/**
Set the size of a file.
This function changes the file size info from the FileHandle's EFI_FILE_INFO
data.
@param[in] FileHandle The file handle whose size is to be changed.
@param[in] Size The new size.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR Cannot access the file.
@retval EFI_INVALID_PARAMETER FileHandle is NULL.
**/
EFI_STATUS
EFIAPI
FileHandleSetSize (
IN EFI_FILE_HANDLE FileHandle,
IN UINT64 Size
)
{
EFI_FILE_INFO *FileInfo;
EFI_STATUS Status;
if (FileHandle == NULL) {
return (EFI_INVALID_PARAMETER);
}
//
// get the FileInfo structure
//
FileInfo = FileHandleGetInfo(FileHandle);
if (FileInfo == NULL) {
return (EFI_DEVICE_ERROR);
}
//
// Assign the FileSize pointer to the new value
//
FileInfo->FileSize = Size;
Status = FileHandleSetInfo(FileHandle, FileInfo);
//
// free the FileInfo memory
//
FreePool(FileInfo);
return (Status);
}
/**
Open the NvVars file for reading or writing
@param[in] File - The file to inspect
@param[out] Exists - Returns whether the file exists
@param[out] Size - Returns the size of the file
(0 if the file does not exist)
**/
EFI_STATUS
FileHandleEmpty (
IN EFI_FILE_HANDLE File
)
{
EFI_STATUS Status;
EFI_FILE_INFO *FileInfo;
//
// Retrieve the FileInfo structure
//
FileInfo = FileHandleGetInfo (File);
if (FileInfo == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// If the path is a directory, then return an error
//
if ((FileInfo->Attribute & EFI_FILE_DIRECTORY) != 0) {
FreePool (FileInfo);
return EFI_INVALID_PARAMETER;
}
//
// If the file size is already 0, then it is empty, so
// we can return success.
//
if (FileInfo->FileSize == 0) {
FreePool (FileInfo);
return EFI_SUCCESS;
}
//
// Set the file size to 0.
//
FileInfo->FileSize = 0;
Status = FileHandleSetInfo (File, FileInfo);
FreePool (FileInfo);
return Status;
}
