1 /* 2 * The file header definition of a sparse Copy-On-Write Disk (COWD) file 3 * 4 * Copyright (C) 2009-2021, Joachim Metz <joachim.metz@gmail.com> 5 * 6 * Refer to AUTHORS for acknowledgements. 7 * 8 * This program is free software: you can redistribute it and/or modify 9 * it under the terms of the GNU Lesser General Public License as published by 10 * the Free Software Foundation, either version 3 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public License 19 * along with this program. If not, see <https://www.gnu.org/licenses/>. 20 */ 21 22 #if !defined( _COWD_SPARSE_FILE_HEADER_H ) 23 #define _COWD_SPARSE_FILE_HEADER_H 24 25 #include <common.h> 26 #include <types.h> 27 28 #if defined( __cplusplus ) 29 extern "C" { 30 #endif 31 32 typedef struct cowd_sparse_file_header cowd_sparse_file_header_t; 33 34 struct cowd_sparse_file_header 35 { 36 /* The signature 37 * Consists of 4 bytes 38 * Contains: "KDMV" 39 */ 40 uint8_t signature[ 4 ]; 41 42 /* The version 43 * Consists of 4 bytes 44 */ 45 uint8_t version[ 4 ]; 46 47 /* The flags 48 * Consists of 4 bytes 49 */ 50 uint8_t flags[ 4 ]; 51 52 /* The maximum data number of sectors (capacity) 53 * Consists of 4 bytes 54 * Contains a value in sectors 55 */ 56 uint8_t maximum_data_number_of_sectors[ 4 ]; 57 58 /* The grain number of sectors 59 * Consists of 4 bytes 60 * Contains a value in sectors 61 */ 62 uint8_t grain_number_of_sectors[ 4 ]; 63 64 /* The primary grain directory sector number 65 * Consists of 4 bytes 66 * Contains a value in sectors 67 */ 68 uint8_t primary_grain_directory_sector_number[ 4 ]; 69 70 /* The number of grain directory entries 71 * Consists of 4 bytes 72 */ 73 uint8_t number_of_grain_directory_entries[ 4 ]; 74 75 /* The next free grain 76 * Consists of 4 bytes 77 */ 78 uint8_t next_free_grain[ 4 ]; 79 80 union 81 { 82 struct 83 { 84 /* The number of cylinders 85 * Consists of 4 bytes 86 */ 87 uint8_t number_of_cylinders[ 4 ]; 88 89 /* The number of heads 90 * Consists of 4 bytes 91 */ 92 uint8_t number_of_heads[ 4 ]; 93 94 /* The number of sectors 95 * Consists of 4 bytes 96 */ 97 uint8_t number_of_sectors[ 4 ]; 98 }; 99 struct 100 { 101 /* The parent filename 102 * Consists of 1024 bytes 103 */ 104 uint8_t parent_filename[ 1024 ]; 105 106 /* The parent generation 107 * Consists of 4 bytes 108 */ 109 uint8_t parent_generation[ 4 ]; 110 111 }; 112 }; 113 114 /* The generation 115 * Consists of 4 bytes 116 */ 117 uint8_t generation[ 4 ]; 118 119 /* The name 120 * Consists of 60 bytes 121 */ 122 uint8_t name[ 60 ]; 123 124 /* The description 125 * Consists of 512 bytes 126 */ 127 uint8_t description[ 512 ]; 128 129 /* The saved generation 130 * Consists of 4 bytes 131 */ 132 uint8_t saved_generation[ 4 ]; 133 134 /* Reserved 135 * Consists of 8 bytes 136 */ 137 uint8_t reserved[ 8 ]; 138 139 /* Value to indicate the COWD was cleanly closed 140 * Consists of 1 byte 141 */ 142 uint8_t is_dirty; 143 144 /* Padding 145 * Consists of 396 bytes 146 */ 147 uint8_t padding[ 396 ]; 148 }; 149 150 #if defined( __cplusplus ) 151 } 152 #endif 153 154 #endif /* !defined( _COWD_SPARSE_FILE_HEADER_H ) */ 155 156