xref: /aosp_15_r20/external/mtools/minfo.c (revision d5c9a868b113e0ec0db2f27bc2ce8a253e77c4b0)

/*  Copyright 1997-2003,2006,2007,2009 Alain Knaff.
 *  This file is part of mtools.
 *
 *  Mtools is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Mtools is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
 *
 * mlabel.c
 * Make an MSDOS volume label
 */

#include "sysincludes.h"
#include "msdos.h"
#include "mainloop.h"
#include "vfat.h"
#include "mtools.h"
#include "nameclash.h"
#include "fsP.h"

static void usage(int ret) NORETURN;
static void usage(int ret)
{
	fprintf(stderr,
		"Mtools version %s, dated %s\n", mversion, mdate);
	fprintf(stderr,
		"Usage: %s [-v] drive\n", progname);
	exit(ret);
}


static void displayInfosector(Stream_t *Stream, union bootsector *boot)
{
	InfoSector_t *infosec;

	if(WORD(ext.fat32.infoSector) == MAX16)
		return;

	infosec = (InfoSector_t *) safe_malloc(WORD(secsiz));
	force_pread(Stream, (char *) infosec,
		    (mt_off_t) WORD(secsiz) * WORD(ext.fat32.infoSector),
		    WORD(secsiz));
	printf("\nInfosector:\n");
	printf("signature=0x%08x\n", _DWORD(infosec->signature1));
	if(_DWORD(infosec->count) != MAX32)
		printf("free clusters=%u\n", _DWORD(infosec->count));
	if(_DWORD(infosec->pos) != MAX32)
		printf("last allocated cluster=%u\n", _DWORD(infosec->pos));
}

/*
 * Number of hidden sector is only a 4 byte quantity if number of sectors is
 */
static uint32_t getHidden(union bootsector *boot) {
	return WORD(psect) ? WORD(nhs) : DWORD(nhs);
}

static void displayBPB(Stream_t *Stream, union bootsector *boot) {
	struct label_blk_t *labelBlock;

	printf("bootsector information\n");
	printf("======================\n");
	printf("banner:\"%.8s\"\n", boot->boot.banner);
	printf("sector size: %d bytes\n", WORD(secsiz));
	printf("cluster size: %d sectors\n", boot->boot.clsiz);
	printf("reserved (boot) sectors: %d\n", WORD(nrsvsect));
	printf("fats: %d\n", boot->boot.nfat);
	printf("max available root directory slots: %d\n",
	       WORD(dirents));
	printf("small size: %d sectors\n", WORD(psect));
	printf("media descriptor byte: 0x%x\n", boot->boot.descr);
	printf("sectors per fat: %d\n", WORD(fatlen));
	printf("sectors per track: %d\n", WORD(nsect));
	printf("heads: %d\n", WORD(nheads));
	printf("hidden sectors: %d\n", getHidden(boot));
	if(!WORD(psect))
		printf("big size: %u sectors\n", DWORD(bigsect));

	if(WORD(fatlen)) {
		labelBlock = &boot->boot.ext.old.labelBlock;
	} else {
		labelBlock = &boot->boot.ext.fat32.labelBlock;
	}

	if(has_BPB4) {
		printf("physical drive id: 0x%x\n",
		       labelBlock->physdrive);
		printf("reserved=0x%x\n",
		       labelBlock->reserved);
		printf("dos4=0x%x\n",
		       labelBlock->dos4);
		printf("serial number: %08X\n",
		       _DWORD(labelBlock->serial));
		printf("disk label=\"%11.11s\"\n",
		       labelBlock->label);
		printf("disk type=\"%8.8s\"\n",
		       labelBlock->fat_type);
	}

	if(!WORD(fatlen)){
		printf("Big fatlen=%u\n",
		       DWORD(ext.fat32.bigFat));
		printf("Extended flags=0x%04x\n",
		       WORD(ext.fat32.extFlags));
		printf("FS version=0x%04x\n",
		       WORD(ext.fat32.fsVersion));
		printf("rootCluster=%u\n",
		       DWORD(ext.fat32.rootCluster));
		if(WORD(ext.fat32.infoSector) != MAX16)
			printf("infoSector location=%d\n",
			       WORD(ext.fat32.infoSector));
		if(WORD(ext.fat32.backupBoot) != MAX16)
			printf("backup boot sector=%d\n",
			       WORD(ext.fat32.backupBoot));
		displayInfosector(Stream, boot);
	}
}

static int try(uint32_t tot_sectors, Fs_t *masterFs, Fs_t *tryFs,
	       struct device *master_dev, struct device *try_dev,
	       uint8_t *bootDescr) {
	*tryFs = *masterFs;
	*try_dev = *master_dev;
	return calc_fs_parameters(try_dev, 0, tot_sectors,
				  tryFs, bootDescr);
}

static void print_mformat_commandline(const char *imgFile,
				      char drive,
				      struct device *dev,
				      union bootsector *boot,
				      int media,
				      int haveBPB) {
	uint8_t size_code;
	uint32_t sect_per_track;
	uint32_t hidden;
	uint32_t tot_sectors;
	int tracks_match=0;
	Fs_t masterFs, tryFs, actual;
	struct device used_dev;
	uint8_t tryMedia;
	int bad;

	sect_per_track = dev->sectors * dev->heads;
	if(sect_per_track == 0)
		return;

	tot_sectors = parseFsParams(&actual, boot,
				    media | (haveBPB ? 0x100:0),
				    sect_per_track);
	if(tot_sectors == 0)
		return;

	printf("mformat command line:\n  mformat ");

	if(haveBPB) {
		if(media == 0xf0)
			hidden = getHidden(boot);
		else
			hidden = 0;
		size_code = (uint8_t) actual.sectorShift-7;
	} else {
		size_code=2;
		hidden = 0;
	}

	if(tot_sectors ==
	   dev->tracks * sect_per_track - hidden % sect_per_track) {
		tracks_match=1;
		printf("-t %d ", dev->tracks);
	} else {
		printf("-T %d ", tot_sectors);
	}
	printf ("-h %d -s %d ", dev->heads, dev->sectors);
	if(haveBPB && (hidden || !tracks_match))
		printf("-H %d ", hidden);
	used_dev=*dev;
	if(size_code != 2) {
		printf("-S %d ",size_code);
		used_dev.ssize = size_code;
	}

	initFsForFormat(&masterFs);
	setFsSectorSize(&masterFs, &used_dev, 0);

	if(actual.num_fat != 2) {
		masterFs.num_fat = actual.num_fat;
		printf("-d %d ", actual.num_fat);
	}

	bad=try(tot_sectors, &masterFs, &tryFs, dev , &used_dev, &tryMedia);

	if(bad || actual.dir_len != tryFs.dir_len) {
		masterFs.dir_len = actual.dir_len;
		printf("-r %d ", actual.dir_len);
		bad = try(tot_sectors,
			  &masterFs, &tryFs, dev , &used_dev,
			  &tryMedia);
	}

	if(bad || actual.cluster_size != tryFs.cluster_size) {
		masterFs.cluster_size = actual.cluster_size;
		printf("-c %d ", actual.cluster_size);
		bad = try(tot_sectors,
			  &masterFs, &tryFs, dev , &used_dev,
			  &tryMedia);
	}

	if(bad || actual.fat_start != tryFs.fat_start) {
		masterFs.fat_start = actual.fat_start;
		printf("-R %d ", actual.fat_start);
		bad = try(tot_sectors,
			  &masterFs, &tryFs, dev , &used_dev,
			  &tryMedia);
	}

	if(bad || actual.fat_len != tryFs.fat_len) {
		masterFs.fat_len = actual.fat_len;
		printf("-L %d ", actual.fat_len);
		bad = try(tot_sectors,
			  &masterFs, &tryFs, dev , &used_dev,
			  &tryMedia);
	}
#ifdef HAVE_ASSERT_H
	assert(!bad);
#endif
	if((media & 0xff) != (tryMedia & 0xff))
		printf("-m %d ", (media & 0xff));

	if(actual.fat_bits == 32) {
		if(actual.backupBoot != tryFs.backupBoot)
			printf("-K %d ", actual.backupBoot);
	}

	if(imgFile != NULL)
		printf("-i \"%s\" ", imgFile);
	printf("%c:\n", ch_tolower(drive));
	printf("\n");
}


void minfo(int argc, char **argv, int type UNUSEDP) NORETURN;
void minfo(int argc, char **argv, int type UNUSEDP)
{
	union bootsector boot;

	char name[EXPAND_BUF];
	struct device dev;
	char drive;
	int verbose=0;
	int c;
	Stream_t *Stream;
	int have_drive = 0;
	int ex=0;
	char *imgFile=NULL;

	if(helpFlag(argc, argv))
		usage(0);
	while ((c = getopt(argc, argv, "i:vh")) != EOF) {
		switch (c) {
			case 'i':
				set_cmd_line_image(optarg);
				imgFile=optarg;
				break;
			case 'v':
				verbose = 1;
				break;
			case 'h':
				usage(0);
			default:
				usage(1);
		}
	}

	for(;optind <= argc; optind++) {
		int media;
		int haveBPB;

		if(optind == argc) {
			if(have_drive)
				break;
			drive = get_default_drive();
		} else {
			if(!argv[optind][0] || argv[optind][1] != ':')
				usage(1);
			drive = ch_toupper(argv[optind][0]);
		}
		have_drive = 1;

		if(! (Stream = find_device(drive, O_RDONLY, &dev, &boot,
					   name, &media, 0, NULL))) {
			fprintf(stderr, "Could not open drive %c:\n", drive);
			ex=1;
			continue;
		}

		haveBPB = media >= 0x100;
		media = media & 0xff;

		printf("device information:\n");
		printf("===================\n");
		printf("filename=\"%s\"\n", name);
		printf("sectors per track: %d\n", dev.sectors);
		printf("heads: %d\n", dev.heads);
		printf("cylinders: %d\n\n", dev.tracks);
		printf("media byte: %02x\n\n", media & 0xff);

		print_mformat_commandline(imgFile, drive,
					  &dev, &boot, media, haveBPB);

		if(haveBPB || verbose)
			displayBPB(Stream, &boot);

		if(verbose) {
			uint16_t size;
			ssize_t ssize;
			unsigned char *buf;

			printf("\n");
			size = WORD_S(secsiz);

			buf = (unsigned char *) malloc(size);
			if(!buf) {
				fprintf(stderr, "Out of memory error\n");
				exit(1);
			}

			ssize = PREADS(Stream, buf, 0, size);
			if(ssize < 0) {
				perror("read boot sector");
				exit(1);
			}

			print_sector("Boot sector hexdump", buf, (uint16_t)ssize);
		}
	}
	FREE(&Stream);
	exit(ex);
}