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/* blocklist.c - print the block list of a file */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 Free Software Foundation, Inc.
*
* GRUB 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.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/command.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* Context for grub_cmd_blocklist. */
struct blocklist_ctx
{
unsigned long start_sector;
unsigned num_sectors;
int num_entries;
grub_disk_addr_t part_start;
};
/* Helper for grub_cmd_blocklist. */
static void
print_blocklist (grub_disk_addr_t sector, unsigned num,
unsigned offset, unsigned length, struct blocklist_ctx *ctx)
{
if (ctx->num_entries++)
grub_printf (",");
grub_printf ("%llu", (unsigned long long) (sector - ctx->part_start));
if (num > 0)
grub_printf ("+%u", num);
if (offset != 0 || length != 0)
grub_printf ("[%u-%u]", offset, offset + length);
}
/* Helper for grub_cmd_blocklist. */
static void
read_blocklist (grub_disk_addr_t sector, unsigned offset, unsigned length,
void *data)
{
struct blocklist_ctx *ctx = data;
if (ctx->num_sectors > 0)
{
if (ctx->start_sector + ctx->num_sectors == sector
&& offset == 0 && length >= GRUB_DISK_SECTOR_SIZE)
{
ctx->num_sectors += length >> GRUB_DISK_SECTOR_BITS;
sector += length >> GRUB_DISK_SECTOR_BITS;
length &= (GRUB_DISK_SECTOR_SIZE - 1);
}
if (!length)
return;
print_blocklist (ctx->start_sector, ctx->num_sectors, 0, 0, ctx);
ctx->num_sectors = 0;
}
if (offset)
{
unsigned l = length + offset;
l &= (GRUB_DISK_SECTOR_SIZE - 1);
l -= offset;
print_blocklist (sector, 0, offset, l, ctx);
length -= l;
sector++;
offset = 0;
}
if (!length)
return;
if (length & (GRUB_DISK_SECTOR_SIZE - 1))
{
if (length >> GRUB_DISK_SECTOR_BITS)
{
print_blocklist (sector, length >> GRUB_DISK_SECTOR_BITS, 0, 0, ctx);
sector += length >> GRUB_DISK_SECTOR_BITS;
}
print_blocklist (sector, 0, 0, length & (GRUB_DISK_SECTOR_SIZE - 1), ctx);
}
else
{
ctx->start_sector = sector;
ctx->num_sectors = length >> GRUB_DISK_SECTOR_BITS;
}
}
static grub_err_t
grub_cmd_blocklist (grub_command_t cmd __attribute__ ((unused)),
int argc, char **args)
{
grub_file_t file;
char buf[GRUB_DISK_SECTOR_SIZE];
struct blocklist_ctx ctx = {
.start_sector = 0,
.num_sectors = 0,
.num_entries = 0,
.part_start = 0
};
if (argc < 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
file = grub_file_open (args[0], GRUB_FILE_TYPE_PRINT_BLOCKLIST
| GRUB_FILE_TYPE_NO_DECOMPRESS);
if (! file)
return grub_errno;
if (! file->device->disk)
return grub_error (GRUB_ERR_BAD_DEVICE,
"this command is available only for disk devices");
ctx.part_start = grub_partition_get_start (file->device->disk->partition);
file->read_hook = read_blocklist;
file->read_hook_data = &ctx;
while (grub_file_read (file, buf, sizeof (buf)) > 0)
;
if (ctx.num_sectors > 0)
print_blocklist (ctx.start_sector, ctx.num_sectors, 0, 0, &ctx);
grub_file_close (file);
return grub_errno;
}
static grub_command_t cmd;
GRUB_MOD_INIT(blocklist)
{
cmd = grub_register_command ("blocklist", grub_cmd_blocklist,
N_("FILE"), N_("Print a block list."));
}
GRUB_MOD_FINI(blocklist)
{
grub_unregister_command (cmd);
}
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