1*478a3287SColin Cross /* 2*478a3287SColin Cross * This is from the Android Project, 3*478a3287SColin Cross * Repository: https://android.googlesource.com/platform/system/core 4*478a3287SColin Cross * File: libsparse/sparse_format.h 5*478a3287SColin Cross * Commit: 28fa5bc347390480fe190294c6c385b6a9f0d68b 6*478a3287SColin Cross * Copyright (C) 2010 The Android Open Source Project 7*478a3287SColin Cross * 8*478a3287SColin Cross * SPDX-License-Identifier: BSD-3-Clause 9*478a3287SColin Cross */ 10*478a3287SColin Cross 11*478a3287SColin Cross #ifndef _LIBSPARSE_SPARSE_FORMAT_H_ 12*478a3287SColin Cross #define _LIBSPARSE_SPARSE_FORMAT_H_ 13*478a3287SColin Cross #include "sparse_defs.h" 14*478a3287SColin Cross 15*478a3287SColin Cross typedef struct sparse_header { 16*478a3287SColin Cross __le32 magic; /* 0xed26ff3a */ 17*478a3287SColin Cross __le16 major_version; /* (0x1) - reject images with higher major versions */ 18*478a3287SColin Cross __le16 minor_version; /* (0x0) - allow images with higer minor versions */ 19*478a3287SColin Cross __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */ 20*478a3287SColin Cross __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */ 21*478a3287SColin Cross __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */ 22*478a3287SColin Cross __le32 total_blks; /* total blocks in the non-sparse output image */ 23*478a3287SColin Cross __le32 total_chunks; /* total chunks in the sparse input image */ 24*478a3287SColin Cross __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */ 25*478a3287SColin Cross /* as 0. Standard 802.3 polynomial, use a Public Domain */ 26*478a3287SColin Cross /* table implementation */ 27*478a3287SColin Cross } sparse_header_t; 28*478a3287SColin Cross 29*478a3287SColin Cross #define SPARSE_HEADER_MAGIC 0xed26ff3a 30*478a3287SColin Cross 31*478a3287SColin Cross #define CHUNK_TYPE_RAW 0xCAC1 32*478a3287SColin Cross #define CHUNK_TYPE_FILL 0xCAC2 33*478a3287SColin Cross #define CHUNK_TYPE_DONT_CARE 0xCAC3 34*478a3287SColin Cross #define CHUNK_TYPE_CRC32 0xCAC4 35*478a3287SColin Cross 36*478a3287SColin Cross typedef struct chunk_header { 37*478a3287SColin Cross __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */ 38*478a3287SColin Cross __le16 reserved1; 39*478a3287SColin Cross __le32 chunk_sz; /* in blocks in output image */ 40*478a3287SColin Cross __le32 total_sz; /* in bytes of chunk input file including chunk header and data */ 41*478a3287SColin Cross } chunk_header_t; 42*478a3287SColin Cross 43*478a3287SColin Cross /* Following a Raw or Fill or CRC32 chunk is data. 44*478a3287SColin Cross * For a Raw chunk, it's the data in chunk_sz * blk_sz. 45*478a3287SColin Cross * For a Fill chunk, it's 4 bytes of the fill data. 46*478a3287SColin Cross * For a CRC32 chunk, it's 4 bytes of CRC32 47*478a3287SColin Cross */ 48*478a3287SColin Cross 49*478a3287SColin Cross #endif 50