support 'cgpt repair'

src/platform/vboot_reference/cgptlib/cgptlib.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "cgptlib.h"
 #include <string.h>
 #include "cgptlib_internal.h"
 #include "crc32.h"
 #include "gpt.h"
 #include "quick_sort.h"
 #include "utility.h"
 
 /* Macro to invalidate a GPT header/entries */
 #define INVALIDATE_HEADER(valid_headers, index) \
   do { \
     debug("- INVALIDATE_HEADER() at %s():%d\n", __FUNCTION__, __LINE__); \
     valid_headers &= ~(1<<index); \
   } while (0)
 #define INVALIDATE_ENTRIES(valid_entries, index) \
   do { \
     debug("- INVALIDATE_ENTRIES() at %s():%d\n", __FUNCTION__, __LINE__); \
     valid_entries &= ~(1<<index); \
   } while (0)
 
 const char *GptError(int errno) {
   const char *error_string[] = {
     /* GPT_SUCCESS */ "Success",
     /* GPT_ERROR_NO_VALID_KERNEL */ "No valid kernel entry",
-    /* GPT_ERROR_INVALID_HEADERS */ "Invalid headers",
-    /* GPT_ERROR_INVALID_ENTRIES */ "Invalid entries",
+    /* GPT_ERROR_INVALID_HEADERS */ "Both primary and secondary headers are "
+                                    "invalid.",
+    /* GPT_ERROR_INVALID_ENTRIES */ "Both primary and secondary entries are "
+                                    "invalid.",
     /* GPT_ERROR_INVALID_SECTOR_SIZE */ "Invalid sector size",
     /* GPT_ERROR_INVALID_SECTOR_NUMBER */ "Invalid sector number",
     /* GPT_ERROR_INVALID_UPDATE_TYPE */ "Invalid update type",
   };
   return error_string[errno];
 }
 
 /* Checks if sector_bytes and drive_sectors are valid values. */
 int CheckParameters(GptData *gpt) {
   /* Currently, we only support 512-byte sector. In the future, we may support
@@ skipping 717 matching lines @@
     RepairEntries(gpt, MASK_PRIMARY);
     /* Actually two entries are dirty now.
     * Also two headers are dirty because entries_crc32 has been updated. */
     gpt->modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
                       GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
     UpdateCrc(gpt);
   }
 
   return GPT_SUCCESS;
 }