diff options
Diffstat (limited to 'contrib/syslinux/latest/libinstaller/fat.c')
| -rw-r--r-- | contrib/syslinux/latest/libinstaller/fat.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/contrib/syslinux/latest/libinstaller/fat.c b/contrib/syslinux/latest/libinstaller/fat.c deleted file mode 100644 index e210135..0000000 --- a/contrib/syslinux/latest/libinstaller/fat.c +++ /dev/null @@ -1,129 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 1998-2008 H. Peter Anvin - All Rights Reserved - * Copyright 2009-2010 Intel Corporation; author H. Peter Anvin - * - * This program 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, Inc., 53 Temple Place Ste 330, - * Boston MA 02111-1307, USA; either version 2 of the License, or - * (at your option) any later version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * fat.c - Initial sanity check for FAT-based installers - */ - -#define _XOPEN_SOURCE 500 /* Required on glibc 2.x */ -#define _BSD_SOURCE -#include <stdio.h> -#include <inttypes.h> -#include <string.h> -#include <stddef.h> -#include <stdlib.h> - -#include "syslinux.h" -#include "syslxint.h" - -void syslinux_make_bootsect(void *bs) -{ - struct boot_sector *bootsect = bs; - const struct boot_sector *sbs = - (const struct boot_sector *)boot_sector; - - memcpy(&bootsect->bsHead, &sbs->bsHead, bsHeadLen); - memcpy(&bootsect->bsCode, &sbs->bsCode, bsCodeLen); -} - -/* - * Check to see that what we got was indeed an MS-DOS boot sector/superblock; - * Return NULL if OK and otherwise an error message; - */ -const char *syslinux_check_bootsect(const void *bs) -{ - int veryold; - int sectorsize; - long long sectors, fatsectors, dsectors; - long long clusters; - int rootdirents, clustersize; - const struct boot_sector *sectbuf = bs; - - veryold = 0; - - /* Must be 0xF0 or 0xF8..0xFF */ - if (get_8(§buf->bsMedia) != 0xF0 && get_8(§buf->bsMedia) < 0xF8) - return "invalid media signature (not a FAT filesystem?)"; - - sectorsize = get_16(§buf->bsBytesPerSec); - if (sectorsize == SECTOR_SIZE) - ; /* ok */ - else if (sectorsize >= 512 && sectorsize <= 4096 && - (sectorsize & (sectorsize - 1)) == 0) - return "unsupported sectors size"; - else - return "impossible sector size"; - - clustersize = get_8(§buf->bsSecPerClust); - if (clustersize == 0 || (clustersize & (clustersize - 1))) - return "impossible cluster size"; - - sectors = get_16(§buf->bsSectors); - sectors = sectors ? sectors : get_32(§buf->bsHugeSectors); - - dsectors = sectors - get_16(§buf->bsResSectors); - - fatsectors = get_16(§buf->bsFATsecs); - fatsectors = fatsectors ? fatsectors : get_32(§buf->bs32.FATSz32); - fatsectors *= get_8(§buf->bsFATs); - dsectors -= fatsectors; - - rootdirents = get_16(§buf->bsRootDirEnts); - dsectors -= (rootdirents + sectorsize / 32 - 1) / sectorsize; - - if (dsectors < 0) - return "negative number of data sectors"; - - if (fatsectors == 0) - return "zero FAT sectors"; - - clusters = dsectors / clustersize; - - if (clusters < 0xFFF5) { - /* FAT12 or FAT16 */ - - if (!get_16(§buf->bsFATsecs)) - return "zero FAT sectors (FAT12/16)"; - - if (get_8(§buf->bs16.BootSignature) == 0x29) { - if (!memcmp(§buf->bs16.FileSysType, "FAT12 ", 8)) { - if (clusters >= 0xFF5) - return "more than 4084 clusters but claims FAT12"; - } else if (!memcmp(§buf->bs16.FileSysType, "FAT16 ", 8)) { - if (clusters < 0xFF5) - return "less than 4084 clusters but claims FAT16"; - } else if (!memcmp(§buf->bs16.FileSysType, "FAT32 ", 8)) { - return "less than 65525 clusters but claims FAT32"; - } else if (memcmp(§buf->bs16.FileSysType, "FAT ", 8)) { - static char fserr[] = - "filesystem type \"????????\" not supported"; - memcpy(fserr + 17, §buf->bs16.FileSysType, 8); - return fserr; - } - } - } else if (clusters < 0x0FFFFFF5) { - /* - * FAT32... - * - * Moving the FileSysType and BootSignature was a lovely stroke - * of M$ idiocy... - */ - if (get_8(§buf->bs32.BootSignature) != 0x29 || - memcmp(§buf->bs32.FileSysType, "FAT32 ", 8)) - return "missing FAT32 signature"; - } else { - return "impossibly large number of clusters"; - } - - return NULL; -} |