/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2006 Erwan Velu - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * -----------------------------------------------------------------------
*/

#include <stdio.h>
#include <string.h>
#include "vpd/vpd.h"

int vpd_checksum(char *buf, int len)
{
        uint8_t sum=0;
        int a;

        for(a=0; a<len; a++)
                sum+=buf[a];
        return (sum==0);
}

int vpd_decode(s_vpd *vpd) {
  uint8_t buf[16];
  char *p,*q;

  /* Cleaning structures */
  memset(&vpd->base_address,0,sizeof (vpd->base_address));
  memset(&vpd->bios_build_id,0,sizeof (vpd->bios_build_id));
  memset(&vpd->box_serial_number,0,sizeof (vpd->box_serial_number));
  memset(&vpd->motherboard_serial_number,0,sizeof (vpd->motherboard_serial_number));
  memset(&vpd->machine_type_model,0,sizeof (vpd->machine_type_model));
  memset(&vpd->bios_release_date,0,sizeof (vpd->bios_release_date));
  memset(&vpd->default_flash_filename,0,sizeof (vpd->default_flash_filename));
  memset(&vpd->bios_version,0,sizeof (vpd->bios_version));

  /* Until we found elements in the vpdtable, we consider them as not filled */
  vpd->filled=false;

  p=(char *)0xF0000; /* The start address to look at the dmi table */
  for (q = p; q < p + 0x10000; q +=4) {
        memcpy(buf, q, 5);
        if(memcmp(buf, "\252\125VPD", 5)==0) {
	     snprintf(&vpd->base_address,5,"%X",q);
             if (q[5] < 0x30)
                 return -ENOVPDTABLE;

  	     vpd->filled=true;
             /* XSeries have longer records, exact length seems to vary. */
             if (!(q[5] >= 0x45 && vpd_checksum(q, q[5]))
               /* Some Netvista seem to work with this. */
               && !(vpd_checksum(q, 0x30))
               /* The Thinkpad/Thinkcentre checksum does *not* include the first 13 bytes. */
               && !(vpd_checksum(q + 0x0D, 0x30 - 0x0D)))
        	{
                /* A few systems have a bad checksum (xSeries 325, 330, 335
                   and 345 with early BIOS) but the record is otherwise
                   valid. */
                        printf("VPD: Bad checksum!\n");
        	}

             strncpy(vpd->bios_build_id,q+0x0D, 9);
             strncpy(vpd->box_serial_number,q+0x16, 7);
             strncpy(vpd->motherboard_serial_number,q+0x1D, 11);
             strncpy(vpd->machine_type_model,q+0x28, 7);

	     if (q[5] < 0x44)
                return VPD_TABLE_PRESENT;

             strncpy(vpd->bios_release_date,q+0x30, 8);
             strncpy(vpd->default_flash_filename,q+0x38, 12);

	     if (q[5] >= 0x46 && q[0x44] != 0x00) {
	             strncpy(vpd->bios_version,q+0x44, 255);
	     }

	      return VPD_TABLE_PRESENT;
         }
  }
  return -ENOVPDTABLE;
}


