Release 20000130.

[wine.git] / misc / registry.c

/*
 *      Registry Functions
 *
 * Copyright 1996 Marcus Meissner
 * Copyright 1998 Matthew Becker
 * Copyright 1999 Sylvain St-Germain
 *
 * December 21, 1997 - Kevin Cozens
 * Fixed bugs in the _w95_loadreg() function. Added extra information
 * regarding the format of the Windows '95 registry files.
 *
 * NOTES
 *    When changing this file, please re-run the regtest program to ensure
 *    the conditions are handled properly.
 *
 * TODO
 *    Security access
 *    Option handling
 *    Time for RegEnumKey*, RegQueryInfoKey*
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#include <sys/types.h>
#include <fcntl.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <assert.h>
#include <time.h>
#include "windef.h"
#include "winbase.h"
#include "wine/winbase16.h"
#include "wine/winestring.h"
#include "winerror.h"
#include "file.h"
#include "heap.h"
#include "debugtools.h"
#include "xmalloc.h"
#include "options.h"
#include "winreg.h"
#include "server.h"
#include "services.h"

DEFAULT_DEBUG_CHANNEL(reg)

static void REGISTRY_Init(void);
/* FIXME: following defines should be configured global ... */

/* NOTE: do not append a /. linux' mkdir() WILL FAIL if you do that */
#define WINE_PREFIX                 "/.wine"
#define SAVE_USERS_DEFAULT          ETCDIR"/wine.userreg"
#define SAVE_LOCAL_MACHINE_DEFAULT  ETCDIR"/wine.systemreg"

/* relative in ~user/.wine/ : */
#define SAVE_CURRENT_USER           "user.reg"
#define SAVE_LOCAL_USERS_DEFAULT    "wine.userreg"
#define SAVE_LOCAL_MACHINE          "system.reg"

#define KEY_REGISTRY                "Software\\The WINE team\\WINE\\Registry"
#define VAL_SAVEUPDATED             "SaveOnlyUpdatedKeys"


/* what valuetypes do we need to convert? */
#define UNICONVMASK     ((1<<REG_SZ)|(1<<REG_MULTI_SZ)|(1<<REG_EXPAND_SZ))



/*
 * QUESTION
 *   Are these doing the same as HEAP_strdupAtoW and HEAP_strdupWtoA?
 *   If so, can we remove them?
 * ANSWER
 *   No, the memory handling functions are called very often in here, 
 *   just replacing them by HeapAlloc(SystemHeap,...) makes registry
 *   loading 100 times slower. -MM
 */
static LPWSTR strdupA2W(LPCSTR src)
{
    if(src) {
        LPWSTR dest=xmalloc(2*strlen(src)+2);
        lstrcpyAtoW(dest,src);
        return dest;
    }
    return NULL;
}

LPWSTR strcvtA2W(LPCSTR src, int nchars)

{
   LPWSTR dest = xmalloc (2 * nchars + 2);

   lstrcpynAtoW(dest,src,nchars+1);
   return dest;
}



/******************************************************************************
 * REGISTRY_Init [Internal]
 * Registry initialisation, allocates some default keys. 
 */
static void REGISTRY_Init(void) {
        HKEY    hkey;
        char    buf[200];

        TRACE("(void)\n");

        RegCreateKeyA(HKEY_DYN_DATA,"PerfStats\\StatData",&hkey);
        RegCloseKey(hkey);

        /* This was an Open, but since it is called before the real registries
           are loaded, it was changed to a Create - MTB 980507*/
        RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System",&hkey);
        RegSetValueExA(hkey,"Identifier",0,REG_SZ,"SystemType WINE",strlen("SystemType WINE"));
        RegCloseKey(hkey);

        /* \\SOFTWARE\\Microsoft\\Window NT\\CurrentVersion
         *                                              CurrentVersion
         *                                              CurrentBuildNumber
         *                                              CurrentType
         *                                      string  RegisteredOwner
         *                                      string  RegisteredOrganization
         *
         */
        /* System\\CurrentControlSet\\Services\\SNMP\\Parameters\\RFC1156Agent
         *                                      string  SysContact
         *                                      string  SysLocation
         *                                              SysServices
         */
        if (-1!=gethostname(buf,200)) {
                RegCreateKeyA(HKEY_LOCAL_MACHINE,"System\\CurrentControlSet\\Control\\ComputerName\\ComputerName",&hkey);
                RegSetValueExA(hkey,"ComputerName",0,REG_SZ,buf,strlen(buf)+1);
                RegCloseKey(hkey);
        }
}


/************************ SAVE Registry Function ****************************/

#define REGISTRY_SAVE_VERSION   0x00000001

/* Registry saveformat:
 * If you change it, increase above number by 1, which will flush
 * old registry database files.
 * 
 * Global:
 *      "WINE REGISTRY Version %d"
 *      subkeys....
 * Subkeys:
 *      keyname
 *              valuename=lastmodified,type,data
 *              ...
 *              subkeys
 *      ...
 * keyname,valuename,stringdata:
 *      the usual ascii characters from 0x00-0xff (well, not 0x00)
 *      and \uXXXX as UNICODE value XXXX with XXXX>0xff
 *      ( "=\\\t" escaped in \uXXXX form.)
 * type,lastmodified: 
 *      int
 * 
 * FIXME: doesn't save 'class' (what does it mean anyway?), nor flags.
 *
 * [HKEY_CURRENT_USER\\Software\\The WINE team\\WINE\\Registry]
 * SaveOnlyUpdatedKeys=yes
 */

/* Same as RegSaveKey but with Unix pathnames */
static void save_key( HKEY hkey, const char *filename )
{
    struct save_registry_request *req = get_req_buffer();
    int count = 0;
    DWORD ret;
    HANDLE handle;
    char *p;
    char *name = HeapAlloc( GetProcessHeap(), 0, strlen(filename) + 20 );

    if (!name) return;
    strcpy( name, filename );
    if ((p = strrchr( name, '/' ))) p++;
    else p = name;

    for (;;)
    {
        sprintf( p, "reg%04x.tmp", count++ );
        handle = FILE_CreateFile( name, GENERIC_WRITE, 0, NULL,
                                  CREATE_NEW, FILE_ATTRIBUTE_NORMAL, -1 );
        if (handle != INVALID_HANDLE_VALUE) break;
        if ((ret = GetLastError()) != ERROR_FILE_EXISTS) break;
    }

    if (handle != INVALID_HANDLE_VALUE)
    {
        req->hkey = hkey;
        req->file = handle;
        ret = server_call_noerr( REQ_SAVE_REGISTRY );
        CloseHandle( handle );
        if (ret) unlink( name );
        else if (rename( name, filename ) == -1)
        {
            ERR( "Failed to move %s to %s: ", name, filename );
            perror( "rename" );
            unlink( name );
        }
    }
    HeapFree( GetProcessHeap(), 0, name );
}


/******************************************************************************
 * SHELL_SaveRegistryBranch [Internal]
 *
 * Saves main registry branch specified by hkey.
 */
static void SHELL_SaveRegistryBranch(HKEY hkey)
{
    char   *fn, *home;

    /* Find out what to save to, get from config file */
    BOOL writeToHome = PROFILE_GetWineIniBool("registry","WritetoHomeRegistries",1);
    BOOL writeToAlt = PROFILE_GetWineIniBool("registry","WritetoAltRegistries",1);

    /* FIXME: does this check apply to all keys written below ? */
    if (!(home = getenv( "HOME" )))
        ERR("Failed to get homedirectory of UID %ld.\n",(long) getuid());

    /* HKEY_LOCAL_MACHINE contains the HKEY_CLASSES_ROOT branch */
    if (hkey == HKEY_CLASSES_ROOT) hkey = HKEY_LOCAL_MACHINE;

    switch (hkey)
    {
    case HKEY_CURRENT_USER:
        fn = xmalloc( MAX_PATHNAME_LEN ); 
        if (writeToAlt && PROFILE_GetWineIniString( "registry", "AltCurrentUserFile", "",
                                                    fn, MAX_PATHNAME_LEN - 1))
            save_key( HKEY_CURRENT_USER, fn );
        free (fn);

        if (home && writeToHome)
        {
            fn=(char*)xmalloc( strlen(home) + strlen(WINE_PREFIX) +
                               strlen(SAVE_CURRENT_USER) + 2 );
            strcpy(fn,home);
            strcat(fn,WINE_PREFIX);
  
            /* create the directory. don't care about errorcodes. */
            mkdir(fn,0755); /* drwxr-xr-x */
            strcat(fn,"/"SAVE_CURRENT_USER);
            save_key( HKEY_CURRENT_USER, fn );
            free(fn);
        }
        break;
    case HKEY_LOCAL_MACHINE:
        /* Try first saving according to the defined location in .winerc */
        fn = xmalloc ( MAX_PATHNAME_LEN);
        if (writeToAlt && PROFILE_GetWineIniString( "Registry", "AltLocalMachineFile", "", 
                                                    fn, MAX_PATHNAME_LEN - 1))
            save_key( HKEY_LOCAL_MACHINE, fn );
        free (fn);

        if (home && writeToHome)
        {
            fn=(char*)xmalloc( strlen(home) + strlen(WINE_PREFIX) +
                               strlen(SAVE_LOCAL_MACHINE) + 2);
            strcpy(fn,home);
            strcat(fn,WINE_PREFIX"/"SAVE_LOCAL_MACHINE);
            save_key( HKEY_LOCAL_MACHINE, fn );
            free(fn);
        }
        break;
    case HKEY_USERS:
        fn = xmalloc( MAX_PATHNAME_LEN );
        if (writeToAlt && PROFILE_GetWineIniString( "Registry", "AltUserFile", "", 
                                                    fn, MAX_PATHNAME_LEN - 1))
            save_key( HKEY_USERS, fn );
        free (fn);

        if (home && writeToHome)
        {
            fn=(char*)xmalloc( strlen(home) + strlen(WINE_PREFIX) +
                               strlen(SAVE_LOCAL_USERS_DEFAULT) + 2);
            strcpy(fn,home);
            strcat(fn,WINE_PREFIX"/"SAVE_LOCAL_USERS_DEFAULT);
            save_key( HKEY_USERS, fn );
            free(fn);
        }
        break;
    default:
        ERR("unknown/invalid key handle !\n");
        break;
    }
}


/******************************************************************************
 * SHELL_SaveRegistry [Internal]
 */
void SHELL_SaveRegistry( void )
{
    struct set_registry_levels_request *req = get_req_buffer();
    char   buf[4];
    HKEY   hkey;
    int    all;

    TRACE("(void)\n");

    all=0;
    if (RegOpenKeyA(HKEY_CURRENT_USER,KEY_REGISTRY,&hkey)!=ERROR_SUCCESS) 
    {
        strcpy(buf,"yes");
    } 
    else 
    {
        DWORD len,junk,type;

        len=4;
        if ((ERROR_SUCCESS!=RegQueryValueExA( hkey,
                                              VAL_SAVEUPDATED,
                                              &junk,
                                              &type,
                                              buf,
                                              &len)) || (type!=REG_SZ))
        {
            strcpy(buf,"yes");
        }
        RegCloseKey(hkey);
    }

    if (lstrcmpiA(buf,"yes")) all = 1;

    /* set saving level (0 for saving everything, 1 for saving only modified keys) */
    req->current = 1;
    req->saving  = !all;
    req->version = PROFILE_GetWineIniBool( "registry", "UseNewFormat", 0 ) ? 2 : 1;
    server_call( REQ_SET_REGISTRY_LEVELS );

    SHELL_SaveRegistryBranch(HKEY_CURRENT_USER);
    SHELL_SaveRegistryBranch(HKEY_LOCAL_MACHINE);
    SHELL_SaveRegistryBranch(HKEY_USERS);
}

/* Periodic save callback */
static void CALLBACK periodic_save( ULONG_PTR dummy )
{
    SHELL_SaveRegistry();
}

/************************ LOAD Registry Function ****************************/



/******************************************************************************
 * _find_or_add_key [Internal]
 */
static inline HKEY _find_or_add_key( HKEY hkey, LPWSTR keyname )
{
    HKEY subkey;
    if (RegCreateKeyW( hkey, keyname, &subkey ) != ERROR_SUCCESS) subkey = 0;
    if (keyname) free( keyname );
    return subkey;
}

/******************************************************************************
 * _find_or_add_value [Internal]
 */
static void _find_or_add_value( HKEY hkey, LPWSTR name, DWORD type, LPBYTE data, DWORD len )
{
    RegSetValueExW( hkey, name, 0, type, data, len );
    if (name) free( name );
    if (data) free( data );
}


/******************************************************************************
 * _wine_read_line [Internal]
 *
 * reads a line including dynamically enlarging the readbuffer and throwing
 * away comments
 */
static int _wine_read_line( FILE *F, char **buf, int *len )
{
        char    *s,*curread;
        int     mylen,curoff;

        curread = *buf;
        mylen   = *len;
        **buf   = '\0';
        while (1) {
                while (1) {
                        s=fgets(curread,mylen,F);
                        if (s==NULL)
                                return 0; /* EOF */
                        if (NULL==(s=strchr(curread,'\n'))) {
                                /* buffer wasn't large enough */
                                curoff  = strlen(*buf);
                                *buf    = xrealloc(*buf,*len*2);
                                curread = *buf + curoff;
                                mylen   = *len; /* we filled up the buffer and 
                                                 * got new '*len' bytes to fill
                                                 */
                                *len    = *len * 2;
                        } else {
                                *s='\0';
                                break;
                        }
                }
                /* throw away comments */
                if (**buf=='#' || **buf==';') {
                        curread = *buf;
                        mylen   = *len;
                        continue;
                }
                if (s)  /* got end of line */
                        break;
        }
        return 1;
}


/******************************************************************************
 * _wine_read_USTRING [Internal]
 *
 * converts a char* into a UNICODE string (up to a special char)
 * and returns the position exactly after that string
 */
static char* _wine_read_USTRING( char *buf, LPWSTR *str )
{
        char    *s;
        LPWSTR  ws;

        /* read up to "=" or "\0" or "\n" */
        s       = buf;
        *str    = (LPWSTR)xmalloc(2*strlen(buf)+2);
        ws      = *str;
        while (*s && (*s!='\n') && (*s!='=')) {
                if (*s!='\\')
                        *ws++=*((unsigned char*)s++);
                else {
                        s++;
                        if (!*s) {
                                /* Dangling \ ... may only happen if a registry
                                 * write was short. FIXME: What do to?
                                 */
                                 break;
                        }
                        if (*s=='\\') {
                                *ws++='\\';
                                s++;
                                continue;
                        }
                        if (*s!='u') {
                                WARN("Non unicode escape sequence \\%c found in |%s|\n",*s,buf);
                                *ws++='\\';
                                *ws++=*s++;
                        } else {
                                char    xbuf[5];
                                int     wc;

                                s++;
                                memcpy(xbuf,s,4);xbuf[4]='\0';
                                if (!sscanf(xbuf,"%x",&wc))
                                        WARN("Strange escape sequence %s found in |%s|\n",xbuf,buf);
                                s+=4;
                                *ws++   =(unsigned short)wc;
                        }
                }
        }
        *ws     = 0;
        return s;
}


/******************************************************************************
 * _wine_loadsubkey [Internal]
 *
 * NOTES
 *    It seems like this is returning a boolean.  Should it?
 *
 * RETURNS
 *    Success: 1
 *    Failure: 0
 */
static int _wine_loadsubkey( FILE *F, HKEY hkey, int level, char **buf, int *buflen )
{
        HKEY subkey;
        int             i;
        char            *s;
        LPWSTR          name;

    TRACE("(%p,%x,%d,%s,%d)\n", F, hkey, level, debugstr_a(*buf), *buflen);

    /* Good.  We already got a line here ... so parse it */
    subkey = 0;
    while (1) {
        i=0;s=*buf;
        while (*s=='\t') {
            s++;
            i++;
        }
        if (i>level) {
            if (!subkey) {
                WARN("Got a subhierarchy without resp. key?\n");
                return 0;
            }
            if (!_wine_loadsubkey(F,subkey,level+1,buf,buflen))
               if (!_wine_read_line(F,buf,buflen))
                  goto done;
            continue;
        }

                /* let the caller handle this line */
                if (i<level || **buf=='\0')
                        goto done;

                /* it can be: a value or a keyname. Parse the name first */
                s=_wine_read_USTRING(s,&name);

                /* switch() default: hack to avoid gotos */
                switch (0) {
                default:
                        if (*s=='\0') {
                                if (subkey) RegCloseKey( subkey );
                                subkey=_find_or_add_key(hkey,name);
                        } else {
                                LPBYTE          data;
                                int             len,lastmodified,type;

                                if (*s!='=') {
                                        WARN("Unexpected character: %c\n",*s);
                                        break;
                                }
                                s++;
                                if (2!=sscanf(s,"%d,%d,",&type,&lastmodified)) {
                                        WARN("Haven't understood possible value in |%s|, skipping.\n",*buf);
                                        break;
                                }
                                /* skip the 2 , */
                                s=strchr(s,',');s++;
                                s=strchr(s,',');
                                if (!s++) {
                                        WARN("Haven't understood possible value in |%s|, skipping.\n",*buf);
                                        break;
                                }
                                if (type == REG_SZ || type == REG_EXPAND_SZ) {
                                        s=_wine_read_USTRING(s,(LPWSTR*)&data);
                                        len = lstrlenW((LPWSTR)data)*2+2;
                                } else {
                                        len=strlen(s)/2;
                                        data = (LPBYTE)xmalloc(len+1);
                                        for (i=0;i<len;i++) {
                                                data[i]=0;
                                                if (*s>='0' && *s<='9')
                                                        data[i]=(*s-'0')<<4;
                                                if (*s>='a' && *s<='f')
                                                        data[i]=(*s-'a'+'\xa')<<4;
                                                if (*s>='A' && *s<='F')
                                                        data[i]=(*s-'A'+'\xa')<<4;
                                                s++;
                                                if (*s>='0' && *s<='9')
                                                        data[i]|=*s-'0';
                                                if (*s>='a' && *s<='f')
                                                        data[i]|=*s-'a'+'\xa';
                                                if (*s>='A' && *s<='F')
                                                        data[i]|=*s-'A'+'\xa';
                                                s++;
                                        }
                                }
                                _find_or_add_value(hkey,name,type,data,len);
                        }
                }
                /* read the next line */
                if (!_wine_read_line(F,buf,buflen))
                        goto done;
    }
 done:
    if (subkey) RegCloseKey( subkey );
    return 1;
}


/******************************************************************************
 * _wine_loadsubreg [Internal]
 */
static int _wine_loadsubreg( FILE *F, HKEY hkey, const char *fn )
{
        int     ver;
        char    *buf;
        int     buflen;

        buf=xmalloc(10);buflen=10;
        if (!_wine_read_line(F,&buf,&buflen)) {
                free(buf);
                return 0;
        }
        if (!sscanf(buf,"WINE REGISTRY Version %d",&ver)) {
                free(buf);
                return 0;
        }
        if (ver!=REGISTRY_SAVE_VERSION) {
            if (ver == 2)  /* new version */
            {
                HANDLE file;
                if ((file = FILE_CreateFile( fn, GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                             FILE_ATTRIBUTE_NORMAL, -1 )) != INVALID_HANDLE_VALUE)
                {
                    struct load_registry_request *req = get_req_buffer();
                    req->hkey    = hkey;
                    req->file    = file;
                    req->name[0] = 0;
                    server_call( REQ_LOAD_REGISTRY );
                    CloseHandle( file );
                }
                free( buf );
                return 1;
            }
            else
            {
                TRACE("Old format (%d) registry found, ignoring it. (buf was %s).\n",ver,buf);
                free(buf);
                return 0;
            }
        }
        if (!_wine_read_line(F,&buf,&buflen)) {
                free(buf);
                return 0;
        }
        if (!_wine_loadsubkey(F,hkey,0,&buf,&buflen)) {
                free(buf);
                return 0;
        }
        free(buf);
        return 1;
}


/******************************************************************************
 * _wine_loadreg [Internal]
 */
static void _wine_loadreg( HKEY hkey, char *fn )
{
    FILE *F;

    TRACE("(%x,%s)\n",hkey,debugstr_a(fn));

    F = fopen(fn,"rb");
    if (F==NULL) {
        WARN("Couldn't open %s for reading: %s\n",fn,strerror(errno) );
        return;
    }
    _wine_loadsubreg(F,hkey,fn);
    fclose(F);
}

/* NT REGISTRY LOADER */

#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif

#ifndef MAP_FAILED
#define MAP_FAILED ((LPVOID)-1)
#endif

#define  NT_REG_BLOCK_SIZE              0x1000

#define NT_REG_HEADER_BLOCK_ID       0x66676572 /* regf */
#define NT_REG_POOL_BLOCK_ID         0x6E696268 /* hbin */
#define NT_REG_KEY_BLOCK_ID          0x6b6e
#define NT_REG_VALUE_BLOCK_ID        0x6b76
#define NT_REG_HASH_BLOCK_ID         0x666c
#define NT_REG_NOHASH_BLOCK_ID       0x696c
#define NT_REG_KEY_BLOCK_TYPE        0x20
#define NT_REG_ROOT_KEY_BLOCK_TYPE   0x2c

typedef struct 
{
        DWORD   id;             /* 0x66676572 'regf'*/
        DWORD   uk1;            /* 0x04 */
        DWORD   uk2;            /* 0x08 */
        FILETIME        DateModified;   /* 0x0c */
        DWORD   uk3;            /* 0x14 */
        DWORD   uk4;            /* 0x18 */
        DWORD   uk5;            /* 0x1c */
        DWORD   uk6;            /* 0x20 */
        DWORD   RootKeyBlock;   /* 0x24 */
        DWORD   BlockSize;      /* 0x28 */
        DWORD   uk7[116];       
        DWORD   Checksum; /* at offset 0x1FC */
} nt_regf;

typedef struct
{
        DWORD   blocksize;
        BYTE    data[1];
} nt_hbin_sub;

typedef struct
{
        DWORD   id;             /* 0x6E696268 'hbin' */
        DWORD   off_prev;
        DWORD   off_next;
        DWORD   uk1;
        DWORD   uk2;            /* 0x10 */
        DWORD   uk3;            /* 0x14 */
        DWORD   uk4;            /* 0x18 */
        DWORD   size;           /* 0x1C */
        nt_hbin_sub     hbin_sub;       /* 0x20 */
} nt_hbin;

/*
 * the value_list consists of offsets to the values (vk)
 */
typedef struct
{
        WORD    SubBlockId;             /* 0x00 0x6B6E */
        WORD    Type;                   /* 0x02 for the root-key: 0x2C, otherwise 0x20*/
        FILETIME        writetime;      /* 0x04 */
        DWORD   uk1;                    /* 0x0C */
        DWORD   parent_off;             /* 0x10 Offset of Owner/Parent key */
        DWORD   nr_subkeys;             /* 0x14 number of sub-Keys */
        DWORD   uk8;                    /* 0x18 */
        DWORD   lf_off;                 /* 0x1C Offset of the sub-key lf-Records */
        DWORD   uk2;                    /* 0x20 */
        DWORD   nr_values;              /* 0x24 number of values */
        DWORD   valuelist_off;          /* 0x28 Offset of the Value-List */
        DWORD   off_sk;                 /* 0x2c Offset of the sk-Record */
        DWORD   off_class;              /* 0x30 Offset of the Class-Name */
        DWORD   uk3;                    /* 0x34 */
        DWORD   uk4;                    /* 0x38 */
        DWORD   uk5;                    /* 0x3c */
        DWORD   uk6;                    /* 0x40 */
        DWORD   uk7;                    /* 0x44 */
        WORD    name_len;               /* 0x48 name-length */
        WORD    class_len;              /* 0x4a class-name length */
        char    name[1];                /* 0x4c key-name */
} nt_nk;

typedef struct
{
        DWORD   off_nk; /* 0x00 */
        DWORD   name;   /* 0x04 */
} hash_rec;

typedef struct
{
        WORD    id;             /* 0x00 0x666c */
        WORD    nr_keys;        /* 0x06 */
        hash_rec        hash_rec[1];
} nt_lf;

typedef struct
{
        WORD    id;             /* 0x00 0x696c */
        WORD    nr_keys;
        DWORD   off_nk[1];
} nt_il;

typedef struct
{
        WORD    id;             /* 0x00 'vk' */
        WORD    nam_len;
        DWORD   data_len;
        DWORD   data_off;
        DWORD   type;
        WORD    flag;
        WORD    uk1;
        char    name[1];
} nt_vk;

LPSTR _strdupnA( LPCSTR str, int len )
{
    LPSTR ret;

    if (!str) return NULL;
    ret = malloc( len + 1 );
    lstrcpynA( ret, str, len );
    ret[len] = 0x00;
    return ret;
}

static int _nt_parse_nk(HKEY hkey, char * base, nt_nk * nk, int level);
static int _nt_parse_vk(HKEY hkey, char * base, nt_vk * vk);
static int _nt_parse_lf(HKEY hkey, char * base, nt_lf * lf, int level);


/*
 * gets a value
 *
 * vk->flag:
 *  0 value is a default value
 *  1 the value has a name
 *
 * vk->data_len
 *  len of the whole data block
 *  - reg_sz (unicode)
 *    bytes including the terminating \0 = 2*(number_of_chars+1)
 *  - reg_dword, reg_binary:
 *    if highest bit of data_len is set data_off contains the value
 */
static int _nt_parse_vk(HKEY hkey, char * base, nt_vk * vk)
{
        WCHAR name [256];
        DWORD ret;
        BYTE * pdata = (BYTE *)(base+vk->data_off+4); /* start of data */

        if(vk->id != NT_REG_VALUE_BLOCK_ID) goto error;

        lstrcpynAtoW(name, vk->name, vk->nam_len+1);

        ret = RegSetValueExW( hkey, (vk->flag & 0x00000001) ? name : NULL, 0, vk->type,
                        (vk->data_len & 0x80000000) ? (LPBYTE)&(vk->data_off): pdata,
                        (vk->data_len & 0x7fffffff) );
        if (ret) ERR("RegSetValueEx failed (0x%08lx)\n", ret);
        return TRUE;
error:
        ERR_(reg)("vk block invalid\n");
        return FALSE;
}

/*
 * get the subkeys
 *
 * this structure contains the hash of a keyname and points to all
 * subkeys
 *
 * exception: if the id is 'il' there are no hash values and every 
 * dword is a offset
 */
static int _nt_parse_lf(HKEY hkey, char * base, nt_lf * lf, int level)
{
        int i;

        if (lf->id == NT_REG_HASH_BLOCK_ID)
        {
          for (i=0; i<lf->nr_keys; i++)
          {
            if (!_nt_parse_nk(hkey, base, (nt_nk*)(base+lf->hash_rec[i].off_nk+4), level)) goto error;
          }
          
        }
        else if (lf->id == NT_REG_NOHASH_BLOCK_ID)
        {
          for (i=0; i<lf->nr_keys; i++)
          {
            if (!_nt_parse_nk(hkey, base, (nt_nk*)(base+((nt_il*)lf)->off_nk[i]+4), level)) goto error;
          }
        }
        return TRUE;
        
error:  ERR_(reg)("error reading lf block\n");
        return FALSE;
}

static int _nt_parse_nk(HKEY hkey, char * base, nt_nk * nk, int level)
{
        char * name;
        int i;
        DWORD * vl;
        HKEY subkey = hkey;

        if(nk->SubBlockId != NT_REG_KEY_BLOCK_ID) goto error;
        if((nk->Type!=NT_REG_ROOT_KEY_BLOCK_TYPE) &&
           (((nt_nk*)(base+nk->parent_off+4))->SubBlockId != NT_REG_KEY_BLOCK_ID)) goto error;

        /* create the new key */
        if(level <= 0)
        {
          name = _strdupnA( nk->name, nk->name_len+1);
          if(RegCreateKeyA( hkey, name, &subkey )) { free(name); goto error; }
          free(name);
        }

        /* loop through the subkeys */
        if (nk->nr_subkeys)
        {
          nt_lf * lf = (nt_lf*)(base+nk->lf_off+4);
          if (nk->nr_subkeys != lf->nr_keys) goto error1;
          if (!_nt_parse_lf(subkey, base, lf, level-1)) goto error1;
        }

        /* loop trough the value list */
        vl = (DWORD *)(base+nk->valuelist_off+4);
        for (i=0; i<nk->nr_values; i++)
        {
          nt_vk * vk = (nt_vk*)(base+vl[i]+4);
          if (!_nt_parse_vk(subkey, base, vk)) goto error1;
        }

        RegCloseKey(subkey);
        return TRUE;
        
error1: RegCloseKey(subkey);
error:  ERR_(reg)("error reading nk block\n");
        return FALSE;
}

/* end nt loader */

/* windows 95 registry loader */

/* SECTION 1: main header
 *
 * once at offset 0
 */
#define W95_REG_CREG_ID 0x47455243

typedef struct 
{
        DWORD   id;             /* "CREG" = W95_REG_CREG_ID */
        DWORD   version;        /* ???? 0x00010000 */
        DWORD   rgdb_off;       /* 0x08 Offset of 1st RGDB-block */
        DWORD   uk2;            /* 0x0c */
        WORD    rgdb_num;       /* 0x10 # of RGDB-blocks */
        WORD    uk3;
        DWORD   uk[3];
        /* rgkn */
} _w95creg;

/* SECTION 2: Directory information (tree structure)
 *
 * once on offset 0x20
 *
 * structure: [rgkn][dke]*      (repeat till rgkn->size is reached)
 */
#define W95_REG_RGKN_ID 0x4e4b4752

typedef struct
{
        DWORD   id;             /*"RGKN" = W95_REG_RGKN_ID */
        DWORD   size;           /* Size of the RGKN-block */
        DWORD   root_off;       /* Rel. Offset of the root-record */
        DWORD   uk[5];
} _w95rgkn;

/* Disk Key Entry Structure
 *
 * the 1st entry in a "usual" registry file is a nul-entry with subkeys: the
 * hive itself. It looks the same like other keys. Even the ID-number can
 * be any value.
 *
 * The "hash"-value is a value representing the key's name. Windows will not
 * search for the name, but for a matching hash-value. if it finds one, it
 * will compare the actual string info, otherwise continue with the next key.
 * To calculate the hash initialize a D-Word with 0 and add all ASCII-values 
 * of the string which are smaller than 0x80 (128) to this D-Word.   
 *
 * If you want to modify key names, also modify the hash-values, since they
 * cannot be found again (although they would be displayed in REGEDIT)
 * End of list-pointers are filled with 0xFFFFFFFF
 *
 * Disk keys are layed out flat ... But, sometimes, nrLS and nrHS are both
 * 0xFFFF, which means skipping over nextkeyoffset bytes (including this
 * structure) and reading another RGDB_section.
 *
 * there is a one to one relationship between dke and dkh
 */
 /* key struct, once per key */
typedef struct
{
        DWORD   x1;             /* Free entry indicator(?) */
        DWORD   hash;           /* sum of bytes of keyname */
        DWORD   x3;             /* Root key indicator? usually 0xFFFFFFFF */
        DWORD   prevlvl;        /* offset of previous key */
        DWORD   nextsub;        /* offset of child key */
        DWORD   next;           /* offset of sibling key */
        WORD    nrLS;           /* id inside the rgdb block */
        WORD    nrMS;           /* number of the rgdb block */
} _w95dke;

/* SECTION 3: key information, values and data
 *
 * structure:
 *  section:    [blocks]*               (repeat creg->rgdb_num times)
 *  blocks:     [rgdb] [subblocks]*     (repeat till block size reached )
 *  subblocks:  [dkh] [dkv]*            (repeat dkh->values times )
 *
 * An interesting relationship exists in RGDB_section. The value at offset
 * 10 equals the value at offset 4 minus the value at offset 8. I have no
 * idea at the moment what this means.  (Kevin Cozens)
 */

/* block header, once per block */
#define W95_REG_RGDB_ID 0x42444752

typedef struct
{
        DWORD   id;     /* 0x00 'rgdb' = W95_REG_RGDB_ID */
        DWORD   size;   /* 0x04 */
        DWORD   uk1;    /* 0x08 */
        DWORD   uk2;    /* 0x0c */
        DWORD   uk3;    /* 0x10 */
        DWORD   uk4;    /* 0x14 */
        DWORD   uk5;    /* 0x18 */
        DWORD   uk6;    /* 0x1c */
        /* dkh */
} _w95rgdb;

/* Disk Key Header structure (RGDB part), once per key */
typedef struct 
{
        DWORD   nextkeyoff;     /* 0x00 offset to next dkh*/
        WORD    nrLS;           /* 0x04 id inside the rgdb block */
        WORD    nrMS;           /* 0x06 number of the rgdb block */
        DWORD   bytesused;      /* 0x08 */
        WORD    keynamelen;     /* 0x0c len of name */
        WORD    values;         /* 0x0e number of values */
        DWORD   xx1;            /* 0x10 */
        char    name[1];        /* 0x14 */
        /* dkv */               /* 0x14 + keynamelen */
} _w95dkh;

/* Disk Key Value structure, once per value */
typedef struct
{
        DWORD   type;           /* 0x00 */
        DWORD   x1;             /* 0x04 */
        WORD    valnamelen;     /* 0x08 length of name, 0 is default key */
        WORD    valdatalen;     /* 0x0A length of data */
        char    name[1];        /* 0x0c */
        /* raw data */          /* 0x0c + valnamelen */
} _w95dkv;

/******************************************************************************
 * _w95_lookup_dkh [Internal]
 *
 * seeks the dkh belonging to a dke
 */
static _w95dkh * _w95_lookup_dkh (_w95creg *creg, int nrLS, int nrMS)
{
        _w95rgdb * rgdb;
        _w95dkh * dkh;
        int i;
        
        rgdb = (_w95rgdb*)((char*)creg+creg->rgdb_off);         /* get the beginning of the rgdb datastore */
        assert (creg->rgdb_num > nrMS);                         /* check: requested block < last_block) */
        
        /* find the right block */
        for(i=0; i<nrMS ;i++)
        {
          assert(rgdb->id == W95_REG_RGDB_ID);                          /* check the magic */
          rgdb = (_w95rgdb*) ((char*)rgdb+rgdb->size);          /* find next block */
        }

        dkh = (_w95dkh*)(rgdb + 1);                             /* first sub block within the rgdb */

        do
        {
          if(nrLS==dkh->nrLS ) return dkh;
          dkh = (_w95dkh*)((char*)dkh + dkh->nextkeyoff);       /* find next subblock */
        } while ((char *)dkh < ((char*)rgdb+rgdb->size));

        return NULL;
}       
 
/******************************************************************************
 * _w95_parse_dkv [Internal]
 */
static int _w95_parse_dkv (
        HKEY hkey,
        _w95dkh * dkh,
        int nrLS,
        int nrMS )
{
        _w95dkv * dkv;
        int i;
        DWORD ret;
        char * name;
                        
        /* first value block */
        dkv = (_w95dkv*)((char*)dkh+dkh->keynamelen+0x14);

        /* loop trought the values */
        for (i=0; i< dkh->values; i++)
        {
          name = _strdupnA(dkv->name, dkv->valnamelen+1);
          ret = RegSetValueExA(hkey, name, 0, dkv->type, &(dkv->name[dkv->valnamelen]),dkv->valdatalen); 
          if (ret) ERR("RegSetValueEx failed (0x%08lx)\n", ret);
          free (name);

          /* next value */
          dkv = (_w95dkv*)((char*)dkv+dkv->valnamelen+dkv->valdatalen+0x0c);
        }
        return TRUE;
}

/******************************************************************************
 * _w95_parse_dke [Internal]
 */
static int _w95_parse_dke( 
        HKEY hkey,
        _w95creg * creg,
        _w95rgkn *rgkn,
        _w95dke * dke,
        int level )
{
        _w95dkh * dkh;
        HKEY hsubkey = hkey;
        char * name;
        int ret = FALSE;

        /* get start address of root key block */
        if (!dke) dke = (_w95dke*)((char*)rgkn + rgkn->root_off);
        
        /* special root key */
        if (dke->nrLS == 0xffff || dke->nrMS==0xffff)           /* eg. the root key has no name */
        {
          /* parse the one subkey*/
          if (dke->nextsub != 0xffffffff) 
          {
            return _w95_parse_dke(hsubkey, creg, rgkn, (_w95dke*)((char*)rgkn+dke->nextsub), level);
          }
          /* has no sibling keys */
          goto error;
        }

        /* search subblock */
        if (!(dkh = _w95_lookup_dkh(creg, dke->nrLS, dke->nrMS)))
        {
          fprintf(stderr, "dke pointing to missing dkh !\n");
          goto error;
        }

        if ( level <= 0 )
        {
          /* walk sibling keys */
          if (dke->next != 0xffffffff )
          {
            if (!_w95_parse_dke(hkey, creg, rgkn, (_w95dke*)((char*)rgkn+dke->next), level)) goto error;
          }

          /* create subkey and insert values */
          name = _strdupnA( dkh->name, dkh->keynamelen+1);
          if (RegCreateKeyA(hkey, name, &hsubkey)) { free(name); goto error; }
          free(name);
          if (!_w95_parse_dkv(hsubkey, dkh, dke->nrLS, dke->nrMS)) goto error1;
        }  
        
        /* next sub key */
        if (dke->nextsub != 0xffffffff) 
        {
          if (!_w95_parse_dke(hsubkey, creg, rgkn, (_w95dke*)((char*)rgkn+dke->nextsub), level-1)) goto error1;
        }

        ret = TRUE;
error1: if (hsubkey != hkey) RegCloseKey(hsubkey);
error:  return ret;
}
/* end windows 95 loader */

/******************************************************************************
 *      NativeRegLoadKey [Internal]
 *
 * Loads a native registry file (win95/nt)
 *      hkey    root key
 *      fn      filename
 *      level   number of levels to cut away (eg. ".Default" in user.dat)
 *
 * this function intentionally uses unix file functions to make it possible
 * to move it to a seperate registry helper programm
 */
static int NativeRegLoadKey( HKEY hkey, char* fn, int level )
{
        int fd = 0;
        struct stat st;
        DOS_FULL_NAME full_name;
        int ret = FALSE;
        void * base;
                        
        if (!DOSFS_GetFullName( fn, 0, &full_name )) return FALSE;
        
        /* map the registry into the memory */
        if ((fd = open(full_name.long_name, O_RDONLY | O_NONBLOCK)) == -1) return FALSE;
        if ((fstat(fd, &st) == -1)) goto error;
        if ((base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED) goto error;

        switch (*(LPDWORD)base)
        {
          /* windows 95 'creg' */
          case W95_REG_CREG_ID:
            {
              _w95creg * creg;
              _w95rgkn * rgkn;
              creg = base;
              TRACE_(reg)("Loading win95 registry '%s' '%s'\n",fn, full_name.long_name);

              /* load the header (rgkn) */
              rgkn = (_w95rgkn*)(creg + 1);
              if (rgkn->id != W95_REG_RGKN_ID) 
              {
                ERR("second IFF header not RGKN, but %lx\n", rgkn->id);
                goto error1;
              }

              ret = _w95_parse_dke(hkey, creg, rgkn, NULL, level);
            }
            break;
          /* nt 'regf'*/
          case NT_REG_HEADER_BLOCK_ID:
            {
              nt_regf * regf;
              nt_hbin * hbin;
              nt_hbin_sub * hbin_sub;
              nt_nk* nk;

              TRACE_(reg)("Loading nt registry '%s' '%s'\n",fn, full_name.long_name);

              /* start block */
              regf = base;

              /* hbin block */
              hbin = base + 0x1000;
              if (hbin->id != NT_REG_POOL_BLOCK_ID)
              {
                ERR_(reg)( "%s hbin block invalid\n", fn);
                goto error1;
              }

              /* hbin_sub block */
              hbin_sub = (nt_hbin_sub*)&(hbin->hbin_sub);
              if ((hbin_sub->data[0] != 'n') || (hbin_sub->data[1] != 'k'))
              {
                ERR_(reg)( "%s hbin_sub block invalid\n", fn);
                goto error1;
              }

              /* nk block */
              nk = (nt_nk*)&(hbin_sub->data[0]);
              if (nk->Type != NT_REG_ROOT_KEY_BLOCK_TYPE)
              {
                ERR_(reg)( "%s special nk block not found\n", fn);
                goto error1;
              }

              ret = _nt_parse_nk (hkey, base+0x1000, nk, level);
            }
            break;
          default:
            {
              ERR("unknown signature in registry file %s.\n",fn);
              goto error1;
            }
        }
        if(!ret) ERR("error loading registry file %s\n", fn);
error1: munmap(base, st.st_size);
error:  close(fd);
        return ret;     
}

/* WINDOWS 31 REGISTRY LOADER, supplied by Tor Sjøwall, tor@sn.no */
/*
    reghack - windows 3.11 registry data format demo program.

    The reg.dat file has 3 parts, a header, a table of 8-byte entries that is
    a combined hash table and tree description, and finally a text table.

    The header is obvious from the struct header. The taboff1 and taboff2
    fields are always 0x20, and their usage is unknown.

    The 8-byte entry table has various entry types.

    tabent[0] is a root index. The second word has the index of the root of
            the directory.
    tabent[1..hashsize] is a hash table. The first word in the hash entry is
            the index of the key/value that has that hash. Data with the same
            hash value are on a circular list. The other three words in the
            hash entry are always zero.
    tabent[hashsize..tabcnt] is the tree structure. There are two kinds of
            entry: dirent and keyent/valent. They are identified by context.
    tabent[freeidx] is the first free entry. The first word in a free entry
            is the index of the next free entry. The last has 0 as a link.
            The other three words in the free list are probably irrelevant.

    Entries in text table are preceeded by a word at offset-2. This word
    has the value (2*index)+1, where index is the referring keyent/valent
    entry in the table. I have no suggestion for the 2* and the +1.
    Following the word, there are N bytes of data, as per the keyent/valent
    entry length. The offset of the keyent/valent entry is from the start
    of the text table to the first data byte.

    This information is not available from Microsoft. The data format is
    deduced from the reg.dat file by me. Mistakes may
    have been made. I claim no rights and give no guarantees for this program.

    Tor Sjøwall, tor@sn.no
*/

/* reg.dat header format */
struct _w31_header {
        char            cookie[8];      /* 'SHCC3.10' */
        unsigned long   taboff1;        /* offset of hash table (??) = 0x20 */
        unsigned long   taboff2;        /* offset of index table (??) = 0x20 */
        unsigned long   tabcnt;         /* number of entries in index table */
        unsigned long   textoff;        /* offset of text part */
        unsigned long   textsize;       /* byte size of text part */
        unsigned short  hashsize;       /* hash size */
        unsigned short  freeidx;        /* free index */
};

/* generic format of table entries */
struct _w31_tabent {
        unsigned short w0, w1, w2, w3;
};

/* directory tabent: */
struct _w31_dirent {
        unsigned short  sibling_idx;    /* table index of sibling dirent */
        unsigned short  child_idx;      /* table index of child dirent */
        unsigned short  key_idx;        /* table index of key keyent */
        unsigned short  value_idx;      /* table index of value valent */
};

/* key tabent: */
struct _w31_keyent {
        unsigned short  hash_idx;       /* hash chain index for string */
        unsigned short  refcnt;         /* reference count */
        unsigned short  length;         /* length of string */
        unsigned short  string_off;     /* offset of string in text table */
};

/* value tabent: */
struct _w31_valent {
        unsigned short  hash_idx;       /* hash chain index for string */
        unsigned short  refcnt;         /* reference count */
        unsigned short  length;         /* length of string */
        unsigned short  string_off;     /* offset of string in text table */
};

/* recursive helper function to display a directory tree */
void
__w31_dumptree( unsigned short idx,
                unsigned char *txt,
                struct _w31_tabent *tab,
                struct _w31_header *head,
                HKEY hkey,
                time_t          lastmodified,
                int             level
) {
        struct _w31_dirent      *dir;
        struct _w31_keyent      *key;
        struct _w31_valent      *val;
        HKEY subkey = 0;
        static char             tail[400];

        while (idx!=0) {
                dir=(struct _w31_dirent*)&tab[idx];

                if (dir->key_idx) {
                        key = (struct _w31_keyent*)&tab[dir->key_idx];

                        memcpy(tail,&txt[key->string_off],key->length);
                        tail[key->length]='\0';
                        /* all toplevel entries AND the entries in the 
                         * toplevel subdirectory belong to \SOFTWARE\Classes
                         */
                        if (!level && !lstrcmpA(tail,".classes")) {
                                __w31_dumptree(dir->child_idx,txt,tab,head,hkey,lastmodified,level+1);
                                idx=dir->sibling_idx;
                                continue;
                        }
                        if (subkey) RegCloseKey( subkey );
                        if (RegCreateKeyA( hkey, tail, &subkey ) != ERROR_SUCCESS) subkey = 0;
                        /* only add if leaf node or valued node */
                        if (dir->value_idx!=0||dir->child_idx==0) {
                                if (dir->value_idx) {
                                        val=(struct _w31_valent*)&tab[dir->value_idx];
                                        memcpy(tail,&txt[val->string_off],val->length);
                                        tail[val->length]='\0';
                                        RegSetValueA( subkey, NULL, REG_SZ, tail, 0 );
                                }
                        }
                } else {
                        TRACE("strange: no directory key name, idx=%04x\n", idx);
                }
                __w31_dumptree(dir->child_idx,txt,tab,head,subkey,lastmodified,level+1);
                idx=dir->sibling_idx;
        }
        if (subkey) RegCloseKey( subkey );
}


/******************************************************************************
 * _w31_loadreg [Internal]
 */
void _w31_loadreg(void) {
        HFILE                   hf;
        struct _w31_header      head;
        struct _w31_tabent      *tab;
        unsigned char           *txt;
        int                     len;
        OFSTRUCT                ofs;
        BY_HANDLE_FILE_INFORMATION hfinfo;
        time_t                  lastmodified;

        TRACE("(void)\n");

        hf = OpenFile("reg.dat",&ofs,OF_READ);
        if (hf==HFILE_ERROR)
                return;

        /* read & dump header */
        if (sizeof(head)!=_lread(hf,&head,sizeof(head))) {
                ERR("reg.dat is too short.\n");
                _lclose(hf);
                return;
        }
        if (memcmp(head.cookie, "SHCC3.10", sizeof(head.cookie))!=0) {
                ERR("reg.dat has bad signature.\n");
                _lclose(hf);
                return;
        }

        len = head.tabcnt * sizeof(struct _w31_tabent);
        /* read and dump index table */
        tab = xmalloc(len);
        if (len!=_lread(hf,tab,len)) {
                ERR("couldn't read %d bytes.\n",len); 
                free(tab);
                _lclose(hf);
                return;
        }

        /* read text */
        txt = xmalloc(head.textsize);
        if (-1==_llseek(hf,head.textoff,SEEK_SET)) {
                ERR("couldn't seek to textblock.\n"); 
                free(tab);
                free(txt);
                _lclose(hf);
                return;
        }
        if (head.textsize!=_lread(hf,txt,head.textsize)) {
                ERR("textblock too short (%d instead of %ld).\n",len,head.textsize); 
                free(tab);
                free(txt);
                _lclose(hf);
                return;
        }

        if (!GetFileInformationByHandle(hf,&hfinfo)) {
                ERR("GetFileInformationByHandle failed?.\n"); 
                free(tab);
                free(txt);
                _lclose(hf);
                return;
        }
        lastmodified = DOSFS_FileTimeToUnixTime(&hfinfo.ftLastWriteTime,NULL);
        __w31_dumptree(tab[0].w1,txt,tab,&head,HKEY_CLASSES_ROOT,lastmodified,0);
        free(tab);
        free(txt);
        _lclose(hf);
        return;
}

/**********************************************************************************
 * SetLoadLevel [Internal]
 *
 * set level to 0 for loading system files
 * set level to 1 for loading user files
 */
static void SetLoadLevel(int level)
{
        struct set_registry_levels_request *req = get_req_buffer();

        req->current = level;
        req->saving  = 0;
        req->version = 1;
        server_call( REQ_SET_REGISTRY_LEVELS );
}

/**********************************************************************************
 * SHELL_LoadRegistry [Internal]
 */
#define REG_DONTLOAD -1
#define REG_WIN31  0
#define REG_WIN95  1
#define REG_WINNT  2

void SHELL_LoadRegistry( void )
{
  int   save_timeout;
  char  *fn, *home;
  HKEY  hkey;
  char windir[MAX_PATHNAME_LEN];
  char path[MAX_PATHNAME_LEN];
  int  systemtype = REG_WIN31;

  TRACE("(void)\n");

  if (!CLIENT_IsBootThread()) return;  /* already loaded */

  REGISTRY_Init();
  SetLoadLevel(0);

  GetWindowsDirectoryA( windir, MAX_PATHNAME_LEN );

  if (PROFILE_GetWineIniBool( "Registry", "LoadWindowsRegistryFiles", 1))
  {
    /* test %windir%/system32/config/system --> winnt */
    strcpy(path, windir);
    strncat(path, "\\system32\\config\\system", MAX_PATHNAME_LEN - strlen(path) - 1);
    if(GetFileAttributesA(path) != -1) 
    {
      systemtype = REG_WINNT;
    }
    else
    {
       /* test %windir%/system.dat --> win95 */
      strcpy(path, windir);
      strncat(path, "\\system.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
      if(GetFileAttributesA(path) != -1)
      {
        systemtype = REG_WIN95;
      }
    }

    if ((systemtype==REG_WINNT)
      && (! PROFILE_GetWineIniString( "Wine", "Profile", "", path, MAX_PATHNAME_LEN)))
    {
       MESSAGE("When you are running with a native NT directory specify\n");
       MESSAGE("'Profile=<profiledirectory>' or disable loading of Windows\n");
       MESSAGE("registry (LoadWindowsRegistryFiles=N)\n");
       systemtype = REG_DONTLOAD;
    }
  }
  else
  {
    /* only wine registry */
    systemtype = REG_DONTLOAD;
  }  

  switch (systemtype)
  {
    case REG_WIN31:
      _w31_loadreg();
      break;

    case REG_WIN95:  
      /* Load windows 95 entries */
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, "C:\\system.1st", 0);

      strcpy(path, windir);
      strncat(path, "\\system.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, path, 0);

      if (PROFILE_GetWineIniString( "Wine", "Profile", "", path, MAX_PATHNAME_LEN))
      {
        /* user specific user.dat */
        strncat(path, "\\user.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
        if (!NativeRegLoadKey( HKEY_CURRENT_USER, path, 1 ))
        {
          MESSAGE("can't load win95 user-registry %s\n", path);
          MESSAGE("check wine.conf, section [Wine], value 'Profile'\n");
        }
        /* default user.dat */
        if (!RegCreateKeyA(HKEY_USERS, ".Default", &hkey))
        {
          strcpy(path, windir);
          strncat(path, "\\user.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
          NativeRegLoadKey(hkey, path, 1);
          RegCloseKey(hkey);
        }
      }
      else
      {
        /* global user.dat */
        strcpy(path, windir);
        strncat(path, "\\user.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
        NativeRegLoadKey(HKEY_CURRENT_USER, path, 1);
      }
      break;

    case REG_WINNT:  
      /* default user.dat */
      if (PROFILE_GetWineIniString( "Wine", "Profile", "", path, MAX_PATHNAME_LEN))
      {
        strncat(path, "\\ntuser.dat", MAX_PATHNAME_LEN - strlen(path) - 1);
        if(!NativeRegLoadKey( HKEY_CURRENT_USER, path, 1 ))
        {
           MESSAGE("can't load NT user-registry %s\n", path);
           MESSAGE("check wine.conf, section [Wine], value 'Profile'\n");
        }
      }

      /* default user.dat */
      if (!RegCreateKeyA(HKEY_USERS, ".Default", &hkey))
      {
        strcpy(path, windir);
        strncat(path, "\\system32\\config\\default", MAX_PATHNAME_LEN - strlen(path) - 1);
        NativeRegLoadKey(hkey, path, 1);
        RegCloseKey(hkey);
      }

      /*
      * FIXME
      *  map HLM\System\ControlSet001 to HLM\System\CurrentControlSet
      */

      strcpy(path, windir);
      strncat(path, "\\system32\\config\\system", MAX_PATHNAME_LEN - strlen(path) - 1);
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, path, 0);

      strcpy(path, windir);
      strncat(path, "\\system32\\config\\software", MAX_PATHNAME_LEN - strlen(path) - 1);
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, path, 0);

      strcpy(path, windir);
      strncat(path, "\\system32\\config\\sam", MAX_PATHNAME_LEN - strlen(path) - 1);
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, path, 0);

      strcpy(path, windir);
      strncat(path, "\\system32\\config\\security", MAX_PATHNAME_LEN - strlen(path) - 1);
      NativeRegLoadKey(HKEY_LOCAL_MACHINE, path, 0);

      /* this key is generated when the nt-core booted successfully */
      if (!RegCreateKeyA(HKEY_LOCAL_MACHINE,"System\\Clone",&hkey))
        RegCloseKey(hkey);
      break;
  } /* switch */
  
  if (PROFILE_GetWineIniBool ("registry","LoadGlobalRegistryFiles", 1))
  {
      /* 
       * Load the global HKU hive directly from sysconfdir
       */ 
      _wine_loadreg( HKEY_USERS, SAVE_USERS_DEFAULT );

      /* 
       * Load the global machine defaults directly form sysconfdir
       */
      _wine_loadreg( HKEY_LOCAL_MACHINE, SAVE_LOCAL_MACHINE_DEFAULT );
  }

  SetLoadLevel(1);

  /*
   * Load the user saved registries 
   */
  if (!(home = getenv( "HOME" )))
      WARN("Failed to get homedirectory of UID %ld.\n",(long) getuid());
  else if (PROFILE_GetWineIniBool("registry", "LoadHomeRegistryFiles", 1))
  {
      /* 
       * Load user's personal versions of global HKU/.Default keys
       */
      fn=(char*)xmalloc( strlen(home)+ strlen(WINE_PREFIX) +
                         strlen(SAVE_LOCAL_USERS_DEFAULT)+2);
      strcpy(fn, home);
      strcat(fn, WINE_PREFIX"/"SAVE_LOCAL_USERS_DEFAULT);
      _wine_loadreg( HKEY_USERS, fn ); 
      free(fn);

      fn=(char*)xmalloc( strlen(home) + strlen(WINE_PREFIX) + strlen(SAVE_CURRENT_USER)+2);
      strcpy(fn, home);
      strcat(fn, WINE_PREFIX"/"SAVE_CURRENT_USER);
      _wine_loadreg( HKEY_CURRENT_USER, fn );
      free(fn);

      /* 
       * Load HKLM, attempt to get the registry location from the config 
       * file first, if exist, load and keep going.
       */
      fn=(char*)xmalloc( strlen(home)+ strlen(WINE_PREFIX)+ strlen(SAVE_LOCAL_MACHINE)+2);
      strcpy(fn,home);
      strcat(fn,WINE_PREFIX"/"SAVE_LOCAL_MACHINE);
      _wine_loadreg( HKEY_LOCAL_MACHINE, fn );
      free(fn);
  }
  
  /* 
   * Load HKCU, get the registry location from the config 
   * file, if exist, load and keep going.
   */      
  if (PROFILE_GetWineIniBool ( "registry", "LoadAltRegistryFiles", 1))
  {
      fn = xmalloc( MAX_PATHNAME_LEN ); 
      if ( PROFILE_GetWineIniString( "registry", "AltCurrentUserFile", "", 
                                     fn, MAX_PATHNAME_LEN - 1)) 
       {
         _wine_loadreg( HKEY_CURRENT_USER, fn );
       }
      free (fn);
      /*
       * Load HKU, get the registry location from the config
       * file, if exist, load and keep going.
       */
      fn = xmalloc ( MAX_PATHNAME_LEN );
      if ( PROFILE_GetWineIniString ( "registry", "AltUserFile", "",
                                      fn, MAX_PATHNAME_LEN - 1))
       {
         _wine_loadreg( HKEY_USERS, fn );
       }
      free (fn);
      /*
       * Load HKLM, get the registry location from the config
       * file, if exist, load and keep going.
       */
      fn = xmalloc ( MAX_PATHNAME_LEN );
      if (PROFILE_GetWineIniString ( "registry", "AltLocalMachineFile", "",
                                     fn, MAX_PATHNAME_LEN - 1))
       {
         _wine_loadreg( HKEY_LOCAL_MACHINE, fn );
       }
      free (fn);
  }
  
  /* 
   * Make sure the update mode is there
   */
  if (ERROR_SUCCESS==RegCreateKey16(HKEY_CURRENT_USER,KEY_REGISTRY,&hkey)) 
  {
    DWORD       junk,type,len;
    char        data[5];

    len=4;
    if ((       RegQueryValueExA(
            hkey,
            VAL_SAVEUPDATED,
            &junk,
            &type,
            data,
            &len) != ERROR_SUCCESS) || (type != REG_SZ))
    {
      RegSetValueExA(hkey,VAL_SAVEUPDATED,0,REG_SZ,"yes",4);
    }

    RegCloseKey(hkey);
  }

  if ((save_timeout = PROFILE_GetWineIniInt( "registry", "PeriodicSave", 0 )))
  {
      SERVICE_AddTimer( save_timeout * 1000000, periodic_save, 0 );
  }
}


/********************* API FUNCTIONS ***************************************/




/******************************************************************************
 * RegFlushKey [KERNEL.227] [ADVAPI32.143]
 * Immediately writes key to registry.
 * Only returns after data has been written to disk.
 *
 * FIXME: does it really wait until data is written ?
 *
 * PARAMS
 *    hkey [I] Handle of key to write
 *
 * RETURNS
 *    Success: ERROR_SUCCESS
 *    Failure: Error code
 */
DWORD WINAPI RegFlushKey( HKEY hkey )
{
    FIXME( "(%x): stub\n", hkey );
    return ERROR_SUCCESS;
}

/******************************************************************************
 * RegConnectRegistry32W [ADVAPI32.128]
 *
 * PARAMS
 *    lpMachineName [I] Address of name of remote computer
 *    hHey          [I] Predefined registry handle
 *    phkResult     [I] Address of buffer for remote registry handle
 */
LONG WINAPI RegConnectRegistryW( LPCWSTR lpMachineName, HKEY hKey, 
                                   LPHKEY phkResult )
{
    TRACE("(%s,%x,%p): stub\n",debugstr_w(lpMachineName),hKey,phkResult);

    if (!lpMachineName || !*lpMachineName) {
        /* Use the local machine name */
        return RegOpenKey16( hKey, "", phkResult );
    }

    FIXME("Cannot connect to %s\n",debugstr_w(lpMachineName));
    return ERROR_BAD_NETPATH;
}


/******************************************************************************
 * RegConnectRegistry32A [ADVAPI32.127]
 */
LONG WINAPI RegConnectRegistryA( LPCSTR machine, HKEY hkey, LPHKEY reskey )
{
    DWORD ret;
    LPWSTR machineW = strdupA2W(machine);
    ret = RegConnectRegistryW( machineW, hkey, reskey );
    free(machineW);
    return ret;
}


/******************************************************************************
 * RegGetKeySecurity [ADVAPI32.144]
 * Retrieves a copy of security descriptor protecting the registry key
 *
 * PARAMS
 *    hkey                   [I]   Open handle of key to set
 *    SecurityInformation    [I]   Descriptor contents
 *    pSecurityDescriptor    [O]   Address of descriptor for key
 *    lpcbSecurityDescriptor [I/O] Address of size of buffer and description
 *
 * RETURNS
 *    Success: ERROR_SUCCESS
 *    Failure: Error code
 */
LONG WINAPI RegGetKeySecurity( HKEY hkey, 
                               SECURITY_INFORMATION SecurityInformation,
                               PSECURITY_DESCRIPTOR pSecurityDescriptor,
                               LPDWORD lpcbSecurityDescriptor )
{
    TRACE("(%x,%ld,%p,%ld)\n",hkey,SecurityInformation,pSecurityDescriptor,
          lpcbSecurityDescriptor?*lpcbSecurityDescriptor:0);

    /* FIXME: Check for valid SecurityInformation values */

    if (*lpcbSecurityDescriptor < sizeof(SECURITY_DESCRIPTOR))
        return ERROR_INSUFFICIENT_BUFFER;

    FIXME("(%x,%ld,%p,%ld): stub\n",hkey,SecurityInformation,
          pSecurityDescriptor,lpcbSecurityDescriptor?*lpcbSecurityDescriptor:0);

    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegNotifyChangeKeyValue [ADVAPI32.???]
 *
 * PARAMS
 *    hkey            [I] Handle of key to watch
 *    fWatchSubTree   [I] Flag for subkey notification
 *    fdwNotifyFilter [I] Changes to be reported
 *    hEvent          [I] Handle of signaled event
 *    fAsync          [I] Flag for asynchronous reporting
 */
LONG WINAPI RegNotifyChangeKeyValue( HKEY hkey, BOOL fWatchSubTree, 
                                     DWORD fdwNotifyFilter, HANDLE hEvent,
                                     BOOL fAsync )
{
    FIXME("(%x,%i,%ld,%x,%i): stub\n",hkey,fWatchSubTree,fdwNotifyFilter,
          hEvent,fAsync);
    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegUnLoadKey32W [ADVAPI32.173]
 *
 * PARAMS
 *    hkey     [I] Handle of open key
 *    lpSubKey [I] Address of name of subkey to unload
 */
LONG WINAPI RegUnLoadKeyW( HKEY hkey, LPCWSTR lpSubKey )
{
    FIXME("(%x,%s): stub\n",hkey, debugstr_w(lpSubKey));
    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegUnLoadKey32A [ADVAPI32.172]
 */
LONG WINAPI RegUnLoadKeyA( HKEY hkey, LPCSTR lpSubKey )
{
    LONG ret;
    LPWSTR lpSubKeyW = strdupA2W(lpSubKey);
    ret = RegUnLoadKeyW( hkey, lpSubKeyW );
    if(lpSubKeyW) free(lpSubKeyW);
    return ret;
}


/******************************************************************************
 * RegSetKeySecurity [ADVAPI32.167]
 *
 * PARAMS
 *    hkey          [I] Open handle of key to set
 *    SecurityInfo  [I] Descriptor contents
 *    pSecurityDesc [I] Address of descriptor for key
 */
LONG WINAPI RegSetKeySecurity( HKEY hkey, SECURITY_INFORMATION SecurityInfo,
                               PSECURITY_DESCRIPTOR pSecurityDesc )
{
    TRACE("(%x,%ld,%p)\n",hkey,SecurityInfo,pSecurityDesc);

    /* It seems to perform this check before the hkey check */
    if ((SecurityInfo & OWNER_SECURITY_INFORMATION) ||
        (SecurityInfo & GROUP_SECURITY_INFORMATION) ||
        (SecurityInfo & DACL_SECURITY_INFORMATION) ||
        (SecurityInfo & SACL_SECURITY_INFORMATION)) {
        /* Param OK */
    } else
        return ERROR_INVALID_PARAMETER;

    if (!pSecurityDesc)
        return ERROR_INVALID_PARAMETER;

    FIXME(":(%x,%ld,%p): stub\n",hkey,SecurityInfo,pSecurityDesc);

    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegRestoreKey32W [ADVAPI32.164]
 *
 * PARAMS
 *    hkey    [I] Handle of key where restore begins
 *    lpFile  [I] Address of filename containing saved tree
 *    dwFlags [I] Optional flags
 */
LONG WINAPI RegRestoreKeyW( HKEY hkey, LPCWSTR lpFile, DWORD dwFlags )
{
    TRACE("(%x,%s,%ld)\n",hkey,debugstr_w(lpFile),dwFlags);

    /* It seems to do this check before the hkey check */
    if (!lpFile || !*lpFile)
        return ERROR_INVALID_PARAMETER;

    FIXME("(%x,%s,%ld): stub\n",hkey,debugstr_w(lpFile),dwFlags);

    /* Check for file existence */

    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegRestoreKey32A [ADVAPI32.163]
 */
LONG WINAPI RegRestoreKeyA( HKEY hkey, LPCSTR lpFile, DWORD dwFlags )
{
    LONG ret;
    LPWSTR lpFileW = strdupA2W(lpFile);
    ret = RegRestoreKeyW( hkey, lpFileW, dwFlags );
    if(lpFileW) free(lpFileW);
    return ret;
}


/******************************************************************************
 * RegReplaceKey32W [ADVAPI32.162]
 *
 * PARAMS
 *    hkey      [I] Handle of open key
 *    lpSubKey  [I] Address of name of subkey
 *    lpNewFile [I] Address of filename for file with new data
 *    lpOldFile [I] Address of filename for backup file
 */
LONG WINAPI RegReplaceKeyW( HKEY hkey, LPCWSTR lpSubKey, LPCWSTR lpNewFile,
                              LPCWSTR lpOldFile )
{
    FIXME("(%x,%s,%s,%s): stub\n", hkey, debugstr_w(lpSubKey), 
          debugstr_w(lpNewFile),debugstr_w(lpOldFile));
    return ERROR_SUCCESS;
}


/******************************************************************************
 * RegReplaceKey32A [ADVAPI32.161]
 */
LONG WINAPI RegReplaceKeyA( HKEY hkey, LPCSTR lpSubKey, LPCSTR lpNewFile,
                              LPCSTR lpOldFile )
{
    LONG ret;
    LPWSTR lpSubKeyW = strdupA2W(lpSubKey);
    LPWSTR lpNewFileW = strdupA2W(lpNewFile);
    LPWSTR lpOldFileW = strdupA2W(lpOldFile);
    ret = RegReplaceKeyW( hkey, lpSubKeyW, lpNewFileW, lpOldFileW );
    free(lpOldFileW);
    free(lpNewFileW);
    free(lpSubKeyW);
    return ret;
}






/* 16-bit functions */

/* 0 and 1 are valid rootkeys in win16 shell.dll and are used by
 * some programs. Do not remove those cases. -MM
 */
static inline void fix_win16_hkey( HKEY *hkey )
{
    if (*hkey == 0 || *hkey == 1) *hkey = HKEY_CLASSES_ROOT;
}

/******************************************************************************
 *           RegEnumKey16   [KERNEL.216] [SHELL.7]
 */
DWORD WINAPI RegEnumKey16( HKEY hkey, DWORD index, LPSTR name, DWORD name_len )
{
    fix_win16_hkey( &hkey );
    return RegEnumKeyA( hkey, index, name, name_len );
}

/******************************************************************************
 *           RegOpenKey16   [KERNEL.217] [SHELL.1]
 */
DWORD WINAPI RegOpenKey16( HKEY hkey, LPCSTR name, LPHKEY retkey )
{
    fix_win16_hkey( &hkey );
    return RegOpenKeyA( hkey, name, retkey );
}

/******************************************************************************
 *           RegCreateKey16   [KERNEL.218] [SHELL.2]
 */
DWORD WINAPI RegCreateKey16( HKEY hkey, LPCSTR name, LPHKEY retkey )
{
    fix_win16_hkey( &hkey );
    return RegCreateKeyA( hkey, name, retkey );
}

/******************************************************************************
 *           RegDeleteKey16   [KERNEL.219] [SHELL.4]
 */
DWORD WINAPI RegDeleteKey16( HKEY hkey, LPCSTR name )
{
    fix_win16_hkey( &hkey );
    return RegDeleteKeyA( hkey, name );
}

/******************************************************************************
 *           RegCloseKey16   [KERNEL.220] [SHELL.3]
 */
DWORD WINAPI RegCloseKey16( HKEY hkey )
{
    fix_win16_hkey( &hkey );
    return RegCloseKey( hkey );
}

/******************************************************************************
 *           RegSetValue16   [KERNEL.221] [SHELL.5]
 */
DWORD WINAPI RegSetValue16( HKEY hkey, LPCSTR name, DWORD type, LPCSTR data, DWORD count )
{
    fix_win16_hkey( &hkey );
    return RegSetValueA( hkey, name, type, data, count );
}

/******************************************************************************
 *           RegDeleteValue16  [KERNEL.222]
 */
DWORD WINAPI RegDeleteValue16( HKEY hkey, LPSTR name )
{
    fix_win16_hkey( &hkey );
    return RegDeleteValueA( hkey, name );
}

/******************************************************************************
 *           RegEnumValue16   [KERNEL.223]
 */
DWORD WINAPI RegEnumValue16( HKEY hkey, DWORD index, LPSTR value, LPDWORD val_count,
                             LPDWORD reserved, LPDWORD type, LPBYTE data, LPDWORD count )
{
    fix_win16_hkey( &hkey );
    return RegEnumValueA( hkey, index, value, val_count, reserved, type, data, count );
}

/******************************************************************************
 *           RegQueryValue16   [KERNEL.224] [SHELL.6]
 *
 * NOTES
 *    Is this HACK still applicable?
 *
 * HACK
 *    The 16bit RegQueryValue doesn't handle selectorblocks anyway, so we just
 *    mask out the high 16 bit.  This (not so much incidently) hopefully fixes
 *    Aldus FH4)
 */
DWORD WINAPI RegQueryValue16( HKEY hkey, LPCSTR name, LPSTR data, LPDWORD count )
{
    fix_win16_hkey( &hkey );
    if (count) *count &= 0xffff;
    return RegQueryValueA( hkey, name, data, count );
}

/******************************************************************************
 *           RegQueryValueEx16   [KERNEL.225]
 */
DWORD WINAPI RegQueryValueEx16( HKEY hkey, LPCSTR name, LPDWORD reserved, LPDWORD type,
                                LPBYTE data, LPDWORD count )
{
    fix_win16_hkey( &hkey );
    return RegQueryValueExA( hkey, name, reserved, type, data, count );
}

/******************************************************************************
 *           RegSetValueEx16   [KERNEL.226]
 */
DWORD WINAPI RegSetValueEx16( HKEY hkey, LPCSTR name, DWORD reserved, DWORD type,
                              CONST BYTE *data, DWORD count )
{
    fix_win16_hkey( &hkey );
    return RegSetValueExA( hkey, name, reserved, type, data, count );
}