libjpeg ycc_rgb_convert memory error

[Gregor]

I've been trying to get libjpeg working in my project. So far I have sucsessfully compiled it and it's sample programs, however, I get problems running my own code.

FILE* input_file;
JDIMENSION num_scanlines;
	
int file_index;
djpeg_dest_ptr dest_mgr = NULL;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);

if ((input_file = fopen("C:\\OpenGL\\Projects\\Debug\\Data\\testimg.jpg", "rb")) == NULL) {
      return 10;
}

jpeg_stdio_src(&cinfo, input_file);

jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
JSAMPLE * buffer = new JSAMPLE[cinfo.output_width*cinfo.output_components*cinfo.output_height];
/* Process data */
while (cinfo.output_scanline < cinfo.output_height) {
	num_scanlines = jpeg_read_scanlines(&cinfo,(JSAMPARRAY) buffer,cinfo.output_height);
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
//END	 

The runtime error is generated in this function, line marked by a comment

METHODDEF(void)
ycc_rgb_convert (j_decompress_ptr cinfo,
		 JSAMPIMAGE input_buf, JDIMENSION input_row,
		 JSAMPARRAY output_buf, int num_rows)
{
  my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
  register int y, cb, cr;
  register JSAMPROW outptr;
  register JSAMPROW inptr0, inptr1, inptr2;
  register JDIMENSION col;
  JDIMENSION num_cols = cinfo->output_width;
  /* copy these pointers into registers if possible */
  register JSAMPLE * range_limit = cinfo->sample_range_limit;
  register int * Crrtab = cconvert->Cr_r_tab;
  register int * Cbbtab = cconvert->Cb_b_tab;
  register INT32 * Crgtab = cconvert->Cr_g_tab;
  register INT32 * Cbgtab = cconvert->Cb_g_tab;
  SHIFT_TEMPS

  while (--num_rows >= 0) {
    inptr0 = input_buf[0][input_row];
    inptr1 = input_buf[1][input_row];
    inptr2 = input_buf[2][input_row];
    input_row++;
    outptr = *output_buf++;
    for (col = 0; col < num_cols; col++) {
      y  = GETJSAMPLE(inptr0[col]);
      cb = GETJSAMPLE(inptr1[col]);
      cr = GETJSAMPLE(inptr2[col]);
      /* Range-limiting is essential due to noise introduced by DCT losses. */
      outptr[RGB_RED] =   range_limit[y + Crrtab[cr]];//<-memory access violation here; somthing is wrong with outptr!
      outptr[RGB_GREEN] = range_limit[y +
			      ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
						 SCALEBITS))];
      outptr[RGB_BLUE] =  range_limit[y + Cbbtab[cb]];
      outptr += RGB_PIXELSIZE;
    }
  }
}

I have no clue how to solve this problem, any help would be much apprechiated!

Thanks,

Gregor