dlls/kernel32/lzexpand.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 #define LZ_MAGIC_LEN    8
  62 #define LZ_HEADER_LEN   14
  63
  64 /* Format of first 14 byte of LZ compressed file */
  65 struct lzfileheader {
  66         BYTE    magic[LZ_MAGIC_LEN];
  67         BYTE    compressiontype;
  68         CHAR    lastchar;
  69         DWORD   reallength;
  70 };
  71 static const BYTE LZMagic[LZ_MAGIC_LEN]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
  72
  73 #define LZ_TABLE_SIZE    0x1000
  74
  75 struct lzstate {
  76         HFILE   realfd;         /* the real filedescriptor */
  77         CHAR    lastchar;       /* the last char of the filename */
  78
  79         DWORD   reallength;     /* the decompressed length of the file */
  80         DWORD   realcurrent;    /* the position the decompressor currently is */
  81         DWORD   realwanted;     /* the position the user wants to read from */
  82
  83         BYTE    table[LZ_TABLE_SIZE];   /* the rotating LZ table */
  84         UINT    curtabent;      /* CURrent TABle ENTry */
  85
  86         BYTE    stringlen;      /* length and position of current string */
  87         DWORD   stringpos;      /* from stringtable */
  88
  89
  90         WORD    bytetype;       /* bitmask within blocks */
  91
  92         BYTE    *get;           /* GETLEN bytes */
  93         DWORD   getcur;         /* current read */
  94         DWORD   getlen;         /* length last got */
  95 };
  96
  97 #define MAX_LZSTATES 16
  98 static struct lzstate *lzstates[MAX_LZSTATES];
  99
 100 #define LZ_MIN_HANDLE  0x400
 101 #define IS_LZ_HANDLE(h) (((h) >= LZ_MIN_HANDLE) && ((h) < LZ_MIN_HANDLE+MAX_LZSTATES))
 102 #define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-LZ_MIN_HANDLE] : NULL)
 103
 104 /* reads one compressed byte, including buffering */
 105 #define GET(lzs,b)      _lzget(lzs,&b)
 106 #define GET_FLUSH(lzs)  lzs->getcur=lzs->getlen;
 107
 108 static int
 109 _lzget(struct lzstate *lzs,BYTE *b) {
 110         if (lzs->getcur<lzs->getlen) {
 111                 *b              = lzs->get[lzs->getcur++];
 112                 return          1;
 113         } else {
 114                 int ret = _lread(lzs->realfd,lzs->get,GETLEN);
 115                 if (ret==HFILE_ERROR)
 116                         return HFILE_ERROR;
 117                 if (ret==0)
 118                         return 0;
 119                 lzs->getlen     = ret;
 120                 lzs->getcur     = 1;
 121                 *b              = *(lzs->get);
 122                 return 1;
 123         }
 124 }
 125 /* internal function, reads lzheader
 126  * returns BADINHANDLE for non filedescriptors
 127  * return 0 for file not compressed using LZ
 128  * return UNKNOWNALG for unknown algorithm
 129  * returns lzfileheader in *head
 130  */
 131 static INT read_header(HFILE fd,struct lzfileheader *head)
 132 {
 133         BYTE    buf[LZ_HEADER_LEN];
 134
 135         if (_llseek(fd,0,SEEK_SET)==-1)
 136                 return LZERROR_BADINHANDLE;
 137
 138         /* We can't directly read the lzfileheader struct due to
 139          * structure element alignment
 140          */
 141         if (_lread(fd,buf,LZ_HEADER_LEN)<LZ_HEADER_LEN)
 142                 return 0;
 143         memcpy(head->magic,buf,LZ_MAGIC_LEN);
 144         memcpy(&(head->compressiontype),buf+LZ_MAGIC_LEN,1);
 145         memcpy(&(head->lastchar),buf+LZ_MAGIC_LEN+1,1);
 146
 147         /* FIXME: consider endianness on non-intel architectures */
 148         memcpy(&(head->reallength),buf+LZ_MAGIC_LEN+2,4);
 149
 150         if (memcmp(head->magic,LZMagic,LZ_MAGIC_LEN))
 151                 return 0;
 152         if (head->compressiontype!='A')
 153                 return LZERROR_UNKNOWNALG;
 154         return 1;
 155 }
 156
 157
 158 /***********************************************************************
 159  *           LZStart   (KERNEL32.@)
 160  */
 161 INT WINAPI LZStart(void)
 162 {
 163     TRACE("(void)\n");
 164     return 1;
 165 }
 166
 167
 168 /***********************************************************************
 169  *           LZInit   (KERNEL32.@)
 170  *
 171  * initializes internal decompression buffers, returns lzfiledescriptor.
 172  * (return value the same as hfSrc, if hfSrc is not compressed)
 173  * on failure, returns error code <0
 174  * lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
 175  *
 176  * since _llseek uses the same types as libc.lseek, we just use the macros of
 177  *  libc
 178  */
 179 HFILE WINAPI LZInit( HFILE hfSrc )
 180 {
 181
 182         struct  lzfileheader    head;
 183         struct  lzstate         *lzs;
 184         int     i, ret;
 185
 186         TRACE("(%d)\n",hfSrc);
 187         ret=read_header(hfSrc,&head);
 188         if (ret<=0) {
 189                 _llseek(hfSrc,0,SEEK_SET);
 190                 return ret?ret:hfSrc;
 191         }
 192         for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
 193         if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
 194         lzstates[i] = lzs = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*lzs) );
 195         if(lzs == NULL) return LZERROR_GLOBALLOC;
 196
 197         lzs->realfd     = hfSrc;
 198         lzs->lastchar   = head.lastchar;
 199         lzs->reallength = head.reallength;
 200
 201         lzs->get        = HeapAlloc( GetProcessHeap(), 0, GETLEN );
 202         lzs->getlen     = 0;
 203         lzs->getcur     = 0;
 204
 205         if(lzs->get == NULL) {
 206                 HeapFree(GetProcessHeap(), 0, lzs);
 207                 lzstates[i] = NULL;
 208                 return LZERROR_GLOBALLOC;
 209         }
 210
 211         /* Yes, preinitialize with spaces */
 212         memset(lzs->table,' ',LZ_TABLE_SIZE);
 213         /* Yes, start 16 byte from the END of the table */
 214         lzs->curtabent  = 0xff0;
 215         return LZ_MIN_HANDLE + i;
 216 }
 217
 218
 219 /***********************************************************************
 220  *           LZDone   (KERNEL32.@)
 221  */
 222 void WINAPI LZDone(void)
 223 {
 224     TRACE("(void)\n");
 225 }
 226
 227
 228 /***********************************************************************
 229  *           GetExpandedNameA   (KERNEL32.@)
 230  *
 231  * gets the full filename of the compressed file 'in' by opening it
 232  * and reading the header
 233  *
 234  * "file." is being translated to "file"
 235  * "file.bl_" (with lastchar 'a') is being translated to "file.bla"
 236  * "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
 237  */
 238
 239 INT WINAPI GetExpandedNameA( LPSTR in, LPSTR out )
 240 {
 241         struct lzfileheader     head;
 242         HFILE           fd;
 243         OFSTRUCT        ofs;
 244         INT             fnislowercased,ret,len;
 245         LPSTR           s,t;
 246
 247         TRACE("(%s)\n",in);
 248         fd=OpenFile(in,&ofs,OF_READ);
 249         if (fd==HFILE_ERROR)
 250                 return (INT)(INT16)LZERROR_BADINHANDLE;
 251         strcpy(out,in);
 252         ret=read_header(fd,&head);
 253         if (ret<=0) {
 254                 /* not a LZ compressed file, so the expanded name is the same
 255                  * as the input name */
 256                 _lclose(fd);
 257                 return 1;
 258         }
 259
 260
 261         /* look for directory prefix and skip it. */
 262         s=out;
 263         while (NULL!=(t=strpbrk(s,"/\\:")))
 264                 s=t+1;
 265
 266         /* now mangle the basename */
 267         if (!*s) {
 268                 /* FIXME: hmm. shouldn't happen? */
 269                 WARN("Specified a directory or what? (%s)\n",in);
 270                 _lclose(fd);
 271                 return 1;
 272         }
 273         /* see if we should use lowercase or uppercase on the last char */
 274         fnislowercased=1;
 275         t=s+strlen(s)-1;
 276         while (t>=out) {
 277                 if (!isalpha(*t)) {
 278                         t--;
 279                         continue;
 280                 }
 281                 fnislowercased=islower(*t);
 282                 break;
 283         }
 284         if (isalpha(head.lastchar)) {
 285                 if (fnislowercased)
 286                         head.lastchar=tolower(head.lastchar);
 287                 else
 288                         head.lastchar=toupper(head.lastchar);
 289         }
 290
 291         /* now look where to replace the last character */
 292         if (NULL!=(t=strchr(s,'.'))) {
 293                 if (t[1]=='\0') {
 294                         t[0]='\0';
 295                 } else {
 296                         len=strlen(t)-1;
 297                         if (t[len]=='_')
 298                                 t[len]=head.lastchar;
 299                 }
 300         } /* else no modification necessary */
 301         _lclose(fd);
 302         return 1;
 303 }
 304
 305
 306 /***********************************************************************
 307  *           GetExpandedNameW   (KERNEL32.@)
 308  */
 309 INT WINAPI GetExpandedNameW( LPWSTR in, LPWSTR out )
 310 {
 311     INT ret;
 312     DWORD len = WideCharToMultiByte( CP_ACP, 0, in, -1, NULL, 0, NULL, NULL );
 313     char *xin = HeapAlloc( GetProcessHeap(), 0, len );
 314     char *xout = HeapAlloc( GetProcessHeap(), 0, len+3 );
 315     WideCharToMultiByte( CP_ACP, 0, in, -1, xin, len, NULL, NULL );
 316     if ((ret = GetExpandedNameA( xin, xout )) > 0)
 317         MultiByteToWideChar( CP_ACP, 0, xout, -1, out, strlenW(in)+4 );
 318     HeapFree( GetProcessHeap(), 0, xin );
 319     HeapFree( GetProcessHeap(), 0, xout );
 320     return ret;
 321 }
 322
 323
 324 /***********************************************************************
 325  *           LZRead   (KERNEL32.@)
 326  */
 327 INT WINAPI LZRead( HFILE fd, LPSTR vbuf, INT toread )
 328 {
 329         int     howmuch;
 330         BYTE    b,*buf;
 331         struct  lzstate *lzs;
 332
 333         buf=(LPBYTE)vbuf;
 334         TRACE("(%d,%p,%d)\n",fd,buf,toread);
 335         howmuch=toread;
 336         if (!(lzs = GET_LZ_STATE(fd))) return _lread(fd,buf,toread);
 337
 338 /* The decompressor itself is in a define, cause we need it twice
 339  * in this function. (the decompressed byte will be in b)
 340  */
 341 #define DECOMPRESS_ONE_BYTE                                             \
 342                 if (lzs->stringlen) {                                   \
 343                         b               = lzs->table[lzs->stringpos];   \
 344                         lzs->stringpos  = (lzs->stringpos+1)&0xFFF;     \
 345                         lzs->stringlen--;                               \
 346                 } else {                                                \
 347                         if (!(lzs->bytetype&0x100)) {                   \
 348                                 if (1!=GET(lzs,b))                      \
 349                                         return toread-howmuch;          \
 350                                 lzs->bytetype = b|0xFF00;               \
 351                         }                                               \
 352                         if (lzs->bytetype & 1) {                        \
 353                                 if (1!=GET(lzs,b))                      \
 354                                         return toread-howmuch;          \
 355                         } else {                                        \
 356                                 BYTE    b1,b2;                          \
 357                                                                         \
 358                                 if (1!=GET(lzs,b1))                     \
 359                                         return toread-howmuch;          \
 360                                 if (1!=GET(lzs,b2))                     \
 361                                         return toread-howmuch;          \
 362                                 /* Format:                              \
 363                                  * b1 b2                                \
 364                                  * AB CD                                \
 365                                  * where CAB is the stringoffset in the table\
 366                                  * and D+3 is the len of the string     \
 367                                  */                                     \
 368                                 lzs->stringpos  = b1|((b2&0xf0)<<4);    \
 369                                 lzs->stringlen  = (b2&0xf)+2;           \
 370                                 /* 3, but we use a  byte already below ... */\
 371                                 b               = lzs->table[lzs->stringpos];\
 372                                 lzs->stringpos  = (lzs->stringpos+1)&0xFFF;\
 373                         }                                               \
 374                         lzs->bytetype>>=1;                              \
 375                 }                                                       \
 376                 /* store b in table */                                  \
 377                 lzs->table[lzs->curtabent++]= b;                        \
 378                 lzs->curtabent  &= 0xFFF;                               \
 379                 lzs->realcurrent++;
 380
 381         /* if someone has seeked, we have to bring the decompressor
 382          * to that position
 383          */
 384         if (lzs->realcurrent!=lzs->realwanted) {
 385                 /* if the wanted position is before the current position
 386                  * I see no easy way to unroll ... We have to restart at
 387                  * the beginning. *sigh*
 388                  */
 389                 if (lzs->realcurrent>lzs->realwanted) {
 390                         /* flush decompressor state */
 391                         _llseek(lzs->realfd,LZ_HEADER_LEN,SEEK_SET);
 392                         GET_FLUSH(lzs);
 393                         lzs->realcurrent= 0;
 394                         lzs->bytetype   = 0;
 395                         lzs->stringlen  = 0;
 396                         memset(lzs->table,' ',LZ_TABLE_SIZE);
 397                         lzs->curtabent  = 0xFF0;
 398                 }
 399                 while (lzs->realcurrent<lzs->realwanted) {
 400                         DECOMPRESS_ONE_BYTE;
 401                 }
 402         }
 403
 404         while (howmuch) {
 405                 DECOMPRESS_ONE_BYTE;
 406                 lzs->realwanted++;
 407                 *buf++          = b;
 408                 howmuch--;
 409         }
 410         return  toread;
 411 #undef DECOMPRESS_ONE_BYTE
 412 }
 413
 414
 415 /***********************************************************************
 416  *           LZSeek   (KERNEL32.@)
 417  */
 418 LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
 419 {
 420         struct  lzstate *lzs;
 421         LONG    newwanted;
 422
 423         TRACE("(%d,%d,%d)\n",fd,off,type);
 424         /* not compressed? just use normal _llseek() */
 425         if (!(lzs = GET_LZ_STATE(fd))) return _llseek(fd,off,type);
 426         newwanted = lzs->realwanted;
 427         switch (type) {
 428         case 1: /* SEEK_CUR */
 429                 newwanted      += off;
 430                 break;
 431         case 2: /* SEEK_END */
 432                 newwanted       = lzs->reallength-off;
 433                 break;
 434         default:/* SEEK_SET */
 435                 newwanted       = off;
 436                 break;
 437         }
 438         if (newwanted>lzs->reallength)
 439                 return LZERROR_BADVALUE;
 440         if (newwanted<0)
 441                 return LZERROR_BADVALUE;
 442         lzs->realwanted = newwanted;
 443         return newwanted;
 444 }
 445
 446
 447 /***********************************************************************
 448  *           LZCopy   (KERNEL32.@)
 449  *
 450  * Copies everything from src to dest
 451  * if src is a LZ compressed file, it will be uncompressed.
 452  * will return the number of bytes written to dest or errors.
 453  */
 454 LONG WINAPI LZCopy( HFILE src, HFILE dest )
 455 {
 456         int     usedlzinit = 0, ret, wret;
 457         LONG    len;
 458         HFILE   oldsrc = src, srcfd;
 459         FILETIME filetime;
 460         struct  lzstate *lzs;
 461 #define BUFLEN  1000
 462         CHAR    buf[BUFLEN];
 463         /* we need that weird typedef, for i can't seem to get function pointer
 464          * casts right. (Or they probably just do not like WINAPI in general)
 465          */
 466         typedef UINT    (WINAPI *_readfun)(HFILE,LPVOID,UINT);
 467
 468         _readfun        xread;
 469
 470         TRACE("(%d,%d)\n",src,dest);
 471         if (!IS_LZ_HANDLE(src)) {
 472                 src = LZInit(src);
 473                 if ((INT)src <= 0) return 0;
 474                 if (src != oldsrc) usedlzinit=1;
 475         }
 476
 477         /* not compressed? just copy */
 478         if (!IS_LZ_HANDLE(src))
 479                 xread=_lread;
 480         else
 481                 xread=(_readfun)LZRead;
 482         len=0;
 483         while (1) {
 484                 ret=xread(src,buf,BUFLEN);
 485                 if (ret<=0) {
 486                         if (ret==0)
 487                                 break;
 488                         if (ret==-1)
 489                                 return LZERROR_READ;
 490                         return ret;
 491                 }
 492                 len    += ret;
 493                 wret    = _lwrite(dest,buf,ret);
 494                 if (wret!=ret)
 495                         return LZERROR_WRITE;
 496         }
 497
 498         /* Maintain the timestamp of source file to destination file */
 499         srcfd = (!(lzs = GET_LZ_STATE(src))) ? src : lzs->realfd;
 500         GetFileTime( LongToHandle(srcfd), NULL, NULL, &filetime );
 501         SetFileTime( LongToHandle(dest), NULL, NULL, &filetime );
 502
 503         /* close handle */
 504         if (usedlzinit)
 505                 LZClose(src);
 506         return len;
 507 #undef BUFLEN
 508 }
 509
 510 /* reverses GetExpandedPathname */
 511 static LPSTR LZEXPAND_MangleName( LPCSTR fn )
 512 {
 513     char *p;
 514     char *mfn = HeapAlloc( GetProcessHeap(), 0, strlen(fn) + 3 ); /* "._" and \0 */
 515     if(mfn == NULL) return NULL;
 516     strcpy( mfn, fn );
 517     if (!(p = strrchr( mfn, '\\' ))) p = mfn;
 518     if ((p = strchr( p, '.' )))
 519     {
 520         p++;
 521         if (strlen(p) < 3) strcat( p, "_" );  /* append '_' */
 522         else p[strlen(p)-1] = '_';  /* replace last character */
 523     }
 524     else strcat( mfn, "._" );   /* append "._" */
 525     return mfn;
 526 }
 527
 528
 529 /***********************************************************************
 530  *           LZOpenFileA   (KERNEL32.@)
 531  *
 532  * Opens a file. If not compressed, open it as a normal file.
 533  */
 534 HFILE WINAPI LZOpenFileA( LPSTR fn, LPOFSTRUCT ofs, WORD mode )
 535 {
 536         HFILE   fd,cfd;
 537         BYTE    ofs_cBytes = ofs->cBytes;
 538
 539         TRACE("(%s,%p,%d)\n",fn,ofs,mode);
 540         /* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
 541         fd=OpenFile(fn,ofs,mode);
 542         if (fd==HFILE_ERROR)
 543         {
 544             LPSTR mfn = LZEXPAND_MangleName(fn);
 545             fd = OpenFile(mfn,ofs,mode);
 546             HeapFree( GetProcessHeap(), 0, mfn );
 547         }
 548         if (fd==HFILE_ERROR)
 549                 ofs->cBytes = ofs_cBytes;
 550         if ((mode&~0x70)!=OF_READ)
 551                 return fd;
 552         if (fd==HFILE_ERROR)
 553                 return HFILE_ERROR;
 554         cfd=LZInit(fd);
 555         if ((INT)cfd <= 0) return fd;
 556         return cfd;
 557 }
 558
 559
 560 /***********************************************************************
 561  *           LZOpenFileW   (KERNEL32.@)
 562  */
 563 HFILE WINAPI LZOpenFileW( LPWSTR fn, LPOFSTRUCT ofs, WORD mode )
 564 {
 565     HFILE ret;
 566     DWORD len = WideCharToMultiByte( CP_ACP, 0, fn, -1, NULL, 0, NULL, NULL );
 567     LPSTR xfn = HeapAlloc( GetProcessHeap(), 0, len );
 568     WideCharToMultiByte( CP_ACP, 0, fn, -1, xfn, len, NULL, NULL );
 569     ret = LZOpenFileA(xfn,ofs,mode);
 570     HeapFree( GetProcessHeap(), 0, xfn );
 571     return ret;
 572 }
 573
 574
 575 /***********************************************************************
 576  *           LZClose   (KERNEL32.@)
 577  */
 578 void WINAPI LZClose( HFILE fd )
 579 {
 580         struct lzstate *lzs;
 581
 582         TRACE("(%d)\n",fd);
 583         if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
 584         else
 585         {
 586             HeapFree( GetProcessHeap(), 0, lzs->get );
 587             CloseHandle( LongToHandle(lzs->realfd) );
 588             lzstates[fd - LZ_MIN_HANDLE] = NULL;
 589             HeapFree( GetProcessHeap(), 0, lzs );
 590         }
 591 }