partitions.h revision e160f81713034e1b5cfa6f8d8b47870b47ae84c8 
1/*
2 * Copyright (c) 2009-2013, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *  * Neither the name of Google, Inc. nor the names of its contributors
15 *    may be used to endorse or promote products derived from this
16 *    software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32
33#ifndef __FASTBOOTD_PATITIONS_
34#define __FASTBOOTD_PATITIONS_
35
36#include <stdint.h>
37
38#define GPT_ENTRIES 128
39#define GPT_NAMELEN 36
40
41// it should be passed in little endian order
42struct GPT_entry_raw {
43    uint8_t type_guid[16];
44    uint8_t partition_guid[16];
45    uint64_t first_lba; // little endian
46    uint64_t last_lba;
47    uint64_t flags;
48    uint16_t name[GPT_NAMELEN]; // UTF-16 LE
49};
50
51struct GPT_mapping {
52    void *map_ptr;
53    void *ptr;
54    unsigned size;
55};
56
57struct GPT_entry_table {
58    int fd;
59
60    struct GPT_mapping header_map;
61    struct GPT_mapping entries_map;
62    struct GPT_mapping sec_header_map;
63    struct GPT_mapping sec_entries_map;
64
65    struct GPT_header *header;
66    struct GPT_entry_raw *entries;
67    struct GPT_header *second_header;
68    struct GPT_entry_raw *second_entries;
69
70    unsigned sector_size;
71    unsigned partition_table_size;
72    int second_valid;
73};
74
75struct GPT_header {
76    uint8_t signature[8];
77    uint32_t revision;
78    uint32_t header_size;
79    uint32_t header_checksum;
80    uint32_t reserved_zeros;
81    uint64_t current_lba;
82    uint64_t backup_lba;
83    uint64_t first_usable_lba;
84    uint64_t last_usable_lba;
85    uint8_t disk_guid[16];
86    uint64_t entries_lba;
87    uint32_t entries_count;
88    uint32_t entry_size;
89    uint32_t partition_array_checksum;
90    // the rest should be filled with zeros
91} __attribute__((packed));
92
93struct GPT_content {
94    struct GPT_header header;
95    struct GPT_entry_raw *entries;
96};
97
98
99struct GPT_entry_table* GPT_get_device(const char *, unsigned lba);
100
101void GPT_release_device(struct GPT_entry_table *);
102
103void GPT_edit_entry(struct GPT_entry_table *table,
104                    struct GPT_entry_raw *old_entry,
105                    struct GPT_entry_raw *new_entry);
106
107int GPT_delete_entry(struct GPT_entry_table *table, struct GPT_entry_raw *entry);
108
109void GPT_add_entry(struct GPT_entry_table *table, struct GPT_entry_raw *entry);
110
111struct GPT_entry_raw *GPT_get_pointer(struct GPT_entry_table *table, struct GPT_entry_raw *entry);
112struct GPT_entry_raw *GPT_get_pointer_by_guid(struct GPT_entry_table *, const char *);
113struct GPT_entry_raw *GPT_get_pointer_by_name(struct GPT_entry_table *, const char *);
114
115//Use after every edit operation
116void GPT_sync();
117
118void GPT_to_UTF16(uint16_t *, const char *, int );
119void GPT_from_UTF16(char *, const uint16_t *, int);
120
121int GPT_parse_entry(char *string, struct GPT_entry_raw *entry);
122
123void GPT_default_content(struct GPT_content *content, struct GPT_entry_table *table);
124
125void GPT_release_content(struct GPT_content *content);
126
127int GPT_parse_file(int fd, struct GPT_content *content);
128
129int GPT_write_content(const char *device, struct GPT_content *content);
130
131int gpt_mmap(struct GPT_mapping *mapping, uint64_t location, int size, int fd);
132
133void gpt_unmap(struct GPT_mapping *mapping);
134
135#endif
136