| /* |
| * Copyright (c) 1998 Robert Nordier |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS |
| * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
| * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <sys/mount.h> |
| #include <sys/param.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| |
| #include <ctype.h> |
| #include <err.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <paths.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include "mkfs_msdos.h" |
| |
| #define MAXU16 0xffff /* maximum unsigned 16-bit quantity */ |
| #define BPN 4 /* bits per nibble */ |
| #define NPB 2 /* nibbles per byte */ |
| |
| #define DOSMAGIC 0xaa55 /* DOS magic number */ |
| #define MINBPS 512 /* minimum bytes per sector */ |
| #define MAXSPC 128 /* maximum sectors per cluster */ |
| #define MAXNFT 16 /* maximum number of FATs */ |
| #define DEFBLK 4096 /* default block size */ |
| #define DEFBLK16 2048 /* default block size FAT16 */ |
| #define DEFRDE 512 /* default root directory entries */ |
| #define RESFTE 2 /* reserved FAT entries */ |
| #define MINCLS12 1U /* minimum FAT12 clusters */ |
| #define MINCLS16 0xff5U /* minimum FAT16 clusters */ |
| #define MINCLS32 0xfff5U /* minimum FAT32 clusters */ |
| #define MAXCLS12 0xff4U /* maximum FAT12 clusters */ |
| #define MAXCLS16 0xfff4U /* maximum FAT16 clusters */ |
| #define MAXCLS32 0xffffff4U /* maximum FAT32 clusters */ |
| |
| #define mincls(fat) ((fat) == 12 ? MINCLS12 : (fat) == 16 ? MINCLS16 : MINCLS32) |
| |
| #define maxcls(fat) ((fat) == 12 ? MAXCLS12 : (fat) == 16 ? MAXCLS16 : MAXCLS32) |
| |
| #define mk1(p, x) (p) = (uint8_t)(x) |
| |
| #define mk2(p, x) (p)[0] = (uint8_t)(x), (p)[1] = (uint8_t)((x) >> 010) |
| |
| #define mk4(p, x) \ |
| (p)[0] = (uint8_t)(x), (p)[1] = (uint8_t)((x) >> 010), \ |
| (p)[2] = (uint8_t)((x) >> 020), (p)[3] = (uint8_t)((x) >> 030) |
| |
| struct bs { |
| uint8_t bsJump[3]; /* bootstrap entry point */ |
| uint8_t bsOemName[8]; /* OEM name and version */ |
| } __attribute__((packed)); |
| |
| struct bsbpb { |
| uint8_t bpbBytesPerSec[2]; /* bytes per sector */ |
| uint8_t bpbSecPerClust; /* sectors per cluster */ |
| uint8_t bpbResSectors[2]; /* reserved sectors */ |
| uint8_t bpbFATs; /* number of FATs */ |
| uint8_t bpbRootDirEnts[2]; /* root directory entries */ |
| uint8_t bpbSectors[2]; /* total sectors */ |
| uint8_t bpbMedia; /* media descriptor */ |
| uint8_t bpbFATsecs[2]; /* sectors per FAT */ |
| uint8_t bpbSecPerTrack[2]; /* sectors per track */ |
| uint8_t bpbHeads[2]; /* drive heads */ |
| uint8_t bpbHiddenSecs[4]; /* hidden sectors */ |
| uint8_t bpbHugeSectors[4]; /* big total sectors */ |
| } __attribute__((packed)); |
| |
| struct bsxbpb { |
| uint8_t bpbBigFATsecs[4]; /* big sectors per FAT */ |
| uint8_t bpbExtFlags[2]; /* FAT control flags */ |
| uint8_t bpbFSVers[2]; /* file system version */ |
| uint8_t bpbRootClust[4]; /* root directory start cluster */ |
| uint8_t bpbFSInfo[2]; /* file system info sector */ |
| uint8_t bpbBackup[2]; /* backup boot sector */ |
| uint8_t bpbReserved[12]; /* reserved */ |
| } __attribute__((packed)); |
| |
| struct bsx { |
| uint8_t exDriveNumber; /* drive number */ |
| uint8_t exReserved1; /* reserved */ |
| uint8_t exBootSignature; /* extended boot signature */ |
| uint8_t exVolumeID[4]; /* volume ID number */ |
| uint8_t exVolumeLabel[11]; /* volume label */ |
| uint8_t exFileSysType[8]; /* file system type */ |
| } __attribute__((packed)); |
| |
| struct de { |
| uint8_t deName[11]; /* name and extension */ |
| uint8_t deAttributes; /* attributes */ |
| uint8_t rsvd[10]; /* reserved */ |
| uint8_t deMTime[2]; /* last-modified time */ |
| uint8_t deMDate[2]; /* last-modified date */ |
| uint8_t deStartCluster[2]; /* starting cluster */ |
| uint8_t deFileSize[4]; /* size */ |
| } __attribute__((packed)); |
| |
| struct bpb { |
| uint32_t bpbBytesPerSec; /* bytes per sector */ |
| uint32_t bpbSecPerClust; /* sectors per cluster */ |
| uint32_t bpbResSectors; /* reserved sectors */ |
| uint32_t bpbFATs; /* number of FATs */ |
| uint32_t bpbRootDirEnts; /* root directory entries */ |
| uint32_t bpbSectors; /* total sectors */ |
| uint32_t bpbMedia; /* media descriptor */ |
| uint32_t bpbFATsecs; /* sectors per FAT */ |
| uint32_t bpbSecPerTrack; /* sectors per track */ |
| uint32_t bpbHeads; /* drive heads */ |
| uint32_t bpbHiddenSecs; /* hidden sectors */ |
| uint32_t bpbHugeSectors; /* big total sectors */ |
| uint32_t bpbBigFATsecs; /* big sectors per FAT */ |
| uint32_t bpbRootClust; /* root directory start cluster */ |
| uint32_t bpbFSInfo; /* file system info sector */ |
| uint32_t bpbBackup; /* backup boot sector */ |
| }; |
| |
| static const uint8_t bootcode[] = { |
| 0xfa, /* cli */ |
| 0x31, 0xc0, /* xor ax,ax */ |
| 0x8e, 0xd0, /* mov ss,ax */ |
| 0xbc, 0x00, 0x7c, /* mov sp,7c00h */ |
| 0xfb, /* sti */ |
| 0x8e, 0xd8, /* mov ds,ax */ |
| 0xe8, 0x00, 0x00, /* call $ + 3 */ |
| 0x5e, /* pop si */ |
| 0x83, 0xc6, 0x19, /* add si,+19h */ |
| 0xbb, 0x07, 0x00, /* mov bx,0007h */ |
| 0xfc, /* cld */ |
| 0xac, /* lodsb */ |
| 0x84, 0xc0, /* test al,al */ |
| 0x74, 0x06, /* jz $ + 8 */ |
| 0xb4, 0x0e, /* mov ah,0eh */ |
| 0xcd, 0x10, /* int 10h */ |
| 0xeb, 0xf5, /* jmp $ - 9 */ |
| 0x30, 0xe4, /* xor ah,ah */ |
| 0xcd, 0x16, /* int 16h */ |
| 0xcd, 0x19, /* int 19h */ |
| 0x0d, 0x0a, 'N', 'o', 'n', '-', 's', 'y', 's', 't', 'e', 'm', |
| ' ', 'd', 'i', 's', 'k', 0x0d, 0x0a, 'P', 'r', 'e', 's', 's', |
| ' ', 'a', 'n', 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o', ' ', |
| 'r', 'e', 'b', 'o', 'o', 't', 0x0d, 0x0a, 0}; |
| |
| static int getdiskinfo(int, const char*, off_t, struct bpb*); |
| static void print_bpb(struct bpb*); |
| static void mklabel(uint8_t*, const char*); |
| static int oklabel(const char*); |
| static void setstr(uint8_t*, const char*, size_t); |
| |
| int mkfs_msdos(const char* fname, const struct msdos_options* op) { |
| char buf[MAXPATHLEN]; |
| struct stat sb; |
| struct timeval tv; |
| struct bpb bpb; |
| struct tm* tm; |
| struct bs* bs; |
| struct bsbpb* bsbpb; |
| struct bsxbpb* bsxbpb; |
| struct bsx* bsx; |
| struct de* de; |
| uint8_t* img; |
| const char* bname; |
| ssize_t n; |
| time_t now; |
| uint32_t fat, bss, rds, cls, dir, lsn, x, x1, x2; |
| int fd, fd1, rv; |
| struct msdos_options o = *op; |
| |
| img = NULL; |
| rv = -1; |
| |
| if (o.block_size && o.sectors_per_cluster) { |
| warnx("Cannot specify both block size and sectors per cluster"); |
| goto done; |
| } |
| if (o.OEM_string && strlen(o.OEM_string) > 8) { |
| warnx("%s: bad OEM string", o.OEM_string); |
| goto done; |
| } |
| if (o.create_size) { |
| if (o.no_create) { |
| warnx("create (-C) is incompatible with -N"); |
| goto done; |
| } |
| fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644); |
| if (fd == -1) { |
| warnx("failed to create %s", fname); |
| goto done; |
| } |
| if (ftruncate(fd, o.create_size)) { |
| warnx("failed to initialize %jd bytes", (intmax_t)o.create_size); |
| goto done; |
| } |
| } else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1) { |
| warn("%s", fname); |
| goto done; |
| } |
| if (fstat(fd, &sb)) { |
| warn("%s", fname); |
| goto done; |
| } |
| if (o.create_size) { |
| if (!S_ISREG(sb.st_mode)) |
| warnx("warning, %s is not a regular file", fname); |
| } else { |
| if (o.disk_size != -1 && !S_ISCHR(sb.st_mode)) |
| warnx("warning, %s is not a character device", fname); |
| } |
| if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) { |
| warnx("cannot seek to %jd", (intmax_t)o.offset); |
| goto done; |
| } |
| memset(&bpb, 0, sizeof(bpb)); |
| getdiskinfo(fd, fname, o.disk_size, &bpb); |
| bpb.bpbHugeSectors -= (o.offset / bpb.bpbBytesPerSec); |
| if (bpb.bpbSecPerClust == 0) { /* set defaults */ |
| if (bpb.bpbHugeSectors <= 6000) /* about 3MB -> 512 bytes */ |
| bpb.bpbSecPerClust = 1; |
| else if (bpb.bpbHugeSectors <= (1 << 17)) /* 64M -> 4k */ |
| bpb.bpbSecPerClust = 8; |
| else if (bpb.bpbHugeSectors <= (1 << 19)) /* 256M -> 8k */ |
| bpb.bpbSecPerClust = 16; |
| else if (bpb.bpbHugeSectors <= (1 << 21)) /* 1G -> 16k */ |
| bpb.bpbSecPerClust = 32; |
| else |
| bpb.bpbSecPerClust = 64; /* otherwise 32k */ |
| } |
| if (!powerof2(bpb.bpbBytesPerSec)) { |
| warnx("bytes/sector (%u) is not a power of 2", bpb.bpbBytesPerSec); |
| goto done; |
| } |
| if (bpb.bpbBytesPerSec < MINBPS) { |
| warnx("bytes/sector (%u) is too small; minimum is %u", bpb.bpbBytesPerSec, |
| MINBPS); |
| goto done; |
| } |
| |
| if (o.volume_label && !oklabel(o.volume_label)) { |
| warnx("%s: bad volume label", o.volume_label); |
| goto done; |
| } |
| if (!(fat = o.fat_type)) { |
| if (!o.directory_entries && (o.info_sector || o.backup_sector)) |
| fat = 32; |
| } |
| if ((fat == 32 && o.directory_entries) || |
| (fat != 32 && (o.info_sector || o.backup_sector))) { |
| warnx("-%c is not a legal FAT%s option", |
| fat == 32 ? 'e' : o.info_sector ? 'i' : 'k', |
| fat == 32 ? "32" : "12/16"); |
| goto done; |
| } |
| if (fat != 0 && fat != 12 && fat != 16 && fat != 32) { |
| warnx("%d: bad FAT type", fat); |
| goto done; |
| } |
| |
| if (o.block_size) { |
| if (!powerof2(o.block_size)) { |
| warnx("block size (%u) is not a power of 2", o.block_size); |
| goto done; |
| } |
| if (o.block_size < bpb.bpbBytesPerSec) { |
| warnx("block size (%u) is too small; minimum is %u", o.block_size, |
| bpb.bpbBytesPerSec); |
| goto done; |
| } |
| if (o.block_size > bpb.bpbBytesPerSec * MAXSPC) { |
| warnx("block size (%u) is too large; maximum is %u", o.block_size, |
| bpb.bpbBytesPerSec * MAXSPC); |
| goto done; |
| } |
| bpb.bpbSecPerClust = o.block_size / bpb.bpbBytesPerSec; |
| } |
| if (o.sectors_per_cluster) { |
| if (!powerof2(o.sectors_per_cluster)) { |
| warnx("sectors/cluster (%u) is not a power of 2", o.sectors_per_cluster); |
| goto done; |
| } |
| bpb.bpbSecPerClust = o.sectors_per_cluster; |
| } |
| if (o.reserved_sectors) |
| bpb.bpbResSectors = o.reserved_sectors; |
| if (o.num_FAT) { |
| if (o.num_FAT > MAXNFT) { |
| warnx("number of FATs (%u) is too large; maximum is %u", o.num_FAT, |
| MAXNFT); |
| goto done; |
| } |
| bpb.bpbFATs = o.num_FAT; |
| } |
| if (o.directory_entries) |
| bpb.bpbRootDirEnts = o.directory_entries; |
| if (o.media_descriptor_set) { |
| if (o.media_descriptor < 0xf0) { |
| warnx("illegal media descriptor (%#x)", o.media_descriptor); |
| goto done; |
| } |
| bpb.bpbMedia = o.media_descriptor; |
| } |
| if (o.sectors_per_fat) |
| bpb.bpbBigFATsecs = o.sectors_per_fat; |
| if (o.info_sector) |
| bpb.bpbFSInfo = o.info_sector; |
| if (o.backup_sector) |
| bpb.bpbBackup = o.backup_sector; |
| bss = 1; |
| bname = NULL; |
| fd1 = -1; |
| if (o.bootstrap) { |
| bname = o.bootstrap; |
| if (!strchr(bname, '/')) { |
| snprintf(buf, sizeof(buf), "/boot/%s", bname); |
| if (!(bname = strdup(buf))) { |
| warn(NULL); |
| goto done; |
| } |
| } |
| if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) { |
| warn("%s", bname); |
| goto done; |
| } |
| if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bpbBytesPerSec || |
| sb.st_size < bpb.bpbBytesPerSec || |
| sb.st_size > bpb.bpbBytesPerSec * MAXU16) { |
| warnx("%s: inappropriate file type or format", bname); |
| goto done; |
| } |
| bss = sb.st_size / bpb.bpbBytesPerSec; |
| } |
| if (!bpb.bpbFATs) |
| bpb.bpbFATs = 2; |
| if (!fat) { |
| if (bpb.bpbHugeSectors < |
| (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + |
| howmany((RESFTE + (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1)) * |
| (bpb.bpbSecPerClust ? 16 : 12) / BPN, |
| bpb.bpbBytesPerSec * NPB) * |
| bpb.bpbFATs + |
| howmany(bpb.bpbRootDirEnts ? bpb.bpbRootDirEnts : DEFRDE, |
| bpb.bpbBytesPerSec / sizeof(struct de)) + |
| (bpb.bpbSecPerClust ? MINCLS16 : MAXCLS12 + 1) * |
| (bpb.bpbSecPerClust ? bpb.bpbSecPerClust |
| : howmany(DEFBLK, bpb.bpbBytesPerSec))) |
| fat = 12; |
| else if (bpb.bpbRootDirEnts || |
| bpb.bpbHugeSectors < |
| (bpb.bpbResSectors ? bpb.bpbResSectors : bss) + |
| howmany((RESFTE + MAXCLS16) * 2, bpb.bpbBytesPerSec) * |
| bpb.bpbFATs + |
| howmany(DEFRDE, bpb.bpbBytesPerSec / sizeof(struct de)) + |
| (MAXCLS16 + 1) * (bpb.bpbSecPerClust |
| ? bpb.bpbSecPerClust |
| : howmany(8192, bpb.bpbBytesPerSec))) |
| fat = 16; |
| else |
| fat = 32; |
| } |
| x = bss; |
| if (fat == 32) { |
| if (!bpb.bpbFSInfo) { |
| if (x == MAXU16 || x == bpb.bpbBackup) { |
| warnx("no room for info sector"); |
| goto done; |
| } |
| bpb.bpbFSInfo = x; |
| } |
| if (bpb.bpbFSInfo != MAXU16 && x <= bpb.bpbFSInfo) |
| x = bpb.bpbFSInfo + 1; |
| if (!bpb.bpbBackup) { |
| if (x == MAXU16) { |
| warnx("no room for backup sector"); |
| goto done; |
| } |
| bpb.bpbBackup = x; |
| } else if (bpb.bpbBackup != MAXU16 && bpb.bpbBackup == bpb.bpbFSInfo) { |
| warnx("backup sector would overwrite info sector"); |
| goto done; |
| } |
| if (bpb.bpbBackup != MAXU16 && x <= bpb.bpbBackup) |
| x = bpb.bpbBackup + 1; |
| } |
| if (!bpb.bpbResSectors) |
| bpb.bpbResSectors = |
| fat == 32 ? MAX(x, MAX(16384 / bpb.bpbBytesPerSec, 4)) : x; |
| else if (bpb.bpbResSectors < x) { |
| warnx("too few reserved sectors (need %d have %d)", x, bpb.bpbResSectors); |
| goto done; |
| } |
| if (fat != 32 && !bpb.bpbRootDirEnts) |
| bpb.bpbRootDirEnts = DEFRDE; |
| rds = howmany(bpb.bpbRootDirEnts, bpb.bpbBytesPerSec / sizeof(struct de)); |
| if (!bpb.bpbSecPerClust) |
| for (bpb.bpbSecPerClust = |
| howmany(fat == 16 ? DEFBLK16 : DEFBLK, bpb.bpbBytesPerSec); |
| bpb.bpbSecPerClust < MAXSPC && |
| bpb.bpbResSectors + |
| howmany((RESFTE + maxcls(fat)) * (fat / BPN), |
| bpb.bpbBytesPerSec * NPB) * |
| bpb.bpbFATs + |
| rds + (uint64_t)(maxcls(fat) + 1) * bpb.bpbSecPerClust <= |
| bpb.bpbHugeSectors; |
| bpb.bpbSecPerClust <<= 1) |
| continue; |
| if (fat != 32 && bpb.bpbBigFATsecs > MAXU16) { |
| warnx("too many sectors/FAT for FAT12/16"); |
| goto done; |
| } |
| x1 = bpb.bpbResSectors + rds; |
| x = bpb.bpbBigFATsecs ? bpb.bpbBigFATsecs : 1; |
| if (x1 + (uint64_t)x * bpb.bpbFATs > bpb.bpbHugeSectors) { |
| warnx("meta data exceeds file system size"); |
| goto done; |
| } |
| x1 += x * bpb.bpbFATs; |
| x = (uint64_t)(bpb.bpbHugeSectors - x1) * bpb.bpbBytesPerSec * NPB / |
| (bpb.bpbSecPerClust * bpb.bpbBytesPerSec * NPB + fat / BPN * bpb.bpbFATs); |
| x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN), |
| bpb.bpbBytesPerSec * NPB); |
| if (!bpb.bpbBigFATsecs) { |
| bpb.bpbBigFATsecs = x2; |
| x1 += (bpb.bpbBigFATsecs - 1) * bpb.bpbFATs; |
| } |
| cls = (bpb.bpbHugeSectors - x1) / bpb.bpbSecPerClust; |
| x = (uint64_t)bpb.bpbBigFATsecs * bpb.bpbBytesPerSec * NPB / (fat / BPN) - |
| RESFTE; |
| if (cls > x) |
| cls = x; |
| if (bpb.bpbBigFATsecs < x2) |
| warnx("warning: sectors/FAT limits file system to %u clusters", cls); |
| if (cls < mincls(fat)) { |
| warnx("%u clusters too few clusters for FAT%u, need %u", cls, fat, |
| mincls(fat)); |
| goto done; |
| } |
| if (cls > maxcls(fat)) { |
| cls = maxcls(fat); |
| bpb.bpbHugeSectors = x1 + (cls + 1) * bpb.bpbSecPerClust - 1; |
| warnx("warning: FAT type limits file system to %u sectors", |
| bpb.bpbHugeSectors); |
| } |
| printf( |
| "%s: %u sector%s in %u FAT%u cluster%s " |
| "(%u bytes/cluster)\n", |
| fname, cls * bpb.bpbSecPerClust, cls * bpb.bpbSecPerClust == 1 ? "" : "s", |
| cls, fat, cls == 1 ? "" : "s", bpb.bpbBytesPerSec * bpb.bpbSecPerClust); |
| if (!bpb.bpbMedia) |
| bpb.bpbMedia = !bpb.bpbHiddenSecs ? 0xf0 : 0xf8; |
| if (fat == 32) |
| bpb.bpbRootClust = RESFTE; |
| if (bpb.bpbHugeSectors <= MAXU16) { |
| bpb.bpbSectors = bpb.bpbHugeSectors; |
| bpb.bpbHugeSectors = 0; |
| } |
| if (fat != 32) { |
| bpb.bpbFATsecs = bpb.bpbBigFATsecs; |
| bpb.bpbBigFATsecs = 0; |
| } |
| print_bpb(&bpb); |
| if (!o.no_create) { |
| if (o.timestamp_set) { |
| tv.tv_sec = now = o.timestamp; |
| tv.tv_usec = 0; |
| tm = gmtime(&now); |
| } else { |
| gettimeofday(&tv, NULL); |
| now = tv.tv_sec; |
| tm = localtime(&now); |
| } |
| |
| if (!(img = malloc(bpb.bpbBytesPerSec))) { |
| warn(NULL); |
| goto done; |
| } |
| dir = bpb.bpbResSectors + |
| (bpb.bpbFATsecs ? bpb.bpbFATsecs : bpb.bpbBigFATsecs) * bpb.bpbFATs; |
| for (lsn = 0; lsn < dir + (fat == 32 ? bpb.bpbSecPerClust : rds); lsn++) { |
| x = lsn; |
| if (o.bootstrap && fat == 32 && bpb.bpbBackup != MAXU16 && |
| bss <= bpb.bpbBackup && x >= bpb.bpbBackup) { |
| x -= bpb.bpbBackup; |
| if (!x && lseek(fd1, o.offset, SEEK_SET)) { |
| warn("%s", bname); |
| goto done; |
| } |
| } |
| if (o.bootstrap && x < bss) { |
| if ((n = read(fd1, img, bpb.bpbBytesPerSec)) == -1) { |
| warn("%s", bname); |
| goto done; |
| } |
| if ((unsigned)n != bpb.bpbBytesPerSec) { |
| warnx("%s: can't read sector %u", bname, x); |
| goto done; |
| } |
| } else |
| memset(img, 0, bpb.bpbBytesPerSec); |
| if (!lsn || |
| (fat == 32 && bpb.bpbBackup != MAXU16 && lsn == bpb.bpbBackup)) { |
| x1 = sizeof(struct bs); |
| bsbpb = (struct bsbpb*)(img + x1); |
| mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec); |
| mk1(bsbpb->bpbSecPerClust, bpb.bpbSecPerClust); |
| mk2(bsbpb->bpbResSectors, bpb.bpbResSectors); |
| mk1(bsbpb->bpbFATs, bpb.bpbFATs); |
| mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts); |
| mk2(bsbpb->bpbSectors, bpb.bpbSectors); |
| mk1(bsbpb->bpbMedia, bpb.bpbMedia); |
| mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs); |
| mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack); |
| mk2(bsbpb->bpbHeads, bpb.bpbHeads); |
| mk4(bsbpb->bpbHiddenSecs, bpb.bpbHiddenSecs); |
| mk4(bsbpb->bpbHugeSectors, bpb.bpbHugeSectors); |
| x1 += sizeof(struct bsbpb); |
| if (fat == 32) { |
| bsxbpb = (struct bsxbpb*)(img + x1); |
| mk4(bsxbpb->bpbBigFATsecs, bpb.bpbBigFATsecs); |
| mk2(bsxbpb->bpbExtFlags, 0); |
| mk2(bsxbpb->bpbFSVers, 0); |
| mk4(bsxbpb->bpbRootClust, bpb.bpbRootClust); |
| mk2(bsxbpb->bpbFSInfo, bpb.bpbFSInfo); |
| mk2(bsxbpb->bpbBackup, bpb.bpbBackup); |
| x1 += sizeof(struct bsxbpb); |
| } |
| bsx = (struct bsx*)(img + x1); |
| mk1(bsx->exDriveNumber, 0x80); |
| mk1(bsx->exBootSignature, 0x29); |
| if (o.volume_id_set) |
| x = o.volume_id; |
| else |
| x = (((uint32_t)(1 + tm->tm_mon) << 8 | (uint32_t)tm->tm_mday) + |
| ((uint32_t)tm->tm_sec << 8 | (uint32_t)(tv.tv_usec / 10))) |
| << 16 | |
| ((uint32_t)(1900 + tm->tm_year) + |
| ((uint32_t)tm->tm_hour << 8 | (uint32_t)tm->tm_min)); |
| mk4(bsx->exVolumeID, x); |
| mklabel(bsx->exVolumeLabel, |
| o.volume_label ? o.volume_label : "NO NAME"); |
| snprintf(buf, sizeof(buf), "FAT%u", fat); |
| setstr(bsx->exFileSysType, buf, sizeof(bsx->exFileSysType)); |
| if (!o.bootstrap) { |
| x1 += sizeof(struct bsx); |
| bs = (struct bs*)img; |
| mk1(bs->bsJump[0], 0xeb); |
| mk1(bs->bsJump[1], x1 - 2); |
| mk1(bs->bsJump[2], 0x90); |
| setstr(bs->bsOemName, o.OEM_string ? o.OEM_string : "BSD4.4 ", |
| sizeof(bs->bsOemName)); |
| memcpy(img + x1, bootcode, sizeof(bootcode)); |
| mk2(img + MINBPS - 2, DOSMAGIC); |
| } |
| } else if (fat == 32 && bpb.bpbFSInfo != MAXU16 && |
| (lsn == bpb.bpbFSInfo || |
| (bpb.bpbBackup != MAXU16 && |
| lsn == bpb.bpbBackup + bpb.bpbFSInfo))) { |
| mk4(img, 0x41615252); |
| mk4(img + MINBPS - 28, 0x61417272); |
| mk4(img + MINBPS - 24, 0xffffffff); |
| mk4(img + MINBPS - 20, bpb.bpbRootClust); |
| mk2(img + MINBPS - 2, DOSMAGIC); |
| } else if (lsn >= bpb.bpbResSectors && lsn < dir && |
| !((lsn - bpb.bpbResSectors) % |
| (bpb.bpbFATsecs ? bpb.bpbFATsecs : bpb.bpbBigFATsecs))) { |
| mk1(img[0], bpb.bpbMedia); |
| for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++) |
| mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff); |
| } else if (lsn == dir && o.volume_label) { |
| de = (struct de*)img; |
| mklabel(de->deName, o.volume_label); |
| mk1(de->deAttributes, 050); |
| x = (uint32_t)tm->tm_hour << 11 | (uint32_t)tm->tm_min << 5 | |
| (uint32_t)tm->tm_sec >> 1; |
| mk2(de->deMTime, x); |
| x = (uint32_t)(tm->tm_year - 80) << 9 | |
| (uint32_t)(tm->tm_mon + 1) << 5 | (uint32_t)tm->tm_mday; |
| mk2(de->deMDate, x); |
| } |
| if ((n = write(fd, img, bpb.bpbBytesPerSec)) == -1) { |
| warn("%s", fname); |
| goto done; |
| } |
| if ((unsigned)n != bpb.bpbBytesPerSec) { |
| warnx("%s: can't write sector %u", fname, lsn); |
| goto done; |
| } |
| } |
| } |
| rv = 0; |
| done: |
| free(img); |
| |
| return rv; |
| } |
| |
| /* |
| * Get disk slice, partition, and geometry information. |
| */ |
| static int getdiskinfo(int fd, const char* fname, off_t disk_size, struct bpb* bpb) { |
| off_t ms = disk_size; |
| |
| if (ms < 1) { |
| struct stat st; |
| if (fstat(fd, &st)) |
| err(1, "cannot get disk size"); |
| ms = st.st_size; |
| } |
| /* create a fake geometry for a file image */ |
| bpb->bpbBytesPerSec = 512; |
| bpb->bpbSecPerTrack = 63; |
| bpb->bpbHeads = 255; |
| bpb->bpbHugeSectors = ms / bpb->bpbBytesPerSec; |
| bpb->bpbHiddenSecs = 0; |
| return 0; |
| } |
| |
| /* |
| * Print out BPB values. |
| */ |
| static void print_bpb(struct bpb* bpb) { |
| printf("BytesPerSec=%u SecPerClust=%u ResSectors=%u FATs=%u", |
| bpb->bpbBytesPerSec, bpb->bpbSecPerClust, bpb->bpbResSectors, |
| bpb->bpbFATs); |
| if (bpb->bpbRootDirEnts) |
| printf(" RootDirEnts=%u", bpb->bpbRootDirEnts); |
| if (bpb->bpbSectors) |
| printf(" Sectors=%u", bpb->bpbSectors); |
| printf(" Media=%#x", bpb->bpbMedia); |
| if (bpb->bpbFATsecs) |
| printf(" FATsecs=%u", bpb->bpbFATsecs); |
| printf(" SecPerTrack=%u Heads=%u HiddenSecs=%u", bpb->bpbSecPerTrack, |
| bpb->bpbHeads, bpb->bpbHiddenSecs); |
| if (bpb->bpbHugeSectors) |
| printf(" HugeSectors=%u", bpb->bpbHugeSectors); |
| if (!bpb->bpbFATsecs) { |
| printf(" FATsecs=%u RootCluster=%u", bpb->bpbBigFATsecs, bpb->bpbRootClust); |
| printf(" FSInfo="); |
| printf(bpb->bpbFSInfo == MAXU16 ? "%#x" : "%u", bpb->bpbFSInfo); |
| printf(" Backup="); |
| printf(bpb->bpbBackup == MAXU16 ? "%#x" : "%u", bpb->bpbBackup); |
| } |
| printf("\n"); |
| } |
| |
| /* |
| * Check a volume label. |
| */ |
| static int oklabel(const char* src) { |
| int c, i; |
| |
| for (i = 0; i <= 11; i++) { |
| c = (unsigned char)*src++; |
| if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c)) |
| break; |
| } |
| return i && !c; |
| } |
| |
| /* |
| * Make a volume label. |
| */ |
| static void mklabel(uint8_t* dest, const char* src) { |
| int c, i; |
| |
| for (i = 0; i < 11; i++) { |
| c = *src ? toupper(*src++) : ' '; |
| *dest++ = !i && c == '\xe5' ? 5 : c; |
| } |
| } |
| |
| /* |
| * Copy string, padding with spaces. |
| */ |
| static void setstr(uint8_t* dest, const char* src, size_t len) { |
| while (len--) |
| *dest++ = *src ? *src++ : ' '; |
| } |