/*
 * 				Shell Library Functions
 *
 *  1998 Marcus Meissner
 */
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "wine/winuser16.h"
#include "wine/winbase16.h"
#include "wine/shell16.h"
#include "winerror.h"
#include "file.h"
#include "heap.h"
#include "ldt.h"
#include "module.h"
#include "neexe.h"
#include "dlgs.h"
#include "cursoricon.h"
#include "shellapi.h"
#include "shlobj.h"
#include "debugtools.h"
#include "winreg.h"
#include "syslevel.h"
#include "imagelist.h"

DEFAULT_DEBUG_CHANNEL(shell)
DECLARE_DEBUG_CHANNEL(exec)

/* .ICO file ICONDIR definitions */

#include "pshpack1.h"

typedef struct
{
    BYTE        bWidth;          /* Width, in pixels, of the image	*/
    BYTE        bHeight;         /* Height, in pixels, of the image	*/
    BYTE        bColorCount;     /* Number of colors in image (0 if >=8bpp) */
    BYTE        bReserved;       /* Reserved ( must be 0)		*/
    WORD        wPlanes;         /* Color Planes			*/
    WORD        wBitCount;       /* Bits per pixel			*/
    DWORD       dwBytesInRes;    /* How many bytes in this resource?	*/
    DWORD       dwImageOffset;   /* Where in the file is this image?	*/
} icoICONDIRENTRY, *LPicoICONDIRENTRY;

typedef struct
{
    WORD            idReserved;   /* Reserved (must be 0)		*/
    WORD            idType;       /* Resource Type (1 for icons)	*/
    WORD            idCount;      /* How many images?			*/
    icoICONDIRENTRY idEntries[1]; /* An entry for each image (idCount of 'em) */
} icoICONDIR, *LPicoICONDIR;

#include "poppack.h"

static const char*	lpstrMsgWndCreated = "OTHERWINDOWCREATED";
static const char*	lpstrMsgWndDestroyed = "OTHERWINDOWDESTROYED";
static const char*	lpstrMsgShellActivate = "ACTIVATESHELLWINDOW";

static HWND16	SHELL_hWnd = 0;
static HHOOK	SHELL_hHook = 0;
static UINT16	uMsgWndCreated = 0;
static UINT16	uMsgWndDestroyed = 0;
static UINT16	uMsgShellActivate = 0;
HINSTANCE16	SHELL_hInstance = 0;
HINSTANCE SHELL_hInstance32;
static int SHELL_Attach = 0;

/***********************************************************************
 * SHELL_DllEntryPoint [SHELL.entry]
 *
 * Initialization code for shell.dll. Automatically loads the
 * 32-bit shell32.dll to allow thunking up to 32-bit code.
 *
 * RETURNS:
 */
BOOL WINAPI SHELL_DllEntryPoint(DWORD Reason, HINSTANCE16 hInst,
				WORD ds, WORD HeapSize, DWORD res1, WORD res2)
{
    TRACE("(%08lx, %04x, %04x, %04x, %08lx, %04x)\n",
          Reason, hInst, ds, HeapSize, res1, res2);

    switch(Reason)
    {
    case DLL_PROCESS_ATTACH:
	SHELL_Attach++;
	if (SHELL_hInstance)
	{
	    ERR("shell.dll instantiated twice!\n");
	    /*
	     * We should return FALSE here, but that will break
	     * most apps that use CreateProcess because we do
	     * not yet support seperate address-spaces.
	     */
	    return TRUE;
	}

	SHELL_hInstance = hInst;
	if(!SHELL_hInstance32)
	{
	    if(!(SHELL_hInstance32 = LoadLibraryA("shell32.dll")))
	    {
		ERR("Could not load sibling shell32.dll\n");
		return FALSE;
	    }
	}
	break;

    case DLL_PROCESS_DETACH:
	if(!--SHELL_Attach)
	{
	    SHELL_hInstance = 0;
	    if(SHELL_hInstance32)
		FreeLibrary(SHELL_hInstance32);
	}
	break;
    }
    return TRUE;
}

/*************************************************************************
 *				DragAcceptFiles32		[SHELL32.54]
 */
void WINAPI DragAcceptFiles(HWND hWnd, BOOL b)
{
  LONG exstyle;
  
  
  if( !IsWindow(hWnd) )
  	return;
  exstyle = GetWindowLongA(hWnd,GWL_EXSTYLE);
  if (b)exstyle |= WS_EX_ACCEPTFILES;
  else	exstyle &= ~WS_EX_ACCEPTFILES;
  SetWindowLongA(hWnd,GWL_EXSTYLE,exstyle);
}

/*************************************************************************
 *				DragAcceptFiles16		[SHELL.9]
 */
void WINAPI DragAcceptFiles16(HWND16 hWnd, BOOL16 b)
{
  DragAcceptFiles(hWnd, b);
}

/*************************************************************************
 *				SHELL_DragQueryFile	[internal]
 * 
 */
static UINT SHELL_DragQueryFile(LPSTR lpDrop, LPWSTR lpwDrop, UINT lFile, 
				  LPSTR lpszFile, LPWSTR lpszwFile, UINT lLength)
{
    UINT i;

    i = 0;
    if (lpDrop) {
    while (i++ < lFile) {
	while (*lpDrop++); /* skip filename */
	if (!*lpDrop) 
	  return (lFile == 0xFFFFFFFF) ? i : 0;  
      }
    }
    if (lpwDrop) {
      while (i++ < lFile) {
	while (*lpwDrop++); /* skip filename */
	if (!*lpwDrop) 
	  return (lFile == 0xFFFFFFFF) ? i : 0;  
      }
    }
    
    if (lpDrop)  i = lstrlenA(lpDrop);
    if (lpwDrop) i = lstrlenW(lpwDrop);
    i++;
    if (!lpszFile && !lpszwFile) {
      return i;   /* needed buffer size */
    }
    i = (lLength > i) ? i : lLength;
    if (lpszFile) {
      if (lpDrop) lstrcpynA (lpszFile,  lpDrop,  i);
      else        lstrcpynWtoA(lpszFile,  lpwDrop, i);
    } else {
      if (lpDrop) lstrcpynAtoW(lpszwFile, lpDrop,  i);
      else        lstrcpynW (lpszwFile, lpwDrop, i);
    }
    return i;
}

/*************************************************************************
 *				DragQueryFile32A	[SHELL32.81] [shell32.82]
 */
UINT WINAPI DragQueryFileA(HDROP hDrop, UINT lFile, LPSTR lpszFile,
			      UINT lLength)
{ /* hDrop is a global memory block allocated with GMEM_SHARE 
     * with DROPFILESTRUCT as a header and filenames following
     * it, zero length filename is in the end */       
    
    LPDROPFILESTRUCT lpDropFileStruct;
    LPSTR lpCurrent;
    UINT i;
    
    TRACE("(%08x, %x, %p, %u)\n",	hDrop,lFile,lpszFile,lLength);
    
    lpDropFileStruct = (LPDROPFILESTRUCT) GlobalLock(hDrop); 
    if(!lpDropFileStruct)
      return 0;

    lpCurrent = (LPSTR) lpDropFileStruct + lpDropFileStruct->lSize;
    i = SHELL_DragQueryFile(lpCurrent, NULL, lFile, lpszFile, NULL, lLength);
    GlobalUnlock(hDrop);
    return i;
}

/*************************************************************************
 *				DragQueryFile32W	[shell32.133]
 */
UINT WINAPI DragQueryFileW(HDROP hDrop, UINT lFile, LPWSTR lpszwFile,
			      UINT lLength)
{
    LPDROPFILESTRUCT lpDropFileStruct;
    LPWSTR lpwCurrent;
    UINT i;
    
    TRACE("(%08x, %x, %p, %u)\n",	hDrop,lFile,lpszwFile,lLength);
    
    lpDropFileStruct = (LPDROPFILESTRUCT) GlobalLock(hDrop); 
    if(!lpDropFileStruct)
      return 0;

    lpwCurrent = (LPWSTR) lpDropFileStruct + lpDropFileStruct->lSize;
    i = SHELL_DragQueryFile(NULL, lpwCurrent, lFile, NULL, lpszwFile,lLength);
    GlobalUnlock(hDrop);
    return i;
}
/*************************************************************************
 *				DragQueryFile16		[SHELL.11]
 */
UINT16 WINAPI DragQueryFile16(HDROP16 hDrop, WORD wFile, LPSTR lpszFile,
                            WORD wLength)
{ /* hDrop is a global memory block allocated with GMEM_SHARE 
     * with DROPFILESTRUCT as a header and filenames following
     * it, zero length filename is in the end */       
    
    LPDROPFILESTRUCT16 lpDropFileStruct;
    LPSTR lpCurrent;
    WORD  i;
    
    TRACE("(%04x, %x, %p, %u)\n", hDrop,wFile,lpszFile,wLength);
    
    lpDropFileStruct = (LPDROPFILESTRUCT16) GlobalLock16(hDrop); 
    if(!lpDropFileStruct)
      return 0;
    
    lpCurrent = (LPSTR) lpDropFileStruct + lpDropFileStruct->wSize;

    i = (WORD)SHELL_DragQueryFile(lpCurrent, NULL, wFile==0xffff?0xffffffff:wFile,
				  lpszFile, NULL, wLength);
    GlobalUnlock16(hDrop);
    return i;
}


/*************************************************************************
 *				DragFinish32		[SHELL32.80]
 */
void WINAPI DragFinish(HDROP h)
{
    TRACE("\n");
    GlobalFree((HGLOBAL)h);
}

/*************************************************************************
 *				DragFinish16		[SHELL.12]
 */
void WINAPI DragFinish16(HDROP16 h)
{
    TRACE("\n");
    GlobalFree16((HGLOBAL16)h);
}


/*************************************************************************
 *				DragQueryPoint32		[SHELL32.135]
 */
BOOL WINAPI DragQueryPoint(HDROP hDrop, POINT *p)
{
  LPDROPFILESTRUCT lpDropFileStruct;  
  BOOL             bRet;
  TRACE("\n");
  lpDropFileStruct = (LPDROPFILESTRUCT) GlobalLock(hDrop);
  
  memcpy(p,&lpDropFileStruct->ptMousePos,sizeof(POINT));
  bRet = lpDropFileStruct->fInNonClientArea;
  
  GlobalUnlock(hDrop);
  return bRet;
}

/*************************************************************************
 *				DragQueryPoint16		[SHELL.13]
 */
BOOL16 WINAPI DragQueryPoint16(HDROP16 hDrop, POINT16 *p)
{
  LPDROPFILESTRUCT16 lpDropFileStruct;  
  BOOL16           bRet;
  TRACE("\n");
  lpDropFileStruct = (LPDROPFILESTRUCT16) GlobalLock16(hDrop);
  
  memcpy(p,&lpDropFileStruct->ptMousePos,sizeof(POINT16));
  bRet = lpDropFileStruct->fInNonClientArea;
  
  GlobalUnlock16(hDrop);
  return bRet;
}

/*************************************************************************
 *	SHELL_FindExecutable [Internal]
 *
 * Utility for code sharing between FindExecutable and ShellExecute
 */
HINSTANCE SHELL_FindExecutable( LPCSTR lpFile, 
                                         LPCSTR lpOperation,
                                         LPSTR lpResult)
{ char *extension = NULL; /* pointer to file extension */
    char tmpext[5];         /* local copy to mung as we please */
    char filetype[256];     /* registry name for this filetype */
    LONG filetypelen=256;   /* length of above */
    char command[256];      /* command from registry */
    LONG commandlen=256;    /* This is the most DOS can handle :) */
    char buffer[256];       /* Used to GetProfileString */
    HINSTANCE retval=31;  /* default - 'No association was found' */
    char *tok;              /* token pointer */
    int i;                  /* random counter */
    char xlpFile[256];      /* result of SearchPath */

  TRACE("%s\n", (lpFile != NULL?lpFile:"-") );

    lpResult[0]='\0'; /* Start off with an empty return string */

    /* trap NULL parameters on entry */
    if (( lpFile == NULL ) || ( lpResult == NULL ) || ( lpOperation == NULL ))
  { WARN_(exec)("(lpFile=%s,lpResult=%s,lpOperation=%s): NULL parameter\n",
           lpFile, lpOperation, lpResult);
        return 2; /* File not found. Close enough, I guess. */
    }

    if (SearchPathA( NULL, lpFile,".exe",sizeof(xlpFile),xlpFile,NULL))
  { TRACE("SearchPath32A returned non-zero\n");
        lpFile = xlpFile;
    }

    /* First thing we need is the file's extension */
    extension = strrchr( xlpFile, '.' ); /* Assume last "." is the one; */
					/* File->Run in progman uses */
					/* .\FILE.EXE :( */
  TRACE("xlpFile=%s,extension=%s\n", xlpFile, extension);

    if ((extension == NULL) || (extension == &xlpFile[strlen(xlpFile)]))
  { WARN("Returning 31 - No association\n");
        return 31; /* no association */
    }

    /* Make local copy & lowercase it for reg & 'programs=' lookup */
    lstrcpynA( tmpext, extension, 5 );
    CharLowerA( tmpext );
  TRACE("%s file\n", tmpext);
    
    /* Three places to check: */
    /* 1. win.ini, [windows], programs (NB no leading '.') */
    /* 2. Registry, HKEY_CLASS_ROOT\<filetype>\shell\open\command */
    /* 3. win.ini, [extensions], extension (NB no leading '.' */
    /* All I know of the order is that registry is checked before */
    /* extensions; however, it'd make sense to check the programs */
    /* section first, so that's what happens here. */

    /* See if it's a program - if GetProfileString fails, we skip this
     * section. Actually, if GetProfileString fails, we've probably
     * got a lot more to worry about than running a program... */
    if ( GetProfileStringA("windows", "programs", "exe pif bat com",
						  buffer, sizeof(buffer)) > 0 )
  { for (i=0;i<strlen(buffer); i++) buffer[i]=tolower(buffer[i]);

		tok = strtok(buffer, " \t"); /* ? */
		while( tok!= NULL)
		  {
			if (strcmp(tok, &tmpext[1])==0) /* have to skip the leading "." */
			  {
				strcpy(lpResult, xlpFile);
				/* Need to perhaps check that the file has a path
				 * attached */
        TRACE("found %s\n", lpResult);
        return 33;

		/* Greater than 32 to indicate success FIXME According to the
		 * docs, I should be returning a handle for the
		 * executable. Does this mean I'm supposed to open the
		 * executable file or something? More RTFM, I guess... */
			  }
			tok=strtok(NULL, " \t");
		  }
	  }

    /* Check registry */
    if (RegQueryValue16( HKEY_CLASSES_ROOT, tmpext, filetype,
                         &filetypelen ) == ERROR_SUCCESS )
    {
	filetype[filetypelen]='\0';
  TRACE("File type: %s\n", filetype);

	/* Looking for ...buffer\shell\lpOperation\command */
	strcat( filetype, "\\shell\\" );
	strcat( filetype, lpOperation );
	strcat( filetype, "\\command" );
	
	if (RegQueryValue16( HKEY_CLASSES_ROOT, filetype, command,
                             &commandlen ) == ERROR_SUCCESS )
	{
	    /* Is there a replace() function anywhere? */
	    command[commandlen]='\0';
	    strcpy( lpResult, command );
	    tok=strstr( lpResult, "%1" );
	    if (tok != NULL)
	    {
		tok[0]='\0'; /* truncate string at the percent */
		strcat( lpResult, xlpFile ); /* what if no dir in xlpFile? */
		tok=strstr( command, "%1" );
		if ((tok!=NULL) && (strlen(tok)>2))
		{
		    strcat( lpResult, &tok[2] );
		}
	    }
	    retval=33; /* FIXME see above */
	}
    }
    else /* Check win.ini */
    {
	/* Toss the leading dot */
	extension++;
	if ( GetProfileStringA( "extensions", extension, "", command,
                                  sizeof(command)) > 0)
	  {
		if (strlen(command)!=0)
		  {
			strcpy( lpResult, command );
			tok=strstr( lpResult, "^" ); /* should be ^.extension? */
			if (tok != NULL)
			  {
				tok[0]='\0';
				strcat( lpResult, xlpFile ); /* what if no dir in xlpFile? */
				tok=strstr( command, "^" ); /* see above */
				if ((tok != NULL) && (strlen(tok)>5))
				  {
					strcat( lpResult, &tok[5]);
				  }
			  }
			retval=33; /* FIXME - see above */
		  }
	  }
	}

    TRACE("returning %s\n", lpResult);
    return retval;
}

/*************************************************************************
 *				ShellExecute16		[SHELL.20]
 */
HINSTANCE16 WINAPI ShellExecute16( HWND16 hWnd, LPCSTR lpOperation,
                                   LPCSTR lpFile, LPCSTR lpParameters,
                                   LPCSTR lpDirectory, INT16 iShowCmd )
{   HINSTANCE16 retval=31;
    char old_dir[1024];
    char cmd[256];

    TRACE("(%04x,'%s','%s','%s','%s',%x)\n",
		hWnd, lpOperation ? lpOperation:"<null>", lpFile ? lpFile:"<null>",
		lpParameters ? lpParameters : "<null>", 
		lpDirectory ? lpDirectory : "<null>", iShowCmd);

    if (lpFile==NULL) return 0; /* should not happen */
    if (lpOperation==NULL) /* default is open */
      lpOperation="open";

    if (lpDirectory)
    { GetCurrentDirectoryA( sizeof(old_dir), old_dir );
        SetCurrentDirectoryA( lpDirectory );
    }

    retval = SHELL_FindExecutable( lpFile, lpOperation, cmd );

    if (retval > 32)  /* Found */
    {
        if (lpParameters)
        {
            strcat(cmd," ");
            strcat(cmd,lpParameters);
        }

        TRACE("starting %s\n",cmd);
        SYSLEVEL_ReleaseWin16Lock();
        retval = WinExec( cmd, iShowCmd );
        SYSLEVEL_RestoreWin16Lock();
    }
    if (lpDirectory)
      SetCurrentDirectoryA( old_dir );
    return retval;
}

/*************************************************************************
 *             FindExecutable16   (SHELL.21)
 */
HINSTANCE16 WINAPI FindExecutable16( LPCSTR lpFile, LPCSTR lpDirectory,
                                     LPSTR lpResult )
{ return (HINSTANCE16)FindExecutableA( lpFile, lpDirectory, lpResult );
}


/*************************************************************************
 *             AboutDlgProc16   (SHELL.33)
 */
BOOL16 WINAPI AboutDlgProc16( HWND16 hWnd, UINT16 msg, WPARAM16 wParam,
                               LPARAM lParam )
{ return AboutDlgProc( hWnd, msg, wParam, lParam );
}


/*************************************************************************
 *             ShellAbout16   (SHELL.22)
 */
BOOL16 WINAPI ShellAbout16( HWND16 hWnd, LPCSTR szApp, LPCSTR szOtherStuff,
                            HICON16 hIcon )
{ return ShellAboutA( hWnd, szApp, szOtherStuff, hIcon );
}

/*************************************************************************
 *				SHELL_GetResourceTable
 */
static DWORD SHELL_GetResourceTable(HFILE hFile,LPBYTE *retptr)
{	IMAGE_DOS_HEADER	mz_header;
	char			magic[4];
	int			size;

	TRACE("\n");  

	*retptr = NULL;
	_llseek( hFile, 0, SEEK_SET );
	if ((_lread(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) || (mz_header.e_magic != IMAGE_DOS_SIGNATURE))
	{ /* .ICO file ? */
          if (mz_header.e_cblp == 1) 
	  { /* ICONHEADER.idType, must be 1 */
	    *retptr = (LPBYTE)-1;
  	    return 1;
	  }
	  else
	    return 0; /* failed */
	}
	_llseek( hFile, mz_header.e_lfanew, SEEK_SET );

	if (_lread( hFile, magic, sizeof(magic) ) != sizeof(magic))
	  return 0;

	_llseek( hFile, mz_header.e_lfanew, SEEK_SET);

	if (*(DWORD*)magic  == IMAGE_NT_SIGNATURE)
	  return IMAGE_NT_SIGNATURE;

	if (*(WORD*)magic == IMAGE_OS2_SIGNATURE)
	{ IMAGE_OS2_HEADER	ne_header;
	  LPBYTE		pTypeInfo = (LPBYTE)-1;

	  if (_lread(hFile,&ne_header,sizeof(ne_header))!=sizeof(ne_header))
	    return 0;

	  if (ne_header.ne_magic != IMAGE_OS2_SIGNATURE)
	    return 0;

	  size = ne_header.rname_tab_offset - ne_header.resource_tab_offset;

	  if( size > sizeof(NE_TYPEINFO) )
	  { pTypeInfo = (BYTE*)HeapAlloc( GetProcessHeap(), 0, size);
	    if( pTypeInfo ) 
	    { _llseek(hFile, mz_header.e_lfanew+ne_header.resource_tab_offset, SEEK_SET);
	      if( _lread( hFile, (char*)pTypeInfo, size) != size )
	      { HeapFree( GetProcessHeap(), 0, pTypeInfo); 
		pTypeInfo = NULL;
	      }
	    }
	  }
	  *retptr = pTypeInfo;
	  return IMAGE_OS2_SIGNATURE;
	}
  	return 0; /* failed */
}

/*************************************************************************
 *			SHELL_LoadResource
 */
static HGLOBAL16 SHELL_LoadResource(HINSTANCE16 hInst, HFILE hFile, NE_NAMEINFO* pNInfo, WORD sizeShift)
{	BYTE*  ptr;
	HGLOBAL16 handle = DirectResAlloc16( hInst, 0x10, (DWORD)pNInfo->length << sizeShift);

	TRACE("\n");

	if( (ptr = (BYTE*)GlobalLock16( handle )) )
	{ _llseek( hFile, (DWORD)pNInfo->offset << sizeShift, SEEK_SET);
	  _lread( hFile, (char*)ptr, pNInfo->length << sizeShift);
	  return handle;
	}
	return 0;
}

/*************************************************************************
 *                      ICO_LoadIcon
 */
static HGLOBAL16 ICO_LoadIcon(HINSTANCE16 hInst, HFILE hFile, LPicoICONDIRENTRY lpiIDE)
{	BYTE*  ptr;
	HGLOBAL16 handle = DirectResAlloc16( hInst, 0x10, lpiIDE->dwBytesInRes);
	TRACE("\n");
	if( (ptr = (BYTE*)GlobalLock16( handle )) )
	{ _llseek( hFile, lpiIDE->dwImageOffset, SEEK_SET);
	  _lread( hFile, (char*)ptr, lpiIDE->dwBytesInRes);
	  return handle;
	}
	return 0;
}

/*************************************************************************
 *                      ICO_GetIconDirectory
 *
 *  Read .ico file and build phony ICONDIR struct for GetIconID
 */
static HGLOBAL16 ICO_GetIconDirectory(HINSTANCE16 hInst, HFILE hFile, LPicoICONDIR* lplpiID ) 
{ WORD    id[3];  /* idReserved, idType, idCount */
  LPicoICONDIR	lpiID;
  int		i;
 
  TRACE("\n"); 
  _llseek( hFile, 0, SEEK_SET );
  if( _lread(hFile,(char*)id,sizeof(id)) != sizeof(id) ) return 0;

  /* check .ICO header 
   *
   * - see http://www.microsoft.com/win32dev/ui/icons.htm
   */

  if( id[0] || id[1] != 1 || !id[2] ) return 0;

  i = id[2]*sizeof(icoICONDIRENTRY) ;

  lpiID = (LPicoICONDIR)HeapAlloc( GetProcessHeap(), 0, i + sizeof(id));

  if( _lread(hFile,(char*)lpiID->idEntries,i) == i )
  { HGLOBAL16 handle = DirectResAlloc16( hInst, 0x10,
                                     id[2]*sizeof(CURSORICONDIRENTRY) + sizeof(id) );
     if( handle ) 
    { CURSORICONDIR*     lpID = (CURSORICONDIR*)GlobalLock16( handle );
       lpID->idReserved = lpiID->idReserved = id[0];
       lpID->idType = lpiID->idType = id[1];
       lpID->idCount = lpiID->idCount = id[2];
       for( i=0; i < lpiID->idCount; i++ )
      { memcpy((void*)(lpID->idEntries + i), 
		   (void*)(lpiID->idEntries + i), sizeof(CURSORICONDIRENTRY) - 2);
	    lpID->idEntries[i].wResId = i;
         }
      *lplpiID = lpiID;
       return handle;
     }
  }
  /* fail */

  HeapFree( GetProcessHeap(), 0, lpiID);
  return 0;
}

/*************************************************************************
 *			InternalExtractIcon		[SHELL.39]
 *
 * This abortion is called directly by Progman
 */
HGLOBAL16 WINAPI InternalExtractIcon16(HINSTANCE16 hInstance,
                                     LPCSTR lpszExeFileName, UINT16 nIconIndex, WORD n )
{	HGLOBAL16	hRet = 0;
	HGLOBAL16*	RetPtr = NULL;
	LPBYTE		pData;
	OFSTRUCT	ofs;
	DWORD		sig;
	HFILE		hFile = OpenFile( lpszExeFileName, &ofs, OF_READ );
	UINT16		iconDirCount = 0,iconCount = 0;
	LPBYTE		peimage;
	HANDLE	fmapping;
	
	TRACE("(%04x,file %s,start %d,extract %d\n", 
		       hInstance, lpszExeFileName, nIconIndex, n);

	if( hFile == HFILE_ERROR || !n )
	  return 0;

	hRet = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(HICON16)*n);
	RetPtr = (HICON16*)GlobalLock16(hRet);

	*RetPtr = (n == 0xFFFF)? 0: 1;	/* error return values */

	sig = SHELL_GetResourceTable(hFile,&pData);

	if( sig==IMAGE_OS2_SIGNATURE || sig==1 ) /* .ICO file */
	{ HICON16	 hIcon = 0;
	  NE_TYPEINFO* pTInfo = (NE_TYPEINFO*)(pData + 2);
	  NE_NAMEINFO* pIconStorage = NULL;
	  NE_NAMEINFO* pIconDir = NULL;
	  LPicoICONDIR lpiID = NULL;
 
	  if( pData == (BYTE*)-1 )
	  { hIcon = ICO_GetIconDirectory(hInstance, hFile, &lpiID);	/* check for .ICO file */
	    if( hIcon ) 
	    { iconDirCount = 1; iconCount = lpiID->idCount; 
	    }
	  }
	  else while( pTInfo->type_id && !(pIconStorage && pIconDir) )
	  { if( pTInfo->type_id == NE_RSCTYPE_GROUP_ICON )	/* find icon directory and icon repository */
	    { iconDirCount = pTInfo->count;
	      pIconDir = ((NE_NAMEINFO*)(pTInfo + 1));
	      TRACE("\tfound directory - %i icon families\n", iconDirCount);
	    }
	    if( pTInfo->type_id == NE_RSCTYPE_ICON ) 
	    { iconCount = pTInfo->count;
	      pIconStorage = ((NE_NAMEINFO*)(pTInfo + 1));
	      TRACE("\ttotal icons - %i\n", iconCount);
	    }
	    pTInfo = (NE_TYPEINFO *)((char*)(pTInfo+1)+pTInfo->count*sizeof(NE_NAMEINFO));
	  }

	  /* load resources and create icons */

	  if( (pIconStorage && pIconDir) || lpiID )
	  { if( nIconIndex == (UINT16)-1 )
	    { RetPtr[0] = iconDirCount;
	    }
	    else if( nIconIndex < iconDirCount )
	    { UINT16   i, icon;
	      if( n > iconDirCount - nIconIndex ) 
	        n = iconDirCount - nIconIndex;

	      for( i = nIconIndex; i < nIconIndex + n; i++ ) 
	      { /* .ICO files have only one icon directory */

	        if( lpiID == NULL )
	          hIcon = SHELL_LoadResource( hInstance, hFile, pIconDir + i, *(WORD*)pData );
	        RetPtr[i-nIconIndex] = GetIconID16( hIcon, 3 );
	        GlobalFree16(hIcon); 
              }

	      for( icon = nIconIndex; icon < nIconIndex + n; icon++ )
	      { hIcon = 0;
	        if( lpiID )
	        { hIcon = ICO_LoadIcon( hInstance, hFile, lpiID->idEntries + RetPtr[icon-nIconIndex]);
	        }
	        else
	        { for( i = 0; i < iconCount; i++ )
	          { if( pIconStorage[i].id == (RetPtr[icon-nIconIndex] | 0x8000) )
	            { hIcon = SHELL_LoadResource( hInstance, hFile, pIconStorage + i,*(WORD*)pData );
	            }
	          }
	        }
	        if( hIcon )
	        { RetPtr[icon-nIconIndex] = LoadIconHandler16( hIcon, TRUE ); 
	          FarSetOwner16( RetPtr[icon-nIconIndex], GetExePtr(hInstance) );
	        }
	        else
	        { RetPtr[icon-nIconIndex] = 0;
	        }
	      }
	    }
	  }
	  if( lpiID ) 
	    HeapFree( GetProcessHeap(), 0, lpiID);
	  else 
	    HeapFree( GetProcessHeap(), 0, pData);
	} 

	if( sig == IMAGE_NT_SIGNATURE)
	{ LPBYTE		idata,igdata;
	  PIMAGE_DOS_HEADER	dheader;
	  PIMAGE_NT_HEADERS	pe_header;
	  PIMAGE_SECTION_HEADER	pe_sections;
	  PIMAGE_RESOURCE_DIRECTORY	rootresdir,iconresdir,icongroupresdir;
	  PIMAGE_RESOURCE_DATA_ENTRY	idataent,igdataent;
	  int			i,j;
	  PIMAGE_RESOURCE_DIRECTORY_ENTRY	xresent;
	  CURSORICONDIR		**cids;
	
	  fmapping = CreateFileMappingA(hFile,NULL,PAGE_READONLY|SEC_COMMIT,0,0,NULL);
	  if (fmapping == 0) 
	  { /* FIXME, INVALID_HANDLE_VALUE? */
	    WARN("failed to create filemap.\n");
	    hRet = 0;
	    goto end_2;	/* failure */
	  }
	  peimage = MapViewOfFile(fmapping,FILE_MAP_READ,0,0,0);
	  if (!peimage) 
	  { WARN("failed to mmap filemap.\n");
	    hRet = 0;
	    goto end_2;	/* failure */
	  }
	  dheader = (PIMAGE_DOS_HEADER)peimage;

	  /* it is a pe header, SHELL_GetResourceTable checked that */
	  pe_header = (PIMAGE_NT_HEADERS)(peimage+dheader->e_lfanew);

	  /* probably makes problems with short PE headers... but I haven't seen 
	  * one yet... 
	  */
	  pe_sections = (PIMAGE_SECTION_HEADER)(((char*)pe_header)+sizeof(*pe_header));
	  rootresdir = NULL;

	  for (i=0;i<pe_header->FileHeader.NumberOfSections;i++) 
	  { if (pe_sections[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
	      continue;
	    /* FIXME: doesn't work when the resources are not in a seperate section */
	    if (pe_sections[i].VirtualAddress == pe_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress) 
	    { rootresdir = (PIMAGE_RESOURCE_DIRECTORY)((char*)peimage+pe_sections[i].PointerToRawData);
	      break;
	    }
	  }

	  if (!rootresdir) 
	  { WARN("haven't found section for resource directory.\n");
	    goto end_4;	/* failure */
	  }

	  icongroupresdir = GetResDirEntryW(rootresdir,RT_GROUP_ICONW, (DWORD)rootresdir,FALSE);

	  if (!icongroupresdir) 
	  { WARN("No Icongroupresourcedirectory!\n");
	    goto end_4;	/* failure */
	  }

	  iconDirCount = icongroupresdir->NumberOfNamedEntries+icongroupresdir->NumberOfIdEntries;

	  if( nIconIndex == (UINT16)-1 ) 
	  { RetPtr[0] = iconDirCount;
	    goto end_3;	/* success */
	  }

	  if (nIconIndex >= iconDirCount) 
	  { WARN("nIconIndex %d is larger than iconDirCount %d\n",nIconIndex,iconDirCount);
	    GlobalFree16(hRet);
	    goto end_4;	/* failure */
	  }

	  cids = (CURSORICONDIR**)HeapAlloc(GetProcessHeap(),0,n*sizeof(CURSORICONDIR*));
		
	  /* caller just wanted the number of entries */
	  xresent = (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(icongroupresdir+1);

	  /* assure we don't get too much ... */
	  if( n > iconDirCount - nIconIndex ) 
	  { n = iconDirCount - nIconIndex;
	  }

	  /* starting from specified index ... */
	  xresent = xresent+nIconIndex;

	  for (i=0;i<n;i++,xresent++) 
	  { CURSORICONDIR	*cid;
	    PIMAGE_RESOURCE_DIRECTORY	resdir;

	    /* go down this resource entry, name */
	    resdir = (PIMAGE_RESOURCE_DIRECTORY)((DWORD)rootresdir+(xresent->u2.s.OffsetToDirectory));

	    /* default language (0) */
	    resdir = GetResDirEntryW(resdir,(LPWSTR)0,(DWORD)rootresdir,TRUE);
	    igdataent = (PIMAGE_RESOURCE_DATA_ENTRY)resdir;

	    /* lookup address in mapped image for virtual address */
	    igdata = NULL;

	    for (j=0;j<pe_header->FileHeader.NumberOfSections;j++) 
	    { if (igdataent->OffsetToData < pe_sections[j].VirtualAddress)
	        continue;
	      if (igdataent->OffsetToData+igdataent->Size > pe_sections[j].VirtualAddress+pe_sections[j].SizeOfRawData)
		continue;
	      igdata = peimage+(igdataent->OffsetToData-pe_sections[j].VirtualAddress+pe_sections[j].PointerToRawData);
	    }

	    if (!igdata) 
	    { WARN("no matching real address for icongroup!\n");
	      goto end_4;	/* failure */
	    }
	    /* found */
	    cid = (CURSORICONDIR*)igdata;
	    cids[i] = cid;
	    RetPtr[i] = LookupIconIdFromDirectoryEx(igdata,TRUE,GetSystemMetrics(SM_CXICON),GetSystemMetrics(SM_CYICON),0);
	  }

	  iconresdir=GetResDirEntryW(rootresdir,RT_ICONW,(DWORD)rootresdir,FALSE);

	  if (!iconresdir) 
	  { WARN("No Iconresourcedirectory!\n");
	    goto end_4;	/* failure */
	  }

	  for (i=0;i<n;i++) 
	  { PIMAGE_RESOURCE_DIRECTORY	xresdir;
	    xresdir = GetResDirEntryW(iconresdir,(LPWSTR)(DWORD)RetPtr[i],(DWORD)rootresdir,FALSE);
	    xresdir = GetResDirEntryW(xresdir,(LPWSTR)0,(DWORD)rootresdir,TRUE);
	    idataent = (PIMAGE_RESOURCE_DATA_ENTRY)xresdir;
	    idata = NULL;

	    /* map virtual to address in image */
	    for (j=0;j<pe_header->FileHeader.NumberOfSections;j++) 
	    { if (idataent->OffsetToData < pe_sections[j].VirtualAddress)
	        continue;
	      if (idataent->OffsetToData+idataent->Size > pe_sections[j].VirtualAddress+pe_sections[j].SizeOfRawData)
	        continue;
	      idata = peimage+(idataent->OffsetToData-pe_sections[j].VirtualAddress+pe_sections[j].PointerToRawData);
	    }
	    if (!idata) 
	    { WARN("no matching real address found for icondata!\n");
	      RetPtr[i]=0;
	      continue;
	    }
	    RetPtr[i] = CreateIconFromResourceEx(idata,idataent->Size,TRUE,0x00030000,GetSystemMetrics(SM_CXICON),GetSystemMetrics(SM_CYICON),0);
	  }
	  goto end_3;	/* sucess */
	}
	goto end_1;	/* return array with icon handles */

/* cleaning up (try & catch would be nicer) */
end_4:	hRet = 0;	/* failure */
end_3:	UnmapViewOfFile(peimage);	/* success */
end_2:	CloseHandle(fmapping);
end_1:	_lclose( hFile);
	return hRet;
}

/*************************************************************************
 *             ExtractIcon16   (SHELL.34)
 */
HICON16 WINAPI ExtractIcon16( HINSTANCE16 hInstance, LPCSTR lpszExeFileName,
	UINT16 nIconIndex )
{   TRACE("\n");
    return ExtractIconA( hInstance, lpszExeFileName, nIconIndex );
}

/*************************************************************************
 *             ExtractIconEx16   (SHELL.40)
 */
HICON16 WINAPI ExtractIconEx16(
	LPCSTR lpszFile, INT16 nIconIndex, HICON16 *phiconLarge,
	HICON16 *phiconSmall, UINT16 nIcons
) {
    HICON	*ilarge,*ismall;
    UINT16	ret;
    int		i;

    if (phiconLarge)
    	ilarge = (HICON*)HeapAlloc(GetProcessHeap(),0,nIcons*sizeof(HICON));
    else
    	ilarge = NULL;
    if (phiconSmall)
    	ismall = (HICON*)HeapAlloc(GetProcessHeap(),0,nIcons*sizeof(HICON));
    else
    	ismall = NULL;
    ret = ExtractIconExA(lpszFile,nIconIndex,ilarge,ismall,nIcons);
    if (ilarge) {
    	for (i=0;i<nIcons;i++)
	    phiconLarge[i]=ilarge[i];
	HeapFree(GetProcessHeap(),0,ilarge);
    }
    if (ismall) {
    	for (i=0;i<nIcons;i++)
	    phiconSmall[i]=ismall[i];
	HeapFree(GetProcessHeap(),0,ismall);
    }
    return ret;
}

/*************************************************************************
 *				ExtractAssociatedIcon	[SHELL.36]
 * 
 * Return icon for given file (either from file itself or from associated
 * executable) and patch parameters if needed.
 */
HICON WINAPI ExtractAssociatedIconA(HINSTANCE hInst, LPSTR lpIconPath, LPWORD lpiIcon)
{	TRACE("\n");
	return ExtractAssociatedIcon16(hInst,lpIconPath,lpiIcon);
}

HICON16 WINAPI ExtractAssociatedIcon16(HINSTANCE16 hInst, LPSTR lpIconPath, LPWORD lpiIcon)
{	HICON16 hIcon;

	TRACE("\n");

	hIcon = ExtractIcon16(hInst, lpIconPath, *lpiIcon);

	if( hIcon < 2 )
	{ if( hIcon == 1 ) /* no icons found in given file */
	  { char  tempPath[0x80];
	    UINT16  uRet = FindExecutable16(lpIconPath,NULL,tempPath);

	    if( uRet > 32 && tempPath[0] )
	    { strcpy(lpIconPath,tempPath);
	      hIcon = ExtractIcon16(hInst, lpIconPath, *lpiIcon);
	      if( hIcon > 2 ) 
	        return hIcon;
	    }
	    else hIcon = 0;
	  }

	  if( hIcon == 1 ) 
	    *lpiIcon = 2;   /* MSDOS icon - we found .exe but no icons in it */
	  else
	    *lpiIcon = 6;   /* generic icon - found nothing */

	  GetModuleFileName16(hInst, lpIconPath, 0x80);
	  hIcon = LoadIcon16( hInst, MAKEINTRESOURCE16(*lpiIcon));
	}
	return hIcon;
}

/*************************************************************************
 *				FindEnvironmentString	[SHELL.38]
 *
 * Returns a pointer into the DOS environment... Ugh.
 */
LPSTR SHELL_FindString(LPSTR lpEnv, LPCSTR entry)
{ UINT16 l;

  TRACE("\n");

  l = strlen(entry); 
  for( ; *lpEnv ; lpEnv+=strlen(lpEnv)+1 )
  { if( lstrncmpiA(lpEnv, entry, l) ) 
      continue;
	if( !*(lpEnv+l) )
	    return (lpEnv + l); 		/* empty entry */
	else if ( *(lpEnv+l)== '=' )
	    return (lpEnv + l + 1);
    }
    return NULL;
}

SEGPTR WINAPI FindEnvironmentString16(LPSTR str)
{ SEGPTR  spEnv;
  LPSTR lpEnv,lpString;
  TRACE("\n");
    
  spEnv = GetDOSEnvironment16();

  lpEnv = (LPSTR)PTR_SEG_TO_LIN(spEnv);
  lpString = (spEnv)?SHELL_FindString(lpEnv, str):NULL; 

    if( lpString )		/*  offset should be small enough */
	return spEnv + (lpString - lpEnv);
    return (SEGPTR)NULL;
}

/*************************************************************************
 *              		DoEnvironmentSubst      [SHELL.37]
 *
 * Replace %KEYWORD% in the str with the value of variable KEYWORD
 * from "DOS" environment.
 */
DWORD WINAPI DoEnvironmentSubst16(LPSTR str,WORD length)
{
  LPSTR   lpEnv = (LPSTR)PTR_SEG_TO_LIN(GetDOSEnvironment16());
  LPSTR   lpBuffer = (LPSTR)HeapAlloc( GetProcessHeap(), 0, length);
  LPSTR   lpstr = str;
  LPSTR   lpbstr = lpBuffer;

  CharToOemA(str,str);

  TRACE("accept %s\n", str);

  while( *lpstr && lpbstr - lpBuffer < length )
   {
     LPSTR lpend = lpstr;

     if( *lpstr == '%' )
       {
	  do { lpend++; } while( *lpend && *lpend != '%' );
	  if( *lpend == '%' && lpend - lpstr > 1 )	/* found key */
	    {
	       LPSTR lpKey;
	      *lpend = '\0';  
	       lpKey = SHELL_FindString(lpEnv, lpstr+1);
	       if( lpKey )				/* found key value */
		 {
		   int l = strlen(lpKey);

		   if( l > length - (lpbstr - lpBuffer) - 1 )
		     {
           WARN("-- Env subst aborted - string too short\n");
		      *lpend = '%';
		       break;
		     }
		   strcpy(lpbstr, lpKey);
		   lpbstr += l;
		 }
	       else break;
	      *lpend = '%';
	       lpstr = lpend + 1;
	    }
	  else break;					/* back off and whine */

	  continue;
       } 

     *lpbstr++ = *lpstr++;
   }

 *lpbstr = '\0';
  if( lpstr - str == strlen(str) )
    {
      strncpy(str, lpBuffer, length);
      length = 1;
    }
  else
      length = 0;

  TRACE("-- return %s\n", str);

  OemToCharA(str,str);
  HeapFree( GetProcessHeap(), 0, lpBuffer);

  /*  Return str length in the LOWORD
   *  and 1 in HIWORD if subst was successful.
   */
 return (DWORD)MAKELONG(strlen(str), length);
}

/*************************************************************************
 *				ShellHookProc		[SHELL.103]
 * System-wide WH_SHELL hook.
 */
LRESULT WINAPI ShellHookProc16(INT16 code, WPARAM16 wParam, LPARAM lParam)
{
    TRACE("%i, %04x, %08x\n", code, wParam, 
						      (unsigned)lParam );
    if( SHELL_hHook && SHELL_hWnd )
    {
	UINT16	uMsg = 0;
        switch( code )
        {
	    case HSHELL_WINDOWCREATED:		uMsg = uMsgWndCreated;   break;
	    case HSHELL_WINDOWDESTROYED:	uMsg = uMsgWndDestroyed; break;
	    case HSHELL_ACTIVATESHELLWINDOW: 	uMsg = uMsgShellActivate;
        }
	PostMessage16( SHELL_hWnd, uMsg, wParam, 0 );
    }
    return CallNextHookEx16( WH_SHELL, code, wParam, lParam );
}

/*************************************************************************
 *				RegisterShellHook	[SHELL.102]
 */
BOOL WINAPI RegisterShellHook16(HWND16 hWnd, UINT16 uAction)
{ 
    TRACE("%04x [%u]\n", hWnd, uAction );

    switch( uAction )
    { 
    case 2:  /* register hWnd as a shell window */
        if( !SHELL_hHook )
        { 
            HMODULE16 hShell = GetModuleHandle16( "SHELL" );
            HOOKPROC16 hookProc = (HOOKPROC16)NE_GetEntryPoint( hShell, 103 );
            SHELL_hHook = SetWindowsHookEx16( WH_SHELL, hookProc, hShell, 0 );
            if ( SHELL_hHook )
            { 
                uMsgWndCreated = RegisterWindowMessageA( lpstrMsgWndCreated );
                uMsgWndDestroyed = RegisterWindowMessageA( lpstrMsgWndDestroyed );
                uMsgShellActivate = RegisterWindowMessageA( lpstrMsgShellActivate );
            } 
            else 
                WARN("-- unable to install ShellHookProc()!\n");
        }

        if ( SHELL_hHook )
            return ((SHELL_hWnd = hWnd) != 0);
        break;

    default:
        WARN("-- unknown code %i\n", uAction );
        SHELL_hWnd = 0; /* just in case */
    }
    return FALSE;
}