diff options
Diffstat (limited to 'contrib/syslinux/latest/com32/gpllib/disk/msdos.c')
| -rw-r--r-- | contrib/syslinux/latest/com32/gpllib/disk/msdos.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/contrib/syslinux/latest/com32/gpllib/disk/msdos.c b/contrib/syslinux/latest/com32/gpllib/disk/msdos.c deleted file mode 100644 index affec43..0000000 --- a/contrib/syslinux/latest/com32/gpllib/disk/msdos.c +++ /dev/null @@ -1,162 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2009 Pierre-Alexandre Meyer - * - * Some parts borrowed from chain.c32: - * - * Copyright 2003-2009 H. Peter Anvin - All Rights Reserved - * Copyright 2009 Intel Corporation; author: H. Peter Anvin - * - * This file is part of Syslinux, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -#include <stdlib.h> - -#include <disk/common.h> -#include <disk/geom.h> -#include <disk/msdos.h> -#include <disk/partition.h> -#include <disk/read.h> - -static inline int is_extended_partition(struct part_entry *ptab) -{ - return (ptab->ostype == 0x05 || - ptab->ostype == 0x0f || ptab->ostype == 0x85); -} - -static inline int msdos_magic_present(const char *ptab) -{ - return (*(uint16_t *) (ptab + 0x1fe) == 0xaa55); -} - -/** - * process_extended_partition - execute a callback for each partition contained listed in an ebr - * @drive_info: driveinfo struct describing the drive - * @partition_offset: Absolute start (lba) of the extended partition - * @ebr_offset: Relative start (lba) of the current ebr processed within - * the extended partition - * @callback: Callback to execute - * @error: Buffer for I/O errors - * @nb_part_seen: Number of partitions found on the disk so far - **/ -static int process_extended_partition(struct driveinfo *drive_info, - const int partition_offset, - const int ebr_offset, - p_callback callback, int nb_part_seen) -{ - int status = 0; - /* The ebr is located at the first sector of the extended partition */ - char *ebr = malloc(SECTOR * sizeof(char)); - - if (read_sectors(drive_info, ebr, partition_offset + ebr_offset, 1) == -1) - goto abort; - - /* Check msdos magic signature */ - if (!msdos_magic_present(ebr)) - goto abort; - - struct part_entry *ptab = - (struct part_entry *)(ebr + PARTITION_TABLES_OFFSET); - - for (int i = 0; i < 4; i++) { - if (status == -1) - goto abort; - - if (!is_extended_partition(&ptab[i])) { - /* - * This EBR partition table entry points to the - * logical partition associated to that EBR - */ - int logical_partition_start = ebr_offset + ptab[i].start_lba; - - /* Last EBR in the extended partition? */ - if (!logical_partition_start) - continue; - - /* - * Check for garbage: - * 3rd and 4th entries in an EBR should be zero - * Some (malformed) partitioning software still add some - * data partitions there. - */ - if (ptab[i].start_lba <= 0 || ptab[i].length <= 0) - continue; - - nb_part_seen++; - callback(drive_info, - &ptab[i], - partition_offset + logical_partition_start, nb_part_seen); - } else - status = process_extended_partition(drive_info, - partition_offset, - ptab[i].start_lba, - callback, nb_part_seen); - } - - free(ebr); - return 0; - -abort: - free(ebr); - return -1; -} - -/** - * process_mbr - execute a callback for each partition contained in an {m,e}br - * @drive_info: driveinfo struct describing the drive - * @ptab: Pointer to the partition table - * @callback: Callback to execute - **/ -static int process_mbr(struct driveinfo *drive_info, struct part_entry *ptab, - p_callback callback) -{ - int status = 0; - - for (int i = 0; i < 4; i++) { - if (status == -1) - return -1; - - if (ptab[i].start_sect > 0) { - if (is_extended_partition(&ptab[i])) { - callback(drive_info, &ptab[i], ptab[i].start_lba, i + 1); - status = - process_extended_partition(drive_info, ptab[i].start_lba, 0, - callback, 4); - } else - callback(drive_info, &ptab[i], ptab[i].start_lba, i + 1); - } - } - - return 0; -} - -/** - * parse_partition_table - execute a callback for each partition entry - * @d: driveinfo struct describing the drive - * @callback: Callback to execute - * - * The signature of the callback should be the following: - * - * void callback(struct driveinfo *drive_info, - * struct part_entry *ptab, - * int offset_root, - * int nb_part_seen) - **/ -int parse_partition_table(struct driveinfo *d, p_callback callback) -{ - char *mbr = malloc(SECTOR * sizeof(char)); - - if (read_mbr(d->disk, mbr) == -1) - return -1; - else { - /* Check msdos magic signature */ - if (!msdos_magic_present(mbr)) - return -1; - - struct part_entry *ptab = - (struct part_entry *)(mbr + PARTITION_TABLES_OFFSET); - return process_mbr(d, ptab, callback); - } -} |