icuSources/tools/icuswap/icuswap.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 2003-2006, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  icuswap.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2003aug08
  14 *   created by: Markus W. Scherer
  15 *
  16 *   This tool takes an ICU data file and "swaps" it, that is, changes its
  17 *   platform properties between big-/little-endianness and ASCII/EBCDIC charset
  18 *   families.
  19 *   The modified data file is written to a new file.
  20 *   Useful as an install-time tool for shipping only one flavor of ICU data
  21 *   and preparing data files for the target platform.
  22 *   Will not work with data DLLs (shared libraries).
  23 */
  24
  25 #include "unicode/utypes.h"
  26 #include "unicode/putil.h"
  27 #include "unicode/udata.h"
  28 #include "cmemory.h"
  29 #include "cstring.h"
  30 #include "uinvchar.h"
  31 #include "uarrsort.h"
  32 #include "ucmndata.h"
  33 #include "udataswp.h"
  34 #include "swapimpl.h"
  35 #include "toolutil.h"
  36 #include "uoptions.h"
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 /* definitions */
  43
  44 #define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
  45
  46 static UOption options[]={
  47     UOPTION_HELP_H,
  48     UOPTION_HELP_QUESTION_MARK,
  49     UOPTION_DEF("type", 't', UOPT_REQUIRES_ARG)
  50 };
  51
  52 enum {
  53     OPT_HELP_H,
  54     OPT_HELP_QUESTION_MARK,
  55     OPT_OUT_TYPE
  56 };
  57
  58 static int32_t
  59 fileSize(FILE *f) {
  60     int32_t size;
  61
  62     fseek(f, 0, SEEK_END);
  63     size=(int32_t)ftell(f);
  64     fseek(f, 0, SEEK_SET);
  65     return size;
  66 }
  67
  68 /**
  69  * Swap an ICU .dat package, including swapping of enclosed items.
  70  */
  71 U_CFUNC int32_t U_CALLCONV
  72 udata_swapPackage(const char *inFilename, const char *outFilename,
  73                   const UDataSwapper *ds,
  74                   const void *inData, int32_t length, void *outData,
  75                   UErrorCode *pErrorCode);
  76
  77 U_CDECL_BEGIN
  78 static void U_CALLCONV
  79 printError(void *context, const char *fmt, va_list args) {
  80     vfprintf((FILE *)context, fmt, args);
  81 }
  82 U_CDECL_END
  83
  84 static int
  85 printUsage(const char *pname, UBool ishelp) {
  86     fprintf(stderr,
  87             "%csage: %s [ -h, -?, --help ] -tl|-tb|-te|--type=b|... infilename outfilename\n",
  88             ishelp ? 'U' : 'u', pname);
  89     if(ishelp) {
  90         fprintf(stderr,
  91               "\nOptions: -h, -?, --help    print this message and exit\n"
  92                 "         Read the input file, swap its platform properties according\n"
  93                 "         to the -t or --type option, and write the result to the output file.\n"
  94                 "         -tl               change to little-endian/ASCII charset family\n"
  95                 "         -tb               change to big-endian/ASCII charset family\n"
  96                 "         -te               change to big-endian/EBCDIC charset family\n");
  97     }
  98
  99     return !ishelp;
 100 }
 101
 102 extern int
 103 main(int argc, char *argv[]) {
 104     FILE *in, *out;
 105     const char *pname;
 106     char *data;
 107     int32_t length;
 108     UBool ishelp;
 109     int rc;
 110
 111     UDataSwapper *ds;
 112     const UDataInfo *pInfo;
 113     UErrorCode errorCode;
 114     uint8_t outCharset;
 115     UBool outIsBigEndian;
 116
 117     U_MAIN_INIT_ARGS(argc, argv);
 118
 119     fprintf(stderr, "Warning: icuswap is an obsolete tool and it will be removed in the next ICU release.\nPlease use the icupkg tool instead.\n");
 120
 121     /* get the program basename */
 122     pname=strrchr(argv[0], U_FILE_SEP_CHAR);
 123     if(pname==NULL) {
 124         pname=strrchr(argv[0], '/');
 125     }
 126     if(pname!=NULL) {
 127         ++pname;
 128     } else {
 129         pname=argv[0];
 130     }
 131
 132     argc=u_parseArgs(argc, argv, LENGTHOF(options), options);
 133     ishelp=options[OPT_HELP_H].doesOccur || options[OPT_HELP_QUESTION_MARK].doesOccur;
 134     if(ishelp || argc!=3) {
 135         return printUsage(pname, ishelp);
 136     }
 137
 138     /* parse the output type option */
 139     data=(char *)options[OPT_OUT_TYPE].value;
 140     if(data[0]==0 || data[1]!=0) {
 141         /* the type must be exactly one letter */
 142         return printUsage(pname, FALSE);
 143     }
 144     switch(data[0]) {
 145     case 'l':
 146         outIsBigEndian=FALSE;
 147         outCharset=U_ASCII_FAMILY;
 148         break;
 149     case 'b':
 150         outIsBigEndian=TRUE;
 151         outCharset=U_ASCII_FAMILY;
 152         break;
 153     case 'e':
 154         outIsBigEndian=TRUE;
 155         outCharset=U_EBCDIC_FAMILY;
 156         break;
 157     default:
 158         return printUsage(pname, FALSE);
 159     }
 160
 161     in=out=NULL;
 162     data=NULL;
 163
 164     /* open the input file, get its length, allocate memory for it, read the file */
 165     in=fopen(argv[1], "rb");
 166     if(in==NULL) {
 167         fprintf(stderr, "%s: unable to open input file \"%s\"\n", pname, argv[1]);
 168         rc=2;
 169         goto done;
 170     }
 171
 172     length=fileSize(in);
 173     if(length<=0) {
 174         fprintf(stderr, "%s: empty input file \"%s\"\n", pname, argv[1]);
 175         rc=2;
 176         goto done;
 177     }
 178
 179     /*
 180      * +15: udata_swapPackage() may need to add a few padding bytes to the
 181      * last item if charset swapping is done,
 182      * because the last item may be resorted into the middle and then needs
 183      * additional padding bytes
 184      */
 185     data=(char *)malloc(length+15);
 186     if(data==NULL) {
 187         fprintf(stderr, "%s: error allocating memory for \"%s\"\n", pname, argv[1]);
 188         rc=2;
 189         goto done;
 190     }
 191
 192     /* set the last 15 bytes to the usual padding byte, see udata_swapPackage() */
 193     uprv_memset(data+length-15, 0xaa, 15);
 194
 195     if(length!=(int32_t)fread(data, 1, length, in)) {
 196         fprintf(stderr, "%s: error reading \"%s\"\n", pname, argv[1]);
 197         rc=3;
 198         goto done;
 199     }
 200
 201     fclose(in);
 202     in=NULL;
 203
 204     /* swap the data in-place */
 205     errorCode=U_ZERO_ERROR;
 206     ds=udata_openSwapperForInputData(data, length, outIsBigEndian, outCharset, &errorCode);
 207     if(U_FAILURE(errorCode)) {
 208         fprintf(stderr, "%s: udata_openSwapperForInputData(\"%s\") failed - %s\n",
 209                 pname, argv[1], u_errorName(errorCode));
 210         rc=4;
 211         goto done;
 212     }
 213
 214     ds->printError=printError;
 215     ds->printErrorContext=stderr;
 216
 217     /* speculative cast, protected by the following length check */
 218     pInfo=(const UDataInfo *)((const char *)data+4);
 219
 220     if( length>=20 &&
 221         pInfo->dataFormat[0]==0x43 &&   /* dataFormat="CmnD" */
 222         pInfo->dataFormat[1]==0x6d &&
 223         pInfo->dataFormat[2]==0x6e &&
 224         pInfo->dataFormat[3]==0x44
 225     ) {
 226         /*
 227          * swap the .dat package
 228          * udata_swapPackage() needs to rename ToC name entries from the old package
 229          * name to the new one.
 230          * We pass it the filenames, and udata_swapPackage() will extract the
 231          * package names.
 232          */
 233         length=udata_swapPackage(argv[1], argv[2], ds, data, length, data, &errorCode);
 234         udata_closeSwapper(ds);
 235         if(U_FAILURE(errorCode)) {
 236             fprintf(stderr, "%s: udata_swapPackage(\"%s\") failed - %s\n",
 237                     pname, argv[1], u_errorName(errorCode));
 238             rc=4;
 239             goto done;
 240         }
 241     } else {
 242         /* swap the data, which is not a .dat package */
 243         length=udata_swap(ds, data, length, data, &errorCode);
 244         udata_closeSwapper(ds);
 245         if(U_FAILURE(errorCode)) {
 246             fprintf(stderr, "%s: udata_swap(\"%s\") failed - %s\n",
 247                     pname, argv[1], u_errorName(errorCode));
 248             rc=4;
 249             goto done;
 250         }
 251     }
 252
 253     out=fopen(argv[2], "wb");
 254     if(out==NULL) {
 255         fprintf(stderr, "%s: unable to open output file \"%s\"\n", pname, argv[2]);
 256         rc=5;
 257         goto done;
 258     }
 259
 260     if(length!=(int32_t)fwrite(data, 1, length, out)) {
 261         fprintf(stderr, "%s: error writing \"%s\"\n", pname, argv[2]);
 262         rc=6;
 263         goto done;
 264     }
 265
 266     fclose(out);
 267     out=NULL;
 268
 269     /* all done */
 270     rc=0;
 271
 272 done:
 273     if(in!=NULL) {
 274         fclose(in);
 275     }
 276     if(out!=NULL) {
 277         fclose(out);
 278     }
 279     if(data!=NULL) {
 280         free(data);
 281     }
 282     return rc;
 283 }
 284
 285 /* swap .dat package files -------------------------------------------------- */
 286
 287 static int32_t
 288 extractPackageName(const UDataSwapper *ds, const char *filename,
 289                    char pkg[], int32_t capacity,
 290                    UErrorCode *pErrorCode) {
 291     const char *basename;
 292     int32_t len;
 293
 294     if(U_FAILURE(*pErrorCode)) {
 295         return 0;
 296     }
 297
 298     basename=findBasename(filename);
 299     len=(int32_t)uprv_strlen(basename)-4; /* -4: subtract the length of ".dat" */
 300
 301     if(len<=0 || 0!=uprv_strcmp(basename+len, ".dat")) {
 302         udata_printError(ds, "udata_swapPackage(): \"%s\" is not recognized as a package filename (must end with .dat)\n",
 303                          basename);
 304         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
 305         return 0;
 306     }
 307
 308     if(len>=capacity) {
 309         udata_printError(ds, "udata_swapPackage(): the package name \"%s\" is too long (>=%ld)\n",
 310                          (long)capacity);
 311         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
 312         return 0;
 313     }
 314
 315     uprv_memcpy(pkg, basename, len);
 316     pkg[len]=0;
 317     return len;
 318 }
 319
 320 struct ToCEntry {
 321     uint32_t nameOffset, inOffset, outOffset, length;
 322 };
 323
 324 U_CDECL_BEGIN
 325 static int32_t U_CALLCONV
 326 compareToCEntries(const void *context, const void *left, const void *right) {
 327     const char *chars=(const char *)context;
 328     return (int32_t)uprv_strcmp(chars+((const ToCEntry *)left)->nameOffset,
 329                                 chars+((const ToCEntry *)right)->nameOffset);
 330 }
 331 U_CDECL_END
 332
 333 U_CFUNC int32_t U_CALLCONV
 334 udata_swapPackage(const char *inFilename, const char *outFilename,
 335                   const UDataSwapper *ds,
 336                   const void *inData, int32_t length, void *outData,
 337                   UErrorCode *pErrorCode) {
 338     const UDataInfo *pInfo;
 339     int32_t headerSize;
 340
 341     const uint8_t *inBytes;
 342     uint8_t *outBytes;
 343
 344     uint32_t itemCount, offset, i;
 345     int32_t itemLength;
 346
 347     const UDataOffsetTOCEntry *inEntries;
 348     UDataOffsetTOCEntry *outEntries;
 349
 350     ToCEntry *table;
 351
 352     char inPkgName[32], outPkgName[32];
 353     int32_t inPkgNameLength, outPkgNameLength;
 354
 355     /* udata_swapDataHeader checks the arguments */
 356     headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
 357     if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
 358         return 0;
 359     }
 360
 361     /* check data format and format version */
 362     pInfo=(const UDataInfo *)((const char *)inData+4);
 363     if(!(
 364         pInfo->dataFormat[0]==0x43 &&   /* dataFormat="CmnD" */
 365         pInfo->dataFormat[1]==0x6d &&
 366         pInfo->dataFormat[2]==0x6e &&
 367         pInfo->dataFormat[3]==0x44 &&
 368         pInfo->formatVersion[0]==1
 369     )) {
 370         udata_printError(ds, "udata_swapPackage(): data format %02x.%02x.%02x.%02x (format version %02x) is not recognized as an ICU .dat package\n",
 371                          pInfo->dataFormat[0], pInfo->dataFormat[1],
 372                          pInfo->dataFormat[2], pInfo->dataFormat[3],
 373                          pInfo->formatVersion[0]);
 374         *pErrorCode=U_UNSUPPORTED_ERROR;
 375         return 0;
 376     }
 377
 378     /*
 379      * We need to change the ToC name entries so that they have the correct
 380      * package name prefix.
 381      * Extract the package names from the in/out filenames.
 382      */
 383     inPkgNameLength=extractPackageName(
 384                         ds, inFilename,
 385                         inPkgName, (int32_t)sizeof(inPkgName),
 386                         pErrorCode);
 387     outPkgNameLength=extractPackageName(
 388                         ds, outFilename,
 389                         outPkgName, (int32_t)sizeof(outPkgName),
 390                         pErrorCode);
 391     if(U_FAILURE(*pErrorCode)) {
 392         return 0;
 393     }
 394
 395     /*
 396      * It is possible to work with inPkgNameLength!=outPkgNameLength,
 397      * but then the length of the data file would change more significantly,
 398      * which we are not currently prepared for.
 399      */
 400     if(inPkgNameLength!=outPkgNameLength) {
 401         udata_printError(ds, "udata_swapPackage(): the package names \"%s\" and \"%s\" must have the same length\n",
 402                          inPkgName, outPkgName);
 403         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
 404         return 0;
 405     }
 406
 407     inBytes=(const uint8_t *)inData+headerSize;
 408     inEntries=(const UDataOffsetTOCEntry *)(inBytes+4);
 409
 410     if(length<0) {
 411         /* preflighting */
 412         itemCount=ds->readUInt32(*(const uint32_t *)inBytes);
 413         if(itemCount==0) {
 414             /* no items: count only the item count and return */
 415             return headerSize+4;
 416         }
 417
 418         /* read the last item's offset and preflight it */
 419         offset=ds->readUInt32(inEntries[itemCount-1].dataOffset);
 420         itemLength=udata_swap(ds, inBytes+offset, -1, NULL, pErrorCode);
 421
 422         if(U_SUCCESS(*pErrorCode)) {
 423             return headerSize+offset+(uint32_t)itemLength;
 424         } else {
 425             return 0;
 426         }
 427     } else {
 428         /* check that the itemCount fits, then the ToC table, then at least the header of the last item */
 429         length-=headerSize;
 430         if(length<4) {
 431             /* itemCount does not fit */
 432             offset=0xffffffff;
 433             itemCount=0; /* make compilers happy */
 434         } else {
 435             itemCount=ds->readUInt32(*(const uint32_t *)inBytes);
 436             if(itemCount==0) {
 437                 offset=4;
 438             } else if((uint32_t)length<(4+8*itemCount)) {
 439                 /* ToC table does not fit */
 440                 offset=0xffffffff;
 441             } else {
 442                 /* offset of the last item plus at least 20 bytes for its header */
 443                 offset=20+ds->readUInt32(inEntries[itemCount-1].dataOffset);
 444             }
 445         }
 446         if((uint32_t)length<offset) {
 447             udata_printError(ds, "udata_swapPackage(): too few bytes (%d after header) for a .dat package\n",
 448                              length);
 449             *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
 450             return 0;
 451         }
 452
 453         outBytes=(uint8_t *)outData+headerSize;
 454
 455         /* swap the item count */
 456         ds->swapArray32(ds, inBytes, 4, outBytes, pErrorCode);
 457
 458         if(itemCount==0) {
 459             /* no items: just return now */
 460             return headerSize+4;
 461         }
 462
 463         /* swap the item name strings */
 464         offset=4+8*itemCount;
 465         itemLength=(int32_t)(ds->readUInt32(inEntries[0].dataOffset)-offset);
 466         udata_swapInvStringBlock(ds, inBytes+offset, itemLength, outBytes+offset, pErrorCode);
 467         if(U_FAILURE(*pErrorCode)) {
 468             udata_printError(ds, "udata_swapPackage() failed to swap the data item name strings\n");
 469             return 0;
 470         }
 471         /* keep offset and itemLength in case we allocate and copy the strings below */
 472
 473         /* swap the package names into the output charset */
 474         if(ds->outCharset!=U_CHARSET_FAMILY) {
 475             UDataSwapper *ds2;
 476             ds2=udata_openSwapper(TRUE, U_CHARSET_FAMILY, TRUE, ds->outCharset, pErrorCode);
 477             ds2->swapInvChars(ds2, inPkgName, inPkgNameLength, inPkgName, pErrorCode);
 478             ds2->swapInvChars(ds2, outPkgName, outPkgNameLength, outPkgName, pErrorCode);
 479             udata_closeSwapper(ds2);
 480             if(U_FAILURE(*pErrorCode)) {
 481                 udata_printError(ds, "udata_swapPackage() failed to swap the input/output package names\n");
 482             }
 483         }
 484
 485         /* change the prefix of each ToC entry name from the old to the new package name */
 486         {
 487             char *entryName;
 488
 489             for(i=0; i<itemCount; ++i) {
 490                 entryName=(char *)inBytes+ds->readUInt32(inEntries[i].nameOffset);
 491
 492                 if(0==uprv_memcmp(entryName, inPkgName, inPkgNameLength)) {
 493                     uprv_memcpy(entryName, outPkgName, inPkgNameLength);
 494                 } else {
 495                     udata_printError(ds, "udata_swapPackage() failed: ToC item %ld does not have the input package name as a prefix\n",
 496                                      (long)i);
 497                     *pErrorCode=U_INVALID_FORMAT_ERROR;
 498                     return 0;
 499                 }
 500             }
 501         }
 502
 503         /*
 504          * Allocate the ToC table and, if necessary, a temporary buffer for
 505          * pseudo-in-place swapping.
 506          *
 507          * We cannot swap in-place because:
 508          *
 509          * 1. If the swapping of an item fails mid-way, then in-place swapping
 510          * has destroyed its data.
 511          * Out-of-place swapping allows us to then copy its original data.
 512          *
 513          * 2. If swapping changes the charset family, then we must resort
 514          * not only the ToC table but also the data items themselves.
 515          * This requires a permutation and is best done with separate in/out
 516          * buffers.
 517          *
 518          * We swapped the strings above to avoid the malloc below if string swapping fails.
 519          */
 520         if(inData==outData) {
 521             /* +15: prepare for extra padding of a newly-last item */
 522             table=(ToCEntry *)uprv_malloc(itemCount*sizeof(ToCEntry)+length+15);
 523             if(table!=NULL) {
 524                 outBytes=(uint8_t *)(table+itemCount);
 525
 526                 /* copy the item count and the swapped strings */
 527                 uprv_memcpy(outBytes, inBytes, 4);
 528                 uprv_memcpy(outBytes+offset, inBytes+offset, itemLength);
 529             }
 530         } else {
 531             table=(ToCEntry *)uprv_malloc(itemCount*sizeof(ToCEntry));
 532         }
 533         if(table==NULL) {
 534             udata_printError(ds, "udata_swapPackage(): out of memory allocating %d bytes\n",
 535                              inData==outData ?
 536                                  itemCount*sizeof(ToCEntry)+length+15 :
 537                                  itemCount*sizeof(ToCEntry));
 538             *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
 539             return 0;
 540         }
 541         outEntries=(UDataOffsetTOCEntry *)(outBytes+4);
 542
 543         /* read the ToC table */
 544         for(i=0; i<itemCount; ++i) {
 545             table[i].nameOffset=ds->readUInt32(inEntries[i].nameOffset);
 546             table[i].inOffset=ds->readUInt32(inEntries[i].dataOffset);
 547             if(i>0) {
 548                 table[i-1].length=table[i].inOffset-table[i-1].inOffset;
 549             }
 550         }
 551         table[itemCount-1].length=(uint32_t)length-table[itemCount-1].inOffset;
 552
 553         if(ds->inCharset==ds->outCharset) {
 554             /* no charset swapping, no resorting: keep item offsets the same */
 555             for(i=0; i<itemCount; ++i) {
 556                 table[i].outOffset=table[i].inOffset;
 557             }
 558         } else {
 559             /* charset swapping: resort items by their swapped names */
 560
 561             /*
 562              * Before the actual sorting, we need to make sure that each item
 563              * has a length that is a multiple of 16 bytes so that all items
 564              * are 16-aligned.
 565              * Only the old last item may be missing up to 15 padding bytes.
 566              * Add padding bytes for it.
 567              * Since the icuswap main() function has already allocated enough
 568              * input buffer space and set the last 15 bytes there to 0xaa,
 569              * we only need to increase the total data length and the length
 570              * of the last item here.
 571              */
 572             if((length&0xf)!=0) {
 573                 int32_t delta=16-(length&0xf);
 574                 length+=delta;
 575                 table[itemCount-1].length+=(uint32_t)delta;
 576             }
 577
 578             /* Save the offset before we sort the TOC. */
 579             offset=table[0].inOffset;
 580             /* sort the TOC entries */
 581             uprv_sortArray(table, (int32_t)itemCount, (int32_t)sizeof(ToCEntry),
 582                            compareToCEntries, outBytes, FALSE, pErrorCode);
 583
 584             /*
 585              * Note: Before sorting, the inOffset values were in order.
 586              * Now the outOffset values are in order.
 587              */
 588
 589             /* assign outOffset values */
 590             for(i=0; i<itemCount; ++i) {
 591                 table[i].outOffset=offset;
 592                 offset+=table[i].length;
 593             }
 594         }
 595
 596         /* write the output ToC table */
 597         for(i=0; i<itemCount; ++i) {
 598             ds->writeUInt32(&outEntries[i].nameOffset, table[i].nameOffset);
 599             ds->writeUInt32(&outEntries[i].dataOffset, table[i].outOffset);
 600         }
 601
 602         /* swap each data item */
 603         for(i=0; i<itemCount; ++i) {
 604             /* first copy the item bytes to make sure that unreachable bytes are copied */
 605             uprv_memcpy(outBytes+table[i].outOffset, inBytes+table[i].inOffset, table[i].length);
 606
 607             /* swap the item */
 608             udata_swap(ds, inBytes+table[i].inOffset, (int32_t)table[i].length,
 609                           outBytes+table[i].outOffset, pErrorCode);
 610
 611             if(U_FAILURE(*pErrorCode)) {
 612                 if(ds->outCharset==U_CHARSET_FAMILY) {
 613                     udata_printError(ds, "warning: udata_swapPackage() failed to swap item \"%s\"\n"
 614                                          "    at inOffset 0x%x length 0x%x - %s\n"
 615                                          "    the data item will be copied, not swapped\n\n",
 616                                      (char *)outBytes+table[i].nameOffset,
 617                                      table[i].inOffset, table[i].length, u_errorName(*pErrorCode));
 618                 } else {
 619                     udata_printError(ds, "warning: udata_swapPackage() failed to swap an item\n"
 620                                          "    at inOffset 0x%x length 0x%x - %s\n"
 621                                          "    the data item will be copied, not swapped\n\n",
 622                                      table[i].inOffset, table[i].length, u_errorName(*pErrorCode));
 623                 }
 624                 /* reset the error code, copy the data item, and continue */
 625                 *pErrorCode=U_ZERO_ERROR;
 626                 uprv_memcpy(outBytes+table[i].outOffset, inBytes+table[i].inOffset, table[i].length);
 627             }
 628         }
 629
 630         if(inData==outData) {
 631             /* copy the data from the temporary buffer to the in-place buffer */
 632             uprv_memcpy((uint8_t *)outData+headerSize, outBytes, length);
 633         }
 634         uprv_free(table);
 635
 636         return headerSize+length;
 637     }
 638 }
 639
 640 /*
 641  * Hey, Emacs, please set the following:
 642  *
 643  * Local Variables:
 644  * indent-tabs-mode: nil
 645  * End:
 646  *
 647  */