#include "project.h"


static struct known_struct
{
  GUID g;
  char *name;
} known_guids[] =
{
  {
  GUID_TYPE_EMPTY, "empty"},
  {
  GUID_TYPE_SYSTEM, "EFI SYSTEM"},
  {
  GUID_TYPE_LINUX_EXT3, "linux-ext3"},
  {
  GUID_TYPE_LINUX_SWAP, "linux-swap"},
  {
  GUID_TYPE_APPLE_HFS, "apple-hfs"},
  {
  GUID_TYPE_APPLE_TV, "apple-tv"},
  {
    {
  0}, NULL}
};


int
guid_cmp (GUID * a, GUID * b)
{
  return memcmp (a, b, sizeof (GUID));
}

#define GUIDTOARETSIZE 80
char *
guid_to_a (GUID g)
{
  char *ret = malloc (GUIDTOARETSIZE);
  struct known_struct *ptr = known_guids;

  snprintf (ret, GUIDTOARETSIZE,
            "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
            g.d[3], g.d[2], g.d[1], g.d[0], g.d[5], g.d[4], g.d[7], g.d[6],
            g.d[8], g.d[9], g.d[10], g.d[11], g.d[12], g.d[13], g.d[14],
            g.d[15]);

  while (ptr->name)
    {
      if (!guid_cmp (&g, &ptr->g))
        {
          strcat (ret, " (");
          strcat (ret, ptr->name);
          strcat (ret, ")");
        }
      ptr++;
    }

  return ret;
}

int
a_to_guid (char *a, GUID * g)
{
  struct known_struct *ptr = known_guids;
  int digit[32], ndigits = 0, i;

  while (ptr->name)
    {
      if (!strcmp (a, ptr->name)) {
        memcpy (g, &ptr->g, sizeof (GUID));
	      return 0;
	}
	ptr++;
    }

  while ((*a) && (ndigits != 32))
    {
      switch (*a)
        {
        case ' ':
        case '\t':
        case '\n':
        case '\r':
        case '-':
          break;
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
          digit[ndigits++] = (*a) - '0';
          break;
        case 'A':
        case 'B':
        case 'C':
        case 'D':
        case 'E':
        case 'F':
          digit[ndigits++] = ((*a) - 'A') + 0xA;
          break;

        case 'a':
        case 'b':
        case 'c':
        case 'd':
        case 'e':
        case 'f':
          digit[ndigits++] = ((*a) - 'a') + 0xa;
          break;
        defalt:
          return -1;
        }
    }

  for (i = 0; i < 16; ++i)
    {
      g->d[i] = (digit[(i << 1)] << 4) | digit[(i << 1) + 1];
    }

  return 0;
}


GUID
guid_random (void)
{
  GUID ret;

  int fd = open ("/dev/random", O_RDONLY);
  read (fd, &ret, sizeof (ret));
  close (fd);
  return ret;
}