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/*
 * Simple tool to dump the AP_Var contents from an EEPROM dump
 */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

uint8_t eeprom[0x1000];

#pragma pack(1)

struct EEPROM_header {
  uint16_t    magic;
  uint8_t     revision;
  uint8_t     spare;
};

static const uint16_t   k_EEPROM_magic      = 0x5041;
static const uint16_t   k_EEPROM_revision   = 2;

struct Var_header {
  uint8_t    size:6;
  uint8_t    spare:2;
  uint8_t    key;
};

static const uint8_t k_key_sentinel = 0xff;

void
fail(const char *why)
{
  fprintf(stderr, "ERROR: %s\n", why);
  exit(1);
}

int
main(int argc, char *argv[])
{
  FILE                  *fp;
  struct EEPROM_header  *header;
  struct Var_header     *var;
  unsigned              index;
  unsigned              i;

  if (argc != 2) {
    fail("missing EEPROM file name");
  }
  if (NULL == (fp = fopen(argv[1], "rb"))) {
    fail("can't open EEPROM file");
  }
  if (1 != fread(eeprom, sizeof(eeprom), 1, fp)) {
    fail("can't read EEPROM file");
  }
  fclose(fp);

  header = (struct EEPROM_header *)&eeprom[0];
  if (header->magic != k_EEPROM_magic) {
    fail("bad magic in EEPROM file");
  }
  if (header->revision != 2) {
    fail("unsupported EEPROM format revision");
  }
  printf("Header OK\n");

  index = sizeof(*header);
  for (;;) {
    var = (struct Var_header *)&eeprom[index];
    if (var->key == k_key_sentinel) {
      printf("end sentinel at %u\n", index);
      break;
    }
    printf("%04x: key %u size %d\n ", index, var->key, var->size + 1);
    index += sizeof(*var);
    for (i = 0; i <= var->size; i++) {
      printf(" %02x", eeprom[index + i]);
    }
    printf("\n");
    index += var->size + 1;
    if (index >= sizeof(eeprom)) {
      fflush(stdout);
      fail("missing end sentinel");
    }
  }
}