1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * This is from the Android Project, 3*4882a593Smuzhiyun * Repository: https://android.googlesource.com/platform/system/core 4*4882a593Smuzhiyun * File: libsparse/sparse_format.h 5*4882a593Smuzhiyun * Commit: 28fa5bc347390480fe190294c6c385b6a9f0d68b 6*4882a593Smuzhiyun * Copyright (C) 2010 The Android Open Source Project 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * SPDX-License-Identifier: BSD-3-Clause 9*4882a593Smuzhiyun */ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #ifndef _LIBSPARSE_SPARSE_FORMAT_H_ 12*4882a593Smuzhiyun #define _LIBSPARSE_SPARSE_FORMAT_H_ 13*4882a593Smuzhiyun #include "sparse_defs.h" 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun typedef struct sparse_header { 16*4882a593Smuzhiyun __le32 magic; /* 0xed26ff3a */ 17*4882a593Smuzhiyun __le16 major_version; /* (0x1) - reject images with higher major versions */ 18*4882a593Smuzhiyun __le16 minor_version; /* (0x0) - allow images with higer minor versions */ 19*4882a593Smuzhiyun __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */ 20*4882a593Smuzhiyun __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */ 21*4882a593Smuzhiyun __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */ 22*4882a593Smuzhiyun __le32 total_blks; /* total blocks in the non-sparse output image */ 23*4882a593Smuzhiyun __le32 total_chunks; /* total chunks in the sparse input image */ 24*4882a593Smuzhiyun __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */ 25*4882a593Smuzhiyun /* as 0. Standard 802.3 polynomial, use a Public Domain */ 26*4882a593Smuzhiyun /* table implementation */ 27*4882a593Smuzhiyun } sparse_header_t; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun #define SPARSE_HEADER_MAGIC 0xed26ff3a 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #define CHUNK_TYPE_RAW 0xCAC1 32*4882a593Smuzhiyun #define CHUNK_TYPE_FILL 0xCAC2 33*4882a593Smuzhiyun #define CHUNK_TYPE_DONT_CARE 0xCAC3 34*4882a593Smuzhiyun #define CHUNK_TYPE_CRC32 0xCAC4 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun typedef struct chunk_header { 37*4882a593Smuzhiyun __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */ 38*4882a593Smuzhiyun __le16 reserved1; 39*4882a593Smuzhiyun __le32 chunk_sz; /* in blocks in output image */ 40*4882a593Smuzhiyun __le32 total_sz; /* in bytes of chunk input file including chunk header and data */ 41*4882a593Smuzhiyun } chunk_header_t; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /* Following a Raw or Fill or CRC32 chunk is data. 44*4882a593Smuzhiyun * For a Raw chunk, it's the data in chunk_sz * blk_sz. 45*4882a593Smuzhiyun * For a Fill chunk, it's 4 bytes of the fill data. 46*4882a593Smuzhiyun * For a CRC32 chunk, it's 4 bytes of CRC32 47*4882a593Smuzhiyun */ 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun #endif 50