| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | typedef struct sparse_header { |
| 18 | UINT32_T magic; /* 0xed26ff3a */ |
| 19 | UINT16_T major_version; /* (0x1) - reject images with higher major versions */ |
| 20 | UINT16_T minor_version; /* (0x0) - allow images with higer minor versions */ |
| 21 | UINT16_T file_hdr_sz; /* 28 bytes for first revision of the file format */ |
| 22 | UINT16_T chunk_hdr_sz; /* 12 bytes for first revision of the file format */ |
| 23 | UINT32_T blk_sz; /* block size in bytes, must be a multiple of 4 (4096) */ |
| 24 | UINT32_T total_blks; /* total blocks in the non-sparse output image */ |
| 25 | UINT32_T total_chunks; /* total chunks in the sparse input image */ |
| 26 | UINT32_T image_checksum; /* CRC32 checksum of the original data, counting "don't care" */ |
| 27 | /* as 0. Standard 802.3 polynomial, use a Public Domain */ |
| 28 | /* table implementation */ |
| 29 | } sparse_header_t; |
| 30 | |
| 31 | #define SPARSE_HEADER_MAGIC 0xed26ff3a |
| 32 | |
| 33 | #define CHUNK_TYPE_RAW 0xCAC1 |
| 34 | #define CHUNK_TYPE_FILL 0xCAC2 |
| 35 | #define CHUNK_TYPE_DONT_CARE 0xCAC3 |
| 36 | |
| 37 | typedef struct chunk_header { |
| 38 | UINT16_T chunk_type; /* 0xCAC1 -> raw; 0xCAC2 -> fill; 0xCAC3 -> don't care */ |
| 39 | UINT16_T reserved1; |
| 40 | UINT32_T chunk_sz; /* in blocks in output image */ |
| 41 | UINT32_T total_sz; /* in bytes of chunk input file including chunk header and data */ |
| 42 | } chunk_header_t; |
| 43 | |
| 44 | /* Following a Raw or Fill chunk is data. 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 | */ |
| 47 | |