2 * LZ Decompression functions
4 * Copyright 1996 Marcus Meissner
7 * FIXME: return values might be wrong
14 #include "wine/winbase16.h"
15 #include "wine/winestring.h"
22 /* The readahead length of the decompressor. Reading single bytes
23 * using _lread() would be SLOW.
27 /* Format of first 14 byte of LZ compressed file */
34 static BYTE LZMagic
[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
37 HFILE realfd
; /* the real filedescriptor */
38 CHAR lastchar
; /* the last char of the filename */
40 DWORD reallength
; /* the decompressed length of the file */
41 DWORD realcurrent
; /* the position the decompressor currently is */
42 DWORD realwanted
; /* the position the user wants to read from */
44 BYTE table
[0x1000]; /* the rotating LZ table */
45 UINT curtabent
; /* CURrent TABle ENTry */
47 BYTE stringlen
; /* length and position of current string */
48 DWORD stringpos
; /* from stringtable */
51 WORD bytetype
; /* bitmask within blocks */
53 BYTE
*get
; /* GETLEN bytes */
54 DWORD getcur
; /* current read */
55 DWORD getlen
; /* length last got */
58 #define MAX_LZSTATES 16
59 static struct lzstate
*lzstates
[MAX_LZSTATES
];
61 #define IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
62 #define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : NULL)
64 /* reads one compressed byte, including buffering */
65 #define GET(lzs,b) _lzget(lzs,&b)
66 #define GET_FLUSH(lzs) lzs->getcur=lzs->getlen;
69 _lzget(struct lzstate
*lzs
,BYTE
*b
) {
70 if (lzs
->getcur
<lzs
->getlen
) {
71 *b
= lzs
->get
[lzs
->getcur
++];
74 int ret
= _lread(lzs
->realfd
,lzs
->get
,GETLEN
);
85 /* internal function, reads lzheader
86 * returns BADINHANDLE for non filedescriptors
87 * return 0 for file not compressed using LZ
88 * return UNKNOWNALG for unknown algorithm
89 * returns lzfileheader in *head
91 static INT
read_header(HFILE fd
,struct lzfileheader
*head
)
95 if (_llseek(fd
,0,SEEK_SET
)==-1)
96 return LZERROR_BADINHANDLE
;
98 /* We can't directly read the lzfileheader struct due to
99 * structure element alignment
101 if (_lread(fd
,buf
,14)<14)
103 memcpy(head
->magic
,buf
,8);
104 memcpy(&(head
->compressiontype
),buf
+8,1);
105 memcpy(&(head
->lastchar
),buf
+9,1);
107 /* FIXME: consider endianess on non-intel architectures */
108 memcpy(&(head
->reallength
),buf
+10,4);
110 if (memcmp(head
->magic
,LZMagic
,8))
112 if (head
->compressiontype
!='A')
113 return LZERROR_UNKNOWNALG
;
117 /***********************************************************************
118 * LZStart16 (LZEXPAND.7)
120 INT16 WINAPI
LZStart16(void)
122 TRACE(file
,"(void)\n");
127 /***********************************************************************
130 INT WINAPI
LZStart(void)
132 TRACE(file
,"(void)\n");
137 /***********************************************************************
138 * LZInit16 (LZEXPAND.3)
140 HFILE16 WINAPI
LZInit16( HFILE16 hfSrc
)
142 HFILE ret
= LZInit( FILE_GetHandle(hfSrc
) );
143 if (IS_LZ_HANDLE(ret
)) return ret
;
144 if ((INT
)ret
<= 0) return ret
;
149 /***********************************************************************
152 * initializes internal decompression buffers, returns lzfiledescriptor.
153 * (return value the same as hfSrc, if hfSrc is not compressed)
154 * on failure, returns error code <0
155 * lzfiledescriptors range from 0x400 to 0x410 (only 16 open files per process)
157 * since _llseek uses the same types as libc.lseek, we just use the macros of
160 HFILE WINAPI
LZInit( HFILE hfSrc
)
163 struct lzfileheader head
;
168 TRACE(file
,"(%d)\n",hfSrc
);
169 ret
=read_header(hfSrc
,&head
);
171 _llseek(hfSrc
,0,SEEK_SET
);
172 return ret
?ret
:hfSrc
;
174 for (i
= 0; i
< MAX_LZSTATES
; i
++) if (!lzstates
[i
]) break;
175 if (i
== MAX_LZSTATES
) return LZERROR_GLOBALLOC
;
176 lzstates
[i
] = lzs
= HeapAlloc( SystemHeap
, 0, sizeof(struct lzstate
) );
178 memset(lzs
,'\0',sizeof(*lzs
));
180 lzs
->lastchar
= head
.lastchar
;
181 lzs
->reallength
= head
.reallength
;
183 lzs
->get
= HEAP_xalloc( GetProcessHeap(), 0, GETLEN
);
187 /* Yes, preinitialize with spaces */
188 memset(lzs
->table
,' ',0x1000);
189 /* Yes, start 16 byte from the END of the table */
190 lzs
->curtabent
= 0xff0;
195 /***********************************************************************
196 * LZDone (LZEXPAND.9) (LZ32.8)
198 void WINAPI
LZDone(void)
200 TRACE(file
,"(void)\n");
204 /***********************************************************************
205 * GetExpandedName16 (LZEXPAND.10)
207 INT16 WINAPI
GetExpandedName16( LPCSTR in
, LPSTR out
)
209 return (INT16
)GetExpandedNameA( in
, out
);
213 /***********************************************************************
214 * GetExpandedName32A (LZ32.9)
216 * gets the full filename of the compressed file 'in' by opening it
217 * and reading the header
219 * "file." is being translated to "file"
220 * "file.bl_" (with lastchar 'a') is being translated to "file.bla"
221 * "FILE.BL_" (with lastchar 'a') is being translated to "FILE.BLA"
224 INT WINAPI
GetExpandedNameA( LPCSTR in
, LPSTR out
)
226 struct lzfileheader head
;
229 INT fnislowercased
,ret
,len
;
232 TRACE(file
,"(%s)\n",in
);
233 fd
=OpenFile(in
,&ofs
,OF_READ
);
235 return (INT
)(INT16
)LZERROR_BADINHANDLE
;
237 ret
=read_header(fd
,&head
);
239 /* not a LZ compressed file, so the expanded name is the same
240 * as the input name */
246 /* look for directory prefix and skip it. */
248 while (NULL
!=(t
=strpbrk(s
,"/\\:")))
251 /* now mangle the basename */
253 /* FIXME: hmm. shouldn't happen? */
254 WARN(file
,"Specified a directory or what? (%s)\n",in
);
258 /* see if we should use lowercase or uppercase on the last char */
266 fnislowercased
=islower(*t
);
269 if (isalpha(head
.lastchar
)) {
271 head
.lastchar
=tolower(head
.lastchar
);
273 head
.lastchar
=toupper(head
.lastchar
);
276 /* now look where to replace the last character */
277 if (NULL
!=(t
=strchr(s
,'.'))) {
283 t
[len
]=head
.lastchar
;
285 } /* else no modification necessary */
291 /***********************************************************************
292 * GetExpandedName32W (LZ32.11)
294 INT WINAPI
GetExpandedNameW( LPCWSTR in
, LPWSTR out
)
299 xout
= HeapAlloc( GetProcessHeap(), 0, lstrlenW(in
)+3 );
300 xin
= HEAP_strdupWtoA( GetProcessHeap(), 0, in
);
301 ret
= GetExpandedName16(xin
,xout
);
302 if (ret
>0) lstrcpyAtoW(out
,xout
);
303 HeapFree( GetProcessHeap(), 0, xin
);
304 HeapFree( GetProcessHeap(), 0, xout
);
309 /***********************************************************************
310 * LZRead16 (LZEXPAND.5)
312 INT16 WINAPI
LZRead16( HFILE16 fd
, LPVOID buf
, UINT16 toread
)
314 if (IS_LZ_HANDLE(fd
)) return LZRead( fd
, buf
, toread
);
315 return _lread16( fd
, buf
, toread
);
319 /***********************************************************************
322 INT WINAPI
LZRead( HFILE fd
, LPVOID vbuf
, UINT toread
)
329 TRACE(file
,"(%d,%p,%d)\n",fd
,buf
,toread
);
331 if (!(lzs
= GET_LZ_STATE(fd
))) return _lread(fd
,buf
,toread
);
333 /* The decompressor itself is in a define, cause we need it twice
334 * in this function. (the decompressed byte will be in b)
336 #define DECOMPRESS_ONE_BYTE \
337 if (lzs->stringlen) { \
338 b = lzs->table[lzs->stringpos]; \
339 lzs->stringpos = (lzs->stringpos+1)&0xFFF; \
342 if (!(lzs->bytetype&0x100)) { \
344 return toread-howmuch; \
345 lzs->bytetype = b|0xFF00; \
347 if (lzs->bytetype & 1) { \
349 return toread-howmuch; \
353 if (1!=GET(lzs,b1)) \
354 return toread-howmuch; \
355 if (1!=GET(lzs,b2)) \
356 return toread-howmuch; \
360 * where CAB is the stringoffset in the table\
361 * and D+3 is the len of the string \
363 lzs->stringpos = b1|((b2&0xf0)<<4); \
364 lzs->stringlen = (b2&0xf)+2; \
365 /* 3, but we use a byte already below ... */\
366 b = lzs->table[lzs->stringpos];\
367 lzs->stringpos = (lzs->stringpos+1)&0xFFF;\
371 /* store b in table */ \
372 lzs->table[lzs->curtabent++]= b; \
373 lzs->curtabent &= 0xFFF; \
376 /* if someone has seeked, we have to bring the decompressor
379 if (lzs
->realcurrent
!=lzs
->realwanted
) {
380 /* if the wanted position is before the current position
381 * I see no easy way to unroll ... We have to restart at
382 * the beginning. *sigh*
384 if (lzs
->realcurrent
>lzs
->realwanted
) {
385 /* flush decompressor state */
386 _llseek(lzs
->realfd
,14,SEEK_SET
);
391 memset(lzs
->table
,' ',0x1000);
392 lzs
->curtabent
= 0xFF0;
394 while (lzs
->realcurrent
<lzs
->realwanted
) {
406 #undef DECOMPRESS_ONE_BYTE
410 /***********************************************************************
411 * LZSeek16 (LZEXPAND.4)
413 LONG WINAPI
LZSeek16( HFILE16 fd
, LONG off
, INT16 type
)
415 if (IS_LZ_HANDLE(fd
)) return LZSeek( fd
, off
, type
);
416 return _llseek16( fd
, off
, type
);
420 /***********************************************************************
423 LONG WINAPI
LZSeek( HFILE fd
, LONG off
, INT type
)
428 TRACE(file
,"(%d,%ld,%d)\n",fd
,off
,type
);
429 /* not compressed? just use normal _llseek() */
430 if (!(lzs
= GET_LZ_STATE(fd
))) return _llseek(fd
,off
,type
);
431 newwanted
= lzs
->realwanted
;
433 case 1: /* SEEK_CUR */
436 case 2: /* SEEK_END */
437 newwanted
= lzs
->reallength
-off
;
439 default:/* SEEK_SET */
443 if (newwanted
>lzs
->reallength
)
444 return LZERROR_BADVALUE
;
446 return LZERROR_BADVALUE
;
447 lzs
->realwanted
= newwanted
;
452 /***********************************************************************
453 * LZCopy16 (LZEXPAND.1)
456 LONG WINAPI
LZCopy16( HFILE16 src
, HFILE16 dest
)
458 /* already a LZ handle? */
459 if (IS_LZ_HANDLE(src
)) return LZCopy( src
, FILE_GetHandle(dest
) );
461 /* no, try to open one */
463 if ((INT16
)src
<= 0) return 0;
464 if (IS_LZ_HANDLE(src
))
466 LONG ret
= LZCopy( src
, FILE_GetHandle(dest
) );
470 /* it was not a compressed file */
471 return LZCopy( FILE_GetHandle(src
), FILE_GetHandle(dest
) );
475 /***********************************************************************
478 * Copies everything from src to dest
479 * if src is a LZ compressed file, it will be uncompressed.
480 * will return the number of bytes written to dest or errors.
482 LONG WINAPI
LZCopy( HFILE src
, HFILE dest
)
484 int usedlzinit
=0,ret
,wret
;
489 /* we need that weird typedef, for i can't seem to get function pointer
490 * casts right. (Or they probably just do not like WINAPI in general)
492 typedef UINT
WINAPI (*_readfun
)(HFILE
,LPVOID
,UINT
);
496 TRACE(file
,"(%d,%d)\n",src
,dest
);
497 if (!IS_LZ_HANDLE(src
)) {
499 if ((INT
)src
<= 0) return 0;
500 if (src
!= oldsrc
) usedlzinit
=1;
503 /* not compressed? just copy */
504 if (!IS_LZ_HANDLE(src
))
507 xread
=(_readfun
)LZRead
;
510 ret
=xread(src
,buf
,BUFLEN
);
519 wret
= _lwrite(dest
,buf
,ret
);
521 return LZERROR_WRITE
;
529 /* reverses GetExpandedPathname */
530 static LPSTR
LZEXPAND_MangleName( LPCSTR fn
)
533 char *mfn
= (char *)HEAP_xalloc( GetProcessHeap(), 0,
534 strlen(fn
) + 3 ); /* "._" and \0 */
536 if (!(p
= strrchr( mfn
, '\\' ))) p
= mfn
;
537 if ((p
= strchr( p
, '.' )))
540 if (strlen(p
) < 3) strcat( p
, "_" ); /* append '_' */
541 else p
[strlen(p
)-1] = '_'; /* replace last character */
543 else strcat( mfn
, "._" ); /* append "._" */
548 /***********************************************************************
549 * LZOpenFile16 (LZEXPAND.2)
551 HFILE16 WINAPI
LZOpenFile16( LPCSTR fn
, LPOFSTRUCT ofs
, UINT16 mode
)
553 HFILE hfret
= LZOpenFileA( fn
, ofs
, mode
);
554 /* return errors and LZ handles unmodified */
555 if ((INT
)hfret
<= 0) return hfret
;
556 if (IS_LZ_HANDLE(hfret
)) return hfret
;
557 /* but allocate a dos handle for 'normal' files */
558 return FILE_AllocDosHandle(hfret
);
562 /***********************************************************************
563 * LZOpenFile32A (LZ32.1)
565 * Opens a file. If not compressed, open it as a normal file.
567 HFILE WINAPI
LZOpenFileA( LPCSTR fn
, LPOFSTRUCT ofs
, UINT mode
)
571 TRACE(file
,"(%s,%p,%d)\n",fn
,ofs
,mode
);
572 /* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
573 fd
=OpenFile(fn
,ofs
,mode
);
576 LPSTR mfn
= LZEXPAND_MangleName(fn
);
577 fd
= OpenFile(mfn
,ofs
,mode
);
578 HeapFree( GetProcessHeap(), 0, mfn
);
580 if ((mode
&~0x70)!=OF_READ
)
585 if ((INT
)cfd
<= 0) return fd
;
590 /***********************************************************************
591 * LZOpenFile32W (LZ32.10)
593 HFILE WINAPI
LZOpenFileW( LPCWSTR fn
, LPOFSTRUCT ofs
, UINT mode
)
599 xfn
= HEAP_strdupWtoA( GetProcessHeap(), 0, fn
);
600 ret
= LZOpenFile16(xfn
,ofs
,mode
);
601 HeapFree( GetProcessHeap(), 0, xfn
);
602 if (ret
!=HFILE_ERROR
) {
603 /* ofs->szPathName is an array with the OFSTRUCT */
604 yfn
= HEAP_strdupAtoW( GetProcessHeap(), 0, ofs
->szPathName
);
605 memcpy(ofs
->szPathName
,yfn
,lstrlenW(yfn
)*2+2);
606 HeapFree( GetProcessHeap(), 0, yfn
);
612 /***********************************************************************
613 * LZClose16 (LZEXPAND.6)
615 void WINAPI
LZClose16( HFILE16 fd
)
617 if (IS_LZ_HANDLE(fd
)) LZClose( fd
);
618 else _lclose16( fd
);
622 /***********************************************************************
625 void WINAPI
LZClose( HFILE fd
)
629 TRACE(file
,"(%d)\n",fd
);
630 if (!(lzs
= GET_LZ_STATE(fd
))) _lclose(fd
);
633 if (lzs
->get
) HeapFree( GetProcessHeap(), 0, lzs
->get
);
634 CloseHandle(lzs
->realfd
);
635 lzstates
[fd
- 0x400] = NULL
;
636 HeapFree( SystemHeap
, 0, lzs
);
640 /***********************************************************************
641 * CopyLZFile16 (LZEXPAND.8)
643 LONG WINAPI
CopyLZFile16( HFILE16 src
, HFILE16 dest
)
645 TRACE(file
,"(%d,%d)\n",src
,dest
);
646 return LZCopy16(src
,dest
);
650 /***********************************************************************
651 * CopyLZFile32 (LZ32.7)
653 * Copy src to dest (including uncompressing src).
654 * NOTE: Yes. This is exactly the same function as LZCopy.
656 LONG WINAPI
CopyLZFile( HFILE src
, HFILE dest
)
658 TRACE(file
,"(%d,%d)\n",src
,dest
);
659 return LZCopy(src
,dest
);