automake commit without merge history

grub-core/commands/crc.c

@@ -0,0 +1,71 @@
+/* crc.c - command to calculate the crc32 checksum of a file  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008,2010  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/disk.h>
+#include <grub/file.h>
+#include <grub/misc.h>
+#include <grub/lib/crc.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+
+static grub_err_t
+grub_cmd_crc (grub_command_t cmd __attribute__ ((unused)),
+	      int argc, char **args)
+
+{
+  grub_file_t file;
+  char buf[GRUB_DISK_SECTOR_SIZE];
+  grub_ssize_t size;
+  grub_uint32_t crc;
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
+
+  file = grub_file_open (args[0]);
+  if (! file)
+    return 0;
+
+  crc = 0;
+  while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
+    crc = grub_getcrc32 (crc, buf, size);
+
+  if (grub_errno)
+    goto fail;
+
+  grub_printf ("%08x\n", crc);
+
+ fail:
+  grub_file_close (file);
+  return 0;
+}
+
+static grub_command_t cmd;
+
+GRUB_MOD_INIT(crc)
+{
+  cmd = grub_register_command ("crc", grub_cmd_crc,
+			       N_("FILE"),
+			       N_("Calculate the crc32 checksum of a file."));
+}
+
+GRUB_MOD_FINI(crc)
+{
+  grub_unregister_command (cmd);
+}