FNOPEN macro (fdi.h)

Article
11/12/2024

The FNOPEN macro provides the declaration for the application-defined callback function to open a file in an FDI context.

Syntax

void FNOPEN(
  [in]  fn
);

Parameters

[in] fn

The name of the file.

In the case of a file in the cabinet, the name comes directly from the cabinet file. If the cabinet file is malicious, the name may contain illegal or malicious file name characters.

Return value

None

Remarks

The function accepts parameters similar to _open.

Examples

FNOPEN(fnFileOpen)
{
    HANDLE hFile = NULL;
    DWORD dwDesiredAccess = 0; 
    DWORD dwCreationDisposition = 0;

    UNREFERENCED_PARAMETER(pmode);

    if ( oflag & _O_RDWR )
    {
        dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
    }
    else if ( oflag & _O_WRONLY )
    {
        dwDesiredAccess = GENERIC_WRITE;
    }
    else
    {
        dwDesiredAccess = GENERIC_READ;
    }

    if ( oflag & _O_CREAT )
    {
        dwCreationDisposition = CREATE_ALWAYS;
    }
    else
    {
        dwCreationDisposition = OPEN_EXISTING;
    }

    hFile = CreateFileA(pszFile, 
                        dwDesiredAccess,
                        FILE_SHARE_READ,
                        NULL,
                        dwCreationDisposition,
                        FILE_ATTRIBUTE_NORMAL,
                        NULL);

    return (INT_PTR)hFile;
}

Requirements

Requirement	Value
Target Platform	Windows
Header	fdi.h

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