Page 2 - Need help resizing a bitmap file

//  Issue.You're using OldHeight and OldWidth in your outer and inner loops
//   You should be using your newly calculated width and height for your
//	new bitmap image

 // iterate over infile's scanlines
  for (int i = 0; i < abs(OldHeight); i++) {
    // iterate over pixels in scanline
    for (int j = 0; j < Oldwidth; j++) {
      // temporary storage
      RGBTRIPLE triple;
      // read RGB triple from infile
      fread(&triple, sizeof(RGBTRIPLE), 1, inptr);

// Issue.  Here you continually update the same area in buffer 
//  buffer[0] to buffer[factor-1]
//  You must "expand" the pixels here  to completely fill in the buffer file
//  This means you must use a temporary index variable to iterate thru the 
//  buffer variable in order to fill it with the expanded RGB pixels
      //iterate over each pixel factor times
      for (int k = 0; k < factor; k++) {
        buffer[k] = triple;
      }
// Issue.  Here you are ONLY writing THREE bytes in triple to your output file,
//  You should be writing the completely filled in buffer variable.
// In other words, the fwrite is completely wrong
  
// write RGB triple to outfile
// fwrite(&triple, sizeof(RGBTRIPLE), bi.biWidth, outptr);
    }
// Issue.  The following is totally meaningless.  You should skipping over the padding at the end
// of the old file row.  padding, if correctly computed will range between zero and three.
// Why are you adding 54?
	
    // skip over padding, if any
    fseek(inptr, 54 + (Oldwidth * sizeof(RGBTRIPLE) * i), SEEK_SET);

//  Ok. You got this one almost right.  You should be using the width of the new file
    for (int r = 0; r < factor; r++) {
      fwrite(buffer, sizeof(RGBTRIPLE), bi.biWidth, outptr);
    }
// Ok.  the following is correct	
    // write padding to outfile
    for (int p = 0; p < padding; p++)
      fputc(0x00, outptr);
  }

  // iterate over infile's scanlines
  for (int i = 0, BHeight = abs(OldHeight); i < BHeight; i++) {
    int bp = 0;
    // iterate over pixels in scanline
    for (int j = 0; j < Oldwidth; j++) {
      // temporary storage
      RGBTRIPLE triple = { 0xde, 0xad, 0xca };

      // read RGB triple from infile
      fread(&triple, sizeof(RGBTRIPLE), 1, inptr);

      //iterate over each pixel factor times  
      for (int k = 0; k < factor; k++) {
        buffer[bp++] = triple;
      }
    }
    // write RGB triple to outfile 
    // fwrite(&triple, sizeof(RGBTRIPLE), bi.biWidth, outptr); 
    for (int k = 0; k < factor; k++) {
      fwrite(buffer, 1, sizeof(RGBTRIPLE) * bi.biWidth, outptr);
      for (int p = 0; p < padding; p++)
        fputc(0x00, outptr);
    }
    // skip over padding, if any
    fseek(inptr, oldpadding, SEEK_CUR);
  }