1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589
|
/*
* LZ Decompression functions
*
* Copyright 1996 Marcus Meissner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* NOTES
*
* The LZ (Lempel Ziv) decompression was used in win16 installation programs.
* It is a simple tabledriven decompression engine, the algorithm is not
* documented as far as I know. WINE does not contain a compressor for
* this format.
*
* The implementation is complete and there have been no reports of failures
* for some time.
*
* TODO:
*
* o Check whether the return values are correct
*
*/
#include "config.h"
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "windef.h"
#include "winbase.h"
#include "lzexpand.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(file);
/* The readahead length of the decompressor. Reading single bytes
* using _lread() would be SLOW.
*/
#define GETLEN 2048
#define LZ_MAGIC_LEN 8
#define LZ_HEADER_LEN 14
/* Format of first 14 byte of LZ compressed file */
struct lzfileheader {
BYTE magic[LZ_MAGIC_LEN];
BYTE compressiontype;
CHAR lastchar;
DWORD reallength;
};
static const BYTE LZMagic[LZ_MAGIC_LEN]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
#define LZ_TABLE_SIZE 0x1000
struct lzstate {
HFILE realfd; /* the real filedescriptor */
CHAR lastchar; /* the last char of the filename */
DWORD reallength; /* the decompressed length of the file */
DWORD realcurrent; /* the position the decompressor currently is */
DWORD realwanted; /* the position the user wants to read from */
BYTE table[LZ_TABLE_SIZE]; /* the rotating LZ table */
UINT curtabent; /* CURrent TABle ENTry */
BYTE stringlen; /* length and position of current string */
DWORD stringpos; /* from stringtable */
WORD bytetype; /* bitmask within blocks */
BYTE *get; /* GETLEN bytes */
DWORD getcur; /* current read */
DWORD getlen; /* length last got */
};
#define MAX_LZSTATES 16
static struct lzstate *lzstates[MAX_LZSTATES];
#define LZ_MIN_HANDLE 0x400
#define IS_LZ_HANDLE(h) (((h) >= LZ_MIN_HANDLE) && ((h) < LZ_MIN_HANDLE+MAX_LZSTATES))
#define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-LZ_MIN_HANDLE] : NULL)
/* reads one compressed byte, including buffering */
#define GET(lzs,b) _lzget(lzs,&b)
#define GET_FLUSH(lzs) lzs->getcur=lzs->getlen;
static int
_lzget(struct lzstate *lzs,BYTE *b) {
if (lzs->getcur<lzs->getlen) {
*b = lzs->get[lzs->getcur++];
return 1;
} else {
int ret = _lread(lzs->realfd,lzs->get,GETLEN);
if (ret==HFILE_ERROR)
return HFILE_ERROR;
if (ret==0)
return 0;
lzs->getlen = ret;
lzs->getcur = 1;
*b = *(lzs->get);
return 1;
}
}
/* internal function, reads lzheader
* returns BADINHANDLE for non filedescriptors
* return 0 for file not compressed using LZ
* return UNKNOWNALG for unknown algorithm
* returns lzfileheader in *head
*/
static INT read_header(HFILE fd,struct lzfileheader *head)
{
BYTE buf[LZ_HEADER_LEN];
if (_llseek(fd,0,SEEK_SET)==-1)
return LZERROR_BADINHANDLE;
/* We can't directly read the lzfileheader struct due to
* structure element alignment
*/
if (_lread(fd,buf,LZ_HEADER_LEN)<LZ_HEADER_LEN)
return 0;
memcpy(head->magic,buf,LZ_MAGIC_LEN);
memcpy(&(head->compressiontype),buf+LZ_MAGIC_LEN,1);
memcpy(&(head->lastchar),buf+LZ_MAGIC_LEN+1,1);
/* FIXME: consider endianess on non-intel architectures */
memcpy(&(head->reallength),buf+LZ_MAGIC_LEN+2,4);
if (memcmp(head->magic,LZMagic,LZ_MAGIC_LEN))
return 0;
if (head->compressiontype!='A')
return LZERROR_UNKNOWNALG;
return 1;
}
/***********************************************************************
* LZStart (KERNEL32.@)
*/
INT WINAPI LZStart(void)
{
TRACE("(void)\n");
return 1;
}
/***********************************************************************
* LZInit (KERNEL32.@)
*
* initializes internal decompression buffers, returns lzfiledescriptor.
* (return value the same as hfSrc, if hfSrc is not compressed)
* on failure, returns error code <0
* lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
*
* since _llseek uses the same types as libc.lseek, we just use the macros of
* libc
*/
HFILE WINAPI LZInit( HFILE hfSrc )
{
struct lzfileheader head;
struct lzstate *lzs;
DWORD ret;
int i;
TRACE("(%d)\n",hfSrc);
ret=read_header(hfSrc,&head);
if (ret<=0) {
_llseek(hfSrc,0,SEEK_SET);
return ret?ret:hfSrc;
}
for (i = 0; i < MAX_LZSTATES; i++) if (!lzstates[i]) break;
if (i == MAX_LZSTATES) return LZERROR_GLOBALLOC;
lzstates[i] = lzs = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*lzs) );
if(lzs == NULL) return LZERROR_GLOBALLOC;
lzs->realfd = hfSrc;
lzs->lastchar = head.lastchar;
lzs->reallength = head.reallength;
lzs->get = HeapAlloc( GetProcessHeap(), 0, GETLEN );
lzs->getlen = 0;
lzs->getcur = 0;
if(lzs->get == NULL) {
HeapFree(GetProcessHeap(), 0, lzs);
lzstates[i] = NULL;
return LZERROR_GLOBALLOC;
}
/* Yes, preinitialize with spaces */
memset(lzs->table,' ',LZ_TABLE_SIZE);
/* Yes, start 16 byte from the END of the table */
lzs->curtabent = 0xff0;
return LZ_MIN_HANDLE + i;
}
/***********************************************************************
* LZDone (KERNEL32.@)
*/
void WINAPI LZDone(void)
{
TRACE("(void)\n");
}
/***********************************************************************
* GetExpandedNameA (KERNEL32.@)
*
* gets the full filename of the compressed file 'in' by opening it
* and reading the header
*
* "file." is being translated to "file"
* "file.bl_" (with lastchar 'a') is being translated to "file.bla"
* "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
*/
INT WINAPI GetExpandedNameA( LPSTR in, LPSTR out )
{
struct lzfileheader head;
HFILE fd;
OFSTRUCT ofs;
INT fnislowercased,ret,len;
LPSTR s,t;
TRACE("(%s)\n",in);
fd=OpenFile(in,&ofs,OF_READ);
if (fd==HFILE_ERROR)
return (INT)(INT16)LZERROR_BADINHANDLE;
strcpy(out,in);
ret=read_header(fd,&head);
if (ret<=0) {
/* not a LZ compressed file, so the expanded name is the same
* as the input name */
_lclose(fd);
return 1;
}
/* look for directory prefix and skip it. */
s=out;
while (NULL!=(t=strpbrk(s,"/\\:")))
s=t+1;
/* now mangle the basename */
if (!*s) {
/* FIXME: hmm. shouldn't happen? */
WARN("Specified a directory or what? (%s)\n",in);
_lclose(fd);
return 1;
}
/* see if we should use lowercase or uppercase on the last char */
fnislowercased=1;
t=s+strlen(s)-1;
while (t>=out) {
if (!isalpha(*t)) {
t--;
continue;
}
fnislowercased=islower(*t);
break;
}
if (isalpha(head.lastchar)) {
if (fnislowercased)
head.lastchar=tolower(head.lastchar);
else
head.lastchar=toupper(head.lastchar);
}
/* now look where to replace the last character */
if (NULL!=(t=strchr(s,'.'))) {
if (t[1]=='\0') {
t[0]='\0';
} else {
len=strlen(t)-1;
if (t[len]=='_')
t[len]=head.lastchar;
}
} /* else no modification necessary */
_lclose(fd);
return 1;
}
/***********************************************************************
* GetExpandedNameW (KERNEL32.@)
*/
INT WINAPI GetExpandedNameW( LPWSTR in, LPWSTR out )
{
INT ret;
DWORD len = WideCharToMultiByte( CP_ACP, 0, in, -1, NULL, 0, NULL, NULL );
char *xin = HeapAlloc( GetProcessHeap(), 0, len );
char *xout = HeapAlloc( GetProcessHeap(), 0, len+3 );
WideCharToMultiByte( CP_ACP, 0, in, -1, xin, len, NULL, NULL );
if ((ret = GetExpandedNameA( xin, xout )) > 0)
MultiByteToWideChar( CP_ACP, 0, xout, -1, out, strlenW(in)+4 );
HeapFree( GetProcessHeap(), 0, xin );
HeapFree( GetProcessHeap(), 0, xout );
return ret;
}
/***********************************************************************
* LZRead (KERNEL32.@)
*/
INT WINAPI LZRead( HFILE fd, LPSTR vbuf, INT toread )
{
int howmuch;
BYTE b,*buf;
struct lzstate *lzs;
buf=(LPBYTE)vbuf;
TRACE("(%d,%p,%d)\n",fd,buf,toread);
howmuch=toread;
if (!(lzs = GET_LZ_STATE(fd))) return _lread(fd,buf,toread);
/* The decompressor itself is in a define, cause we need it twice
* in this function. (the decompressed byte will be in b)
*/
#define DECOMPRESS_ONE_BYTE \
if (lzs->stringlen) { \
b = lzs->table[lzs->stringpos]; \
lzs->stringpos = (lzs->stringpos+1)&0xFFF; \
lzs->stringlen--; \
} else { \
if (!(lzs->bytetype&0x100)) { \
if (1!=GET(lzs,b)) \
return toread-howmuch; \
lzs->bytetype = b|0xFF00; \
} \
if (lzs->bytetype & 1) { \
if (1!=GET(lzs,b)) \
return toread-howmuch; \
} else { \
BYTE b1,b2; \
\
if (1!=GET(lzs,b1)) \
return toread-howmuch; \
if (1!=GET(lzs,b2)) \
return toread-howmuch; \
/* Format: \
* b1 b2 \
* AB CD \
* where CAB is the stringoffset in the table\
* and D+3 is the len of the string \
*/ \
lzs->stringpos = b1|((b2&0xf0)<<4); \
lzs->stringlen = (b2&0xf)+2; \
/* 3, but we use a byte already below ... */\
b = lzs->table[lzs->stringpos];\
lzs->stringpos = (lzs->stringpos+1)&0xFFF;\
} \
lzs->bytetype>>=1; \
} \
/* store b in table */ \
lzs->table[lzs->curtabent++]= b; \
lzs->curtabent &= 0xFFF; \
lzs->realcurrent++;
/* if someone has seeked, we have to bring the decompressor
* to that position
*/
if (lzs->realcurrent!=lzs->realwanted) {
/* if the wanted position is before the current position
* I see no easy way to unroll ... We have to restart at
* the beginning. *sigh*
*/
if (lzs->realcurrent>lzs->realwanted) {
/* flush decompressor state */
_llseek(lzs->realfd,LZ_HEADER_LEN,SEEK_SET);
GET_FLUSH(lzs);
lzs->realcurrent= 0;
lzs->bytetype = 0;
lzs->stringlen = 0;
memset(lzs->table,' ',LZ_TABLE_SIZE);
lzs->curtabent = 0xFF0;
}
while (lzs->realcurrent<lzs->realwanted) {
DECOMPRESS_ONE_BYTE;
}
}
while (howmuch) {
DECOMPRESS_ONE_BYTE;
lzs->realwanted++;
*buf++ = b;
howmuch--;
}
return toread;
#undef DECOMPRESS_ONE_BYTE
}
/***********************************************************************
* LZSeek (KERNEL32.@)
*/
LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
{
struct lzstate *lzs;
LONG newwanted;
TRACE("(%d,%d,%d)\n",fd,off,type);
/* not compressed? just use normal _llseek() */
if (!(lzs = GET_LZ_STATE(fd))) return _llseek(fd,off,type);
newwanted = lzs->realwanted;
switch (type) {
case 1: /* SEEK_CUR */
newwanted += off;
break;
case 2: /* SEEK_END */
newwanted = lzs->reallength-off;
break;
default:/* SEEK_SET */
newwanted = off;
break;
}
if (newwanted>lzs->reallength)
return LZERROR_BADVALUE;
if (newwanted<0)
return LZERROR_BADVALUE;
lzs->realwanted = newwanted;
return newwanted;
}
/***********************************************************************
* LZCopy (KERNEL32.@)
*
* Copies everything from src to dest
* if src is a LZ compressed file, it will be uncompressed.
* will return the number of bytes written to dest or errors.
*/
LONG WINAPI LZCopy( HFILE src, HFILE dest )
{
int usedlzinit = 0, ret, wret;
LONG len;
HFILE oldsrc = src, srcfd;
FILETIME filetime;
struct lzstate *lzs;
#define BUFLEN 1000
CHAR buf[BUFLEN];
/* we need that weird typedef, for i can't seem to get function pointer
* casts right. (Or they probably just do not like WINAPI in general)
*/
typedef UINT (WINAPI *_readfun)(HFILE,LPVOID,UINT);
_readfun xread;
TRACE("(%d,%d)\n",src,dest);
if (!IS_LZ_HANDLE(src)) {
src = LZInit(src);
if ((INT)src <= 0) return 0;
if (src != oldsrc) usedlzinit=1;
}
/* not compressed? just copy */
if (!IS_LZ_HANDLE(src))
xread=_lread;
else
xread=(_readfun)LZRead;
len=0;
while (1) {
ret=xread(src,buf,BUFLEN);
if (ret<=0) {
if (ret==0)
break;
if (ret==-1)
return LZERROR_READ;
return ret;
}
len += ret;
wret = _lwrite(dest,buf,ret);
if (wret!=ret)
return LZERROR_WRITE;
}
/* Maintain the timestamp of source file to destination file */
srcfd = (!(lzs = GET_LZ_STATE(src))) ? src : lzs->realfd;
GetFileTime( LongToHandle(srcfd), NULL, NULL, &filetime );
SetFileTime( LongToHandle(dest), NULL, NULL, &filetime );
/* close handle */
if (usedlzinit)
LZClose(src);
return len;
#undef BUFLEN
}
/* reverses GetExpandedPathname */
static LPSTR LZEXPAND_MangleName( LPCSTR fn )
{
char *p;
char *mfn = HeapAlloc( GetProcessHeap(), 0, strlen(fn) + 3 ); /* "._" and \0 */
if(mfn == NULL) return NULL;
strcpy( mfn, fn );
if (!(p = strrchr( mfn, '\\' ))) p = mfn;
if ((p = strchr( p, '.' )))
{
p++;
if (strlen(p) < 3) strcat( p, "_" ); /* append '_' */
else p[strlen(p)-1] = '_'; /* replace last character */
}
else strcat( mfn, "._" ); /* append "._" */
return mfn;
}
/***********************************************************************
* LZOpenFileA (KERNEL32.@)
*
* Opens a file. If not compressed, open it as a normal file.
*/
HFILE WINAPI LZOpenFileA( LPSTR fn, LPOFSTRUCT ofs, WORD mode )
{
HFILE fd,cfd;
TRACE("(%s,%p,%d)\n",fn,ofs,mode);
/* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
fd=OpenFile(fn,ofs,mode);
if (fd==HFILE_ERROR)
{
LPSTR mfn = LZEXPAND_MangleName(fn);
fd = OpenFile(mfn,ofs,mode);
HeapFree( GetProcessHeap(), 0, mfn );
}
if ((mode&~0x70)!=OF_READ)
return fd;
if (fd==HFILE_ERROR)
return HFILE_ERROR;
cfd=LZInit(fd);
if ((INT)cfd <= 0) return fd;
return cfd;
}
/***********************************************************************
* LZOpenFileW (KERNEL32.@)
*/
HFILE WINAPI LZOpenFileW( LPWSTR fn, LPOFSTRUCT ofs, WORD mode )
{
HFILE ret;
DWORD len = WideCharToMultiByte( CP_ACP, 0, fn, -1, NULL, 0, NULL, NULL );
LPSTR xfn = HeapAlloc( GetProcessHeap(), 0, len );
WideCharToMultiByte( CP_ACP, 0, fn, -1, xfn, len, NULL, NULL );
ret = LZOpenFileA(xfn,ofs,mode);
HeapFree( GetProcessHeap(), 0, xfn );
return ret;
}
/***********************************************************************
* LZClose (KERNEL32.@)
*/
void WINAPI LZClose( HFILE fd )
{
struct lzstate *lzs;
TRACE("(%d)\n",fd);
if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
else
{
HeapFree( GetProcessHeap(), 0, lzs->get );
CloseHandle( LongToHandle(lzs->realfd) );
lzstates[fd - LZ_MIN_HANDLE] = NULL;
HeapFree( GetProcessHeap(), 0, lzs );
}
}
|