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