DIBRead.cpp

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// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1995 Microsoft Corporation
// All rights reserved.

// Modified by Akos Ledeczi
// Copyright (C) 1997 Vanderbilt University

#include "stdafx.h"
#include "dibapi.h"

#define DIB_HEADER_MARKER   ((WORD) ('M' << 8) | 'B')

/*************************************************************************

  Function:  ReadDIBFile (CFile&)

   Purpose:  Reads in the specified DIB file into a global chunk of
                         memory.

   Returns:  A handle to a dib (hDIB) if successful.
                         NULL if an error occurs.

  Comments:  BITMAPFILEHEADER is stripped off of the DIB.  Everything
                         from the end of the BITMAPFILEHEADER structure on is
                         returned in the global memory handle.

*************************************************************************/


HDIB WINAPI ReadDIBFile(CFile& file)
{
        BITMAPFILEHEADER bmfHeader;
        DWORD dwBitsSize;
        HDIB hDIB;
        LPSTR pDIB;

        dwBitsSize = (DWORD) file.GetLength();

        if (file.Read((LPSTR)&bmfHeader, sizeof(bmfHeader)) != sizeof(bmfHeader))
                return NULL;
        if (bmfHeader.bfType != DIB_HEADER_MARKER)
                return NULL;

        hDIB = (HDIB) ::GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT, dwBitsSize);
        if (hDIB == 0)
                return NULL;

        pDIB = (LPSTR) ::GlobalLock((HGLOBAL) hDIB);
        if (file.Read(pDIB, dwBitsSize - sizeof(BITMAPFILEHEADER)) != //ReadHuge previously
                dwBitsSize - sizeof(BITMAPFILEHEADER) )
        {
                ::GlobalUnlock((HGLOBAL) hDIB);
                ::GlobalFree((HGLOBAL) hDIB);
                return NULL;
        }
        ::GlobalUnlock((HGLOBAL) hDIB);

        return hDIB;
}

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