dlls/lzexpand/lzexpand_main.c

   1 /*
   2  * LZ Decompression functions
   3  *
   4  * Copyright 1996 Marcus Meissner
   5  */
   6 /*
   7  * FIXME: return values might be wrong
   8  */
   9
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <sys/types.h>
  13 #include <unistd.h>
  14 #include "windef.h"
  15 #include "winbase.h"
  16 #include "wine/winbase16.h"
  17 #include "wine/winestring.h"
  18 #include "file.h"
  19 #include "heap.h"
  20 #include "lzexpand.h"
  21 #include "debugtools.h"
  22
  23 DEFAULT_DEBUG_CHANNEL(file);
  24
  25
  26 /* The readahead length of the decompressor. Reading single bytes
  27  * using _lread() would be SLOW.
  28  */
  29 #define GETLEN  2048
  30
  31 /* Format of first 14 byte of LZ compressed file */
  32 struct lzfileheader {
  33         BYTE    magic[8];
  34         BYTE    compressiontype;
  35         CHAR    lastchar;
  36         DWORD   reallength;
  37 };
  38 static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
  39
  40 struct lzstate {
  41         HFILE   realfd;         /* the real filedescriptor */
  42         CHAR    lastchar;       /* the last char of the filename */
  43
  44         DWORD   reallength;     /* the decompressed length of the file */
  45         DWORD   realcurrent;    /* the position the decompressor currently is */
  46         DWORD   realwanted;     /* the position the user wants to read from */
  47
  48         BYTE    table[0x1000];  /* the rotating LZ table */
  49         UINT    curtabent;      /* CURrent TABle ENTry */
  50
  51         BYTE    stringlen;      /* length and position of current string */
  52         DWORD   stringpos;      /* from stringtable */
  53
  54
  55         WORD    bytetype;       /* bitmask within blocks */
  56
  57         BYTE    *get;           /* GETLEN bytes */
  58         DWORD   getcur;         /* current read */
  59         DWORD   getlen;         /* length last got */
  60 };
  61
  62 #define MAX_LZSTATES 16
  63 static struct lzstate *lzstates[MAX_LZSTATES];
  64
  65 #define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
  66 #define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL)
  67
  68 /* reads one compressed byte, including buffering */
  69 #define GET(lzs,b)      _lzget(lzs,&b)
  70 #define GET_FLUSH(lzs)  lzs->getcur=lzs->getlen;
  71
  72 static int
  73 _lzget(struct lzstate *lzs,BYTE *b) {
  74         if (lzs->getcur<lzs->getlen) {
  75                 *b              = lzs->get[lzs->getcur++];
  76                 return          1;
  77         } else {
  78                 int ret = _lread(lzs->realfd,lzs->get,GETLEN);
  79                 if (ret==HFILE_ERROR)
  80                         return HFILE_ERROR;
  81                 if (ret==0)
  82                         return 0;
  83                 lzs->getlen     = ret;
  84                 lzs->getcur     = 1;
  85                 *b              = *(lzs->get);
  86                 return 1;
  87         }
  88 }
  89 /* internal function, reads lzheader
  90  * returns BADINHANDLE for non filedescriptors
  91  * return 0 for file not compressed using LZ
  92  * return UNKNOWNALG for unknown algorithm
  93  * returns lzfileheader in *head
  94  */
  95 static INT read_header(HFILE fd,struct lzfileheader *head)
  96 {
  97         BYTE    buf[14];
  98
  99         if (_llseek(fd,0,SEEK_SET)==-1)
 100                 return LZERROR_BADINHANDLE;
 101
 102         /* We can't directly read the lzfileheader struct due to
 103          * structure element alignment
 104          */
 105         if (_lread(fd,buf,14)<14)
 106                 return 0;
 107         memcpy(head->magic,buf,8);
 108         memcpy(&(head->compressiontype),buf+8,1);
 109         memcpy(&(head->lastchar),buf+9,1);
 110
 111         /* FIXME: consider endianess on non-intel architectures */
 112         memcpy(&(head->reallength),buf+10,4);
 113
 114         if (memcmp(head->magic,LZMagic,8))
 115                 return 0;
 116         if (head->compressiontype!='A')
 117                 return LZERROR_UNKNOWNALG;
 118         return 1;
 119 }
 120
 121 /***********************************************************************
 122  *           LZStart16   (LZEXPAND.7)
 123  */
 124 INT16 WINAPI LZStart16(void)
 125 {
 126     TRACE("(void)\n");
 127     return 1;
 128 }
 129
 130
 131 /***********************************************************************
 132  *           LZStart32   (LZ32.6)
 133  */
 134 INT WINAPI LZStart(void)
 135 {
 136     TRACE("(void)\n");
 137     return 1;
 138 }
 139
 140
 141 /***********************************************************************
 142  *           LZInit16   (LZEXPAND.3)
 143  */
 144 HFILE16 WINAPI LZInit16( HFILE16 hfSrc )
 145 {
 146     HFILE ret = LZInit( FILE_GetHandle(hfSrc) );
 147     if (IS_LZ_HANDLE(ret)) return ret;
 148     if ((INT)ret <= 0) return ret;
 149     return hfSrc;
 150 }
 151
 152
 153 /***********************************************************************
 154  *           LZInit32   (LZ32.2)
 155  *
 156  * initializes internal decompression buffers, returns lzfiledescriptor.
 157  * (return value the same as hfSrc, if hfSrc is not compressed)
 158  * on failure, returns error code <0
 159  * lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
 160  *
 161  * since _llseek uses the same types as libc.lseek, we just use the macros of
 162  *  libc
 163  */
 164 HFILE WINAPI LZInit( HFILE hfSrc )
 165 {
 166
 167         struct  lzfileheader    head;
 168         struct  lzstate         *lzs;
 169         DWORD   ret;
 170         int i;
 171
 172         TRACE("(%d)\n",hfSrc);
 173         ret=read_header(hfSrc,&head);
 174         if (ret<=0) {
 175                 _llseek(hfSrc,0,SEEK_SET);
 176                 return ret?ret:hfSrc;
 177         }
 178         for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
 179         if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
 180         lzstates[i] = lzs = HeapAlloc( GetProcessHeap(), 0, sizeof(struct lzstate) );
 181
 182         memset(lzs,'\0',sizeof(*lzs));
 183         lzs->realfd     = hfSrc;
 184         lzs->lastchar   = head.lastchar;
 185         lzs->reallength = head.reallength;
 186
 187         lzs->get        = HEAP_xalloc( GetProcessHeap(), 0, GETLEN );
 188         lzs->getlen     = 0;
 189         lzs->getcur     = 0;
 190
 191         /* Yes, preinitialize with spaces */
 192         memset(lzs->table,' ',0x1000);
 193         /* Yes, start 16 byte from the END of the table */
 194         lzs->curtabent  = 0xff0;
 195         return 0x400 + i;
 196 }
 197
 198
 199 /***********************************************************************
 200  *           LZDone   (LZEXPAND.9) (LZ32.8)
 201  */
 202 void WINAPI LZDone(void)
 203 {
 204     TRACE("(void)\n");
 205 }
 206
 207
 208 /***********************************************************************
 209  *           GetExpandedName16   (LZEXPAND.10)
 210  */
 211 INT16 WINAPI GetExpandedName16( LPCSTR in, LPSTR out )
 212 {
 213     return (INT16)GetExpandedNameA( in, out );
 214 }
 215
 216
 217 /***********************************************************************
 218  *           GetExpandedName32A   (LZ32.9)
 219  *
 220  * gets the full filename of the compressed file 'in' by opening it
 221  * and reading the header
 222  *
 223  * "file." is being translated to "file"
 224  * "file.bl_" (with lastchar 'a') is being translated to "file.bla"
 225  * "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
 226  */
 227
 228 INT WINAPI GetExpandedNameA( LPCSTR in, LPSTR out )
 229 {
 230         struct lzfileheader     head;
 231         HFILE           fd;
 232         OFSTRUCT        ofs;
 233         INT             fnislowercased,ret,len;
 234         LPSTR           s,t;
 235
 236         TRACE("(%s)\n",in);
 237         fd=OpenFile(in,&ofs,OF_READ);
 238         if (fd==HFILE_ERROR)
 239                 return (INT)(INT16)LZERROR_BADINHANDLE;
 240         strcpy(out,in);
 241         ret=read_header(fd,&head);
 242         if (ret<=0) {
 243                 /* not a LZ compressed file, so the expanded name is the same
 244                  * as the input name */
 245                 _lclose(fd);
 246                 return 1;
 247         }
 248
 249
 250         /* look for directory prefix and skip it. */
 251         s=out;
 252         while (NULL!=(t=strpbrk(s,"/\\:")))
 253                 s=t+1;
 254
 255         /* now mangle the basename */
 256         if (!*s) {
 257                 /* FIXME: hmm. shouldn't happen? */
 258                 WARN("Specified a directory or what? (%s)\n",in);
 259                 _lclose(fd);
 260                 return 1;
 261         }
 262         /* see if we should use lowercase or uppercase on the last char */
 263         fnislowercased=1;
 264         t=s+strlen(s)-1;
 265         while (t>=out) {
 266                 if (!isalpha(*t)) {
 267                         t--;
 268                         continue;
 269                 }
 270                 fnislowercased=islower(*t);
 271                 break;
 272         }
 273         if (isalpha(head.lastchar)) {
 274                 if (fnislowercased)
 275                         head.lastchar=tolower(head.lastchar);
 276                 else
 277                         head.lastchar=toupper(head.lastchar);
 278         }
 279
 280         /* now look where to replace the last character */
 281         if (NULL!=(t=strchr(s,'.'))) {
 282                 if (t[1]=='\0') {
 283                         t[0]='\0';
 284                 } else {
 285                         len=strlen(t)-1;
 286                         if (t[len]=='_')
 287                                 t[len]=head.lastchar;
 288                 }
 289         } /* else no modification necessary */
 290         _lclose(fd);
 291         return 1;
 292 }
 293
 294
 295 /***********************************************************************
 296  *           GetExpandedName32W   (LZ32.11)
 297  */
 298 INT WINAPI GetExpandedNameW( LPCWSTR in, LPWSTR out )
 299 {
 300         char    *xin,*xout;
 301         INT     ret;
 302
 303         xout    = HeapAlloc( GetProcessHeap(), 0, lstrlenW(in)+3 );
 304         xin     = HEAP_strdupWtoA( GetProcessHeap(), 0, in );
 305         ret     = GetExpandedName16(xin,xout);
 306         if (ret>0) lstrcpyAtoW(out,xout);
 307         HeapFree( GetProcessHeap(), 0, xin );
 308         HeapFree( GetProcessHeap(), 0, xout );
 309         return  ret;
 310 }
 311
 312
 313 /***********************************************************************
 314  *           LZRead16   (LZEXPAND.5)
 315  */
 316 INT16 WINAPI LZRead16( HFILE16 fd, LPVOID buf, UINT16 toread )
 317 {
 318     if (IS_LZ_HANDLE(fd)) return LZRead( fd, buf, toread );
 319     return _lread16( fd, buf, toread );
 320 }
 321
 322
 323 /***********************************************************************
 324  *           LZRead32   (LZ32.4)
 325  */
 326 INT WINAPI LZRead( HFILE fd, LPVOID vbuf, UINT toread )
 327 {
 328         int     howmuch;
 329         BYTE    b,*buf;
 330         struct  lzstate *lzs;
 331
 332         buf=(LPBYTE)vbuf;
 333         TRACE("(%d,%p,%d)\n",fd,buf,toread);
 334         howmuch=toread;
 335         if (!(lzs = GET_LZ_STATE(fd))) return _lread(fd,buf,toread);
 336
 337 /* The decompressor itself is in a define, cause we need it twice
 338  * in this function. (the decompressed byte will be in b)
 339  */
 340 #define DECOMPRESS_ONE_BYTE                                             \
 341                 if (lzs->stringlen) {                                   \
 342                         b               = lzs->table[lzs->stringpos];   \
 343                         lzs->stringpos  = (lzs->stringpos+1)&0xFFF;     \
 344                         lzs->stringlen--;                               \
 345                 } else {                                                \
 346                         if (!(lzs->bytetype&0x100)) {                   \
 347                                 if (1!=GET(lzs,b))                      \
 348                                         return toread-howmuch;          \
 349                                 lzs->bytetype = b|0xFF00;               \
 350                         }                                               \
 351                         if (lzs->bytetype & 1) {                        \
 352                                 if (1!=GET(lzs,b))                      \
 353                                         return toread-howmuch;          \
 354                         } else {                                        \
 355                                 BYTE    b1,b2;                          \
 356                                                                         \
 357                                 if (1!=GET(lzs,b1))                     \
 358                                         return toread-howmuch;          \
 359                                 if (1!=GET(lzs,b2))                     \
 360                                         return toread-howmuch;          \
 361                                 /* Format:                              \
 362                                  * b1 b2                                \
 363                                  * AB CD                                \
 364                                  * where CAB is the stringoffset in the table\
 365                                  * and D+3 is the len of the string     \
 366                                  */                                     \
 367                                 lzs->stringpos  = b1|((b2&0xf0)<<4);    \
 368                                 lzs->stringlen  = (b2&0xf)+2;           \
 369                                 /* 3, but we use a  byte already below ... */\
 370                                 b               = lzs->table[lzs->stringpos];\
 371                                 lzs->stringpos  = (lzs->stringpos+1)&0xFFF;\
 372                         }                                               \
 373                         lzs->bytetype>>=1;                              \
 374                 }                                                       \
 375                 /* store b in table */                                  \
 376                 lzs->table[lzs->curtabent++]= b;                        \
 377                 lzs->curtabent  &= 0xFFF;                               \
 378                 lzs->realcurrent++;
 379
 380         /* if someone has seeked, we have to bring the decompressor
 381          * to that position
 382          */
 383         if (lzs->realcurrent!=lzs->realwanted) {
 384                 /* if the wanted position is before the current position
 385                  * I see no easy way to unroll ... We have to restart at
 386                  * the beginning. *sigh*
 387                  */
 388                 if (lzs->realcurrent>lzs->realwanted) {
 389                         /* flush decompressor state */
 390                         _llseek(lzs->realfd,14,SEEK_SET);
 391                         GET_FLUSH(lzs);
 392                         lzs->realcurrent= 0;
 393                         lzs->bytetype   = 0;
 394                         lzs->stringlen  = 0;
 395                         memset(lzs->table,' ',0x1000);
 396                         lzs->curtabent  = 0xFF0;
 397                 }
 398                 while (lzs->realcurrent<lzs->realwanted) {
 399                         DECOMPRESS_ONE_BYTE;
 400                 }
 401         }
 402
 403         while (howmuch) {
 404                 DECOMPRESS_ONE_BYTE;
 405                 lzs->realwanted++;
 406                 *buf++          = b;
 407                 howmuch--;
 408         }
 409         return  toread;
 410 #undef DECOMPRESS_ONE_BYTE
 411 }
 412
 413
 414 /***********************************************************************
 415  *           LZSeek16   (LZEXPAND.4)
 416  */
 417 LONG WINAPI LZSeek16( HFILE16 fd, LONG off, INT16 type )
 418 {
 419     if (IS_LZ_HANDLE(fd)) return LZSeek( fd, off, type );
 420     return _llseek16( fd, off, type );
 421 }
 422
 423
 424 /***********************************************************************
 425  *           LZSeek32   (LZ32.3)
 426  */
 427 LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
 428 {
 429         struct  lzstate *lzs;
 430         LONG    newwanted;
 431
 432         TRACE("(%d,%ld,%d)\n",fd,off,type);
 433         /* not compressed? just use normal _llseek() */
 434         if (!(lzs = GET_LZ_STATE(fd))) return _llseek(fd,off,type);
 435         newwanted = lzs->realwanted;
 436         switch (type) {
 437         case 1: /* SEEK_CUR */
 438                 newwanted      += off;
 439                 break;
 440         case 2: /* SEEK_END */
 441                 newwanted       = lzs->reallength-off;
 442                 break;
 443         default:/* SEEK_SET */
 444                 newwanted       = off;
 445                 break;
 446         }
 447         if (newwanted>lzs->reallength)
 448                 return LZERROR_BADVALUE;
 449         if (newwanted<0)
 450                 return LZERROR_BADVALUE;
 451         lzs->realwanted = newwanted;
 452         return newwanted;
 453 }
 454
 455
 456 /***********************************************************************
 457  *           LZCopy16   (LZEXPAND.1)
 458  *
 459  */
 460 LONG WINAPI LZCopy16( HFILE16 src, HFILE16 dest )
 461 {
 462     /* already a LZ handle? */
 463     if (IS_LZ_HANDLE(src)) return LZCopy( src, FILE_GetHandle(dest) );
 464
 465     /* no, try to open one */
 466     src = LZInit16(src);
 467     if ((INT16)src <= 0) return 0;
 468     if (IS_LZ_HANDLE(src))
 469     {
 470         LONG ret = LZCopy( src, FILE_GetHandle(dest) );
 471         LZClose( src );
 472         return ret;
 473     }
 474     /* it was not a compressed file */
 475     return LZCopy( FILE_GetHandle(src), FILE_GetHandle(dest) );
 476 }
 477
 478
 479 /***********************************************************************
 480  *           LZCopy32   (LZ32.0)
 481  *
 482  * Copies everything from src to dest
 483  * if src is a LZ compressed file, it will be uncompressed.
 484  * will return the number of bytes written to dest or errors.
 485  */
 486 LONG WINAPI LZCopy( HFILE src, HFILE dest )
 487 {
 488         int     usedlzinit=0,ret,wret;
 489         LONG    len;
 490         HFILE   oldsrc = src;
 491 #define BUFLEN  1000
 492         BYTE    buf[BUFLEN];
 493         /* we need that weird typedef, for i can't seem to get function pointer
 494          * casts right. (Or they probably just do not like WINAPI in general)
 495          */
 496         typedef UINT    WINAPI (*_readfun)(HFILE,LPVOID,UINT);
 497
 498         _readfun        xread;
 499
 500         TRACE("(%d,%d)\n",src,dest);
 501         if (!IS_LZ_HANDLE(src)) {
 502                 src = LZInit(src);
 503                 if ((INT)src <= 0) return 0;
 504                 if (src != oldsrc) usedlzinit=1;
 505         }
 506
 507         /* not compressed? just copy */
 508         if (!IS_LZ_HANDLE(src))
 509                 xread=_lread;
 510         else
 511                 xread=(_readfun)LZRead;
 512         len=0;
 513         while (1) {
 514                 ret=xread(src,buf,BUFLEN);
 515                 if (ret<=0) {
 516                         if (ret==0)
 517                                 break;
 518                         if (ret==-1)
 519                                 return LZERROR_READ;
 520                         return ret;
 521                 }
 522                 len    += ret;
 523                 wret    = _lwrite(dest,buf,ret);
 524                 if (wret!=ret)
 525                         return LZERROR_WRITE;
 526         }
 527         if (usedlzinit)
 528                 LZClose(src);
 529         return len;
 530 #undef BUFLEN
 531 }
 532
 533 /* reverses GetExpandedPathname */
 534 static LPSTR LZEXPAND_MangleName( LPCSTR fn )
 535 {
 536     char *p;
 537     char *mfn = (char *)HEAP_xalloc( GetProcessHeap(), 0,
 538                                      strlen(fn) + 3 ); /* "._" and \0 */
 539     strcpy( mfn, fn );
 540     if (!(p = strrchr( mfn, '\\' ))) p = mfn;
 541     if ((p = strchr( p, '.' )))
 542     {
 543         p++;
 544         if (strlen(p) < 3) strcat( p, "_" );  /* append '_' */
 545         else p[strlen(p)-1] = '_';  /* replace last character */
 546     }
 547     else strcat( mfn, "._" );   /* append "._" */
 548     return mfn;
 549 }
 550
 551
 552 /***********************************************************************
 553  *           LZOpenFile16   (LZEXPAND.2)
 554  */
 555 HFILE16 WINAPI LZOpenFile16( LPCSTR fn, LPOFSTRUCT ofs, UINT16 mode )
 556 {
 557     HFILE hfret = LZOpenFileA( fn, ofs, mode );
 558     /* return errors and LZ handles unmodified */
 559     if ((INT)hfret <= 0) return hfret;
 560     if (IS_LZ_HANDLE(hfret)) return hfret;
 561     /* but allocate a dos handle for 'normal' files */
 562     return FILE_AllocDosHandle(hfret);
 563 }
 564
 565
 566 /***********************************************************************
 567  *           LZOpenFile32A   (LZ32.1)
 568  *
 569  * Opens a file. If not compressed, open it as a normal file.
 570  */
 571 HFILE WINAPI LZOpenFileA( LPCSTR fn, LPOFSTRUCT ofs, UINT mode )
 572 {
 573         HFILE   fd,cfd;
 574
 575         TRACE("(%s,%p,%d)\n",fn,ofs,mode);
 576         /* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
 577         fd=OpenFile(fn,ofs,mode);
 578         if (fd==HFILE_ERROR)
 579         {
 580             LPSTR mfn = LZEXPAND_MangleName(fn);
 581             fd = OpenFile(mfn,ofs,mode);
 582             HeapFree( GetProcessHeap(), 0, mfn );
 583         }
 584         if ((mode&~0x70)!=OF_READ)
 585                 return fd;
 586         if (fd==HFILE_ERROR)
 587                 return HFILE_ERROR;
 588         cfd=LZInit(fd);
 589         if ((INT)cfd <= 0) return fd;
 590         return cfd;
 591 }
 592
 593
 594 /***********************************************************************
 595  *           LZOpenFile32W   (LZ32.10)
 596  */
 597 HFILE WINAPI LZOpenFileW( LPCWSTR fn, LPOFSTRUCT ofs, UINT mode )
 598 {
 599         LPSTR   xfn;
 600         LPWSTR  yfn;
 601         HFILE   ret;
 602
 603         xfn     = HEAP_strdupWtoA( GetProcessHeap(), 0, fn);
 604         ret     = LZOpenFile16(xfn,ofs,mode);
 605         HeapFree( GetProcessHeap(), 0, xfn );
 606         if (ret!=HFILE_ERROR) {
 607                 /* ofs->szPathName is an array with the OFSTRUCT */
 608                 yfn = HEAP_strdupAtoW( GetProcessHeap(), 0, ofs->szPathName );
 609                 memcpy(ofs->szPathName,yfn,lstrlenW(yfn)*2+2);
 610                 HeapFree( GetProcessHeap(), 0, yfn );
 611         }
 612         return  ret;
 613 }
 614
 615
 616 /***********************************************************************
 617  *           LZClose16   (LZEXPAND.6)
 618  */
 619 void WINAPI LZClose16( HFILE16 fd )
 620 {
 621     if (IS_LZ_HANDLE(fd)) LZClose( fd );
 622     else _lclose16( fd );
 623 }
 624
 625
 626 /***********************************************************************
 627  *           LZClose32   (LZ32.5)
 628  */
 629 void WINAPI LZClose( HFILE fd )
 630 {
 631         struct lzstate *lzs;
 632
 633         TRACE("(%d)\n",fd);
 634         if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
 635         else
 636         {
 637             if (lzs->get) HeapFree( GetProcessHeap(), 0, lzs->get );
 638             CloseHandle(lzs->realfd);
 639             lzstates[fd - 0x400] = NULL;
 640             HeapFree( GetProcessHeap(), 0, lzs );
 641         }
 642 }
 643
 644 /***********************************************************************
 645  *           CopyLZFile16   (LZEXPAND.8)
 646  */
 647 LONG WINAPI CopyLZFile16( HFILE16 src, HFILE16 dest )
 648 {
 649     TRACE("(%d,%d)\n",src,dest);
 650     return LZCopy16(src,dest);
 651 }
 652
 653
 654 /***********************************************************************
 655  *           CopyLZFile32  (LZ32.7)
 656  *
 657  * Copy src to dest (including uncompressing src).
 658  * NOTE: Yes. This is exactly the same function as LZCopy.
 659  */
 660 LONG WINAPI CopyLZFile( HFILE src, HFILE dest )
 661 {
 662     TRACE("(%d,%d)\n",src,dest);
 663     return LZCopy(src,dest);
 664 }