Add more test cases for GptInit() and fixed some bugs

src/platform/vboot_reference/cgptlib/cgpt.h

 /* 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.
  */
 
 #ifndef VBOOT_REFERENCE_CGPT_H_
 #define VBOOT_REFERENCE_CGPT_H_
 
+#include "gpt.h"
 #include <stdint.h>
 
 enum {
   GPT_SUCCESS = 0,
   GPT_ERROR_NO_VALID_KERNEL,
   GPT_ERROR_INVALID_HEADERS,
   GPT_ERROR_INVALID_ENTRIES,
   GPT_ERROR_INVALID_SECTOR_SIZE,
   GPT_ERROR_INVALID_SECTOR_NUMBER,
 };
 
+/* Bit masks for GptData.modified field. */
 #define GPT_MODIFIED_HEADER1 0x01
 #define GPT_MODIFIED_HEADER2 0x02
 #define GPT_MODIFIED_ENTRIES1 0x04
 #define GPT_MODIFIED_ENTRIES2 0x08
 
 #define GPT_UPDATE_ENTRY_TRY 1
   /* System will be trying to boot the currently selected kernel partition.
    * Update its try count if necessary. */
 #define GPT_UPDATE_ENTRY_BAD 2
   /* The currently selected kernel partition failed validation.  Mark entry as
    * invalid. */
 
-struct GptData {
+/* Defines ChromeOS-specific limitation on GPT */
+#define MIN_SIZE_OF_HEADER 92
+#define MAX_SIZE_OF_HEADER 512
+#define MIN_SIZE_OF_ENTRY 128
+#define MAX_SIZE_OF_ENTRY 512
+#define SIZE_OF_ENTRY_MULTIPLE 8
+#define MIN_NUMBER_OF_ENTRIES 32
+#define MAX_NUMBER_OF_ENTRIES 512
+#define TOTAL_ENTRIES_SIZE 16384  /* usual case is 128 bytes * 128 entries */
+
+/* Defines GPT sizes */
+#define GPT_PMBR_SECTOR 1  /* size (in sectors) of PMBR */
+#define GPT_HEADER_SECTOR 1
+#define GPT_ENTRIES_SECTORS 32  /* assume sector size if 512 bytes, then
+                                 *  (TOTAL_ENTRIES_SIZE / 512) = 32 */
+
+/* alias name of index in internal array for primary and secondary header and
+ * entries. */
+enum {
+  PRIMARY = 0,
+  SECONDARY = 1,
+  MASK_NONE = 0,
+  MASK_PRIMARY = 1,
+  MASK_SECONDARY = 2,
+  MASK_BOTH = 3,
+};
+
+typedef struct {
   /* Fill in the following fields before calling GptInit() */
   uint8_t *primary_header;       /* GPT primary header, from sector 1 of disk
                                   *   (size: 512 bytes) */
   uint8_t *secondary_header;     /* GPT secondary header, from last sector of
                                   *   disk (size: 512 bytes) */
   uint8_t *primary_entries;      /* primary GPT table, follows primary header
                                   *   (size: 16 KB) */
   uint8_t *secondary_entries;    /* secondary GPT table, precedes secondary
                                   *   header (size: 16 KB) */
   uint32_t sector_bytes;         /* Size of a LBA sector, in bytes */
   uint64_t drive_sectors;        /* Size of drive in LBA sectors, in sectors */
 
   /* Outputs */
   uint8_t modified;              /* Which inputs have been modified?
                                   * 0x01 = header1
                                   * 0x02 = header2
                                   * 0x04 = table1
                                   * 0x08 = table2  */
 
   /* Internal state */
   uint8_t current_kernel; /* the current kernel index */
-};
-typedef struct GptData GptData_t;
+} GptData;
 
-int GptInit(GptData_t *gpt);
+int GptInit(GptData *gpt);
 /* Initializes the GPT data structure's internal state.  The header1, header2,
  * table1, table2, and drive_size fields should be filled in first.
  *
  * On return the modified field may be set, if the GPT data has been modified
  * and should be written to disk.
  *
  * Returns 0 if successful, non-zero if error:
  *   GPT_ERROR_INVALID_HEADERS, both partition table headers are invalid, enters
  *                              recovery mode,
  *   GPT_ERROR_INVALID_ENTRIES, both partition table entries are invalid, enters
  *                              recovery mode,
  *   GPT_ERROR_INVALID_SECTOR_SIZE, size of a sector is not supported,
  *   GPT_ERROR_INVALID_SECTOR_NUMBER, number of sectors in drive is invalid (too
  *                                    small) */
 
-int GptNextKernelEntry(GptData_t *gpt, uint64_t *start_sector, uint64_t *size);
+int GptNextKernelEntry(GptData *gpt, uint64_t *start_sector, uint64_t *size);
 /* Provides the location of the next kernel partition, in order of decreasing
  * priority.  On return the start_sector parameter contains the LBA sector
  * for the start of the kernel partition, and the size parameter contains the
  * size of the kernel partition in LBA sectors.
  *
  * Returns 0 if successful, else
  *   GPT_ERROR_NO_VALID_KERNEL, no avaliable kernel, enters recovery mode */
 
-int GptUpdateKernelEntry(GptData_t *gpt, uint32_t update_type);
+int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type);
 /* Updates the kernel entry with the specified index, using the specified type
  * of update (GPT_UPDATE_ENTRY_*).
  *
  * On return the modified field may be set, if the GPT data has been modified
  * and should be written to disk.
  *
  * Returns 0 if successful, 1 if error. */
 
 #endif  /* VBOOT_REFERENCE_CGPT_H_ */