1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _LIBSPARSE_SPARSE_FORMAT_H_ 18 #define _LIBSPARSE_SPARSE_FORMAT_H_ 19 #include "sparse_defs.h" 20 21 typedef struct sparse_header { 22 __le32 magic; /* 0xed26ff3a */ 23 __le16 major_version; /* (0x1) - reject images with higher major versions */ 24 __le16 minor_version; /* (0x0) - allow images with higer minor versions */ 25 __le16 file_hdr_sz; /* 28 bytes for first revision of the file format */ 26 __le16 chunk_hdr_sz; /* 12 bytes for first revision of the file format */ 27 __le32 blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */ 28 __le32 total_blks; /* total blocks in the non-sparse output image */ 29 __le32 total_chunks; /* total chunks in the sparse input image */ 30 __le32 image_checksum; /* CRC32 checksum of the original data, counting "don't care" */ 31 /* as 0. Standard 802.3 polynomial, use a Public Domain */ 32 /* table implementation */ 33 } sparse_header_t; 34 35 #define SPARSE_HEADER_MAGIC 0xed26ff3a 36 37 #define CHUNK_TYPE_RAW 0xCAC1 38 #define CHUNK_TYPE_FILL 0xCAC2 39 #define CHUNK_TYPE_DONT_CARE 0xCAC3 40 #define CHUNK_TYPE_CRC32 0xCAC4 41 42 typedef struct chunk_header { 43 __le16 chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */ 44 __le16 reserved1; 45 __le32 chunk_sz; /* in blocks in output image */ 46 __le32 total_sz; /* in bytes of chunk input file including chunk header and data */ 47 } chunk_header_t; 48 49 /* Following a Raw or Fill or CRC32 chunk is data. 50 * For a Raw chunk, it's the data in chunk_sz * blk_sz. 51 * For a Fill chunk, it's 4 bytes of the fill data. 52 * For a CRC32 chunk, it's 4 bytes of CRC32 53 */ 54 55 #endif 56