| // Copyright (c) 2012 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 <string.h> |
| |
| #include "cgptlib_internal.h" |
| #include "cgpt_params.h" |
| |
| int cgpt_create(CgptCreateParams *params) { |
| struct drive drive; |
| |
| if (params == NULL) |
| return CGPT_FAILED; |
| |
| if (CGPT_OK != DriveOpen(params->drive_name, &drive, O_RDWR)) |
| 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 (!params->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; |
| if (!uuid_generator) { |
| Error("Unable to generate new GUID. uuid_generator not set.\n"); |
| goto bad; |
| } |
| (*uuid_generator)((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); |
| |
| bad: |
| |
| DriveClose(&drive, 0); |
| return CGPT_FAILED; |
| } |