1 /* 2 * This is from the Android Project, 3 * Repository: https://android.googlesource.com/platform/system/core 4 * File: libsparse/sparse_format.h 5 * Commit: 28fa5bc347390480fe190294c6c385b6a9f0d68b 6 * Copyright (C) 2010 The Android Open Source Project 7 * 8 * SPDX-License-Identifier: BSD-3-Clause 9 */ 10 11 #ifndef _LIBSPARSE_SPARSE_FORMAT_H_ 12 #define _LIBSPARSE_SPARSE_FORMAT_H_ 13 #include "sparse_defs.h" 14 15 typedef struct sparse_header { 16 __le32 magic; /* 0xed26ff3a */ 17 __le16 major_version; /* (0x1) - reject images with higher major versions */ 18 __le16 minor_version; /* (0x0) - allow images with higer minor versions */ 19 __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */ 20 __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */ 21 __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */ 22 __le32 total_blks; /* total blocks in the non-sparse output image */ 23 __le32 total_chunks; /* total chunks in the sparse input image */ 24 __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */ 25 /* as 0. Standard 802.3 polynomial, use a Public Domain */ 26 /* table implementation */ 27 } sparse_header_t; 28 29 #define SPARSE_HEADER_MAGIC 0xed26ff3a 30 31 #define CHUNK_TYPE_RAW 0xCAC1 32 #define CHUNK_TYPE_FILL 0xCAC2 33 #define CHUNK_TYPE_DONT_CARE 0xCAC3 34 #define CHUNK_TYPE_CRC32 0xCAC4 35 36 typedef struct chunk_header { 37 __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */ 38 __le16 reserved1; 39 __le32 chunk_sz; /* in blocks in output image */ 40 __le32 total_sz; /* in bytes of chunk input file including chunk header and data */ 41 } chunk_header_t; 42 43 /* Following a Raw or Fill or CRC32 chunk is data. 44 * For a Raw chunk, it's the data in chunk_sz * blk_sz. 45 * For a Fill chunk, it's 4 bytes of the fill data. 46 * For a CRC32 chunk, it's 4 bytes of CRC32 47 */ 48 49 #endif 50