dlls/lzexpand/lzexpand_main.c

   1 /*
   2  * LZ Decompression functions
   3  *
   4  * Copyright 1996 Marcus Meissner
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * NOTES
  21  *
  22  * The LZ (Lempel Ziv) decompression was used in win16 installation programs.
  23  * It is a simple tabledriven decompression engine, the algorithm is not
  24  * documented as far as I know. WINE does not contain a compressor for
  25  * this format.
  26  *
  27  * The implementation is complete and there have been no reports of failures
  28  * for some time.
  29  *
  30  * TODO:
  31  *
  32  *   o Check whether the return values are correct
  33  *
  34  */
  35
  36 #include "config.h"
  37
  38 #include <string.h>
  39 #include <ctype.h>
  40 #include <sys/types.h>
  41 #include <stdarg.h>
  42 #include <stdio.h>
  43 #ifdef HAVE_UNISTD_H
  44 # include <unistd.h>
  45 #endif
  46
  47 #include "windef.h"
  48 #include "winbase.h"
  49 #include "lzexpand.h"
  50
  51 #include "wine/unicode.h"
  52 #include "wine/debug.h"
  53
  54 WINE_DEFAULT_DEBUG_CHANNEL(file);
  55
  56 /* The readahead length of the decompressor. Reading single bytes
  57  * using _lread() would be SLOW.
  58  */
  59 #define GETLEN  2048
  60
  61 /* Format of first 14 byte of LZ compressed file */
  62 struct lzfileheader {
  63         BYTE    magic[8];
  64         BYTE    compressiontype;
  65         CHAR    lastchar;
  66         DWORD   reallength;
  67 };
  68 static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
  69
  70 struct lzstate {
  71         HFILE   realfd;         /* the real filedescriptor */
  72         CHAR    lastchar;       /* the last char of the filename */
  73
  74         DWORD   reallength;     /* the decompressed length of the file */
  75         DWORD   realcurrent;    /* the position the decompressor currently is */
  76         DWORD   realwanted;     /* the position the user wants to read from */
  77
  78         BYTE    table[0x1000];  /* the rotating LZ table */
  79         UINT    curtabent;      /* CURrent TABle ENTry */
  80
  81         BYTE    stringlen;      /* length and position of current string */
  82         DWORD   stringpos;      /* from stringtable */
  83
  84
  85         WORD    bytetype;       /* bitmask within blocks */
  86
  87         BYTE    *get;           /* GETLEN bytes */
  88         DWORD   getcur;         /* current read */
  89         DWORD   getlen;         /* length last got */
  90 };
  91
  92 #define MAX_LZSTATES 16
  93 static struct lzstate *lzstates[MAX_LZSTATES];
  94
  95 #define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
  96 #define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL)
  97
  98 /* reads one compressed byte, including buffering */
  99 #define GET(lzs,b)      _lzget(lzs,&b)
 100 #define GET_FLUSH(lzs)  lzs->getcur=lzs->getlen;
 101
 102 static int
 103 _lzget(struct lzstate *lzs,BYTE *b) {
 104         if (lzs->getcur<lzs->getlen) {
 105                 *b              = lzs->get[lzs->getcur++];
 106                 return          1;
 107         } else {
 108                 int ret = _lread(lzs->realfd,lzs->get,GETLEN);
 109                 if (ret==HFILE_ERROR)
 110                         return HFILE_ERROR;
 111                 if (ret==0)
 112                         return 0;
 113                 lzs->getlen     = ret;
 114                 lzs->getcur     = 1;
 115                 *b              = *(lzs->get);
 116                 return 1;
 117         }
 118 }
 119 /* internal function, reads lzheader
 120  * returns BADINHANDLE for non filedescriptors
 121  * return 0 for file not compressed using LZ
 122  * return UNKNOWNALG for unknown algorithm
 123  * returns lzfileheader in *head
 124  */
 125 static INT read_header(HFILE fd,struct lzfileheader *head)
 126 {
 127         BYTE    buf[14];
 128
 129         if (_llseek(fd,0,SEEK_SET)==-1)
 130                 return LZERROR_BADINHANDLE;
 131
 132         /* We can't directly read the lzfileheader struct due to
 133          * structure element alignment
 134          */
 135         if (_lread(fd,buf,14)<14)
 136                 return 0;
 137         memcpy(head->magic,buf,8);
 138         memcpy(&(head->compressiontype),buf+8,1);
 139         memcpy(&(head->lastchar),buf+9,1);
 140
 141         /* FIXME: consider endianess on non-intel architectures */
 142         memcpy(&(head->reallength),buf+10,4);
 143
 144         if (memcmp(head->magic,LZMagic,8))
 145                 return 0;
 146         if (head->compressiontype!='A')
 147                 return LZERROR_UNKNOWNALG;
 148         return 1;
 149 }
 150
 151
 152 /***********************************************************************
 153  *           LZStart   (LZ32.@)
 154  */
 155 INT WINAPI LZStart(void)
 156 {
 157     TRACE("(void)\n");
 158     return 1;
 159 }
 160
 161
 162 /***********************************************************************
 163  *           LZInit   (LZ32.@)
 164  *
 165  * initializes internal decompression buffers, returns lzfiledescriptor.
 166  * (return value the same as hfSrc, if hfSrc is not compressed)
 167  * on failure, returns error code <0
 168  * lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
 169  *
 170  * since _llseek uses the same types as libc.lseek, we just use the macros of
 171  *  libc
 172  */
 173 HFILE WINAPI LZInit( HFILE hfSrc )
 174 {
 175
 176         struct  lzfileheader    head;
 177         struct  lzstate         *lzs;
 178         DWORD   ret;
 179         int i;
 180
 181         TRACE("(%d)\n",hfSrc);
 182         ret=read_header(hfSrc,&head);
 183         if (ret<=0) {
 184                 _llseek(hfSrc,0,SEEK_SET);
 185                 return ret?ret:hfSrc;
 186         }
 187         for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
 188         if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
 189         lzstates[i] = lzs = HeapAlloc( GetProcessHeap(), 0, sizeof(struct lzstate) );
 190         if(lzs == NULL) return LZERROR_GLOBALLOC;
 191
 192         memset(lzs,'\0',sizeof(*lzs));
 193         lzs->realfd     = hfSrc;
 194         lzs->lastchar   = head.lastchar;
 195         lzs->reallength = head.reallength;
 196
 197         lzs->get        = HeapAlloc( GetProcessHeap(), 0, GETLEN );
 198         lzs->getlen     = 0;
 199         lzs->getcur     = 0;
 200
 201         if(lzs->get == NULL) {
 202                 HeapFree(GetProcessHeap(), 0, lzs);
 203                 lzstates[i] = NULL;
 204                 return LZERROR_GLOBALLOC;
 205         }
 206
 207         /* Yes, preinitialize with spaces */
 208         memset(lzs->table,' ',0x1000);
 209         /* Yes, start 16 byte from the END of the table */
 210         lzs->curtabent  = 0xff0;
 211         return 0x400 + i;
 212 }
 213
 214
 215 /***********************************************************************
 216  *           LZDone   (LZEXPAND.9)
 217  *           LZDone   (LZ32.@)
 218  */
 219 void WINAPI LZDone(void)
 220 {
 221     TRACE("(void)\n");
 222 }
 223
 224
 225 /***********************************************************************
 226  *           GetExpandedNameA   (LZ32.@)
 227  *
 228  * gets the full filename of the compressed file 'in' by opening it
 229  * and reading the header
 230  *
 231  * "file." is being translated to "file"
 232  * "file.bl_" (with lastchar 'a') is being translated to "file.bla"
 233  * "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
 234  */
 235
 236 INT WINAPI GetExpandedNameA( LPSTR in, LPSTR out )
 237 {
 238         struct lzfileheader     head;
 239         HFILE           fd;
 240         OFSTRUCT        ofs;
 241         INT             fnislowercased,ret,len;
 242         LPSTR           s,t;
 243
 244         TRACE("(%s)\n",in);
 245         fd=OpenFile(in,&ofs,OF_READ);
 246         if (fd==HFILE_ERROR)
 247                 return (INT)(INT16)LZERROR_BADINHANDLE;
 248         strcpy(out,in);
 249         ret=read_header(fd,&head);
 250         if (ret<=0) {
 251                 /* not a LZ compressed file, so the expanded name is the same
 252                  * as the input name */
 253                 _lclose(fd);
 254                 return 1;
 255         }
 256
 257
 258         /* look for directory prefix and skip it. */
 259         s=out;
 260         while (NULL!=(t=strpbrk(s,"/\\:")))
 261                 s=t+1;
 262
 263         /* now mangle the basename */
 264         if (!*s) {
 265                 /* FIXME: hmm. shouldn't happen? */
 266                 WARN("Specified a directory or what? (%s)\n",in);
 267                 _lclose(fd);
 268                 return 1;
 269         }
 270         /* see if we should use lowercase or uppercase on the last char */
 271         fnislowercased=1;
 272         t=s+strlen(s)-1;
 273         while (t>=out) {
 274                 if (!isalpha(*t)) {
 275                         t--;
 276                         continue;
 277                 }
 278                 fnislowercased=islower(*t);
 279                 break;
 280         }
 281         if (isalpha(head.lastchar)) {
 282                 if (fnislowercased)
 283                         head.lastchar=tolower(head.lastchar);
 284                 else
 285                         head.lastchar=toupper(head.lastchar);
 286         }
 287
 288         /* now look where to replace the last character */
 289         if (NULL!=(t=strchr(s,'.'))) {
 290                 if (t[1]=='\0') {
 291                         t[0]='\0';
 292                 } else {
 293                         len=strlen(t)-1;
 294                         if (t[len]=='_')
 295                                 t[len]=head.lastchar;
 296                 }
 297         } /* else no modification necessary */
 298         _lclose(fd);
 299         return 1;
 300 }
 301
 302
 303 /***********************************************************************
 304  *           GetExpandedNameW   (LZ32.@)
 305  */
 306 INT WINAPI GetExpandedNameW( LPWSTR in, LPWSTR out )
 307 {
 308     INT ret;
 309     DWORD len = WideCharToMultiByte( CP_ACP, 0, in, -1, NULL, 0, NULL, NULL );
 310     char *xin = HeapAlloc( GetProcessHeap(), 0, len );
 311     char *xout = HeapAlloc( GetProcessHeap(), 0, len+3 );
 312     WideCharToMultiByte( CP_ACP, 0, in, -1, xin, len, NULL, NULL );
 313     if ((ret = GetExpandedNameA( xin, xout )) > 0)
 314         MultiByteToWideChar( CP_ACP, 0, xout, -1, out, strlenW(in)+4 );
 315     HeapFree( GetProcessHeap(), 0, xin );
 316     HeapFree( GetProcessHeap(), 0, xout );
 317     return ret;
 318 }
 319
 320
 321 /***********************************************************************
 322  *           LZRead   (LZ32.@)
 323  */
 324 INT WINAPI LZRead( HFILE fd, LPSTR vbuf, INT toread )
 325 {
 326         int     howmuch;
 327         BYTE    b,*buf;
 328         struct  lzstate *lzs;
 329
 330         buf=(LPBYTE)vbuf;
 331         TRACE("(%d,%p,%d)\n",fd,buf,toread);
 332         howmuch=toread;
 333         if (!(lzs = GET_LZ_STATE(fd))) return _lread(fd,buf,toread);
 334
 335 /* The decompressor itself is in a define, cause we need it twice
 336  * in this function. (the decompressed byte will be in b)
 337  */
 338 #define DECOMPRESS_ONE_BYTE                                             \
 339                 if (lzs->stringlen) {                                   \
 340                         b               = lzs->table[lzs->stringpos];   \
 341                         lzs->stringpos  = (lzs->stringpos+1)&0xFFF;     \
 342                         lzs->stringlen--;                               \
 343                 } else {                                                \
 344                         if (!(lzs->bytetype&0x100)) {                   \
 345                                 if (1!=GET(lzs,b))                      \
 346                                         return toread-howmuch;          \
 347                                 lzs->bytetype = b|0xFF00;               \
 348                         }                                               \
 349                         if (lzs->bytetype & 1) {                        \
 350                                 if (1!=GET(lzs,b))                      \
 351                                         return toread-howmuch;          \
 352                         } else {                                        \
 353                                 BYTE    b1,b2;                          \
 354                                                                         \
 355                                 if (1!=GET(lzs,b1))                     \
 356                                         return toread-howmuch;          \
 357                                 if (1!=GET(lzs,b2))                     \
 358                                         return toread-howmuch;          \
 359                                 /* Format:                              \
 360                                  * b1 b2                                \
 361                                  * AB CD                                \
 362                                  * where CAB is the stringoffset in the table\
 363                                  * and D+3 is the len of the string     \
 364                                  */                                     \
 365                                 lzs->stringpos  = b1|((b2&0xf0)<<4);    \
 366                                 lzs->stringlen  = (b2&0xf)+2;           \
 367                                 /* 3, but we use a  byte already below ... */\
 368                                 b               = lzs->table[lzs->stringpos];\
 369                                 lzs->stringpos  = (lzs->stringpos+1)&0xFFF;\
 370                         }                                               \
 371                         lzs->bytetype>>=1;                              \
 372                 }                                                       \
 373                 /* store b in table */                                  \
 374                 lzs->table[lzs->curtabent++]= b;                        \
 375                 lzs->curtabent  &= 0xFFF;                               \
 376                 lzs->realcurrent++;
 377
 378         /* if someone has seeked, we have to bring the decompressor
 379          * to that position
 380          */
 381         if (lzs->realcurrent!=lzs->realwanted) {
 382                 /* if the wanted position is before the current position
 383                  * I see no easy way to unroll ... We have to restart at
 384                  * the beginning. *sigh*
 385                  */
 386                 if (lzs->realcurrent>lzs->realwanted) {
 387                         /* flush decompressor state */
 388                         _llseek(lzs->realfd,14,SEEK_SET);
 389                         GET_FLUSH(lzs);
 390                         lzs->realcurrent= 0;
 391                         lzs->bytetype   = 0;
 392                         lzs->stringlen  = 0;
 393                         memset(lzs->table,' ',0x1000);
 394                         lzs->curtabent  = 0xFF0;
 395                 }
 396                 while (lzs->realcurrent<lzs->realwanted) {
 397                         DECOMPRESS_ONE_BYTE;
 398                 }
 399         }
 400
 401         while (howmuch) {
 402                 DECOMPRESS_ONE_BYTE;
 403                 lzs->realwanted++;
 404                 *buf++          = b;
 405                 howmuch--;
 406         }
 407         return  toread;
 408 #undef DECOMPRESS_ONE_BYTE
 409 }
 410
 411
 412 /***********************************************************************
 413  *           LZSeek   (LZ32.@)
 414  */
 415 LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
 416 {
 417         struct  lzstate *lzs;
 418         LONG    newwanted;
 419
 420         TRACE("(%d,%ld,%d)\n",fd,off,type);
 421         /* not compressed? just use normal _llseek() */
 422         if (!(lzs = GET_LZ_STATE(fd))) return _llseek(fd,off,type);
 423         newwanted = lzs->realwanted;
 424         switch (type) {
 425         case 1: /* SEEK_CUR */
 426                 newwanted      += off;
 427                 break;
 428         case 2: /* SEEK_END */
 429                 newwanted       = lzs->reallength-off;
 430                 break;
 431         default:/* SEEK_SET */
 432                 newwanted       = off;
 433                 break;
 434         }
 435         if (newwanted>lzs->reallength)
 436                 return LZERROR_BADVALUE;
 437         if (newwanted<0)
 438                 return LZERROR_BADVALUE;
 439         lzs->realwanted = newwanted;
 440         return newwanted;
 441 }
 442
 443
 444 /***********************************************************************
 445  *           LZCopy   (LZ32.@)
 446  *
 447  * Copies everything from src to dest
 448  * if src is a LZ compressed file, it will be uncompressed.
 449  * will return the number of bytes written to dest or errors.
 450  */
 451 LONG WINAPI LZCopy( HFILE src, HFILE dest )
 452 {
 453         int     usedlzinit = 0, ret, wret;
 454         LONG    len;
 455         HFILE   oldsrc = src, srcfd;
 456         FILETIME filetime;
 457         struct  lzstate *lzs;
 458 #define BUFLEN  1000
 459         BYTE    buf[BUFLEN];
 460         /* we need that weird typedef, for i can't seem to get function pointer
 461          * casts right. (Or they probably just do not like WINAPI in general)
 462          */
 463         typedef UINT    (WINAPI *_readfun)(HFILE,LPVOID,UINT);
 464
 465         _readfun        xread;
 466
 467         TRACE("(%d,%d)\n",src,dest);
 468         if (!IS_LZ_HANDLE(src)) {
 469                 src = LZInit(src);
 470                 if ((INT)src <= 0) return 0;
 471                 if (src != oldsrc) usedlzinit=1;
 472         }
 473
 474         /* not compressed? just copy */
 475         if (!IS_LZ_HANDLE(src))
 476                 xread=_lread;
 477         else
 478                 xread=(_readfun)LZRead;
 479         len=0;
 480         while (1) {
 481                 ret=xread(src,buf,BUFLEN);
 482                 if (ret<=0) {
 483                         if (ret==0)
 484                                 break;
 485                         if (ret==-1)
 486                                 return LZERROR_READ;
 487                         return ret;
 488                 }
 489                 len    += ret;
 490                 wret    = _lwrite(dest,buf,ret);
 491                 if (wret!=ret)
 492                         return LZERROR_WRITE;
 493         }
 494
 495         /* Maintain the timestamp of source file to destination file */
 496         srcfd = (!(lzs = GET_LZ_STATE(src))) ? src : lzs->realfd;
 497         GetFileTime((HANDLE)srcfd, NULL, NULL, &filetime);
 498         SetFileTime((HANDLE)dest, NULL, NULL, &filetime);
 499
 500         /* close handle */
 501         if (usedlzinit)
 502                 LZClose(src);
 503         return len;
 504 #undef BUFLEN
 505 }
 506
 507 /* reverses GetExpandedPathname */
 508 static LPSTR LZEXPAND_MangleName( LPCSTR fn )
 509 {
 510     char *p;
 511     char *mfn = HeapAlloc( GetProcessHeap(), 0, strlen(fn) + 3 ); /* "._" and \0 */
 512     if(mfn == NULL) return NULL;
 513     strcpy( mfn, fn );
 514     if (!(p = strrchr( mfn, '\\' ))) p = mfn;
 515     if ((p = strchr( p, '.' )))
 516     {
 517         p++;
 518         if (strlen(p) < 3) strcat( p, "_" );  /* append '_' */
 519         else p[strlen(p)-1] = '_';  /* replace last character */
 520     }
 521     else strcat( mfn, "._" );   /* append "._" */
 522     return mfn;
 523 }
 524
 525
 526 /***********************************************************************
 527  *           LZOpenFileA   (LZ32.@)
 528  *
 529  * Opens a file. If not compressed, open it as a normal file.
 530  */
 531 HFILE WINAPI LZOpenFileA( LPSTR fn, LPOFSTRUCT ofs, WORD mode )
 532 {
 533         HFILE   fd,cfd;
 534
 535         TRACE("(%s,%p,%d)\n",fn,ofs,mode);
 536         /* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
 537         fd=OpenFile(fn,ofs,mode);
 538         if (fd==HFILE_ERROR)
 539         {
 540             LPSTR mfn = LZEXPAND_MangleName(fn);
 541             fd = OpenFile(mfn,ofs,mode);
 542             HeapFree( GetProcessHeap(), 0, mfn );
 543         }
 544         if ((mode&~0x70)!=OF_READ)
 545                 return fd;
 546         if (fd==HFILE_ERROR)
 547                 return HFILE_ERROR;
 548         cfd=LZInit(fd);
 549         if ((INT)cfd <= 0) return fd;
 550         return cfd;
 551 }
 552
 553
 554 /***********************************************************************
 555  *           LZOpenFileW   (LZ32.@)
 556  */
 557 HFILE WINAPI LZOpenFileW( LPWSTR fn, LPOFSTRUCT ofs, WORD mode )
 558 {
 559     HFILE ret;
 560     DWORD len = WideCharToMultiByte( CP_ACP, 0, fn, -1, NULL, 0, NULL, NULL );
 561     LPSTR xfn = HeapAlloc( GetProcessHeap(), 0, len );
 562     WideCharToMultiByte( CP_ACP, 0, fn, -1, xfn, len, NULL, NULL );
 563     ret = LZOpenFileA(xfn,ofs,mode);
 564     HeapFree( GetProcessHeap(), 0, xfn );
 565     return ret;
 566 }
 567
 568
 569 /***********************************************************************
 570  *           LZClose   (LZ32.@)
 571  */
 572 void WINAPI LZClose( HFILE fd )
 573 {
 574         struct lzstate *lzs;
 575
 576         TRACE("(%d)\n",fd);
 577         if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
 578         else
 579         {
 580             HeapFree( GetProcessHeap(), 0, lzs->get );
 581             CloseHandle((HANDLE)lzs->realfd);
 582             lzstates[fd - 0x400] = NULL;
 583             HeapFree( GetProcessHeap(), 0, lzs );
 584         }
 585 }
 586
 587
 588 /***********************************************************************
 589  *           CopyLZFile  (LZ32.@)
 590  *
 591  * Copy src to dest (including uncompressing src).
 592  * NOTE: Yes. This is exactly the same function as LZCopy.
 593  */
 594 LONG WINAPI CopyLZFile( HFILE src, HFILE dest )
 595 {
 596     TRACE("(%d,%d)\n",src,dest);
 597     return LZCopy(src,dest);
 598 }