misc/lzexpand.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 "windows.h"
  13 #include "file.h"
  14 #include "heap.h"
  15 #include "lzexpand.h"
  16 #include "debug.h"
  17
  18
  19 /* The readahead length of the decompressor. Reading single bytes
  20  * using _lread() would be SLOW.
  21  */
  22 #define GETLEN  2048
  23
  24 /* Format of first 14 byte of LZ compressed file */
  25 struct lzfileheader {
  26         BYTE    magic[8];
  27         BYTE    compressiontype;
  28         CHAR    lastchar;
  29         DWORD   reallength;
  30 };
  31 static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
  32
  33 struct lzstate {
  34         HFILE32 realfd;         /* the real filedescriptor */
  35         CHAR    lastchar;       /* the last char of the filename */
  36
  37         DWORD   reallength;     /* the decompressed length of the file */
  38         DWORD   realcurrent;    /* the position the decompressor currently is */
  39         DWORD   realwanted;     /* the position the user wants to read from */
  40
  41         BYTE    table[0x1000];  /* the rotating LZ table */
  42         UINT32  curtabent;      /* CURrent TABle ENTry */
  43
  44         BYTE    stringlen;      /* length and position of current string */
  45         DWORD   stringpos;      /* from stringtable */
  46
  47
  48         WORD    bytetype;       /* bitmask within blocks */
  49
  50         BYTE    *get;           /* GETLEN bytes */
  51         DWORD   getcur;         /* current read */
  52         DWORD   getlen;         /* length last got */
  53 };
  54
  55 #define MAX_LZSTATES 16
  56 static struct lzstate *lzstates[MAX_LZSTATES];
  57
  58 #define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
  59 #define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL)
  60
  61 /* reads one compressed byte, including buffering */
  62 #define GET(lzs,b)      _lzget(lzs,&b)
  63 #define GET_FLUSH(lzs)  lzs->getcur=lzs->getlen;
  64
  65 static int
  66 _lzget(struct lzstate *lzs,BYTE *b) {
  67         if (lzs->getcur<lzs->getlen) {
  68                 *b              = lzs->get[lzs->getcur++];
  69                 return          1;
  70         } else {
  71                 int ret = _lread32(lzs->realfd,lzs->get,GETLEN);
  72                 if (ret==HFILE_ERROR32)
  73                         return HFILE_ERROR32;
  74                 if (ret==0)
  75                         return 0;
  76                 lzs->getlen     = ret;
  77                 lzs->getcur     = 1;
  78                 *b              = *(lzs->get);
  79                 return 1;
  80         }
  81 }
  82 /* internal function, reads lzheader
  83  * returns BADINHANDLE for non filedescriptors
  84  * return 0 for file not compressed using LZ
  85  * return UNKNOWNALG for unknown algorithm
  86  * returns lzfileheader in *head
  87  */
  88 static INT32 read_header(HFILE32 fd,struct lzfileheader *head)
  89 {
  90         BYTE    buf[14];
  91
  92         if (_llseek32(fd,0,SEEK_SET)==-1)
  93                 return LZERROR_BADINHANDLE;
  94
  95         /* We can't directly read the lzfileheader struct due to
  96          * structure element alignment
  97          */
  98         if (_lread32(fd,buf,14)<14)
  99                 return 0;
 100         memcpy(head->magic,buf,8);
 101         memcpy(&(head->compressiontype),buf+8,1);
 102         memcpy(&(head->lastchar),buf+9,1);
 103
 104         /* FIXME: consider endianess on non-intel architectures */
 105         memcpy(&(head->reallength),buf+10,4);
 106
 107         if (memcmp(head->magic,LZMagic,8))
 108                 return 0;
 109         if (head->compressiontype!='A')
 110                 return LZERROR_UNKNOWNALG;
 111         return 1;
 112 }
 113
 114 /***********************************************************************
 115  *           LZStart16   (LZEXPAND.7)
 116  */
 117 INT16 WINAPI LZStart16(void)
 118 {
 119     TRACE(file,"(void)\n");
 120     return 1;
 121 }
 122
 123
 124 /***********************************************************************
 125  *           LZStart32   (LZ32.6)
 126  */
 127 INT32 WINAPI LZStart32(void)
 128 {
 129     TRACE(file,"(void)\n");
 130     return 1;
 131 }
 132
 133
 134 /***********************************************************************
 135  *           LZInit16   (LZEXPAND.3)
 136  */
 137 HFILE16 WINAPI LZInit16( HFILE16 hfSrc )
 138 {
 139     HFILE32 ret = LZInit32( FILE_GetHandle32(hfSrc) );
 140     if (IS_LZ_HANDLE(ret)) return ret;
 141     if ((INT32)ret <= 0) return ret;
 142     return hfSrc;
 143 }
 144
 145
 146 /***********************************************************************
 147  *           LZInit32   (LZ32.2)
 148  *
 149  * initializes internal decompression buffers, returns lzfiledescriptor.
 150  * (return value the same as hfSrc, if hfSrc is not compressed)
 151  * on failure, returns error code <0
 152  * lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
 153  *
 154  * since _llseek uses the same types as libc.lseek, we just use the macros of
 155  *  libc
 156  */
 157 HFILE32 WINAPI LZInit32( HFILE32 hfSrc )
 158 {
 159
 160         struct  lzfileheader    head;
 161         struct  lzstate         *lzs;
 162         DWORD   ret;
 163         int i;
 164
 165         TRACE(file,"(%d)\n",hfSrc);
 166         ret=read_header(hfSrc,&head);
 167         if (ret<=0) {
 168                 _llseek32(hfSrc,0,SEEK_SET);
 169                 return ret?ret:hfSrc;
 170         }
 171         for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
 172         if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
 173         lzstates[i] = lzs = HeapAlloc( SystemHeap, 0, sizeof(struct lzstate) );
 174
 175         memset(lzs,'\0',sizeof(*lzs));
 176         lzs->realfd     = hfSrc;
 177         lzs->lastchar   = head.lastchar;
 178         lzs->reallength = head.reallength;
 179
 180         lzs->get        = HEAP_xalloc( GetProcessHeap(), 0, GETLEN );
 181         lzs->getlen     = 0;
 182         lzs->getcur     = 0;
 183
 184         /* Yes, preinitialize with spaces */
 185         memset(lzs->table,' ',0x1000);
 186         /* Yes, start 16 byte from the END of the table */
 187         lzs->curtabent  = 0xff0;
 188         return 0x400 + i;
 189 }
 190
 191
 192 /***********************************************************************
 193  *           LZDone   (LZEXPAND.9) (LZ32.8)
 194  */
 195 void WINAPI LZDone(void)
 196 {
 197     TRACE(file,"(void)\n");
 198 }
 199
 200
 201 /***********************************************************************
 202  *           GetExpandedName16   (LZEXPAND.10)
 203  */
 204 INT16 WINAPI GetExpandedName16( LPCSTR in, LPSTR out )
 205 {
 206     return (INT16)GetExpandedName32A( in, out );
 207 }
 208
 209
 210 /***********************************************************************
 211  *           GetExpandedName32A   (LZ32.9)
 212  *
 213  * gets the full filename of the compressed file 'in' by opening it
 214  * and reading the header
 215  *
 216  * "file." is being translated to "file"
 217  * "file.bl_" (with lastchar 'a') is being translated to "file.bla"
 218  * "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
 219  */
 220
 221 INT32 WINAPI GetExpandedName32A( LPCSTR in, LPSTR out )
 222 {
 223         struct lzfileheader     head;
 224         HFILE32         fd;
 225         OFSTRUCT        ofs;
 226         INT32           fnislowercased,ret,len;
 227         LPSTR           s,t;
 228
 229         TRACE(file,"(%s)\n",in);
 230         fd=OpenFile32(in,&ofs,OF_READ);
 231         if (fd==HFILE_ERROR32)
 232                 return (INT32)(INT16)LZERROR_BADINHANDLE;
 233         strcpy(out,in);
 234         ret=read_header(fd,&head);
 235         if (ret<=0) {
 236                 /* not a LZ compressed file, so the expanded name is the same
 237                  * as the input name */
 238                 _lclose32(fd);
 239                 return 1;
 240         }
 241
 242
 243         /* look for directory prefix and skip it. */
 244         s=out;
 245         while (NULL!=(t=strpbrk(s,"/\\:")))
 246                 s=t+1;
 247
 248         /* now mangle the basename */
 249         if (!*s) {
 250                 /* FIXME: hmm. shouldn't happen? */
 251                 WARN(file,"Specified a directory or what? (%s)\n",in);
 252                 _lclose32(fd);
 253                 return 1;
 254         }
 255         /* see if we should use lowercase or uppercase on the last char */
 256         fnislowercased=1;
 257         t=s+strlen(s)-1;
 258         while (t>=out) {
 259                 if (!isalpha(*t)) {
 260                         t--;
 261                         continue;
 262                 }
 263                 fnislowercased=islower(*t);
 264                 break;
 265         }
 266         if (isalpha(head.lastchar)) {
 267                 if (fnislowercased)
 268                         head.lastchar=tolower(head.lastchar);
 269                 else
 270                         head.lastchar=toupper(head.lastchar);
 271         }
 272
 273         /* now look where to replace the last character */
 274         if (NULL!=(t=strchr(s,'.'))) {
 275                 if (t[1]=='\0') {
 276                         t[0]='\0';
 277                 } else {
 278                         len=strlen(t)-1;
 279                         if (t[len]=='_')
 280                                 t[len]=head.lastchar;
 281                 }
 282         } /* else no modification necessary */
 283         _lclose32(fd);
 284         return 1;
 285 }
 286
 287
 288 /***********************************************************************
 289  *           GetExpandedName32W   (LZ32.11)
 290  */
 291 INT32 WINAPI GetExpandedName32W( LPCWSTR in, LPWSTR out )
 292 {
 293         char    *xin,*xout;
 294         INT32   ret;
 295
 296         xout    = HeapAlloc( GetProcessHeap(), 0, lstrlen32W(in)+3 );
 297         xin     = HEAP_strdupWtoA( GetProcessHeap(), 0, in );
 298         ret     = GetExpandedName16(xin,xout);
 299         if (ret>0) lstrcpyAtoW(out,xout);
 300         HeapFree( GetProcessHeap(), 0, xin );
 301         HeapFree( GetProcessHeap(), 0, xout );
 302         return  ret;
 303 }
 304
 305
 306 /***********************************************************************
 307  *           LZRead16   (LZEXPAND.5)
 308  */
 309 INT16 WINAPI LZRead16( HFILE16 fd, LPVOID buf, UINT16 toread )
 310 {
 311     if (IS_LZ_HANDLE(fd)) return LZRead32( fd, buf, toread );
 312     return _lread16( fd, buf, toread );
 313 }
 314
 315
 316 /***********************************************************************
 317  *           LZRead32   (LZ32.4)
 318  */
 319 INT32 WINAPI LZRead32( HFILE32 fd, LPVOID vbuf, UINT32 toread )
 320 {
 321         int     howmuch;
 322         BYTE    b,*buf;
 323         struct  lzstate *lzs;
 324
 325         buf=(LPBYTE)vbuf;
 326         TRACE(file,"(%d,%p,%d)\n",fd,buf,toread);
 327         howmuch=toread;
 328         if (!(lzs = GET_LZ_STATE(fd))) return _lread32(fd,buf,toread);
 329
 330 /* The decompressor itself is in a define, cause we need it twice
 331  * in this function. (the decompressed byte will be in b)
 332  */
 333 #define DECOMPRESS_ONE_BYTE                                             \
 334                 if (lzs->stringlen) {                                   \
 335                         b               = lzs->table[lzs->stringpos];   \
 336                         lzs->stringpos  = (lzs->stringpos+1)&0xFFF;     \
 337                         lzs->stringlen--;                               \
 338                 } else {                                                \
 339                         if (!(lzs->bytetype&0x100)) {                   \
 340                                 if (1!=GET(lzs,b))                      \
 341                                         return toread-howmuch;          \
 342                                 lzs->bytetype = b|0xFF00;               \
 343                         }                                               \
 344                         if (lzs->bytetype & 1) {                        \
 345                                 if (1!=GET(lzs,b))                      \
 346                                         return toread-howmuch;          \
 347                         } else {                                        \
 348                                 BYTE    b1,b2;                          \
 349                                                                         \
 350                                 if (1!=GET(lzs,b1))                     \
 351                                         return toread-howmuch;          \
 352                                 if (1!=GET(lzs,b2))                     \
 353                                         return toread-howmuch;          \
 354                                 /* Format:                              \
 355                                  * b1 b2                                \
 356                                  * AB CD                                \
 357                                  * where CAB is the stringoffset in the table\
 358                                  * and D+3 is the len of the string     \
 359                                  */                                     \
 360                                 lzs->stringpos  = b1|((b2&0xf0)<<4);    \
 361                                 lzs->stringlen  = (b2&0xf)+2;           \
 362                                 /* 3, but we use a  byte already below ... */\
 363                                 b               = lzs->table[lzs->stringpos];\
 364                                 lzs->stringpos  = (lzs->stringpos+1)&0xFFF;\
 365                         }                                               \
 366                         lzs->bytetype>>=1;                              \
 367                 }                                                       \
 368                 /* store b in table */                                  \
 369                 lzs->table[lzs->curtabent++]= b;                        \
 370                 lzs->curtabent  &= 0xFFF;                               \
 371                 lzs->realcurrent++;
 372
 373         /* if someone has seeked, we have to bring the decompressor
 374          * to that position
 375          */
 376         if (lzs->realcurrent!=lzs->realwanted) {
 377                 /* if the wanted position is before the current position
 378                  * I see no easy way to unroll ... We have to restart at
 379                  * the beginning. *sigh*
 380                  */
 381                 if (lzs->realcurrent>lzs->realwanted) {
 382                         /* flush decompressor state */
 383                         _llseek32(lzs->realfd,14,SEEK_SET);
 384                         GET_FLUSH(lzs);
 385                         lzs->realcurrent= 0;
 386                         lzs->bytetype   = 0;
 387                         lzs->stringlen  = 0;
 388                         memset(lzs->table,' ',0x1000);
 389                         lzs->curtabent  = 0xFF0;
 390                 }
 391                 while (lzs->realcurrent<lzs->realwanted) {
 392                         DECOMPRESS_ONE_BYTE;
 393                 }
 394         }
 395
 396         while (howmuch) {
 397                 DECOMPRESS_ONE_BYTE;
 398                 lzs->realwanted++;
 399                 *buf++          = b;
 400                 howmuch--;
 401         }
 402         return  toread;
 403 #undef DECOMPRESS_ONE_BYTE
 404 }
 405
 406
 407 /***********************************************************************
 408  *           LZSeek16   (LZEXPAND.4)
 409  */
 410 LONG WINAPI LZSeek16( HFILE16 fd, LONG off, INT16 type )
 411 {
 412     if (IS_LZ_HANDLE(fd)) return LZSeek32( fd, off, type );
 413     return _llseek16( fd, off, type );
 414 }
 415
 416
 417 /***********************************************************************
 418  *           LZSeek32   (LZ32.3)
 419  */
 420 LONG WINAPI LZSeek32( HFILE32 fd, LONG off, INT32 type )
 421 {
 422         struct  lzstate *lzs;
 423         LONG    newwanted;
 424
 425         TRACE(file,"(%d,%ld,%d)\n",fd,off,type);
 426         /* not compressed? just use normal _llseek() */
 427         if (!(lzs = GET_LZ_STATE(fd))) return _llseek32(fd,off,type);
 428         newwanted = lzs->realwanted;
 429         switch (type) {
 430         case 1: /* SEEK_CUR */
 431                 newwanted      += off;
 432                 break;
 433         case 2: /* SEEK_END */
 434                 newwanted       = lzs->reallength-off;
 435                 break;
 436         default:/* SEEK_SET */
 437                 newwanted       = off;
 438                 break;
 439         }
 440         if (newwanted>lzs->reallength)
 441                 return LZERROR_BADVALUE;
 442         if (newwanted<0)
 443                 return LZERROR_BADVALUE;
 444         lzs->realwanted = newwanted;
 445         return newwanted;
 446 }
 447
 448
 449 /***********************************************************************
 450  *           LZCopy16   (LZEXPAND.1)
 451  *
 452  */
 453 LONG WINAPI LZCopy16( HFILE16 src, HFILE16 dest )
 454 {
 455     /* already a LZ handle? */
 456     if (IS_LZ_HANDLE(src)) return LZCopy32( src, FILE_GetHandle32(dest) );
 457
 458     /* no, try to open one */
 459     src = LZInit16(src);
 460     if ((INT16)src <= 0) return 0;
 461     if (IS_LZ_HANDLE(src))
 462     {
 463         LONG ret = LZCopy32( src, FILE_GetHandle32(dest) );
 464         LZClose32( src );
 465         return ret;
 466     }
 467     /* it was not a compressed file */
 468     return LZCopy32( FILE_GetHandle32(src), FILE_GetHandle32(dest) );
 469 }
 470
 471
 472 /***********************************************************************
 473  *           LZCopy32   (LZ32.0)
 474  *
 475  * Copies everything from src to dest
 476  * if src is a LZ compressed file, it will be uncompressed.
 477  * will return the number of bytes written to dest or errors.
 478  */
 479 LONG WINAPI LZCopy32( HFILE32 src, HFILE32 dest )
 480 {
 481         int     usedlzinit=0,ret,wret;
 482         LONG    len;
 483         HFILE32 oldsrc = src;
 484 #define BUFLEN  1000
 485         BYTE    buf[BUFLEN];
 486         UINT32  WINAPI (*xread)(HFILE32,LPVOID,UINT32);
 487
 488         TRACE(file,"(%d,%d)\n",src,dest);
 489         if (!IS_LZ_HANDLE(src)) {
 490                 src = LZInit32(src);
 491                 if ((INT32)src <= 0) return 0;
 492                 if (src != oldsrc) usedlzinit=1;
 493         }
 494
 495         /* not compressed? just copy */
 496         if (!IS_LZ_HANDLE(src))
 497                 xread=_lread32;
 498         else    /* Note: Ignore warning, just mismatched INT/UINT */
 499                 xread=LZRead32;
 500         len=0;
 501         while (1) {
 502                 ret=xread(src,buf,BUFLEN);
 503                 if (ret<=0) {
 504                         if (ret==0)
 505                                 break;
 506                         if (ret==-1)
 507                                 return LZERROR_READ;
 508                         return ret;
 509                 }
 510                 len    += ret;
 511                 wret    = _lwrite32(dest,buf,ret);
 512                 if (wret!=ret)
 513                         return LZERROR_WRITE;
 514         }
 515         if (usedlzinit)
 516                 LZClose32(src);
 517         return len;
 518 #undef BUFLEN
 519 }
 520
 521 /* reverses GetExpandedPathname */
 522 static LPSTR LZEXPAND_MangleName( LPCSTR fn )
 523 {
 524     char *p;
 525     char *mfn = (char *)HEAP_xalloc( GetProcessHeap(), 0,
 526                                      strlen(fn) + 3 ); /* "._" and \0 */
 527     strcpy( mfn, fn );
 528     if (!(p = strrchr( mfn, '\\' ))) p = mfn;
 529     if ((p = strchr( p, '.' )))
 530     {
 531         p++;
 532         if (strlen(p) < 3) strcat( p, "_" );  /* append '_' */
 533         else p[strlen(p)-1] = '_';  /* replace last character */
 534     }
 535     else strcat( mfn, "._" );   /* append "._" */
 536     return mfn;
 537 }
 538
 539
 540 /***********************************************************************
 541  *           LZOpenFile16   (LZEXPAND.2)
 542  */
 543 HFILE16 WINAPI LZOpenFile16( LPCSTR fn, LPOFSTRUCT ofs, UINT16 mode )
 544 {
 545     HFILE32 hfret = LZOpenFile32A( fn, ofs, mode );
 546     /* return errors and LZ handles unmodified */
 547     if ((INT32)hfret <= 0) return hfret;
 548     if (IS_LZ_HANDLE(hfret)) return hfret;
 549     /* but allocate a dos handle for 'normal' files */
 550     return FILE_AllocDosHandle(hfret);
 551 }
 552
 553
 554 /***********************************************************************
 555  *           LZOpenFile32A   (LZ32.1)
 556  *
 557  * Opens a file. If not compressed, open it as a normal file.
 558  */
 559 HFILE32 WINAPI LZOpenFile32A( LPCSTR fn, LPOFSTRUCT ofs, UINT32 mode )
 560 {
 561         HFILE32 fd,cfd;
 562
 563         TRACE(file,"(%s,%p,%d)\n",fn,ofs,mode);
 564         /* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
 565         fd=OpenFile32(fn,ofs,mode);
 566         if (fd==HFILE_ERROR32)
 567         {
 568             LPSTR mfn = LZEXPAND_MangleName(fn);
 569             fd = OpenFile32(mfn,ofs,mode);
 570             HeapFree( GetProcessHeap(), 0, mfn );
 571         }
 572         if ((mode&~0x70)!=OF_READ)
 573                 return fd;
 574         if (fd==HFILE_ERROR32)
 575                 return HFILE_ERROR32;
 576         cfd=LZInit32(fd);
 577         if ((INT32)cfd <= 0) return fd;
 578         return cfd;
 579 }
 580
 581
 582 /***********************************************************************
 583  *           LZOpenFile32W   (LZ32.10)
 584  */
 585 HFILE32 WINAPI LZOpenFile32W( LPCWSTR fn, LPOFSTRUCT ofs, UINT32 mode )
 586 {
 587         LPSTR   xfn;
 588         LPWSTR  yfn;
 589         HFILE32 ret;
 590
 591         xfn     = HEAP_strdupWtoA( GetProcessHeap(), 0, fn);
 592         ret     = LZOpenFile16(xfn,ofs,mode);
 593         HeapFree( GetProcessHeap(), 0, xfn );
 594         if (ret!=HFILE_ERROR32) {
 595                 /* ofs->szPathName is an array with the OFSTRUCT */
 596                 yfn = HEAP_strdupAtoW( GetProcessHeap(), 0, ofs->szPathName );
 597                 memcpy(ofs->szPathName,yfn,lstrlen32W(yfn)*2+2);
 598                 HeapFree( GetProcessHeap(), 0, yfn );
 599         }
 600         return  ret;
 601 }
 602
 603
 604 /***********************************************************************
 605  *           LZClose16   (LZEXPAND.6)
 606  */
 607 void WINAPI LZClose16( HFILE16 fd )
 608 {
 609     if (IS_LZ_HANDLE(fd)) LZClose32( fd );
 610     else _lclose16( fd );
 611 }
 612
 613
 614 /***********************************************************************
 615  *           LZClose32   (LZ32.5)
 616  */
 617 void WINAPI LZClose32( HFILE32 fd )
 618 {
 619         struct lzstate *lzs;
 620
 621         TRACE(file,"(%d)\n",fd);
 622         if (!(lzs = GET_LZ_STATE(fd))) _lclose32(fd);
 623         else
 624         {
 625             if (lzs->get) HeapFree( GetProcessHeap(), 0, lzs->get );
 626             CloseHandle(lzs->realfd);
 627             lzstates[fd - 0x400] = NULL;
 628             HeapFree( SystemHeap, 0, lzs );
 629         }
 630 }
 631
 632 /***********************************************************************
 633  *           CopyLZFile16   (LZEXPAND.8)
 634  */
 635 LONG WINAPI CopyLZFile16( HFILE16 src, HFILE16 dest )
 636 {
 637     TRACE(file,"(%d,%d)\n",src,dest);
 638     return LZCopy16(src,dest);
 639 }
 640
 641
 642 /***********************************************************************
 643  *           CopyLZFile32  (LZ32.7)
 644  *
 645  * Copy src to dest (including uncompressing src).
 646  * NOTE: Yes. This is exactly the same function as LZCopy.
 647  */
 648 LONG WINAPI CopyLZFile32( HFILE32 src, HFILE32 dest )
 649 {
 650     TRACE(file,"(%d,%d)\n",src,dest);
 651     return LZCopy32(src,dest);
 652 }