Modify PrivateExtractIcons{AW} to match better current MDSN

[wine/wine64.git] / dlls / user / exticon.c

/*
 *      icon extracting
 *
 * taken and slightly changed from shell
 * this should replace the icon extraction code in shell32 and shell16 once
 * it needs a serious test for compliance with the native API
 *
 * Copyright 2000 Juergen Schmied
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <string.h>
#include <stdlib.h>     /* abs() */
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#include "winbase.h"
#include "windef.h"
#include "winerror.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/winbase16.h"
#include "cursoricon.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(icon);

#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 (RES_ICON or RES_CURSOR) */
    WORD            idCount;      /* How many images */
    icoICONDIRENTRY idEntries[1]; /* An entry for each image (idCount of 'em) */
} icoICONDIR, *LPicoICONDIR;

#include "poppack.h"

#if 0
static void dumpIcoDirEnty ( LPicoICONDIRENTRY entry )
{
        TRACE("width = 0x%08x height = 0x%08x\n", entry->bWidth, entry->bHeight);
        TRACE("colors = 0x%08x planes = 0x%08x\n", entry->bColorCount, entry->wPlanes);
        TRACE("bitcount = 0x%08x bytesinres = 0x%08lx offset = 0x%08lx\n",
        entry->wBitCount, entry->dwBytesInRes, entry->dwImageOffset);
}
static void dumpIcoDir ( LPicoICONDIR entry )
{
        TRACE("type = 0x%08x count = 0x%08x\n", entry->idType, entry->idCount);
}
#endif

/**********************************************************************
 *  find_entry_by_id
 *
 * Find an entry by id in a resource directory
 * Copied from loader/pe_resource.c (FIXME: should use exported resource functions)
 */
static const IMAGE_RESOURCE_DIRECTORY *find_entry_by_id( const IMAGE_RESOURCE_DIRECTORY *dir,
                                                         WORD id, const void *root )
{
    const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
    int min, max, pos;

    entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
    min = dir->NumberOfNamedEntries;
    max = min + dir->NumberOfIdEntries - 1;
    while (min <= max)
    {
        pos = (min + max) / 2;
        if (entry[pos].u1.s2.Id == id)
            return (IMAGE_RESOURCE_DIRECTORY *)((char *)root + entry[pos].u2.s3.OffsetToDirectory);
        if (entry[pos].u1.s2.Id > id) max = pos - 1;
        else min = pos + 1;
    }
    return NULL;
}

/**********************************************************************
 *  find_entry_default
 *
 * Find a default entry in a resource directory
 * Copied from loader/pe_resource.c (FIXME: should use exported resource functions)
 */
static const IMAGE_RESOURCE_DIRECTORY *find_entry_default( const IMAGE_RESOURCE_DIRECTORY *dir,
                                                           const void *root )
{
    const IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
    entry = (const IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
    return (IMAGE_RESOURCE_DIRECTORY *)((char *)root + entry->u2.s3.OffsetToDirectory);
}

/*************************************************************************
 *                              USER32_GetResourceTable
 */
static DWORD USER32_GetResourceTable(LPBYTE peimage,DWORD pesize,LPBYTE *retptr)
{
        IMAGE_DOS_HEADER        * mz_header;

        TRACE("%p %p\n", peimage, retptr);

        *retptr = NULL;

        mz_header = (IMAGE_DOS_HEADER*) peimage;

        if (mz_header->e_magic != IMAGE_DOS_SIGNATURE)
        {
          if (mz_header->e_cblp == 1)   /* .ICO file ? */
          {
            *retptr = (LPBYTE)-1;       /* ICONHEADER.idType, must be 1 */
            return 1;
          }
          else
            return 0; /* failed */
        }
        if (mz_header->e_lfanew >= pesize) {
            return 0; /* failed, happens with PKZIP DOS Exes for instance. */
        }
        if (*((DWORD*)(peimage + mz_header->e_lfanew)) == IMAGE_NT_SIGNATURE )
          return IMAGE_NT_SIGNATURE;

        if (*((WORD*)(peimage + mz_header->e_lfanew)) == IMAGE_OS2_SIGNATURE )
        {
          IMAGE_OS2_HEADER      * ne_header;

          ne_header = (IMAGE_OS2_HEADER*)(peimage + mz_header->e_lfanew);

          if (ne_header->ne_magic != IMAGE_OS2_SIGNATURE)
            return 0;

          if( (ne_header->ne_restab - ne_header->ne_rsrctab) <= sizeof(NE_TYPEINFO) )
            *retptr = (LPBYTE)-1;
          else
            *retptr = peimage + mz_header->e_lfanew + ne_header->ne_rsrctab;

          return IMAGE_OS2_SIGNATURE;
        }
        return 0; /* failed */
}
/*************************************************************************
 *                      USER32_LoadResource
 */
static BYTE * USER32_LoadResource( LPBYTE peimage, NE_NAMEINFO* pNInfo, WORD sizeShift, ULONG *uSize)
{
        TRACE("%p %p 0x%08x\n", peimage, pNInfo, sizeShift);

        *uSize = (DWORD)pNInfo->length << sizeShift;
        return peimage + ((DWORD)pNInfo->offset << sizeShift);
}

/*************************************************************************
 *                      ICO_LoadIcon
 */
static BYTE * ICO_LoadIcon( LPBYTE peimage, LPicoICONDIRENTRY lpiIDE, ULONG *uSize)
{
        TRACE("%p %p\n", peimage, lpiIDE);

        *uSize = lpiIDE->dwBytesInRes;
        return peimage + lpiIDE->dwImageOffset;
}

/*************************************************************************
 *                      ICO_GetIconDirectory
 *
 * Reads .ico file and build phony ICONDIR struct
 * see http://www.microsoft.com/win32dev/ui/icons.htm
 */
#define HEADER_SIZE             (sizeof(CURSORICONDIR) - sizeof (CURSORICONDIRENTRY))
#define HEADER_SIZE_FILE        (sizeof(icoICONDIR) - sizeof (icoICONDIRENTRY))

static BYTE * ICO_GetIconDirectory( LPBYTE peimage, LPicoICONDIR* lplpiID, ULONG *uSize )
{
        CURSORICONDIR   * lpcid;        /* icon resource in resource-dir format */
        CURSORICONDIR   * lpID;         /* icon resource in resource format */
        int             i;

        TRACE("%p %p\n", peimage, lplpiID);

        lpcid = (CURSORICONDIR*)peimage;

        if( lpcid->idReserved || (lpcid->idType != 1) || (!lpcid->idCount) )
          return 0;

        /* allocate the phony ICONDIR structure */
        *uSize = lpcid->idCount * sizeof(CURSORICONDIRENTRY) + HEADER_SIZE;
        if( (lpID = (CURSORICONDIR*)HeapAlloc(GetProcessHeap(),0, *uSize) ))
        {
          /* copy the header */
          lpID->idReserved = lpcid->idReserved;
          lpID->idType = lpcid->idType;
          lpID->idCount = lpcid->idCount;

          /* copy the entries */
          for( i=0; i < lpcid->idCount; i++ )
          {
            memcpy((void*)&(lpID->idEntries[i]),(void*)&(lpcid->idEntries[i]), sizeof(CURSORICONDIRENTRY) - 2);
            lpID->idEntries[i].wResId = i;
          }

          *lplpiID = (LPicoICONDIR)peimage;
          return (BYTE *)lpID;
        }
        return 0;
}

/*************************************************************************
 *      ICO_ExtractIconExW              [internal]
 *
 * NOTES
 *  nIcons = 0: returns number of Icons in file
 *
 * returns
 *  failure:0; success: number of icons in file (nIcons = 0) or nr of icons retrieved
 */
static UINT ICO_ExtractIconExW(
        LPCWSTR lpszExeFileName,
        HICON * RetPtr,
        INT nIconIndex,
        UINT nIcons,
        UINT cxDesired,
        UINT cyDesired,
        UINT *pIconId,
        UINT flags)
{
        UINT            ret = 0;
        LPBYTE          pData;
        DWORD           sig;
        HANDLE          hFile;
        UINT16          iconDirCount = 0,iconCount = 0;
        LPBYTE          peimage;
        HANDLE          fmapping;
        ULONG           uSize;
        DWORD           fsizeh,fsizel;

        TRACE("%s, %d, %d %p 0x%08x\n", debugstr_w(lpszExeFileName), nIconIndex, nIcons, pIconId, flags);

        hFile = CreateFileW( lpszExeFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0 );
        if (hFile == INVALID_HANDLE_VALUE) return ret;
        fsizel = GetFileSize(hFile,&fsizeh);

        /* Map the file */
        fmapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY | SEC_COMMIT, 0, 0, NULL );
        CloseHandle( hFile );
        if (!fmapping)
        {
          WARN("CreateFileMapping error %ld\n", GetLastError() );
          return ret;
        }

        if ( !(peimage = MapViewOfFile(fmapping,FILE_MAP_READ,0,0,0)))
        {
          WARN("MapViewOfFile error %ld\n", GetLastError() );
          CloseHandle( fmapping );
          return ret;
        }
        CloseHandle( fmapping );

        sig = USER32_GetResourceTable(peimage,fsizel,&pData);

/* ico file */
        if( sig==IMAGE_OS2_SIGNATURE || sig==1 ) /* .ICO file */
        {
          BYTE          *pCIDir = 0;
          NE_TYPEINFO   *pTInfo = (NE_TYPEINFO*)(pData + 2);
          NE_NAMEINFO   *pIconStorage = NULL;
          NE_NAMEINFO   *pIconDir = NULL;
          LPicoICONDIR  lpiID = NULL;

          TRACE("-- OS2/icon Signature (0x%08lx)\n", sig);

          if( pData == (BYTE*)-1 )
          {
            /* FIXME: pCIDir is allocated on the heap - memory leak */
            pCIDir = ICO_GetIconDirectory(peimage, &lpiID, &uSize);     /* check for .ICO file */
            if( pCIDir )
            {
              iconDirCount = 1; iconCount = lpiID->idCount;
              TRACE("-- icon found %p 0x%08lx 0x%08x 0x%08x\n", pCIDir, uSize, iconDirCount, iconCount);
            }
          }
          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));
          }

          if( (pIconStorage && pIconDir) || lpiID )       /* load resources and create icons */
          {
            if( nIcons == 0 )
            {
              ret = iconDirCount;
            }
            else if( nIconIndex < iconDirCount )
            {
              UINT16   i, icon;
              if( nIcons > iconDirCount - nIconIndex )
                nIcons = iconDirCount - nIconIndex;

              for( i = nIconIndex; i < nIconIndex + nIcons; i++ )
              {
                /* .ICO files have only one icon directory */
                if( lpiID == NULL )     /* *.ico */
                  pCIDir = USER32_LoadResource( peimage, pIconDir + i, *(WORD*)pData, &uSize );
                RetPtr[i-nIconIndex] = (HICON)LookupIconIdFromDirectoryEx( pCIDir, TRUE, cxDesired, cyDesired, flags );
              }

              for( icon = nIconIndex; icon < nIconIndex + nIcons; icon++ )
              {
                pCIDir = NULL;
                if( lpiID )
                  pCIDir = ICO_LoadIcon( peimage, lpiID->idEntries + (int)RetPtr[icon-nIconIndex], &uSize);
                else
                  for ( i = 0; i < iconCount; i++ )
                    if ( pIconStorage[i].id == ((int)RetPtr[icon-nIconIndex] | 0x8000) )
                      pCIDir = USER32_LoadResource( peimage, pIconStorage + i,*(WORD*)pData, &uSize );

                if( pCIDir )
                  RetPtr[icon - nIconIndex] = (HICON)CreateIconFromResourceEx(pCIDir, uSize, TRUE, 0x00030000, cxDesired, cyDesired, flags);
                else
                  RetPtr[icon - nIconIndex] = 0;
              }
              ret = icon - nIconIndex;  /* return number of retrieved icons */
            }
          }
        }
/* end ico file */

/* exe/dll */
        else if( sig == IMAGE_NT_SIGNATURE )
        {
          LPBYTE                idata,igdata;
          PIMAGE_DOS_HEADER     dheader;
          PIMAGE_NT_HEADERS     pe_header;
          PIMAGE_SECTION_HEADER pe_sections;
          const IMAGE_RESOURCE_DIRECTORY *rootresdir,*iconresdir,*icongroupresdir;
          const IMAGE_RESOURCE_DATA_ENTRY *idataent,*igdataent;
          const IMAGE_RESOURCE_DIRECTORY_ENTRY *xresent;
          int                   i,j;

          dheader = (PIMAGE_DOS_HEADER)peimage;
          pe_header = (PIMAGE_NT_HEADERS)(peimage+dheader->e_lfanew);     /* it is a pe header, USER32_GetResourceTable checked that */
          pe_sections = (PIMAGE_SECTION_HEADER)(((char*)pe_header)+sizeof(*pe_header)); /* probably makes problems with short PE headers...*/
          rootresdir = NULL;

          /* search for the root resource directory */
          for (i=0;i<pe_header->FileHeader.NumberOfSections;i++)
          {
            if (pe_sections[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
              continue;
            if (fsizel < pe_sections[i].PointerToRawData+pe_sections[i].SizeOfRawData) {
              FIXME("File %s too short (section is at %ld bytes, real size is %ld)\n",
                      debugstr_w(lpszExeFileName),
                      pe_sections[i].PointerToRawData+pe_sections[i].SizeOfRawData,
                      fsizel
              );
              goto end;
            }
            /* FIXME: doesn't work when the resources are not in a separate section */
            if (pe_sections[i].VirtualAddress == pe_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress)
            {
              rootresdir = (PIMAGE_RESOURCE_DIRECTORY)(peimage+pe_sections[i].PointerToRawData);
              break;
            }
          }

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

          /* search for the group icon directory */
          if (!(icongroupresdir = find_entry_by_id(rootresdir, LOWORD(RT_GROUP_ICONW), rootresdir)))
          {
            WARN("No Icongroupresourcedirectory!\n");
            goto end;           /* failure */
          }
          iconDirCount = icongroupresdir->NumberOfNamedEntries + icongroupresdir->NumberOfIdEntries;

          /* only number of icons requested */
          if( nIcons == 0 )
          {
            ret = iconDirCount;
            goto end;           /* success */
          }

          if( nIconIndex < 0 )
          {
            /* search resource id */
            int n = 0;
            int iId = abs(nIconIndex);
            PIMAGE_RESOURCE_DIRECTORY_ENTRY xprdeTmp = (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(icongroupresdir+1);

            while(n<iconDirCount && xprdeTmp)
            {
              if(xprdeTmp->u1.s2.Id ==  iId)
              {
                  nIconIndex = n;
                  break;
              }
              n++;
              xprdeTmp++;
            }
            if (nIconIndex < 0)
            {
              WARN("resource id %d not found\n", iId);
              goto end;         /* failure */
            }
          }
          else
          {
            /* check nIconIndex to be in range */
            if (nIconIndex >= iconDirCount)
            {
              WARN("nIconIndex %d is larger than iconDirCount %d\n",nIconIndex,iconDirCount);
              goto end;         /* failure */
            }
          }

          /* assure we don't get too much */
          if( nIcons > iconDirCount - nIconIndex )
            nIcons = iconDirCount - nIconIndex;

          /* starting from specified index */
          xresent = (PIMAGE_RESOURCE_DIRECTORY_ENTRY)(icongroupresdir+1) + nIconIndex;

          for (i=0; i < nIcons; i++,xresent++)
          {
              const IMAGE_RESOURCE_DIRECTORY *resdir;

            /* go down this resource entry, name */
            resdir = (PIMAGE_RESOURCE_DIRECTORY)((DWORD)rootresdir+(xresent->u2.s3.OffsetToDirectory));

            /* default language (0) */
            resdir = find_entry_default(resdir,rootresdir);
            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;

              if (igdataent->OffsetToData-pe_sections[j].VirtualAddress+pe_sections[j].PointerToRawData+igdataent->Size > fsizel) {
                FIXME("overflow in PE lookup (%s has len %ld, have offset %ld), short file?\n", debugstr_w(lpszExeFileName), fsizel,
                           igdataent->OffsetToData - pe_sections[j].VirtualAddress + pe_sections[j].PointerToRawData + igdataent->Size);
                goto end; /* failure */
              }
              igdata = peimage+(igdataent->OffsetToData-pe_sections[j].VirtualAddress+pe_sections[j].PointerToRawData);
            }

            if (!igdata)
            {
              FIXME("no matching real address for icongroup!\n");
              goto end; /* failure */
            }
            RetPtr[i] = (HICON)LookupIconIdFromDirectoryEx(igdata, TRUE, cxDesired, cyDesired, flags);
          }

          if (pIconId)
                *pIconId = LOWORD(*RetPtr);
                 
          if (!(iconresdir=find_entry_by_id(rootresdir,LOWORD(RT_ICONW),rootresdir)))
          {
            WARN("No Iconresourcedirectory!\n");
            goto end;           /* failure */
          }

          for (i=0; i<nIcons; i++)
          {
        const IMAGE_RESOURCE_DIRECTORY *xresdir;
        xresdir = find_entry_by_id(iconresdir,LOWORD(RetPtr[i]),rootresdir);
        xresdir = find_entry_default(xresdir,rootresdir);
            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] = (HICON) CreateIconFromResourceEx(idata,idataent->Size,TRUE,0x00030000, cxDesired, cyDesired, flags);
          }
          ret = i;      /* return number of retrieved icons */
        }                       /* if(sig == IMAGE_NT_SIGNATURE) */

end:
        UnmapViewOfFile(peimage);       /* success */
        return ret;
}

/***********************************************************************
 *           PrivateExtractIconsW                       [USER32.@]
 *
 * NOTES
 *  nIndex = 1: a small and a large icon are extracted.
 *  the higher word of sizeXY contains the size of the small icon, the lower
 *  word the size of the big icon. phicon points to HICON[2].
 *
 * FIXME:
 * 1) should also support 16 bit EXE + DLLs, cursor and animated cursor as well
 *    as bitmap files.
 * 2) should return according to MSDN
 *  phicons == NULL     : the number of icons in file or 0 on error
 *  phicons != NULL     : the number of icons extracted or 0xFFFFFFFF on error
 *        does return in Win2000
 *  when file valid the number of icons or 0 on any error
 *  when file invalid and phicon == NULL returns 0
 *  when file invalid and phicon != NULL returns 0xFFFFFFFF
 *
 * *pIconID is always set to 0 when file invalid
 * *pIconID is always set to 0xFFFFFFFF for valid icon and cursor files
 * *pIconID is set to actual identifier for valid dll/exes or -1 on error
 */

UINT WINAPI PrivateExtractIconsW (
        LPCWSTR lpwstrFile,
        int nIndex,
        int sizeX,
        int sizeY,
        HICON * phicon, /* [out] pointer to array of HICON handles */
        UINT* pIconId,  /* [out] pointer to returned icon identifier which fits best */
        UINT nIcons,    /* [in] number of icons to retrieve */
        UINT flags )    /* [in] LR_* flags used by LoadImage */
{
    UINT ret;
    TRACE("%s %d %dx%d %p %p %d 0x%08x\n",
          debugstr_w(lpwstrFile), nIndex, sizeX, sizeY, phicon, pIconId, nIcons, flags);

        if (pIconId) /* Invalidate icon identifier on entry */
                *pIconId = 0xFFFFFFFF;
                
    if (!phicon)
      return ICO_ExtractIconExW(lpwstrFile, NULL, nIndex, 0, sizeX & 0xffff, sizeY & 0xffff, pIconId, flags);
                
    if ((nIcons == 2) && HIWORD(sizeX) && HIWORD(sizeY))
    {
      ret = ICO_ExtractIconExW(lpwstrFile, phicon, nIndex, 1, sizeX & 0xffff, sizeY & 0xffff, pIconId, flags);
      if (!SUCCEEDED(ret)) return ret;
      ret = ICO_ExtractIconExW(lpwstrFile, phicon+1, nIndex, 1, (sizeX>>16) & 0xffff, (sizeY>>16) & 0xffff, pIconId, flags);
    } else
      ret = ICO_ExtractIconExW(lpwstrFile, phicon, nIndex, nIcons, sizeX & 0xffff, sizeY & 0xffff, pIconId, flags);
    return ret;
}

/***********************************************************************
 *           PrivateExtractIconsA                       [USER32.@]
 */

UINT WINAPI PrivateExtractIconsA (
        LPCSTR lpstrFile,
        int nIndex,
        int sizeX,
        int sizeY,
        HICON * phicon,
        UINT* piconid,  /* [out] pointer to returned icon identifier which fits best */
        UINT nIcons,    /* [in] number of icons to retrieve */
        UINT flags )    /* [in] LR_* flags used by LoadImage */
{
    UINT ret;
    INT len = MultiByteToWideChar(CP_ACP, 0, lpstrFile, -1, NULL, 0);
    LPWSTR lpwstrFile = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));

    MultiByteToWideChar(CP_ACP, 0, lpstrFile, -1, lpwstrFile, len);
    ret = PrivateExtractIconsW(lpwstrFile, nIndex, sizeX, sizeY, phicon, piconid, nIcons, flags);

    HeapFree(GetProcessHeap(), 0, lpwstrFile);
    return ret;
}

/***********************************************************************
 *           PrivateExtractIconExW                      [USER32.@]
 * NOTES
 *  if nIcons = -1 it returns the number of icons in any case !!!
 */
HRESULT WINAPI PrivateExtractIconExW (
        LPCWSTR lpwstrFile,
        DWORD nIndex,
        HICON * phIconLarge,
        HICON * phIconSmall,
        UINT nIcons )
{
        DWORD cyicon, cysmicon, cxicon, cxsmicon;
        HRESULT ret = 0;

        TRACE("%s 0x%08lx %p %p 0x%08x\n",
        debugstr_w(lpwstrFile),nIndex,phIconLarge, phIconSmall, nIcons);

        if (nIndex == 1 && phIconSmall && phIconLarge)
        {
          HICON hIcon[2];
          cxicon = GetSystemMetrics(SM_CXICON);
          cyicon = GetSystemMetrics(SM_CYICON);
          cxsmicon = GetSystemMetrics(SM_CXSMICON);
          cysmicon = GetSystemMetrics(SM_CYSMICON);

          ret = PrivateExtractIconsW ( lpwstrFile, nIndex, cxicon | (cxsmicon<<16),  cyicon | (cysmicon<<16),
          (HICON*) &hIcon, 0, 2, 0 );
          *phIconLarge = hIcon[0];
          *phIconSmall = hIcon[1];
          return ret;
        }

        if (nIndex != -1)
        {
          if (phIconSmall)
          {
            /* extract n small icons */
            cxsmicon = GetSystemMetrics(SM_CXSMICON);
            cysmicon = GetSystemMetrics(SM_CYSMICON);
            ret = PrivateExtractIconsW ( lpwstrFile, nIndex, cxsmicon, cysmicon, phIconSmall, 0, nIcons, 0 );
          }
          if (phIconLarge )
          {
            /* extract n large icons */
            cxicon = GetSystemMetrics(SM_CXICON);
            cyicon = GetSystemMetrics(SM_CYICON);
            ret = PrivateExtractIconsW ( lpwstrFile, nIndex, cxicon, cyicon, phIconLarge, 0, nIcons, 0 );
          }
          return ret;
        }

        /* get the number of icons */
        return PrivateExtractIconsW ( lpwstrFile, 0, 0, 0, 0, 0, 0, 0 );
}

/***********************************************************************
 *           PrivateExtractIconExA                      [USER32.@]
 */
HRESULT WINAPI PrivateExtractIconExA (
        LPCSTR lpstrFile,
        DWORD nIndex,
        HICON * phIconLarge,
        HICON * phIconSmall,
        UINT nIcons )
{
        DWORD ret;
        INT len = MultiByteToWideChar( CP_ACP, 0, lpstrFile, -1, NULL, 0 );
        LPWSTR lpwstrFile = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );

        TRACE("%s 0x%08lx %p %p 0x%08x\n", lpstrFile, nIndex, phIconLarge, phIconSmall, nIcons);

        MultiByteToWideChar( CP_ACP, 0, lpstrFile, -1, lpwstrFile, len );
        ret = PrivateExtractIconExW(lpwstrFile,nIndex,phIconLarge, phIconSmall, nIcons);
        HeapFree(GetProcessHeap(), 0, lpwstrFile);
        return ret;
}