utf8Max if it is already at 0xfeff because MBCSAddFromUnicode()
1001          * sets it to that value when stageUTF8 overflows.
1002          */
1003         if( mbcsData->omitFromU && f<=1 &&
1004             mbcsData->utf8Max<c && c<=0xffff &&
1005             mbcsData->utf8Max<0xfeff
1006         ) {
1007             mbcsData->utf8Max=0xffff;
1008         }
1009
1010         switch(f) {
1011         case -1:
1012             /* there was no precision/fallback indicator */
1013             /* fall through to set the mappings */
1014         case 0:
1015             /* set roundtrip mappings */
1016             isOK&=MBCSAddToUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1017
1018             if(maxCharLength==1) {
1019                 isOK&=MBCSSingleAddFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1020             } else if(MBCSOkForBaseFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f)) {
1021                 isOK&=MBCSAddFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1022             } else {
1023                 m->f|=MBCS_FROM_U_EXT_FLAG;
1024                 m->moveFlag=UCM_MOVE_TO_EXT;
1025             }
1026             break;
1027         case 1:
1028             /* set only a fallback mapping from Unicode to codepage */
1029             if(maxCharLength==1) {
1030                 staticData->hasFromUnicodeFallback=TRUE;
1031                 isOK&=MBCSSingleAddFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1032             } else if(MBCSOkForBaseFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f)) {
1033                 staticData->hasFromUnicodeFallback=TRUE;
1034                 isOK&=MBCSAddFromUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1035             } else {
1036                 m->f|=MBCS_FROM_U_EXT_FLAG;
1037                 m->moveFlag=UCM_MOVE_TO_EXT;
1038             }
1039             break;
1040         case 2:
1041             /* ignore |2 SUB mappings, except to move <subchar1> mappings to the extension table */
1042             if(maxCharLength>1 && m->bLen==1) {
1043                 m->f|=MBCS_FROM_U_EXT_FLAG;
1044                 m->moveFlag=UCM_MOVE_TO_EXT;
1045             }
1046             break;
1047         case 3:
1048             /* set only a fallback mapping from codepage to Unicode */
1049             staticData->hasToUnicodeFallback=TRUE;
1050             isOK&=MBCSAddToUnicode(mbcsData, m->b.bytes, m->bLen, c, f);
1051             break;
1052         case 4:
1053             /* move "good one-way" mappings to the extension table */
1054             m->f|=MBCS_FROM_U_EXT_FLAG;
1055             m->moveFlag=UCM_MOVE_TO_EXT;
1056             break;
1057         default:
1058             /* will not occur because the parser checked it already */
1059             fprintf(stderr, "error: illegal fallback indicator %d\n", f);
1060             return FALSE;
1061         }
1062     }
1063
1064     MBCSPostprocess(mbcsData, staticData);
1065
1066     return isOK;
1067 }
1068
1069 static UBool
1070 transformEUC(MBCSData *mbcsData) {
1071     uint8_t *p8;
1072     uint32_t i, value, oldLength, old3Top;
1073     uint8_t b;
1074
1075     oldLength=mbcsData->ucm->states.maxCharLength;
1076     if(oldLength<3) {
1077         return FALSE;
1078     }
1079
1080     old3Top=mbcsData->stage3Top;
1081
1082     /* careful: 2-byte and 4-byte codes are stored in platform endianness! */
1083
1084     /* test if all first bytes are in {0, 0x8e, 0x8f} */
1085     p8=mbcsData->fromUBytes;
1086
1087 #if !U_IS_BIG_ENDIAN
1088     if(oldLength==4) {
1089         p8+=3;
1090     }
1091 #endif
1092
1093     for(i=0; i<old3Top; i+=oldLength) {
1094         b=p8[i];
1095         if(b!=0 && b!=0x8e && b!=0x8f) {
1096             /* some first byte does not fit the EUC pattern, nothing to be done */
1097             return FALSE;
1098         }
1099     }
1100     /* restore p if it was modified above */
1101     p8=mbcsData->fromUBytes;
1102
1103     /* modify outputType and adjust stage3Top */
1104     mbcsData->ucm->states.outputType=(int8_t)(MBCS_OUTPUT_3_EUC+oldLength-3);
1105     mbcsData->stage3Top=(old3Top*(oldLength-1))/oldLength;
1106
1107     /*
1108      * EUC-encode all byte sequences;
1109      * see "CJKV Information Processing" (1st ed. 1999) from Ken Lunde, O'Reilly,
1110      * p. 161 in chapter 4 "Encoding Methods"
1111      *
1112      * This also must reverse the byte order if the platform is little-endian!
1113      */
1114     if(oldLength==3) {
1115         uint16_t *q=(uint16_t *)p8;
1116         for(i=0; i<old3Top; i+=oldLength) {
1117             b=*p8;
1118             if(b==0) {
1119                 /* short sequences are stored directly */
1120                 /* code set 0 or 1 */
1121                 (*q++)=(uint16_t)((p8[1]<<8)|p8[2]);
1122             } else if(b==0x8e) {
1123                 /* code set 2 */
1124                 (*q++)=(uint16_t)(((p8[1]&0x7f)<<8)|p8[2]);
1125             } else /* b==0x8f */ {
1126                 /* code set 3 */
1127                 (*q++)=(uint16_t)((p8[1]<<8)|(p8[2]&0x7f));
1128             }
1129             p8+=3;
1130         }
1131     } else /* oldLength==4 */ {
1132         uint8_t *q=p8;
1133         uint32_t *p32=(uint32_t *)p8;
1134         for(i=0; i<old3Top; i+=4) {
1135             value=(*p32++);
1136             if(value<=0xffffff) {
1137                 /* short sequences are stored directly */
1138                 /* code set 0 or 1 */
1139                 (*q++)=(uint8_t)(value>>16);
1140                 (*q++)=(uint8_t)(value>>8);
1141                 (*q++)=(uint8_t)value;
1142             } else if(value<=0x8effffff) {
1143                 /* code set 2 */
1144                 (*q++)=(uint8_t)((value>>16)&0x7f);
1145                 (*q++)=(uint8_t)(value>>8);
1146                 (*q++)=(uint8_t)value;
1147             } else /* first byte is 0x8f */ {
1148                 /* code set 3 */
1149                 (*q++)=(uint8_t)(value>>16);
1150                 (*q++)=(uint8_t)((value>>8)&0x7f);
1151                 (*q++)=(uint8_t)value;
1152             }
1153         }
1154     }
1155
1156     return TRUE;
1157 }
1158
1159 /*
1160  * Compact stage 2 for SBCS by overlapping adjacent stage 2 blocks as far
1161  * as possible. Overlapping is done on unassigned head and tail
1162  * parts of blocks in steps of MBCS_STAGE_2_MULTIPLIER.
1163  * Stage 1 indexes need to be adjusted accordingly.
1164  * This function is very similar to genprops/store.c/compactStage().
1165  */
1166 static void
1167 singleCompactStage2(MBCSData *mbcsData) {
1168     /* this array maps the ordinal number of a stage 2 block to its new stage 1 index */
1169     uint16_t map[MBCS_STAGE_2_MAX_BLOCKS];
1170     uint16_t i, start, prevEnd, newStart;
1171
1172     /* enter the all-unassigned first stage 2 block into the map */
1173     map[0]=MBCS_STAGE_2_ALL_UNASSIGNED_INDEX;
1174
1175     /* begin with the first block after the all-unassigned one */
1176     start=newStart=MBCS_STAGE_2_FIRST_ASSIGNED;
1177     while(start<mbcsData->stage2Top) {
1178         prevEnd=(uint16_t)(newStart-1);
1179
1180         /* find the size of the overlap */
1181         for(i=0; i<MBCS_STAGE_2_BLOCK_SIZE && mbcsData->stage2Single[start+i]==0 && mbcsData->stage2Single[prevEnd-i]==0; ++i) {}
1182
1183         if(i>0) {
1184             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=(uint16_t)(newStart-i);
1185
1186             /* move the non-overlapping indexes to their new positions */
1187             start+=i;
1188             for(i=(uint16_t)(MBCS_STAGE_2_BLOCK_SIZE-i); i>0; --i) {
1189                 mbcsData->stage2Single[newStart++]=mbcsData->stage2Single[start++];
1190             }
1191         } else if(newStart<start) {
1192             /* move the indexes to their new positions */
1193             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=newStart;
1194             for(i=MBCS_STAGE_2_BLOCK_SIZE; i>0; --i) {
1195                 mbcsData->stage2Single[newStart++]=mbcsData->stage2Single[start++];
1196             }
1197         } else /* no overlap && newStart==start */ {
1198             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=start;
1199             start=newStart+=MBCS_STAGE_2_BLOCK_SIZE;
1200         }
1201     }
1202
1203     /* adjust stage2Top */
1204     if(VERBOSE && newStart<mbcsData->stage2Top) {
1205         printf("compacting stage 2 from stage2Top=0x%lx to 0x%lx, saving %ld bytes\n",
1206                 (unsigned long)mbcsData->stage2Top, (unsigned long)newStart,
1207                 (long)(mbcsData->stage2Top-newStart)*2);
1208     }
1209     mbcsData->stage2Top=newStart;
1210
1211     /* now adjust stage 1 */
1212     for(i=0; i<MBCS_STAGE_1_SIZE; ++i) {
1213         mbcsData->stage1[i]=map[mbcsData->stage1[i]>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT];
1214     }
1215 }
1216
1217 /* Compact stage 3 for SBCS - same algorithm as above. */
1218 static void
1219 singleCompactStage3(MBCSData *mbcsData) {
1220     uint16_t *stage3=(uint16_t *)mbcsData->fromUBytes;
1221
1222     /* this array maps the ordinal number of a stage 3 block to its new stage 2 index */
1223     uint16_t map[0x1000];
1224     uint16_t i, start, prevEnd, newStart;
1225
1226     /* enter the all-unassigned first stage 3 block into the map */
1227     map[0]=0;
1228
1229     /* begin with the first block after the all-unassigned one */
1230     start=newStart=16;
1231     while(start<mbcsData->stage3Top) {
1232         prevEnd=(uint16_t)(newStart-1);
1233
1234         /* find the size of the overlap */
1235         for(i=0; i<16 && stage3[start+i]==0 && stage3[prevEnd-i]==0; ++i) {}
1236
1237         if(i>0) {
1238             map[start>>4]=(uint16_t)(newStart-i);
1239
1240             /* move the non-overlapping indexes to their new positions */
1241             start+=i;
1242             for(i=(uint16_t)(16-i); i>0; --i) {
1243                 stage3[newStart++]=stage3[start++];
1244             }
1245         } else if(newStart<start) {
1246             /* move the indexes to their new positions */
1247             map[start>>4]=newStart;
1248             for(i=16; i>0; --i) {
1249                 stage3[newStart++]=stage3[start++];
1250             }
1251         } else /* no overlap && newStart==start */ {
1252             map[start>>4]=start;
1253             start=newStart+=16;
1254         }
1255     }
1256
1257     /* adjust stage3Top */
1258     if(VERBOSE && newStart<mbcsData->stage3Top) {
1259         printf("compacting stage 3 from stage3Top=0x%lx to 0x%lx, saving %ld bytes\n",
1260                 (unsigned long)mbcsData->stage3Top, (unsigned long)newStart,
1261                 (long)(mbcsData->stage3Top-newStart)*2);
1262     }
1263     mbcsData->stage3Top=newStart;
1264
1265     /* now adjust stage 2 */
1266     for(i=0; i<mbcsData->stage2Top; ++i) {
1267         mbcsData->stage2Single[i]=map[mbcsData->stage2Single[i]>>4];
1268     }
1269 }
1270
1271 /*
1272  * Compact stage 2 by overlapping adjacent stage 2 blocks as far
1273  * as possible. Overlapping is done on unassigned head and tail
1274  * parts of blocks in steps of MBCS_STAGE_2_MULTIPLIER.
1275  * Stage 1 indexes need to be adjusted accordingly.
1276  * This function is very similar to genprops/store.c/compactStage().
1277  */
1278 static void
1279 compactStage2(MBCSData *mbcsData) {
1280     /* this array maps the ordinal number of a stage 2 block to its new stage 1 index */
1281     uint16_t map[MBCS_STAGE_2_MAX_BLOCKS];
1282     uint16_t i, start, prevEnd, newStart;
1283
1284     /* enter the all-unassigned first stage 2 block into the map */
1285     map[0]=MBCS_STAGE_2_ALL_UNASSIGNED_INDEX;
1286
1287     /* begin with the first block after the all-unassigned one */
1288     start=newStart=MBCS_STAGE_2_FIRST_ASSIGNED;
1289     while(start<mbcsData->stage2Top) {
1290         prevEnd=(uint16_t)(newStart-1);
1291
1292         /* find the size of the overlap */
1293         for(i=0; i<MBCS_STAGE_2_BLOCK_SIZE && mbcsData->stage2[start+i]==0 && mbcsData->stage2[prevEnd-i]==0; ++i) {}
1294
1295         if(i>0) {
1296             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=(uint16_t)(newStart-i);
1297
1298             /* move the non-overlapping indexes to their new positions */
1299             start+=i;
1300             for(i=(uint16_t)(MBCS_STAGE_2_BLOCK_SIZE-i); i>0; --i) {
1301                 mbcsData->stage2[newStart++]=mbcsData->stage2[start++];
1302             }
1303         } else if(newStart<start) {
1304             /* move the indexes to their new positions */
1305             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=newStart;
1306             for(i=MBCS_STAGE_2_BLOCK_SIZE; i>0; --i) {
1307                 mbcsData->stage2[newStart++]=mbcsData->stage2[start++];
1308             }
1309         } else /* no overlap && newStart==start */ {
1310             map[start>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT]=start;
1311             start=newStart+=MBCS_STAGE_2_BLOCK_SIZE;
1312         }
1313     }
1314
1315     /* adjust stage2Top */
1316     if(VERBOSE && newStart<mbcsData->stage2Top) {
1317         printf("compacting stage 2 from stage2Top=0x%lx to 0x%lx, saving %ld bytes\n",
1318                 (unsigned long)mbcsData->stage2Top, (unsigned long)newStart,
1319                 (long)(mbcsData->stage2Top-newStart)*4);
1320     }
1321     mbcsData->stage2Top=newStart;
1322
1323     /* now adjust stage 1 */
1324     for(i=0; i<MBCS_STAGE_1_SIZE; ++i) {
1325         mbcsData->stage1[i]=map[mbcsData->stage1[i]>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT];
1326     }
1327 }
1328
1329 static void
1330 MBCSPostprocess(MBCSData *mbcsData, const UConverterStaticData * /*staticData*/) {
1331     UCMStates *states;
1332     int32_t maxCharLength, stage3Width;
1333
1334     states=&mbcsData->ucm->states;
1335     stage3Width=maxCharLength=states->maxCharLength;
1336
1337     ucm_optimizeStates(states,
1338                        &mbcsData->unicodeCodeUnits,
1339                        mbcsData->toUFallbacks, mbcsData->countToUFallbacks,
1340                        VERBOSE);
1341
1342     /* try to compact the fromUnicode tables */
1343     if(transformEUC(mbcsData)) {
1344         --stage3Width;
1345     }
1346
1347     /*
1348      * UTF-8-friendly tries are built precompacted, to cope with variable
1349      * stage 3 allocation block sizes.
1350      *
1351      * Tables without precision indicators cannot be built that way,
1352      * because if a block was overlapped with a previous one, then a smaller
1353      * code point for the same block would not fit.
1354      * Therefore, such tables are not marked UTF-8-friendly and must be
1355      * compacted after all mappings are entered.
1356      */
1357     if(!mbcsData->utf8Friendly) {
1358         if(maxCharLength==1) {
1359             singleCompactStage3(mbcsData);
1360             singleCompactStage2(mbcsData);
1361         } else {
1362             compactStage2(mbcsData);
1363         }
1364     }
1365
1366     if(VERBOSE) {
1367         /*uint32_t c, i1, i2, i2Limit, i3;*/
1368
1369         printf("fromUnicode number of uint%s_t in stage 2: 0x%lx=%lu\n",
1370                maxCharLength==1 ? "16" : "32",
1371                (unsigned long)mbcsData->stage2Top,
1372                (unsigned long)mbcsData->stage2Top);
1373         printf("fromUnicode number of %d-byte stage 3 mapping entries: 0x%lx=%lu\n",
1374                (int)stage3Width,
1375                (unsigned long)mbcsData->stage3Top/stage3Width,
1376                (unsigned long)mbcsData->stage3Top/stage3Width);
1377 #if 0
1378         c=0;
1379         for(i1=0; i1<MBCS_STAGE_1_SIZE; ++i1) {
1380             i2=mbcsData->stage1[i1];
1381             if(i2==0) {
1382                 c+=MBCS_STAGE_2_BLOCK_SIZE*MBCS_STAGE_3_BLOCK_SIZE;
1383                 continue;
1384             }
1385             for(i2Limit=i2+MBCS_STAGE_2_BLOCK_SIZE; i2<i2Limit; ++i2) {
1386                 if(maxCharLength==1) {
1387                     i3=mbcsData->stage2Single[i2];
1388                 } else {
1389                     i3=(uint16_t)mbcsData->stage2[i2];
1390                 }
1391                 if(i3==0) {
1392                     c+=MBCS_STAGE_3_BLOCK_SIZE;
1393                     continue;
1394                 }
1395                 printf("U+%04lx i1=0x%02lx i2=0x%04lx i3=0x%04lx\n",
1396                        (unsigned long)c,
1397                        (unsigned long)i1,
1398                        (unsigned long)i2,
1399                        (unsigned long)i3);
1400                 c+=MBCS_STAGE_3_BLOCK_SIZE;
1401             }
1402         }
1403 #endif
1404     }
1405 }
1406
1407 static uint32_t
1408 MBCSWrite(NewConverter *cnvData, const UConverterStaticData *staticData,
1409           UNewDataMemory *pData, int32_t tableType) {
1410     MBCSData *mbcsData=(MBCSData *)cnvData;
1411     uint32_t stage2Start, stage2Length;
1412     uint32_t top, stageUTF8Length=0;
1413     int32_t i, stage1Top;
1414     uint32_t headerLength;
1415
1416     _MBCSHeader header=UCNV_MBCS_HEADER_INITIALIZER;
1417
1418     stage2Length=mbcsData->stage2Top;
1419     if(mbcsData->omitFromU) {
1420         /* find how much of stage2 can be omitted */
1421         int32_t utf8Limit=(int32_t)mbcsData->utf8Max+1;
1422         uint32_t st2=0; /*initialized it to avoid compiler warnings */
1423
1424         i=utf8Limit>>MBCS_STAGE_1_SHIFT;
1425         if((utf8Limit&((1<<MBCS_STAGE_1_SHIFT)-1))!=0 && (st2=mbcsData->stage1[i])!=0) {
1426             /* utf8Limit is in the middle of an existing stage 2 block */
1427             stage2Start=st2+((utf8Limit>>MBCS_STAGE_2_SHIFT)&MBCS_STAGE_2_BLOCK_MASK);
1428         } else {
1429             /* find the last stage2 block with mappings before utf8Limit */
1430             while(i>0 && (st2=mbcsData->stage1[--i])==0) {}
1431             /* stage2 up to the end of this block corresponds to stageUTF8 */
1432             stage2Start=st2+MBCS_STAGE_2_BLOCK_SIZE;
1433         }
1434         header.options|=MBCS_OPT_NO_FROM_U;
1435         header.fullStage2Length=stage2Length;
1436         stage2Length-=stage2Start;
1437         if(VERBOSE) {
1438             printf("+ omitting %lu out of %lu stage2 entries and %lu fromUBytes\n",
1439                     (unsigned long)stage2Start,
1440                     (unsigned long)mbcsData->stage2Top,
1441                     (unsigned long)mbcsData->stage3Top);
1442             printf("+ total size savings: %lu bytes\n", (unsigned long)stage2Start*4+mbcsData->stage3Top);
1443         }
1444     } else {
1445         stage2Start=0;
1446     }
1447
1448     if(staticData->unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
1449         stage1Top=MBCS_STAGE_1_SIZE; /* 0x440==1088 */
1450     } else {
1451         stage1Top=0x40; /* 0x40==64 */
1452     }
1453
1454     /* adjust stage 1 entries to include the size of stage 1 in the offsets to stage 2 */
1455     if(mbcsData->ucm->states.maxCharLength==1) {
1456         for(i=0; i<stage1Top; ++i) {
1457             mbcsData->stage1[i]+=(uint16_t)stage1Top;
1458         }
1459
1460         /* stage2Top/Length have counted 16-bit results, now we need to count bytes */
1461         /* also round up to a multiple of 4 bytes */
1462         stage2Length=(stage2Length*2+1)&~1;
1463
1464         /* stage3Top has counted 16-bit results, now we need to count bytes */
1465         mbcsData->stage3Top*=2;
1466
1467         if(mbcsData->utf8Friendly) {
1468             header.version[2]=(uint8_t)(SBCS_UTF8_MAX>>8); /* store 0x1f for max==0x1fff */
1469         }
1470     } else {
1471         for(i=0; i<stage1Top; ++i) {
1472             mbcsData->stage1[i]+=(uint16_t)stage1Top/2; /* stage 2 contains 32-bit entries, stage 1 16-bit entries */
1473         }
1474
1475         /* stage2Top/Length have counted 32-bit results, now we need to count bytes */
1476         stage2Length*=4;
1477         /* leave stage2Start counting 32-bit units */
1478
1479         if(mbcsData->utf8Friendly) {
1480             stageUTF8Length=(mbcsData->utf8Max+1)>>MBCS_UTF8_STAGE_SHIFT;
1481             header.version[2]=(uint8_t)(mbcsData->utf8Max>>8); /* store 0xd7 for max==0xd7ff */
1482         }
1483
1484         /* stage3Top has already counted bytes */
1485     }
1486
1487     /* round up stage3Top so that the sizes of all data blocks are multiples of 4 */
1488     mbcsData->stage3Top=(mbcsData->stage3Top+3)&~3;
1489
1490     /* fill the header */
1491     if(header.options&MBCS_OPT_INCOMPATIBLE_MASK) {
1492         header.version[0]=5;
1493         if(header.options&MBCS_OPT_NO_FROM_U) {
1494             headerLength=10;  /* include fullStage2Length */
1495         } else {
1496             headerLength=MBCS_HEADER_V5_MIN_LENGTH;  /* 9 */
1497         }
1498     } else {
1499         header.version[0]=4;
1500         headerLength=MBCS_HEADER_V4_LENGTH;  /* 8 */
1501     }
1502     header.version[1]=4;
1503     /* header.version[2] set above for utf8Friendly data */
1504
1505     header.options|=(uint32_t)headerLength;
1506
1507     header.countStates=mbcsData->ucm->states.countStates;
1508     header.countToUFallbacks=mbcsData->countToUFallbacks;
1509
1510     header.offsetToUCodeUnits=
1511         headerLength*4+
1512         mbcsData->ucm->states.countStates*1024+
1513         mbcsData->countToUFallbacks*sizeof(_MBCSToUFallback);
1514     header.offsetFromUTable=
1515         header.offsetToUCodeUnits+
1516         mbcsData->ucm->states.countToUCodeUnits*2;
1517     header.offsetFromUBytes=
1518         header.offsetFromUTable+
1519         stage1Top*2+
1520         stage2Length;
1521     header.fromUBytesLength=mbcsData->stage3Top;
1522
1523     top=header.offsetFromUBytes+stageUTF8Length*2;
1524     if(!(header.options&MBCS_OPT_NO_FROM_U)) {
1525         top+=header.fromUBytesLength;
1526     }
1527
1528     header.flags=(uint8_t)(mbcsData->ucm->states.outputType);
1529
1530     if(tableType&TABLE_EXT) {
1531         if(top>0xffffff) {
1532             fprintf(stderr, "error: offset 0x%lx to extension table exceeds 0xffffff\n", (long)top);
1533             return 0;
1534         }
1535
1536         header.flags|=top<<8;
1537     }
1538
1539     /* write the MBCS data */
1540     udata_writeBlock(pData, &header, headerLength*4);
1541     udata_writeBlock(pData, mbcsData->ucm->states.stateTable, header.countStates*1024);
1542     udata_writeBlock(pData, mbcsData->toUFallbacks, mbcsData->countToUFallbacks*sizeof(_MBCSToUFallback));
1543     udata_writeBlock(pData, mbcsData->unicodeCodeUnits, mbcsData->ucm->states.countToUCodeUnits*2);
1544     udata_writeBlock(pData, mbcsData->stage1, stage1Top*2);
1545     if(mbcsData->ucm->states.maxCharLength==1) {
1546         udata_writeBlock(pData, mbcsData->stage2Single+stage2Start, stage2Length);
1547     } else {
1548         udata_writeBlock(pData, mbcsData->stage2+stage2Start, stage2Length);
1549     }
1550     if(!(header.options&MBCS_OPT_NO_FROM_U)) {
1551         udata_writeBlock(pData, mbcsData->fromUBytes, mbcsData->stage3Top);
1552     }
1553
1554     if(stageUTF8Length>0) {
1555         udata_writeBlock(pData, mbcsData->stageUTF8, stageUTF8Length*2);
1556     }
1557
1558     /* return the number of bytes that should have been written */
1559     return top;
1560 }