windows-nt-4.0/private/ntos/w32/ntgdi/gre/meta.cxx

/******************************Module*Header*******************************\
* Module Name: meta.cxx
*
* This contains the methods for the gdi object METAOBJ.
* A METAOBJ is block for temporary storage of metafile data which usually
* lives on the client side
*
* Created: 06-Jan-1992
* Author: John Colleran [johnc]
*
* Copyright (c) 1992 Microsoft Corporation
\**************************************************************************/

#include "precomp.hxx"

#if DBG
LONG cSrvMetaFile = 0;
LONG cMaxSrvMetaFile = 0;
#endif

/******************************Public*Routine******************************\
* bCopyClientData
*
* given pointers in the client and server and a size, copy
* the client memory into the server.
*
* History:
*  Wed Sep 16 09:42:22 1992     -by-    Hock San Lee    [hockl]
* Wrote it.
\**************************************************************************/

BOOL bCopyClientData(
    PVOID pvSrv,
    PVOID pvCli,
    ULONG cj)
{
    ULONG  c;
    HANDLE h;
    BOOL   bRet = TRUE;

    if (pvSrv == (PVOID) NULL)
        return(FALSE);

    if (cj > 0)
    {
        __try
        {
            //BUGBUG ProbeForRead(pvCli);

            RtlCopyMemory(pvSrv,pvCli,cj);
        }
        __except (EXCEPTION_EXECUTE_HANDLER)
        {
            bRet = FALSE;
        }
    }

    return(bRet);
}

/******************************Public*Routine******************************\
* metabSetClientData
*
* given a pointer in the client and a size,  copy the server memory to the
* client memory.  The pointer from this should be released
* with vFreeClientData().
*
* History:
*  23-Jul-1992 -by-  Eric Kutter [erick]
* Wrote it.
\**************************************************************************/

BOOL metabSetClientData(
    PVOID pvCli,
    PVOID pvSrv,
    ULONG cj)
{
    ULONG c;
    BOOL bResult = TRUE;

    if (pvSrv == (PVOID) NULL)
        return(FALSE);

    if (cj > 0)
    {
        __try
        {
            //BUGBUG ProbeForWrite(pvCli);

            RtlCopyMemory(pvCli,pvSrv,cj);
        }
        __except (EXCEPTION_EXECUTE_HANDLER)
        {
            bResult = FALSE;
        }
    }


    return(bResult);
}


/******************************Public*Routine******************************\
* METAOBJ::METAOBJ
*
* Allocates and locks down a hunk of RAM.  Kind of a memory object.
*
* History:
*  Wed 09-Oct-1991 -by- Patrick Haluptzok [patrickh]
* fill in size field for debugging purposes.
*
*  11-Feb-1991 -by- Patrick Haluptzok patrickh
* Wrote it.
\**************************************************************************/

METAOBJ::METAOBJ(DWORD iType, ULONG cbData, LPBYTE lpClientData, DWORD mm, DWORD xExt, DWORD yExt)
{
    pMeta = (PMETA) HmgAlloc(cbData + sizeof(META), META_TYPE, HMGR_ALLOC_LOCK | HMGR_MAKE_PUBLIC);

    if (pMeta)
    {
        if (!pMeta->bInit(iType, cbData, lpClientData, mm, xExt, yExt))
        {
            HmgFree((HOBJ)pMeta->hGet());
            pMeta = (PMETA) NULL;
        }
    }
}

/******************************Public*Routine******************************\
* METAOBJ::vDelete()
*
* Deletes hunk of RAM.
*
* History:
*  11-Feb-1991 -by- Patrick Haluptzok patrickh
* Wrote it.
\**************************************************************************/

VOID METAOBJ::vDelete()
{
// Get rid of that RAM.

    ASSERTGDI(pMeta, "METAOBJ::vDelete: bad pointer");

    if (pMeta != (PMETA) NULL)
    {
        HmgFree((HOBJ)pMeta->hGet());
        pMeta = (PMETA) NULL;           // don't unlock again!
    }
}

/******************************Public*Routine******************************\
* GreCreateServerMetaFile
*
* MetaFiles live on the client side but occasionally the need to be
* sent to the server side so they can be exchanged between processes
* via the clipboard.  The server MetaFile is a META object containing
* the metafile bits.
*
* Returns the handle to a server metafile of the bits lpClientData.
*
* History:
*  Wed Sep 16 09:42:22 1992     -by-    Hock San Lee    [hockl]
* Rewrote it.
*  30-Oct-1991 -by- John Colleran [johnc]
* Wrote it.
\**************************************************************************/

HANDLE GreCreateServerMetaFile(DWORD iType, ULONG cbData, LPBYTE lpClientData,
        DWORD mm, DWORD xExt, DWORD yExt)
{
    ASSERTGDI(iType != MFEN_IDENTIFIER || iType != MFPICT_IDENTIFIER,
        "GreCreateServerMetaFile: unknown type\n");

    METAOBJ mo(iType, cbData, lpClientData, mm, xExt, yExt);

    if (mo.bValid())
    {
#if DBG
        InterlockedIncrement(&cSrvMetaFile);
        if (cMaxSrvMetaFile < cSrvMetaFile)
            cMaxSrvMetaFile = cSrvMetaFile;

        if (cSrvMetaFile >= 100)
            DbgPrint("GreCreateServerMetaFile: Number of server metafiles is %ld\n", cSrvMetaFile);
#endif

        return(mo.hGet());
    }

    WARNING("GreCreateServerMetaFile: unable to create metafile");
    return((HANDLE) 0);
}

/******************************Public*Routine******************************\
* GreGetServerMetaFileBits
*
* MetaFiles live on the client side but occasionally the need to be
* sent to the server side so they can be exchanged between processes
*
* Returns the bits of a server metafile.
*
* History:
*  Wed Sep 16 09:42:22 1992     -by-    Hock San Lee    [hockl]
* Rewrote it.
*  30-Oct-1991 -by- John Colleran [johnc]
* Wrote it.
\**************************************************************************/

ULONG GreGetServerMetaFileBits(HANDLE hmo, ULONG cbData, LPBYTE lpClientData,
        PDWORD piType, PDWORD pmm, PDWORD pxExt, PDWORD pyExt)
{
    METAOBJ mo(hmo);

    if (mo.bValid())
    {
        PMETA pMeta = mo.pMetaGet();

        if (cbData)             // get metafile bits?
        {
            if (cbData != pMeta->cbData)
            {
                ASSERTGDI(FALSE, "GreGetServerMetaFileBits: sizes do no match");
                return(0);
            }

            *piType = pMeta->iType;
            *pmm    = pMeta->mm;
            *pxExt  = pMeta->xExt;
            *pyExt  = pMeta->yExt;

            if (!metabSetClientData((PVOID) lpClientData, (PVOID) pMeta->abData,
                pMeta->cbData))
            {
                ASSERTGDI(FALSE, "GreGetServerMetaFileBits: metabSetClientData failed");
                return(0);
            }
        }
        return(pMeta->cbData);
    }

    ASSERTGDI(FALSE, "GreGetServerMetaFileBits: bad metafile handle");
    return(0);
}

/******************************Public*Routine******************************\
* GreDeleteServerMetaFile
*
* MetaFiles live on the client side but occasionally the need to be
* sent to the server side so they can be exchanged between processes
*
* Deletes a server metafile
*
* History:
*  30-Oct-1991 -by- John Colleran [johnc]
* Wrote it.
\**************************************************************************/

BOOL GreDeleteServerMetaFile(HANDLE hmo)
{


    METAOBJ mo(hmo);

    if (mo.bValid())
    {
#if DBG
        InterlockedDecrement(&cSrvMetaFile);
        if (cSrvMetaFile < 0)
           ASSERTGDI(FALSE, "GreDeleteServerMetaFile: cSrvMetaFile < 0");
#endif

        mo.vDelete();
        return(TRUE);
    }

    WARNING("GreDeleteServerMetaFile: bad metafile handle");
    return(FALSE);
}