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