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wine/dlls/lzexpand/lzexpand_main.c

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
/* Format of first 14 byte of LZ compressed file */
struct lzfileheader {
BYTE magic[8];
BYTE compressiontype;
CHAR lastchar;
DWORD reallength;
};
static BYTE LZMagic[8]={'S','Z','D','D',0x88,0xf0,0x27,0x33};
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[0x1000]; /* 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 IS_LZ_HANDLE(h) (((h) >= 0x400) && ((h) < 0x400+MAX_LZSTATES))
#define GET_LZ_STATE(h) (IS_LZ_HANDLE(h) ? lzstates[(h)-0x400] : 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[14];
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,14)<14)
return 0;
memcpy(head->magic,buf,8);
memcpy(&(head->compressiontype),buf+8,1);
memcpy(&(head->lastchar),buf+9,1);
/* FIXME: consider endianess on non-intel architectures */
memcpy(&(head->reallength),buf+10,4);
if (memcmp(head->magic,LZMagic,8))
return 0;
if (head->compressiontype!='A')
return LZERROR_UNKNOWNALG;
return 1;
}
/***********************************************************************
* LZStart (LZ32.@)
*/
INT WINAPI LZStart(void)
{
TRACE("(void)\n");
return 1;
}
/***********************************************************************
* LZInit (LZ32.@)
*
* 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(), 0, sizeof(struct lzstate) );
if(lzs == NULL) return LZERROR_GLOBALLOC;
memset(lzs,'\0',sizeof(*lzs));
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,' ',0x1000);
/* Yes, start 16 byte from the END of the table */
lzs->curtabent = 0xff0;
return 0x400 + i;
}
/***********************************************************************
* LZDone (LZEXPAND.9)
* LZDone (LZ32.@)
*/
void WINAPI LZDone(void)
{
TRACE("(void)\n");
}
/***********************************************************************
* GetExpandedNameA (LZ32.@)
*
* 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 (LZ32.@)
*/
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 (LZ32.@)
*/
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,14,SEEK_SET);
GET_FLUSH(lzs);
lzs->realcurrent= 0;
lzs->bytetype = 0;
lzs->stringlen = 0;
memset(lzs->table,' ',0x1000);
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 (LZ32.@)
*/
LONG WINAPI LZSeek( HFILE fd, LONG off, INT type )
{
struct lzstate *lzs;
LONG newwanted;
TRACE("(%d,%ld,%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 (LZ32.@)
*
* 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
BYTE 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((HANDLE)srcfd, NULL, NULL, &filetime);
SetFileTime((HANDLE)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 = (char *)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 (LZ32.@)
*
* 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 (LZ32.@)
*/
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 (LZ32.@)
*/
void WINAPI LZClose( HFILE fd )
{
struct lzstate *lzs;
TRACE("(%d)\n",fd);
if (!(lzs = GET_LZ_STATE(fd))) _lclose(fd);
else
{
if (lzs->get) HeapFree( GetProcessHeap(), 0, lzs->get );
CloseHandle((HANDLE)lzs->realfd);
lzstates[fd - 0x400] = NULL;
HeapFree( GetProcessHeap(), 0, lzs );
}
}
/***********************************************************************
* CopyLZFile (LZ32.@)
*
* Copy src to dest (including uncompressing src).
* NOTE: Yes. This is exactly the same function as LZCopy.
*/
LONG WINAPI CopyLZFile( HFILE src, HFILE dest )
{
TRACE("(%d,%d)\n",src,dest);
return LZCopy(src,dest);
}
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