mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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c4e92af85a
1. Check for potential integer overflow in sector_bytes * sector_count. 2. Added O_NOFOLLOW to open() call - Is this enough? 3. Passing buffer length to GuidToStr(), PMBRToStr(). 4. Use unsigned int in GetEntry() to determine stride. 5. Address conversion between UTF16 and UTF8. Note: The UTF conversion is complex and troublesome, and needs careful consideration to get right. For now, I've just forced the interpretation of the partition name to 7-bit ASCII. That's sufficient for the needs of Chrome OS, and I can file a new issue to handle UTF correctly. BUG=chrome-os-partner:705 TEST=manual Running "make runtests" invokes the tests/run_cgpt_tests.sh script, which checks the behavior and output of the cgpt tool. Review URL: http://codereview.chromium.org/3594010 Change-Id: I5fd29796d8c929527e0cfbc6d5ccbcdc77502c6b
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "cgpt.h"
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <uuid/uuid.h>
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#include "cgptlib_internal.h"
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static void Usage(void)
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{
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printf("\nUsage: %s create [OPTIONS] DRIVE\n\n"
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"Create or reset an empty GPT.\n\n"
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"Options:\n"
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" -z Zero the sectors of the GPT table and entries\n"
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"\n", progname);
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}
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int cmd_create(int argc, char *argv[]) {
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struct drive drive;
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int zap = 0;
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int c;
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int errorcnt = 0;
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opterr = 0; // quiet, you
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while ((c=getopt(argc, argv, ":hz")) != -1)
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{
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switch (c)
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{
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case 'z':
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zap = 1;
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break;
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case 'h':
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Usage();
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return CGPT_OK;
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case '?':
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Error("unrecognized option: -%c\n", optopt);
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errorcnt++;
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break;
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case ':':
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Error("missing argument to -%c\n", optopt);
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errorcnt++;
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break;
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default:
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errorcnt++;
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break;
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}
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}
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if (errorcnt)
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{
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Usage();
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return CGPT_FAILED;
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}
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if (optind >= argc) {
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Usage();
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return CGPT_FAILED;
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}
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if (CGPT_OK != DriveOpen(argv[optind], &drive))
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return CGPT_FAILED;
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// Erase the data
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memset(drive.gpt.primary_header, 0,
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drive.gpt.sector_bytes * GPT_HEADER_SECTOR);
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memset(drive.gpt.secondary_header, 0,
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drive.gpt.sector_bytes * GPT_HEADER_SECTOR);
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memset(drive.gpt.primary_entries, 0,
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drive.gpt.sector_bytes * GPT_ENTRIES_SECTORS);
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memset(drive.gpt.secondary_entries, 0,
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drive.gpt.sector_bytes * GPT_ENTRIES_SECTORS);
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drive.gpt.modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
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GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
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// Initialize a blank set
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if (!zap)
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{
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GptHeader *h = (GptHeader *)drive.gpt.primary_header;
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memcpy(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE);
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h->revision = GPT_HEADER_REVISION;
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h->size = sizeof(GptHeader);
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h->my_lba = 1;
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h->alternate_lba = drive.gpt.drive_sectors - 1;
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h->first_usable_lba = 1 + 1 + GPT_ENTRIES_SECTORS;
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h->last_usable_lba = drive.gpt.drive_sectors - 1 - GPT_ENTRIES_SECTORS - 1;
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uuid_generate((uint8_t *)&h->disk_uuid);
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h->entries_lba = 2;
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h->number_of_entries = 128;
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h->size_of_entry = sizeof(GptEntry);
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// Copy to secondary
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RepairHeader(&drive.gpt, MASK_PRIMARY);
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UpdateCrc(&drive.gpt);
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}
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// Write it all out
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return DriveClose(&drive, 1);
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}
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