source: trunk/src/ole32/library.cpp@ 3136

/* $Id: library.cpp,v 1.2 1999-09-08 11:29:27 davidr Exp $ */
/* 
 * 
 * Project Odin Software License can be found in LICENSE.TXT
 * 
 */
/* 
 * COM/OLE misc. functions.
 * 
 * 1/7/99
 * 
 * Copyright 1999 David J. Raison
 * 
 * Some portions from Wine Implementation
 *   Copyright 1995  Martin von Loewis
 *   Copyright 1998  Justin Bradford
 *   Copyright 1999  Francis Beaudet
 *   Copyright 1999  Sylvain St-Germain
 */

#include "ole32.h"

#include "oString.h"
#include "moniker.h"    // RunningObjectTableImpl_***

// ======================================================================
// Local Data
// ======================================================================

/*
 * this open DLL table belongs in a per process table, but my guess is that
 * it shouldn't live in the kernel, so I'll put them out here in DLL
 * space assuming that there is one OLE32 per process.
 */
typedef struct tagOpenDll 
{
    char *      DllName;                /* really only needed for debugging */
    HINSTANCE   hLibrary;       
    struct tagOpenDll * next;
} OpenDll;

static OpenDll * openDllList = NULL;    /* linked list of open dlls */

// ======================================================================
// Public API's
// ======================================================================

// ----------------------------------------------------------------------
// CoLoadLibrary
// ----------------------------------------------------------------------
HINSTANCE WIN32API CoLoadLibrary(LPSTR lpszLibName, BOOL bAutoFree)
{
    HINSTANCE   hLibrary;
    OpenDll *   ptr;
    OpenDll *   tmp;
    HANDLE      hdl = GetProcessHeap();
  
    dprintf(("OLE32: CoLoadLibrary(%s)", lpszLibName));

    hLibrary = LoadLibraryA(lpszLibName);

    if (!bAutoFree)
        return hLibrary;

    if (openDllList == NULL)
    {
        /* empty list -- add first node */
        openDllList = (OpenDll*)HeapAlloc(hdl, 0, sizeof(OpenDll));
        openDllList->DllName = (char *)HeapAlloc(hdl, 0, strlen(lpszLibName));
        strcpy(openDllList->DllName, lpszLibName);
        openDllList->hLibrary = hLibrary;
        openDllList->next = NULL;
    }
    else
    {
        /* search for this dll */
        int found = FALSE;
        for (ptr = openDllList; ptr->next != NULL; ptr=ptr->next)
        {
            if (ptr->hLibrary == hLibrary)
            {
                found = TRUE;
                break;
            }
        }
        if (!found)
        {
            /* dll not found, add it */
            tmp = openDllList;
            openDllList = (OpenDll*)HeapAlloc(hdl, 0, sizeof(OpenDll));
            openDllList->DllName = (char *)HeapAlloc(hdl, 0, strlen(lpszLibName));
            strcpy(openDllList->DllName, lpszLibName);
            openDllList->hLibrary = hLibrary;
            openDllList->next = tmp;
        }
    }
     
    return hLibrary;
}

// ----------------------------------------------------------------------
// CoFreeAllLibraries
// ----------------------------------------------------------------------
void WIN32API CoFreeAllLibraries()
{
    OpenDll *   ptr;
    OpenDll *   tmp;

    dprintf(("OLE32: CoFreeAllLibraries"));

    for (ptr = openDllList; ptr != NULL; )
    {
        tmp=ptr->next;
        CoFreeLibrary(ptr->hLibrary);
        ptr = tmp;
    }
}

// ----------------------------------------------------------------------
// CoFreeLibrary
// ----------------------------------------------------------------------
void WIN32API CoFreeLibrary(HINSTANCE hLibrary)
{
    OpenDll *   ptr;
    OpenDll *   prev;
    OpenDll *   tmp;

    dprintf(("OLE32: CoFreeLibrary"));

    /* lookup library in linked list */
    prev = NULL;
    for (ptr = openDllList; ptr != NULL; ptr=ptr->next)
    {
        if (ptr->hLibrary == hLibrary)
            break;

        prev = ptr;
    }

    if (ptr == NULL)
        return;

    /* assert: ptr points to the library entry to free */

    /* free library and remove node from list */
    FreeLibrary(hLibrary);
    if (ptr == openDllList)
    {
        tmp = openDllList->next;
        HeapFree(GetProcessHeap(), 0, openDllList->DllName);
        HeapFree(GetProcessHeap(), 0, openDllList);
        openDllList = tmp;
    }
    else
    {
        tmp = ptr->next;
        HeapFree(GetProcessHeap(), 0, ptr->DllName);
        HeapFree(GetProcessHeap(), 0, ptr);
        prev->next = tmp;
    }

}

// ----------------------------------------------------------------------
// CoFreeUnusedLibraries
// ----------------------------------------------------------------------
void WIN32API CoFreeUnusedLibraries()
{
    OpenDll *ptr, *tmp;
    typedef HRESULT(*DllCanUnloadNowFunc)(void);
    DllCanUnloadNowFunc DllCanUnloadNow;

    dprintf(("OLE32: CoFreeUnusedLibraries"));

    for (ptr = openDllList; ptr != NULL; )
    {
        DllCanUnloadNow = (DllCanUnloadNowFunc) GetProcAddress(ptr->hLibrary, "DllCanUnloadNow");
        
        if ( (DllCanUnloadNow != NULL) && (DllCanUnloadNow() == S_OK) )
        {
            tmp=ptr->next;
            CoFreeLibrary(ptr->hLibrary);
            ptr = tmp;
        }
        else
        {
            ptr=ptr->next;
        }
    }
}