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#include "project.h"
#define TABLE_SIZE (((sizeof(GPT_entry)*GPT_PARITION_ENTRIES)/SECTOR_SIZE)+2)
void
header_calc_crc (GPT_header * h)
{
h->header_crc = 0;
h->header_crc = crc32 (0, h, sizeof (GPT_header));
}
GPT_header
header_new (GUID disk_guid, int lbas, int alt)
{
GPT_header ret = { 0 };
memcpy (ret.signature, GPT_HEADER_SIGNATURE, sizeof (ret.signature));
ret.revision = GPT_HEADER_REVISION_EFI10;
ret.header_size = sizeof (GPT_header);
ret.first_usable_lba = TABLE_SIZE;
ret.last_usable_lba = lbas - TABLE_SIZE;
ret.n_partition_entries = GPT_PARITION_ENTRIES;
ret.partition_entry_size = sizeof (GPT_entry);
ret.disk_guid = disk_guid;
if (!alt)
{
ret.my_lba = 1;
ret.alternate_lba = lbas - 1;
ret.partition_entry_lba = 2;
}
else
{
ret.my_lba = lbas - 1;
ret.alternate_lba = 1;
ret.partition_entry_lba = lbas - TABLE_SIZE;
}
header_calc_crc (&ret);
return ret;
}
uint32_t
header_calc_ent_crc (DISK * d, GPT_header * h)
{
int i;
GPT_entry e;
uint32_t crc = 0;
for (i = 0; i < h->n_partition_entries; ++i)
{
e=entry_read(d,h,i);
crc = crc32 (crc, &e, h->partition_entry_size);
}
return crc;
}
void
header_show (DISK *d,GPT_header *h)
{
GPT_header c=*h;
uint32_t crc;
int i;
if (h->my_lba<h->alternate_lba) {
printf(" GPT:\n");
} else {
printf(" ALTERNATE GPT:\n");
}
c.header_crc=0;
crc=crc32(0,&c,sizeof(c));
printf(" Signature %s, CRC %s\n",
(memcmp(h->signature, GPT_HEADER_SIGNATURE,sizeof(h->signature))) ? "INVALID":"valid",
(crc==h->header_crc) ?"matches":"DOES NOT MATCH");
printf (" rev=0x%08x lba=%lld alternate=%lld\n",
h->revision,
(long long) h->my_lba, (long long) h->alternate_lba);
printf (" usable lbas %lld-%lld\n",
(long long) h->first_usable_lba, (long long) h->last_usable_lba);
printf (" DISK GUID: %s\n", guid_to_a (h->disk_guid));
crc=header_calc_ent_crc(d,h);
printf (" patitions (at lba %lld) CRC %s:\n",
(long long) h->partition_entry_lba,
(crc == h->partition_entry_crc) ? "matches":"DOES NOT MATCH");
for (i=0;i<h->n_partition_entries;++i) {
GPT_entry e=entry_read(d,h,i);
if (!entry_empty(&e)) {
printf(" %d:\n",i);
entry_show(&e);
}
}
}
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