1 files changed, 122 insertions, 0 deletions
diff --git a/grub-core/commands/blocklist.c b/grub-core/commands/blocklist.c
new file mode 100644
index 0000000..5eb12e4
--- /dev/null
+++ b/grub-core/commands/blocklist.c
@@ -0,0 +1,122 @@
+/* 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+");
+
+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];
+  unsigned long start_sector = 0;
+  unsigned num_sectors = 0;
+  int num_entries = 0;
+  grub_disk_addr_t part_start = 0;
+  auto void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
+			    unsigned length);
+  auto void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
+			     unsigned offset, unsigned length);
+
+  void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
+		       unsigned length)
+    {
+      if (num_sectors > 0)
+	{
+	  if (start_sector + num_sectors == sector
+	      && offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
+	    {
+	      num_sectors++;
+	      return;
+	    }
+
+	  print_blocklist (start_sector, num_sectors, 0, 0);
+	  num_sectors = 0;
+	}
+
+      if (offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
+	{
+	  start_sector = sector;
+	  num_sectors++;
+	}
+      else
+	print_blocklist (sector, 0, offset, length);
+    }
+
+  void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
+			unsigned offset, unsigned length)
+    {
+      if (num_entries++)
+	grub_printf (",");
+
+      grub_printf ("%llu", (unsigned long long) (sector - part_start));
+      if (num > 0)
+	grub_printf ("+%u", num);
+      if (offset != 0 || length != 0)
+	grub_printf ("[%u-%u]", offset, offset + length);
+    }
+
+  if (argc < 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
+
+  grub_file_filter_disable_compression ();
+  file = grub_file_open (args[0]);
+  if (! file)
+    return grub_errno;
+
+  if (! file->device->disk)
+    return grub_error (GRUB_ERR_BAD_DEVICE,
+		       "this command is available only for disk devices");
+
+  part_start = grub_partition_get_start (file->device->disk->partition);
+
+  file->read_hook = read_blocklist;
+
+  while (grub_file_read (file, buf, sizeof (buf)) > 0)
+    ;
+
+  if (num_sectors > 0)
+    print_blocklist (start_sector, num_sectors, 0, 0);
+
+  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);
+}