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/*
TWRP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
TWRP is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with TWRP. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TWADBSTREAM_H
#define __TWADBSTREAM_H
#define TW_ADB_BACKUP "/tmp/twadbbackup" //FIFO for adb backup
#define TW_ADB_RESTORE "/tmp/twadbrestore" //FIFO for adb restore
#define TW_ADB_BU_CONTROL "/tmp/twadbbucontrol" //FIFO for sending control from TWRP to ADB Backup
#define TW_ADB_TWRP_CONTROL "/tmp/twadbtwrpcontrol" //FIFO for sending control from ADB Backup to TWRP
#define TWRP "TWRP" //Magic Value
#define ADB_BU_MAX_ERROR 10 //Max amount of errors for while loops
//ADB Backup Control Commands
#define TWSTREAMHDR "twstreamheader" //TWRP Parititon Count Control
#define TWFN "twfilename" //TWRP Filename Control
#define TWIMG "twimage" //TWRP Image name Control
#define TWEOF "tweof" //End of File for Image/File
#define MD5TRAILER "md5trailer" //Image/File MD5 Trailer
#define TWDATA "twdatablock" // twrp adb backup data block header
#define TWMD5 "twverifymd5" //This command is compared to the md5trailer by ORS to verify transfer
#define TWENDADB "twendadb" //End Protocol
#define TWERROR "twerror" //Send error
#define ADB_BACKUP_VERSION 1 //Backup Version
#define DATA_MAX_CHUNK_SIZE 1048576 //Maximum size between each data header
#define MAX_ADB_READ 512 //align with default tar size for amount to read fom adb stream
/*
structs for adb backup need to align to 512 bytes for reading 512
bytes at a time
Each struct contains a crc field so that when we are checking for commands
and the crc doesn't match we still assume it's data matching the command
struct but not really a command
*/
/* stream format:
| TW ADB Backup Header |
| TW File Stream Header |
| File Data |
| File/Image MD5 Trailer |
| TW File Stream Header |
| File Data |
| File/Image MD5 Trailer |
| etc... |
*/
//determine whether struct is 512 bytes, if not fail compilation
#define ADBSTRUCT_STATIC_ASSERT(structure) typedef char adb_assertion[( !!(structure) )*2-1 ]
//generic cmd structure to align fields for sending commands to and from adb backup
struct AdbBackupControlType {
char start_of_header[8]; //stores the magic value #define TWRP
char type[16]; //stores the type of command, TWENDADB, TWCNT, TWEOF, TWMD5, TWDATA and TWERROR
uint32_t crc; //stores the zlib 32 bit crc of the AdbBackupControlType struct to allow for making sure we are processing metadata
char space[484]; //stores space to align the struct to 512 bytes
};
//general info for file metadata stored in adb backup header
struct twfilehdr {
char start_of_header[8]; //stores the magic value #define TWRP
char type[16]; //stores the type of file header, TWFN or TWIMG
uint64_t size; //stores the size of the file contained after this header in the backup file
uint64_t compressed; //stores whether the file is compressed or not. 1 == compressed and 0 == uncompressed
uint32_t crc; //stores the zlib 32 bit crc of the twfilehdr struct to allow for making sure we are processing metadata
char name[468]; //stores the filename of the file
};
//md5 for files stored as a trailer to files in the adb backup file to check
//that they are restored correctly
struct AdbBackupFileTrailer {
char start_of_trailer[8]; //stores the magic value #define TWRP
char type[16]; //stores the AdbBackupFileTrailer type MD5TRAILER
uint32_t crc; //stores the zlib 32 bit crc of the AdbBackupFileTrailer struct to allow for making sure we are processing metadata
uint32_t ident; //stores crc to determine if header is encapsulated in stream as data
char md5[40]; //stores the md5 computation of the file
char space[440]; //stores space to align the struct to 512 bytes
};
//info for version and number of partitions backed up
struct AdbBackupStreamHeader {
char start_of_header[8]; //stores the magic value #define TWRP
char type[16]; //stores the AdbBackupStreamHeader value TWCNT
uint64_t partition_count; //stores the number of partitions to restore in the stream
uint64_t version; //stores the version of adb backup. increment ADB_BACKUP_VERSION each time the metadata is updated
uint32_t crc; //stores the zlib 32 bit crc of the AdbBackupStreamHeader struct to allow for making sure we are processing metadata
char space[468]; //stores space to align the struct to 512 bytes
};
#endif //__TWADBSTREAM_H
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