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sparse_format.h
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1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _LIBSPARSE_SPARSE_FORMAT_H_
18#define _LIBSPARSE_SPARSE_FORMAT_H_
19
20#include <cstdint>
21
22typedef uint32_t __le32;
23typedef uint16_t __le16;
24
25#pragma pack(1)
26
27typedef struct sparse_header {
28 __le32 magic; /* 0xed26ff3a */
29 __le16 major_version; /* (0x1) - reject images with higher major versions */
30 __le16 minor_version; /* (0x0) - allow images with higher minor versions */
31 __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */
32 __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */
33 __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */
34 __le32 total_blks; /* total blocks in the non-sparse output image */
35 __le32 total_chunks; /* total chunks in the sparse input image */
36 __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */
37 /* as 0. Standard 802.3 polynomial, use a Public Domain */
38 /* table implementation */
40
41#define SPARSE_HEADER_MAGIC 0xed26ff3a
42
43#define CHUNK_TYPE_RAW 0xCAC1
44#define CHUNK_TYPE_FILL 0xCAC2
45#define CHUNK_TYPE_DONT_CARE 0xCAC3
46#define CHUNK_TYPE_CRC32 0xCAC4
47
48typedef struct chunk_header {
49 __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */
51 __le32 chunk_sz; /* in blocks in output image */
52 __le32 total_sz; /* in bytes of chunk input file including chunk header and data */
54
55/* Following a Raw or Fill or CRC32 chunk is data.
56 * For a Raw chunk, it's the data in chunk_sz * blk_sz.
57 * For a Fill chunk, it's 4 bytes of the fill data.
58 * For a CRC32 chunk, it's 4 bytes of CRC32
59 */
60#pragma pack()
61
62#endif
struct chunk_header chunk_header_t
uint16_t __le16
Definition sparse_format.h:23
uint32_t __le32
Definition sparse_format.h:22
struct sparse_header sparse_header_t
Definition sparse_format.h:48
__le32 total_sz
Definition sparse_format.h:52
__le16 chunk_type
Definition sparse_format.h:49
__le16 reserved1
Definition sparse_format.h:50
__le32 chunk_sz
Definition sparse_format.h:51
Definition sparse_format.h:27
__le16 major_version
Definition sparse_format.h:29
__le16 chunk_hdr_sz
Definition sparse_format.h:32
__le32 image_checksum
Definition sparse_format.h:36
__le32 total_chunks
Definition sparse_format.h:35
__le32 magic
Definition sparse_format.h:28
__le32 total_blks
Definition sparse_format.h:34
__le16 minor_version
Definition sparse_format.h:30
__le16 file_hdr_sz
Definition sparse_format.h:31
__le32 blk_sz
Definition sparse_format.h:33