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Sweden-Number/misc/lzexpand.c

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/*
* LZ Decompression functions
*
* Copyright 1996 Marcus Meissner
*/
/*
* FIXME: return values might be wrong
*/
#include <string.h>
#include <ctype.h>
#include "windows.h"
#include "file.h"
#include "heap.h"
#include "lzexpand.h"
#include "debug.h"
/* 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 {
HFILE32 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 */
UINT32 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)] : 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 = _lread32(lzs->realfd,lzs->get,GETLEN);
if (ret==HFILE_ERROR32)
return HFILE_ERROR32;
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 INT32 read_header(HFILE32 fd,struct lzfileheader *head)
{
BYTE buf[14];
if (_llseek32(fd,0,SEEK_SET)==-1)
return LZERROR_BADINHANDLE;
/* We can't directly read the lzfileheader struct due to
* structure element alignment
*/
if (_lread32(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;
}
/***********************************************************************
* LZStart16 (LZEXPAND.7)
*/
INT16 WINAPI LZStart16(void)
{
TRACE(file,"(void)\n");
return 1;
}
/***********************************************************************
* LZStart32 (LZ32.6)
*/
INT32 WINAPI LZStart32(void)
{
TRACE(file,"(void)\n");
return 1;
}
/***********************************************************************
* LZInit16 (LZEXPAND.3)
*/
HFILE16 WINAPI LZInit16( HFILE16 hfSrc )
{
return LZInit32( FILE_GetHandle32(hfSrc) );
}
/***********************************************************************
* LZInit32 (LZ32.2)
*
* 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
*/
HFILE32 WINAPI LZInit32( HFILE32 hfSrc )
{
struct lzfileheader head;
struct lzstate *lzs;
DWORD ret;
int i;
TRACE(file,"(%d)\n",hfSrc);
ret=read_header(hfSrc,&head);
if (ret<=0) {
_llseek32(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( SystemHeap, 0, sizeof(struct lzstate) );
memset(lzs,'\0',sizeof(*lzs));
lzs->realfd = hfSrc;
lzs->lastchar = head.lastchar;
lzs->reallength = head.reallength;
lzs->get = HEAP_xalloc( GetProcessHeap(), 0, GETLEN );
lzs->getlen = 0;
lzs->getcur = 0;
/* 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) (LZ32.8)
*/
void WINAPI LZDone(void)
{
TRACE(file,"(void)\n");
}
/***********************************************************************
* GetExpandedName16 (LZEXPAND.10)
*/
INT16 WINAPI GetExpandedName16( LPCSTR in, LPSTR out )
{
return (INT16)GetExpandedName32A( in, out );
}
/***********************************************************************
* GetExpandedName32A (LZ32.9)
*
* 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"
*/
INT32 WINAPI GetExpandedName32A( LPCSTR in, LPSTR out )
{
struct lzfileheader head;
HFILE32 fd;
OFSTRUCT ofs;
INT32 fnislowercased,ret,len;
LPSTR s,t;
TRACE(file,"(%s)\n",in);
fd=OpenFile32(in,&ofs,OF_READ);
if (fd==HFILE_ERROR32)
return (INT32)(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 */
_lclose32(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(file,"Specified a directory or what? (%s)\n",in);
_lclose32(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 */
_lclose32(fd);
return 1;
}
/***********************************************************************
* GetExpandedName32W (LZ32.11)
*/
INT32 WINAPI GetExpandedName32W( LPCWSTR in, LPWSTR out )
{
char *xin,*xout;
INT32 ret;
xout = HeapAlloc( GetProcessHeap(), 0, lstrlen32W(in)+3 );
xin = HEAP_strdupWtoA( GetProcessHeap(), 0, in );
ret = GetExpandedName16(xin,xout);
if (ret>0) lstrcpyAtoW(out,xout);
HeapFree( GetProcessHeap(), 0, xin );
HeapFree( GetProcessHeap(), 0, xout );
return ret;
}
/***********************************************************************
* LZRead16 (LZEXPAND.5)
*/
INT16 WINAPI LZRead16( HFILE16 fd, LPVOID buf, UINT16 toread )
{
if (IS_LZ_HANDLE(fd)) return LZRead32( fd, buf, toread );
return _lread16( fd, buf, toread );
}
/***********************************************************************
* LZRead32 (LZ32.4)
*/
INT32 WINAPI LZRead32( HFILE32 fd, LPVOID vbuf, UINT32 toread )
{
int howmuch;
BYTE b,*buf;
struct lzstate *lzs;
buf=(LPBYTE)vbuf;
TRACE(file,"(%d,%p,%d)\n",fd,buf,toread);
howmuch=toread;
if (!(lzs = GET_LZ_STATE(fd))) return _lread32(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 */
_llseek32(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
}
/***********************************************************************
* LZSeek16 (LZEXPAND.4)
*/
LONG WINAPI LZSeek16( HFILE16 fd, LONG off, INT16 type )
{
if (IS_LZ_HANDLE(fd)) return LZSeek32( fd, off, type );
return _llseek16( fd, off, type );
}
/***********************************************************************
* LZSeek32 (LZ32.3)
*/
LONG WINAPI LZSeek32( HFILE32 fd, LONG off, INT32 type )
{
struct lzstate *lzs;
LONG newwanted;
TRACE(file,"(%d,%ld,%d)\n",fd,off,type);
/* not compressed? just use normal _llseek() */
if (!(lzs = GET_LZ_STATE(fd))) return _llseek32(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;
}
/***********************************************************************
* LZCopy16 (LZEXPAND.1)
*
*/
LONG WINAPI LZCopy16( HFILE16 src, HFILE16 dest )
{
HFILE32 oldsrc = src;
int usedlzinit = 0;
LONG ret;
if (!IS_LZ_HANDLE(src))
{
src = LZInit16(src);
if (src!=oldsrc) usedlzinit=1;
if (src>0xfff0) return 0;
}
ret = LZCopy32( src, FILE_GetHandle32(dest) );
if (usedlzinit) LZClose32(src);
return ret;
}
/***********************************************************************
* LZCopy32 (LZ32.0)
*
* 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 LZCopy32( HFILE32 src, HFILE32 dest )
{
int usedlzinit=0,ret,wret;
LONG len;
HFILE32 oldsrc = src;
#define BUFLEN 1000
BYTE buf[BUFLEN];
INT32 WINAPI (*xread)(HFILE32,LPVOID,UINT32);
TRACE(file,"(%d,%d)\n",src,dest);
if (!IS_LZ_HANDLE(src)) {
src = LZInit32(src);
if (src!=oldsrc)
usedlzinit=1;
if (src>0xfff0)
return 0;
}
/* not compressed? just copy */
if (!IS_LZ_HANDLE(src))
xread=(INT32(*)(HFILE32,LPVOID,UINT32))_lread32;
else
xread=LZRead32;
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 = _lwrite32(dest,buf,ret);
if (wret!=ret)
return LZERROR_WRITE;
}
if (usedlzinit)
LZClose32(src);
return len;
#undef BUFLEN
}
/* reverses GetExpandedPathname */
static LPSTR LZEXPAND_MangleName( LPCSTR fn )
{
char *p;
char *mfn = (char *)HEAP_xalloc( GetProcessHeap(), 0,
strlen(fn) + 3 ); /* "._" and \0 */
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;
}
/***********************************************************************
* LZOpenFile16 (LZEXPAND.2)
*/
HFILE16 WINAPI LZOpenFile16( LPCSTR fn, LPOFSTRUCT ofs, UINT16 mode )
{
return LZOpenFile32A( fn, ofs, mode );
}
/***********************************************************************
* LZOpenFile32A (LZ32.1)
*
* Opens a file. If not compressed, open it as a normal file.
*/
HFILE32 WINAPI LZOpenFile32A( LPCSTR fn, LPOFSTRUCT ofs, UINT32 mode )
{
HFILE32 fd,cfd;
TRACE(file,"(%s,%p,%d)\n",fn,ofs,mode);
/* 0x70 represents all OF_SHARE_* flags, ignore them for the check */
fd=OpenFile32(fn,ofs,mode);
if (fd==HFILE_ERROR32)
{
LPSTR mfn = LZEXPAND_MangleName(fn);
fd = OpenFile32(mfn,ofs,mode);
HeapFree( GetProcessHeap(), 0, mfn );
}
if ((mode&~0x70)!=OF_READ)
return fd;
if (fd==HFILE_ERROR32)
return HFILE_ERROR32;
cfd=LZInit32(fd);
if (cfd<=0)
return fd;
return cfd;
}
/***********************************************************************
* LZOpenFile32W (LZ32.10)
*/
HFILE32 WINAPI LZOpenFile32W( LPCWSTR fn, LPOFSTRUCT ofs, UINT32 mode )
{
LPSTR xfn;
LPWSTR yfn;
HFILE32 ret;
xfn = HEAP_strdupWtoA( GetProcessHeap(), 0, fn);
ret = LZOpenFile16(xfn,ofs,mode);
HeapFree( GetProcessHeap(), 0, xfn );
if (ret!=HFILE_ERROR32) {
/* ofs->szPathName is an array with the OFSTRUCT */
yfn = HEAP_strdupAtoW( GetProcessHeap(), 0, ofs->szPathName );
memcpy(ofs->szPathName,yfn,lstrlen32W(yfn)*2+2);
HeapFree( GetProcessHeap(), 0, yfn );
}
return ret;
}
/***********************************************************************
* LZClose16 (LZEXPAND.6)
*/
void WINAPI LZClose16( HFILE16 fd )
{
if (IS_LZ_HANDLE(fd)) LZClose32( fd );
else _lclose16( fd );
}
/***********************************************************************
* LZClose32 (LZ32.5)
*/
void WINAPI LZClose32( HFILE32 fd )
{
struct lzstate *lzs;
TRACE(file,"(%d)\n",fd);
if (!(lzs = GET_LZ_STATE(fd))) _lclose32(fd);
else
{
if (lzs->get) HeapFree( GetProcessHeap(), 0, lzs->get );
CloseHandle(lzs->realfd);
lzstates[fd - 0x400] = NULL;
HeapFree( SystemHeap, 0, lzs );
}
}
/***********************************************************************
* CopyLZFile16 (LZEXPAND.8)
*/
LONG WINAPI CopyLZFile16( HFILE16 src, HFILE16 dest )
{
TRACE(file,"(%d,%d)\n",src,dest);
return LZCopy16(src,dest);
}
/***********************************************************************
* CopyLZFile32 (LZ32.7)
*
* Copy src to dest (including uncompressing src).
* NOTE: Yes. This is exactly the same function as LZCopy.
*/
LONG WINAPI CopyLZFile32( HFILE32 src, HFILE32 dest )
{
TRACE(file,"(%d,%d)\n",src,dest);
return LZCopy32(src,dest);
}
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