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