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// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cgpt.h"
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <uuid/uuid.h>
#include "cgptlib_internal.h"
static void Usage(void)
{
printf("\nUsage: %s create [OPTIONS] DRIVE\n\n"
"Create or reset an empty GPT.\n\n"
"Options:\n"
" -z Zero the sectors of the GPT table and entries\n"
"\n", progname);
}
int cmd_create(int argc, char *argv[]) {
struct drive drive;
int zap = 0;
int c;
int errorcnt = 0;
opterr = 0; // quiet, you
while ((c=getopt(argc, argv, ":hz")) != -1)
{
switch (c)
{
case 'z':
zap = 1;
break;
case 'h':
Usage();
return CGPT_OK;
case '?':
Error("unrecognized option: -%c\n", optopt);
errorcnt++;
break;
case ':':
Error("missing argument to -%c\n", optopt);
errorcnt++;
break;
default:
errorcnt++;
break;
}
}
if (errorcnt)
{
Usage();
return CGPT_FAILED;
}
if (optind >= argc) {
Usage();
return CGPT_FAILED;
}
if (CGPT_OK != DriveOpen(argv[optind], &drive))
return CGPT_FAILED;
// Erase the data
memset(drive.gpt.primary_header, 0,
drive.gpt.sector_bytes * GPT_HEADER_SECTOR);
memset(drive.gpt.secondary_header, 0,
drive.gpt.sector_bytes * GPT_HEADER_SECTOR);
memset(drive.gpt.primary_entries, 0,
drive.gpt.sector_bytes * GPT_ENTRIES_SECTORS);
memset(drive.gpt.secondary_entries, 0,
drive.gpt.sector_bytes * GPT_ENTRIES_SECTORS);
drive.gpt.modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
// Initialize a blank set
if (!zap)
{
GptHeader *h = (GptHeader *)drive.gpt.primary_header;
memcpy(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE);
h->revision = GPT_HEADER_REVISION;
h->size = sizeof(GptHeader);
h->my_lba = 1;
h->alternate_lba = drive.gpt.drive_sectors - 1;
h->first_usable_lba = 1 + 1 + GPT_ENTRIES_SECTORS;
h->last_usable_lba = drive.gpt.drive_sectors - 1 - GPT_ENTRIES_SECTORS - 1;
uuid_generate((uint8_t *)&h->disk_uuid);
h->entries_lba = 2;
h->number_of_entries = 128;
h->size_of_entry = sizeof(GptEntry);
// Copy to secondary
RepairHeader(&drive.gpt, MASK_PRIMARY);
UpdateCrc(&drive.gpt);
}
// Write it all out
return DriveClose(&drive, 1);
}
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