/** @file
Python Utility

Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available 
under the terms and conditions of the BSD License which accompanies this 
distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <Python.h>
#include <Windows.h>
#include <Common/UefiBaseTypes.h>

/*
 SaveFileToDisk(FilePath, Content)
*/
STATIC
PyObject*
SaveFileToDisk (
  PyObject    *Self,
  PyObject    *Args
  )
{
  CHAR8         *File;
  UINT8         *Data;
  UINTN         DataLength;
  UINTN         WriteBytes;
  UINTN         Status;
  HANDLE        FileHandle;
  PyObject      *ReturnValue = Py_False;

  Status = PyArg_ParseTuple(
            Args,
            "ss#",
            &File,
            &Data,
            &DataLength
            );
  if (Status == 0) {
    return NULL;
  }

  FileHandle = CreateFile(
                File,
                GENERIC_WRITE,
                FILE_SHARE_WRITE|FILE_SHARE_READ|FILE_SHARE_DELETE,
                NULL,
                CREATE_ALWAYS,
                FILE_ATTRIBUTE_NORMAL,
                NULL
                );
  if (FileHandle == INVALID_HANDLE_VALUE) {
    PyErr_SetString(PyExc_Exception, "File creation failure");
    return NULL;
  }

  while (WriteFile(FileHandle, Data, DataLength, &WriteBytes, NULL)) {
    if (DataLength <= WriteBytes) {
      DataLength = 0;
      break;
    }

    Data += WriteBytes;
    DataLength -= WriteBytes;
  }

  if (DataLength != 0) {
    // file saved unsuccessfully
    PyErr_SetString(PyExc_Exception, "File write failure");
    goto Done;
  }

  // 
  // Flush buffer may slow down the whole build performance (average 10s slower)
  // 
  //if (!FlushFileBuffers(FileHandle)) {
  //  PyErr_SetString(PyExc_Exception, "File flush failure");
  //  goto Done;
  //}

  // success!
  ReturnValue = Py_True;

Done:
  CloseHandle(FileHandle);
  return ReturnValue;
}

STATIC INT8 SaveFileToDiskDocs[] = "SaveFileToDisk(): Make sure the file is saved to disk\n";

STATIC PyMethodDef PyUtility_Funcs[] = {
  {"SaveFileToDisk", (PyCFunction)SaveFileToDisk, METH_VARARGS, SaveFileToDiskDocs},
  {NULL, NULL, 0, NULL}
};

PyMODINIT_FUNC
initPyUtility(VOID) {
  Py_InitModule3("PyUtility", PyUtility_Funcs, "Utilties Module Implemented C Language");
}