6 files changed, 1258 insertions, 0 deletions

diff --git a/adbbu/Android.mk b/adbbu/Android.mk
new file mode 100644
index 000000000..65568ef3f
--- /dev/null
+++ b/adbbu/Android.mk
@@ -0,0 +1,45 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	twrpback.cpp \
+	../twrpDigest.cpp \
+	../digest/md5.c
+LOCAL_SHARED_LIBRARIES += libstdc++ libz
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+    LOCAL_SHARED_LIBRARIES += libstlport
+else
+    LOCAL_SHARED_LIBRARIES += libc++
+endif
+
+LOCAL_C_INCLUDES += bionic external/zlib
+LOCAL_CFLAGS:= -c -W
+LOCAL_MODULE:= twrpbu
+LOCAL_MODULE_STEM := bu
+LOCAL_MODULE_TAGS:= eng
+LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
+LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
+include $(BUILD_EXECUTABLE)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := libtwadbbu
+LOCAL_MODULE_TAGS := optional
+LOCAL_CFLAGS = -D_FILE_OFFSET_BITS=64 -DMTP_DEVICE -DMTP_HOST -fno-strict-aliasing
+LOCAL_C_INCLUDES += $(LOCAL_PATH) bionic frameworks/base/include system/core/include bionic/libc/private/
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_C_INCLUDES += external/stlport/stlport
+endif
+
+LOCAL_SRC_FILES = \
+    libtwadbbu.cpp
+
+LOCAL_SHARED_LIBRARIES += libz libc libstdc++
+
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+    LOCAL_SHARED_LIBRARIES += libstlport
+else
+    LOCAL_SHARED_LIBRARIES += libc++
+endif
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/adbbu/libtwadbbu.cpp b/adbbu/libtwadbbu.cpp
new file mode 100644
index 000000000..cdc2170ba
--- /dev/null
+++ b/adbbu/libtwadbbu.cpp
@@ -0,0 +1,196 @@
+/*
+		Copyright 2013 to 2016 TeamWin
+		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/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <zlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <string>
+#include <fstream>
+#include <sstream>
+
+#include "twadbstream.h"
+#include "libtwadbbu.hpp"
+
+bool twadbbu::Write_ADB_Stream_Header(uint64_t partition_count) {
+	struct AdbBackupStreamHeader twhdr;
+	int adb_control_bu_fd;
+
+	memset(&twhdr, 0, sizeof(twhdr));
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+	if (adb_control_bu_fd < 0) {
+		printf("Cannot write to TW_ADB_BU_CONTROL.\n");
+		return false;
+	}
+
+	strncpy(twhdr.start_of_header, TWRP, sizeof(twhdr.start_of_header));
+	strncpy(twhdr.type, TWSTREAMHDR, sizeof(twhdr.type));
+	twhdr.partition_count = partition_count;
+	twhdr.version = ADB_BACKUP_VERSION;
+	memset(twhdr.space, 0, sizeof(twhdr.space));
+	twhdr.crc = crc32(0L, Z_NULL, 0);
+	twhdr.crc = crc32(twhdr.crc, (const unsigned char*) &twhdr, sizeof(twhdr));
+	if (write(adb_control_bu_fd, &twhdr, sizeof(twhdr)) < 0) {
+		printf("Cannot write to adb control channel\n");
+		close(adb_control_bu_fd);
+		return false;
+	}
+	return true;
+}
+
+bool twadbbu::Write_ADB_Stream_Trailer() {
+	int adb_control_bu_fd;
+	struct AdbBackupControlType endadb;
+
+	memset(&endadb, 0, sizeof(endadb));
+
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY);
+	if (adb_control_bu_fd < 0) {
+		printf("Error opening adb_control_bu_fd\n");
+		return false;
+	}
+	strncpy(endadb.start_of_header, TWRP, sizeof(endadb.start_of_header));
+	strncpy(endadb.type, TWENDADB, sizeof(endadb.type));
+	endadb.crc = crc32(0L, Z_NULL, 0);
+	endadb.crc = crc32(endadb.crc, (const unsigned char*) &endadb, sizeof(endadb));
+	if (write(adb_control_bu_fd, &endadb, sizeof(endadb)) < 0) {
+		printf("Cannot write to ADB control.\n");
+		close(adb_control_bu_fd);
+		return false;
+	}
+	close(adb_control_bu_fd);
+	return true;
+}
+
+bool twadbbu::Write_TWFN(std::string Backup_FileName, uint64_t file_size, bool use_compression) {
+	int adb_control_bu_fd;
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+	struct twfilehdr twfilehdr;
+	strncpy(twfilehdr.start_of_header, TWRP, sizeof(twfilehdr.start_of_header));
+	strncpy(twfilehdr.type, TWFN, sizeof(twfilehdr.type));
+	strncpy(twfilehdr.name, Backup_FileName.c_str(), sizeof(twfilehdr.name));
+	twfilehdr.size = (file_size == 0 ? 1024 : file_size);
+	twfilehdr.compressed = use_compression;
+	twfilehdr.crc = crc32(0L, Z_NULL, 0);
+	twfilehdr.crc = crc32(twfilehdr.crc, (const unsigned char*) &twfilehdr, sizeof(twfilehdr));
+
+	printf("Sending TWFN to adb\n");
+	if (write(adb_control_bu_fd, &twfilehdr, sizeof(twfilehdr)) < 1) {
+		printf("Cannot that write to adb_control_bu_fd\n");
+		close(adb_control_bu_fd);
+		return false;
+	}
+	close(adb_control_bu_fd);
+	return true;
+}
+
+bool twadbbu::Write_TWIMG(std::string Backup_FileName, uint64_t file_size) {
+	int adb_control_bu_fd;
+	struct twfilehdr twimghdr;
+
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+	strncpy(twimghdr.start_of_header, TWRP, sizeof(twimghdr.start_of_header));
+	strncpy(twimghdr.type, TWIMG, sizeof(twimghdr.type));
+	twimghdr.size = file_size;
+	strncpy(twimghdr.name, Backup_FileName.c_str(), sizeof(twimghdr.name));
+	twimghdr.crc = crc32(0L, Z_NULL, 0);
+	twimghdr.crc = crc32(twimghdr.crc, (const unsigned char*) &twimghdr, sizeof(twimghdr));
+	printf("Sending TWIMG to adb\n");
+	if (write(adb_control_bu_fd, &twimghdr, sizeof(twimghdr)) < 1) {
+		printf("Cannot write to adb control channel\n");
+		return false;
+	}
+
+	return true;
+}
+
+bool twadbbu::Write_TWEOF() {
+	struct AdbBackupControlType tweof;
+	int adb_control_bu_fd;
+	int errctr = 0;
+
+	printf("opening TW_ADB_BU_CONTROL\n");
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+	while (adb_control_bu_fd < 0) {
+		printf("failed to open TW_ADB_BU_CONTROL. Retrying: %s\n", strerror(errno));
+		adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+		usleep(10000);
+		errctr++;
+		if (errctr > ADB_BU_MAX_ERROR) {
+			printf("Cannot write to adb_control_bu_fd: %s.\n", strerror(errno));
+			close(adb_control_bu_fd);
+			return false;
+		}
+	}
+	memset(&tweof, 0, sizeof(tweof));
+	strncpy(tweof.start_of_header, TWRP, sizeof(tweof.start_of_header));
+	strncpy(tweof.type, TWEOF, sizeof(tweof.type));
+	tweof.crc = crc32(0L, Z_NULL, 0);
+	tweof.crc = crc32(tweof.crc, (const unsigned char*) &tweof, sizeof(tweof));
+	printf("Sending TWEOF to adb backup\n");
+	if (write(adb_control_bu_fd, &tweof, sizeof(tweof)) < 0) {
+		printf("Cannot write to adb_control_bu_fd: %s.\n", strerror(errno));
+		close(adb_control_bu_fd);
+		return false;
+	}
+	close(adb_control_bu_fd);
+	return true;
+}
+
+bool twadbbu::Write_TWERROR() {
+	struct AdbBackupControlType twerror;
+	int adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+
+	strncpy(twerror.start_of_header, TWRP, sizeof(twerror.start_of_header));
+	strncpy(twerror.type, TWERROR, sizeof(twerror.type));
+	memset(twerror.space, 0, sizeof(twerror.space));
+	twerror.crc = crc32(0L, Z_NULL, 0);
+	twerror.crc = crc32(twerror.crc, (const unsigned char*) &twerror, sizeof(twerror));
+	if (write(adb_control_bu_fd, &twerror, sizeof(twerror)) < 0) {
+		printf("Cannot write to adb control channel");
+		return false;
+	}
+	close(adb_control_bu_fd);
+	return true;
+}
+
+bool twadbbu::Write_TWENDADB() {
+	struct AdbBackupControlType endadb;
+	int adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_WRONLY | O_NONBLOCK);
+
+	memset(&endadb, 0, sizeof(endadb));
+	strncpy(endadb.start_of_header, TWRP, sizeof(endadb.start_of_header));
+	strncpy(endadb.type, TWENDADB, sizeof(endadb.type));
+	endadb.crc = crc32(0L, Z_NULL, 0);
+	endadb.crc = crc32(endadb.crc, (const unsigned char*) &endadb, sizeof(endadb));
+
+	printf("Sending TWENDADB to ADB Backup\n");
+	if (write(adb_control_bu_fd, &endadb, sizeof(endadb)) < 1) {
+		printf("Cannot write to ADB_CONTROL_BU_FD: %s\n", strerror(errno));
+		return false;
+	}
+
+	close(adb_control_bu_fd);
+	return true;
+}
diff --git a/adbbu/libtwadbbu.hpp b/adbbu/libtwadbbu.hpp
new file mode 100644
index 000000000..bcd8b6aa3
--- /dev/null
+++ b/adbbu/libtwadbbu.hpp
@@ -0,0 +1,44 @@
+/*
+		Copyright 2013 to 2016 TeamWin
+		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/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <string>
+#include <fstream>
+#include <sstream>
+
+#include "twadbstream.h"
+#include "twrpback.hpp"
+
+class twadbbu {
+public:
+	static bool Write_ADB_Stream_Header(uint64_t partition_count);                                 //Write ADB Stream Header to stream
+	static bool Write_ADB_Stream_Trailer();                                                        //Write ADB Stream Trailer to stream
+	static bool Write_TWFN(std::string Backup_FileName, uint64_t file_size, bool use_compression); //Write a tar image to stream
+	static bool Write_TWIMG(std::string Backup_FileName, uint64_t file_size);                      //Write a partition image to stream
+	static bool Write_TWEOF();                                                                     //Write ADB End-Of-File marker to stream
+	static bool Write_TWERROR();                                                                   //Write error message occurred to stream
+	static bool Write_TWENDADB();                                                                  //Write ADB End-Of-Stream command to stream
+};
diff --git a/adbbu/twadbstream.h b/adbbu/twadbstream.h
new file mode 100644
index 000000000..4e76be165
--- /dev/null
+++ b/adbbu/twadbstream.h
@@ -0,0 +1,101 @@
+/*
+		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
diff --git a/adbbu/twrpback.cpp b/adbbu/twrpback.cpp
new file mode 100644
index 000000000..e22574b27
--- /dev/null
+++ b/adbbu/twrpback.cpp
@@ -0,0 +1,823 @@
+/*
+		Copyright 2013 to 2016 TeamWin
+		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/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <zlib.h>
+#include <ctype.h>
+#include <semaphore.h>
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <algorithm>
+
+#include "twadbstream.h"
+#include "twrpback.hpp"
+#include "../variables.h"
+#include "../twcommon.h"
+#include "../twrpDigest.hpp"
+
+twrpback::twrpback(void) {
+	read_fd = 0;
+	write_fd = 0;
+	adb_control_twrp_fd = 0;
+	adb_control_bu_fd = 0;
+	adb_read_fd = 0;
+	adb_write_fd = 0;
+	adb_write_fd = 0;
+	ors_fd = 0;
+	firstPart = true;
+	adbloginit();
+}
+
+twrpback::~twrpback(void) {
+	adblogfile.close();
+}
+
+void twrpback::adbloginit(void) {
+	adblogfile.open("/tmp/adb.log", std::fstream::app);
+}
+
+void twrpback::adblogwrite(std::string writemsg) {
+	adblogfile << writemsg << std::flush;
+}
+
+void twrpback::close_backup_fds() {
+	if (ors_fd > 0)
+		close(ors_fd);
+	if (write_fd > 0)
+		close(write_fd);
+	if (adb_read_fd > 0)
+		close(adb_read_fd);
+	if (adb_control_bu_fd > 0)
+		close(adb_control_bu_fd);
+	if (adbd_fp != NULL)
+		fclose(adbd_fp);
+	if (access(TW_ADB_BACKUP, F_OK) == 0)
+		unlink(TW_ADB_BACKUP);
+}
+
+void twrpback::close_restore_fds() {
+	if (ors_fd > 0)
+		close(ors_fd);
+	if (write_fd > 0)
+		close(write_fd);
+	if (adb_control_bu_fd > 0)
+		close(adb_control_bu_fd);
+	if (adb_control_twrp_fd > 0)
+		close(adb_control_twrp_fd);
+	if (adbd_fp != NULL)
+		fclose(adbd_fp);
+	if (access(TW_ADB_RESTORE, F_OK) == 0)
+		unlink(TW_ADB_RESTORE);
+}
+
+int twrpback::backup(std::string command) {
+	twrpDigest adb_md5;
+	bool breakloop = false;
+	int bytes = 0, errctr = 0;
+	char result[MAX_ADB_READ];
+	uint64_t totalbytes = 0, dataChunkBytes = 0;
+	int64_t count = -1;			// Count of how many blocks set
+	uint64_t md5fnsize = 0;
+	struct AdbBackupControlType endadb;
+
+	ADBSTRUCT_STATIC_ASSERT(sizeof(endadb) == MAX_ADB_READ);
+
+	bool writedata = true;
+	bool compressed = false;
+	bool firstDataPacket = true;
+
+	adbd_fp = fdopen(adbd_fd, "w");
+	if (adbd_fp == NULL) {
+		adblogwrite("Unable to open adb_fp\n");
+		return -1;
+	}
+
+	if (mkfifo(TW_ADB_BACKUP, 0666) < 0) {
+		adblogwrite("Unable to create TW_ADB_BACKUP fifo\n");
+		return -1;
+	}
+
+	adblogwrite("opening ORS_INPUT_FILE\n");
+	write_fd = open(ORS_INPUT_FILE, O_WRONLY);
+	while (write_fd < 0) {
+		write_fd = open(ORS_INPUT_FILE, O_WRONLY);
+		usleep(10000);
+		errctr++;
+		if (errctr > ADB_BU_MAX_ERROR) {
+			adblogwrite("Unable to open ORS_INPUT_FILE\n");
+			close_backup_fds();
+			return -1;
+		}
+	}
+
+	sprintf(operation, "adbbackup %s", command.c_str());
+	if (write(write_fd, operation, sizeof(operation)) != sizeof(operation)) {
+		adblogwrite("Unable to write to ORS_INPUT_FILE\n");
+		close_backup_fds();
+		return -1;
+	}
+
+	adblogwrite("opening ORS_OUTPUT_FILE\n");
+	ors_fd = open(ORS_OUTPUT_FILE, O_RDONLY);
+	if (ors_fd < 0) {
+		adblogwrite("Unable to open ORS_OUTPUT_FILE\n");
+		close_backup_fds();
+		return -1;
+	}
+
+	memset(&result, 0, sizeof(result));
+	memset(&cmd, 0, sizeof(cmd));
+
+	adblogwrite("opening TW_ADB_BU_CONTROL\n");
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_RDONLY | O_NONBLOCK);
+	if (adb_control_bu_fd < 0) {
+		adblogwrite("Unable to open TW_ADB_BU_CONTROL for reading.\n");
+		close_backup_fds();
+		return -1;
+	}
+
+	adblogwrite("opening TW_ADB_BACKUP\n");
+	adb_read_fd = open(TW_ADB_BACKUP, O_RDONLY | O_NONBLOCK);
+	if (adb_read_fd < 0) {
+		adblogwrite("Unable to open TW_ADB_BACKUP for reading.\n");
+		close_backup_fds();
+		return -1;
+	}
+
+	//loop until TWENDADB sent
+	while (!breakloop) {
+		if (read(adb_control_bu_fd, &cmd, sizeof(cmd)) > 0) {
+			struct AdbBackupControlType structcmd;
+
+			memcpy(&structcmd, cmd, sizeof(cmd));
+			std::string cmdstr(structcmd.type);
+			std::string cmdtype = cmdstr.substr(0, sizeof(structcmd.type) - 1);
+
+			//we received an error, exit and unlink
+			if (cmdtype == TWERROR) {
+				writedata = false;
+				adblogwrite("Error received. Quitting...\n");
+				close_backup_fds();
+				return -1;
+			}
+			//we received the end of adb backup stream so we should break the loop
+			else if (cmdtype == TWENDADB) {
+				writedata = false;
+				adblogwrite("Recieved TWENDADB\n");
+				memcpy(&endadb, cmd, sizeof(cmd));
+				stringstream str;
+				str << totalbytes;
+				adblogwrite(str.str() + " total bytes written\n");
+				breakloop = true;
+			}
+			//we recieved the TWSTREAMHDR structure metadata to write to adb
+			else if (cmdtype == TWSTREAMHDR) {
+				writedata = false;
+				adblogwrite("Writing TWSTREAMHDR\n");
+				if (fwrite(cmd, 1, sizeof(cmd), adbd_fp) != sizeof(cmd)) {
+					stringstream str;
+					str << strerror(errno);
+					adblogwrite("Error writing TWSTREAMHDR to adbd" + str.str() + "\n");
+					close_backup_fds();
+					return -1;
+				}
+				fflush(adbd_fp);
+			}
+			//we will be writing an image from TWRP
+			else if (cmdtype == TWIMG) {
+				struct twfilehdr twimghdr;
+
+				adblogwrite("Writing TWIMG\n");
+				adb_md5.initMD5();
+
+				memset(&twimghdr, 0, sizeof(twimghdr));
+				memcpy(&twimghdr, cmd, sizeof(cmd));
+				md5fnsize = twimghdr.size;
+
+				if (fwrite(cmd, 1, sizeof(cmd), adbd_fp)  != sizeof(cmd)) {
+					adblogwrite("Error writing TWIMG to adbd\n");
+					close_backup_fds();
+					return -1;
+				}
+				fflush(adbd_fp);
+				writedata = true;
+			}
+			//we will be writing a tar from TWRP
+			else if (cmdtype == TWFN) {
+				struct twfilehdr twfilehdr;
+
+				adblogwrite("Writing TWFN\n");
+				adb_md5.initMD5();
+
+				ADBSTRUCT_STATIC_ASSERT(sizeof(twfilehdr) == MAX_ADB_READ);
+
+				memset(&twfilehdr, 0, sizeof(twfilehdr));
+				memcpy(&twfilehdr, cmd, sizeof(cmd));
+				md5fnsize = twfilehdr.size;
+
+				compressed = twfilehdr.compressed == 1 ? true: false;
+
+				if (fwrite(cmd, 1, sizeof(cmd), adbd_fp) != sizeof(cmd)) {
+					adblogwrite("Error writing TWFN to adbd\n");
+					close_backup_fds();
+					return -1;
+				}
+				fflush(adbd_fp);
+				writedata = true;
+			}
+			/*
+			We received the command that we are done with the file stream.
+			We will flush the remaining data stream.
+			Update md5 and write final results to adb stream.
+			If we need padding because the total bytes are not a multiple
+			of 512, we pad the end with 0s to we reach 512.
+			We also write the final md5 to the adb stream.
+			*/
+			else if (cmdtype == TWEOF) {
+				adblogwrite("received TWEOF\n");
+				count = totalbytes / MAX_ADB_READ + 1;
+				count = count * MAX_ADB_READ;
+
+				while ((bytes = read(adb_read_fd, &result, sizeof(result))) == MAX_ADB_READ) {
+					totalbytes += bytes;
+					char *writeresult = new char [bytes];
+					memcpy(writeresult, result, bytes);
+					if (adb_md5.updateMD5stream((unsigned char *) writeresult, bytes) == -1)
+						adblogwrite("failed to update md5 stream\n");
+					if (fwrite(writeresult, 1, bytes, adbd_fp) != bytes) {
+						adblogwrite("Error writing backup data to adbd\n");
+						close_backup_fds();
+						return -1;
+					}
+					fflush(adbd_fp);
+					delete [] writeresult;
+					memset(&result, 0, sizeof(result));
+				}
+
+				if ((totalbytes % MAX_ADB_READ) != 0) {
+					adblogwrite("writing padding to stream\n");
+					char padding[count - totalbytes];
+					memset(padding, 0, sizeof(padding));
+					if (fwrite(padding, 1, sizeof(padding), adbd_fp) != sizeof(padding)) {
+						adblogwrite("Error writing padding to adbd\n");
+						close_backup_fds();
+						return -1;
+					}
+					if (adb_md5.updateMD5stream((unsigned char *) padding, sizeof(padding)) == -1)
+						adblogwrite("failed to update md5 stream\n");
+					fflush(adbd_fp);
+					totalbytes = 0;
+				}
+
+				AdbBackupFileTrailer md5trailer;
+
+				memset(&md5trailer, 0, sizeof(md5trailer));
+				adb_md5.finalizeMD5stream();
+
+				std::string md5string = adb_md5.createMD5string();
+
+				strncpy(md5trailer.start_of_trailer, TWRP, sizeof(md5trailer.start_of_trailer));
+				strncpy(md5trailer.type, MD5TRAILER, sizeof(md5trailer.type));
+				strncpy(md5trailer.md5, md5string.c_str(), sizeof(md5trailer.md5));
+
+				md5trailer.crc = crc32(0L, Z_NULL, 0);
+				md5trailer.crc = crc32(md5trailer.crc, (const unsigned char*) &md5trailer, sizeof(md5trailer));
+
+				md5trailer.ident = crc32(0L, Z_NULL, 0);
+				md5trailer.ident = crc32(md5trailer.ident, (const unsigned char*) &md5trailer, sizeof(md5trailer));
+				md5trailer.ident = crc32(md5trailer.ident, (const unsigned char*) &md5fnsize, sizeof(md5fnsize));
+
+				if (fwrite(&md5trailer, 1, sizeof(md5trailer), adbd_fp) != sizeof(md5trailer))  {
+					adblogwrite("Error writing md5trailer to adbd\n");
+					close_backup_fds();
+					return -1;
+				}
+				fflush(adbd_fp);
+				writedata = false;
+				firstDataPacket = true;
+			}
+			memset(&cmd, 0, sizeof(cmd));
+		}
+		//If we are to write data because of a new file stream, lets write all the data.
+		//This will allow us to not write data after a command structure has been written
+		//to the adb stream.
+		//If the stream is compressed, we need to always write the data.
+		if (writedata || compressed) {
+			while ((bytes = read(adb_read_fd, &result, sizeof(result))) == MAX_ADB_READ) {
+				if (firstDataPacket) {
+					struct AdbBackupControlType data_block;
+
+					memset(&data_block, 0, sizeof(data_block));
+					strncpy(data_block.start_of_header, TWRP, sizeof(data_block.start_of_header));
+					strncpy(data_block.type, TWDATA, sizeof(data_block.type));
+					data_block.crc = crc32(0L, Z_NULL, 0);
+					data_block.crc = crc32(data_block.crc, (const unsigned char*) &data_block, sizeof(data_block));
+					if (fwrite(&data_block, 1, sizeof(data_block), adbd_fp) != sizeof(data_block))  {
+						adblogwrite("Error writing data_block to adbd\n");
+						close_backup_fds();
+						return -1;
+					}
+					fflush(adbd_fp);
+					firstDataPacket = false;
+				}
+				char *writeresult = new char [bytes];
+				memcpy(writeresult, result, bytes);
+
+				if (adb_md5.updateMD5stream((unsigned char *) writeresult, bytes) == -1)
+					adblogwrite("failed to update md5 stream\n");
+
+				totalbytes += bytes;
+				dataChunkBytes += bytes;
+
+				if (fwrite(writeresult, 1, bytes, adbd_fp) != bytes) {
+					adblogwrite("Error writing backup data to adbd\n");
+					close_backup_fds();
+					return -1;
+				}
+				fflush(adbd_fp);
+
+				delete [] writeresult;
+				memset(&result, 0, sizeof(result));
+				if (dataChunkBytes == DATA_MAX_CHUNK_SIZE - sizeof(result)) {
+					struct AdbBackupControlType data_block;
+
+					memset(&data_block, 0, sizeof(data_block));
+					strncpy(data_block.start_of_header, TWRP, sizeof(data_block.start_of_header));
+					strncpy(data_block.type, TWDATA, sizeof(data_block.type));
+					data_block.crc = crc32(0L, Z_NULL, 0);
+					data_block.crc = crc32(data_block.crc, (const unsigned char*) &data_block, sizeof(data_block));
+					if (fwrite(&data_block, 1, sizeof(data_block), adbd_fp) != sizeof(data_block))  {
+						adblogwrite("Error writing data_block to adbd\n");
+						close_backup_fds();
+						return -1;
+					}
+					fflush(adbd_fp);
+					dataChunkBytes = 0;
+				}
+
+			}
+			compressed = false;
+		}
+	}
+
+	//Write the final end adb structure to the adb stream
+	if (fwrite(&endadb, 1, sizeof(endadb), adbd_fp) != sizeof(endadb)) {
+		adblogwrite("Error writing endadb to adbd\n");
+		close_backup_fds();
+		return -1;
+	}
+	fflush(adbd_fp);
+	close_backup_fds();
+	return 0;
+}
+
+int twrpback::restore(void) {
+	twrpDigest adb_md5;
+	char cmd[MAX_ADB_READ];
+	char result[MAX_ADB_READ];
+	struct AdbBackupControlType structcmd;
+	int adb_control_twrp_fd, errctr = 0;
+	uint64_t totalbytes = 0, dataChunkBytes = 0;
+	uint64_t md5fnsize = 0;
+	bool writedata, read_from_adb;
+	bool breakloop, eofsent, md5trsent;
+
+	breakloop = false;
+	read_from_adb = true;
+
+	signal(SIGPIPE, SIG_IGN);
+
+	adbd_fp = fdopen(adbd_fd, "r");
+	if (adbd_fp == NULL) {
+		adblogwrite("Unable to open adb_fp\n");
+		close_restore_fds();
+		return -1;
+	}
+
+	if(mkfifo(TW_ADB_RESTORE, 0666)) {
+		adblogwrite("Unable to create TW_ADB_RESTORE fifo\n");
+		close_restore_fds();
+		return -1;
+	}
+
+	adblogwrite("opening ORS_INPUT_FILE\n");
+	write_fd = open(ORS_INPUT_FILE, O_WRONLY);
+
+	while (write_fd < 0) {
+		write_fd = open(ORS_INPUT_FILE, O_WRONLY);
+		errctr++;
+		if (errctr > ADB_BU_MAX_ERROR) {
+			adblogwrite("Unable to open ORS_INPUT_FILE\n");
+			close_restore_fds();
+			return -1;
+		}
+	}
+
+	sprintf(operation, "adbrestore");
+	if (write(write_fd, operation, sizeof(operation)) != sizeof(operation)) {
+		adblogwrite("Unable to write to ORS_INPUT_FILE\n");
+		close_restore_fds();
+		return -1;
+	}
+
+	ors_fd = open(ORS_OUTPUT_FILE, O_RDONLY);
+	if (ors_fd < 0) {
+		stringstream str;
+		str << strerror(errno);
+		adblogwrite("Unable to write to ORS_OUTPUT_FILE: " + str.str() + "\n");
+		close_restore_fds();
+		return -1;
+	}
+
+	memset(&result, 0, sizeof(result));
+	memset(&cmd, 0, sizeof(cmd));
+
+	adblogwrite("opening TW_ADB_BU_CONTROL\n");
+	adb_control_bu_fd = open(TW_ADB_BU_CONTROL, O_RDONLY | O_NONBLOCK);
+	if (adb_control_bu_fd < 0) {
+		stringstream str;
+		str << strerror(errno);
+		adblogwrite("Unable to open TW_ADB_BU_CONTROL for writing. " + str.str() + "\n");
+		close_restore_fds();
+		return -1;
+	}
+
+	adblogwrite("opening TW_ADB_TWRP_CONTROL\n");
+	adb_control_twrp_fd = open(TW_ADB_TWRP_CONTROL, O_WRONLY | O_NONBLOCK);
+	if (adb_control_twrp_fd < 0) {
+		stringstream str;
+		str << strerror(errno);
+		adblogwrite("Unable to open TW_ADB_TWRP_CONTROL for writing. " + str.str() + ". Retrying...\n");
+		while (adb_control_twrp_fd < 0) {
+			adb_control_twrp_fd = open(TW_ADB_TWRP_CONTROL, O_WRONLY | O_NONBLOCK);
+			usleep(10000);
+			errctr++;
+			if (errctr > ADB_BU_MAX_ERROR) {
+				adblogwrite("Unable to open TW_ADB_TWRP_CONTROL\n");
+				close_backup_fds();
+				return -1;
+			}
+		}
+	}
+
+	//Loop until we receive TWENDADB from TWRP
+	while (!breakloop) {
+		memset(&cmd, 0, sizeof(cmd));
+		if (read(adb_control_bu_fd, &cmd, sizeof(cmd)) > 0) {
+			struct AdbBackupControlType structcmd;
+			memcpy(&structcmd, cmd, sizeof(cmd));
+			std::string cmdstr(structcmd.type);
+			std::string cmdtype = cmdstr.substr(0, sizeof(structcmd.type) - 1);
+
+			//If we receive TWEOF from TWRP close adb data fifo
+			if (cmdtype == TWEOF) {
+				adblogwrite("Received TWEOF\n");
+				struct AdbBackupControlType tweof;
+
+				memset(&tweof, 0, sizeof(tweof));
+				memcpy(&tweof, result, sizeof(result));
+				read_from_adb = true;
+			}
+			//Break when TWRP sends TWENDADB
+			else if (cmdtype == TWENDADB) {
+				adblogwrite("Received TWENDADB\n");
+				breakloop = true;
+				close_restore_fds();
+			}
+			//we received an error, exit and unlink
+			else if (cmdtype == TWERROR) {
+				adblogwrite("Error received. Quitting...\n");
+				close_restore_fds();
+				return -1;
+			}
+		}
+
+		//If we should read from the adb stream, write commands and data to TWRP
+		if (read_from_adb) {
+			std::string cmdstr;
+			int readbytes;
+			if ((readbytes = fread(result, 1, sizeof(result), adbd_fp)) == sizeof(result)) {
+				totalbytes += readbytes;
+				memcpy(&structcmd, result, sizeof(result));
+				cmdstr = structcmd.type;
+				std::string cmdtype = cmdstr.substr(0, sizeof(structcmd.type) - 1);
+
+				//Tell TWRP we have read the entire adb stream
+				if (cmdtype == TWENDADB) {
+					struct AdbBackupControlType endadb;
+					uint32_t crc, endadbcrc;
+
+					totalbytes -= sizeof(result);
+					memset(&endadb, 0, sizeof(endadb));
+					memcpy(&endadb, result, sizeof(result));
+					endadbcrc = endadb.crc;
+					memset(&endadb.crc, 0, sizeof(endadb.crc));
+					crc = crc32(0L, Z_NULL, 0);
+					crc = crc32(crc, (const unsigned char*) &endadb, sizeof(endadb));
+
+					if (crc == endadbcrc) {
+						adblogwrite("Sending TWENDADB\n");
+						if (write(adb_control_twrp_fd, &endadb, sizeof(endadb)) < 1) {
+							stringstream str;
+							str << strerror(errno);
+							adblogwrite("Cannot write to ADB_CONTROL_READ_FD: " + str.str() + "\n");
+							close_restore_fds();
+							return -1;
+						}
+					}
+					else {
+						adblogwrite("ADB TWENDADB crc header doesn't match\n");
+						close_restore_fds();
+						return -1;
+					}
+				}
+				//Send TWRP partition metadata
+				else if (cmdtype == TWSTREAMHDR) {
+					struct AdbBackupStreamHeader cnthdr;
+					uint32_t crc, cnthdrcrc;
+
+					ADBSTRUCT_STATIC_ASSERT(sizeof(cnthdr) == MAX_ADB_READ);
+					totalbytes -= sizeof(result);
+
+					memset(&cnthdr, 0, sizeof(cnthdr));
+					memcpy(&cnthdr, result, sizeof(result));
+					cnthdrcrc = cnthdr.crc;
+					memset(&cnthdr.crc, 0, sizeof(cnthdr.crc));
+					crc = crc32(0L, Z_NULL, 0);
+					crc = crc32(crc, (const unsigned char*) &cnthdr, sizeof(cnthdr));
+
+					if (crc == cnthdrcrc) {
+						adblogwrite("Restoring TWSTREAMHDR\n");
+						if (write(adb_control_twrp_fd, result, sizeof(result)) < 0) {
+							stringstream str;
+							str << strerror(errno);
+							adblogwrite("Cannot write to adb_control_twrp_fd: " + str.str() + "\n");
+							close_restore_fds();
+							return -1;
+						}
+					}
+					else {
+						adblogwrite("ADB TWSTREAMHDR crc header doesn't match\n");
+						close_restore_fds();
+						return -1;
+					}
+				}
+				//Tell TWRP we are sending a partition image
+				else if (cmdtype == TWIMG) {
+					struct twfilehdr twimghdr;
+					uint32_t crc, twimghdrcrc;
+
+					totalbytes -= sizeof(result);
+					adb_md5.initMD5();
+					adblogwrite("Restoring TWIMG\n");
+					memset(&twimghdr, 0, sizeof(twimghdr));
+					memcpy(&twimghdr, result, sizeof(result));
+					md5fnsize = twimghdr.size;
+					twimghdrcrc = twimghdr.crc;
+					memset(&twimghdr.crc, 0, sizeof(twimghdr.crc));
+
+					crc = crc32(0L, Z_NULL, 0);
+					crc = crc32(crc, (const unsigned char*) &twimghdr, sizeof(twimghdr));
+					if (crc == twimghdrcrc) {
+						if (write(adb_control_twrp_fd, result, sizeof(result)) < 1) {
+							stringstream str;
+							str << strerror(errno);
+							adblogwrite("Cannot write to adb_control_twrp_fd: " + str.str() + "\n");
+							close_restore_fds();
+							return -1;
+						}
+					}
+					else {
+						adblogwrite("ADB TWIMG crc header doesn't match\n");
+						close_restore_fds();
+						return -1;
+					}
+					adblogwrite("opening TW_ADB_RESTORE\n");
+					adb_write_fd = open(TW_ADB_RESTORE, O_WRONLY);
+				}
+				//Tell TWRP we are sending a tar stream
+				else if (cmdtype == TWFN) {
+					struct twfilehdr twfilehdr;
+					uint32_t crc, twfilehdrcrc;
+
+					totalbytes -= sizeof(result);
+					adb_md5.initMD5();
+					adblogwrite("Restoring TWFN\n");
+					memset(&twfilehdr, 0, sizeof(twfilehdr));
+					memcpy(&twfilehdr, result, sizeof(result));
+					md5fnsize = twfilehdr.size;
+					twfilehdrcrc = twfilehdr.crc;
+					memset(&twfilehdr.crc, 0, sizeof(twfilehdr.crc));
+
+					crc = crc32(0L, Z_NULL, 0);
+					crc = crc32(crc, (const unsigned char*) &twfilehdr, sizeof(twfilehdr));
+
+					if (crc == twfilehdrcrc) {
+						if (write(adb_control_twrp_fd, result, sizeof(result)) < 1) {
+							stringstream str;
+							str << strerror(errno);
+							adblogwrite("Cannot write to adb_control_twrp_fd: " + str.str() + "\n");
+							close_restore_fds();
+							return -1;
+						}
+					}
+					else {
+						adblogwrite("ADB TWFN crc header doesn't match\n");
+						close_restore_fds();
+						return -1;
+					}
+
+					adblogwrite("opening TW_ADB_RESTORE\n");
+					adb_write_fd = open(TW_ADB_RESTORE, O_WRONLY);
+				}
+				//Send the tar or partition image md5 to TWRP
+				else if (cmdtype == TWDATA) {
+					totalbytes -= sizeof(result);
+					while (1) {
+						if ((readbytes = fread(result, 1, sizeof(result), adbd_fp)) != sizeof(result)) {
+							close_restore_fds();
+							return -1;
+						}
+						totalbytes += readbytes;
+						memcpy(&structcmd, result, sizeof(result));
+						cmdstr = structcmd.type;
+
+						if (cmdstr.substr(0, sizeof(MD5TRAILER) - 1) == MD5TRAILER) {
+							struct AdbBackupFileTrailer md5tr;
+							uint32_t crc, md5trcrc, md5ident, md5identmatch;
+
+							ADBSTRUCT_STATIC_ASSERT(sizeof(md5tr) == MAX_ADB_READ);
+							memset(&md5tr, 0, sizeof(md5tr));
+							memcpy(&md5tr, result, sizeof(result));
+							md5ident = md5tr.ident;
+
+							memset(&md5tr.ident, 0, sizeof(md5tr.ident));
+
+							md5identmatch = crc32(0L, Z_NULL, 0);
+							md5identmatch = crc32(md5identmatch, (const unsigned char*) &md5tr, sizeof(md5tr));
+							md5identmatch = crc32(md5identmatch, (const unsigned char*) &md5fnsize, sizeof(md5fnsize));
+
+							if (md5identmatch == md5ident) {
+								totalbytes -= sizeof(result);
+								close(adb_write_fd);
+								adblogwrite("Restoring MD5TRAILER\n");
+								md5trcrc = md5tr.crc;
+								memset(&md5tr.crc, 0, sizeof(md5tr.crc));
+								crc = crc32(0L, Z_NULL, 0);
+								crc = crc32(crc, (const unsigned char*) &md5tr, sizeof(md5tr));
+								if (crc == md5trcrc) {
+									if (write(adb_control_twrp_fd, result, sizeof(result)) < 1) {
+										stringstream str;
+										str << strerror(errno);
+										adblogwrite("Cannot write to adb_control_twrp_fd: " + str.str() + "\n");
+										close_restore_fds();
+										return -1;
+									}
+								}
+								else {
+									adblogwrite("ADB MD5TRAILER crc header doesn't match\n");
+									close_restore_fds();
+									return -1;
+								}
+								adblogwrite("md5 finalize stream\n");
+								adb_md5.finalizeMD5stream();
+
+								AdbBackupFileTrailer md5;
+
+								memset(&md5, 0, sizeof(md5));
+								strncpy(md5.start_of_trailer, TWRP, sizeof(md5.start_of_trailer));
+								strncpy(md5.type, TWMD5, sizeof(md5.type));
+								std::string md5string = adb_md5.createMD5string();
+								strncpy(md5.md5, md5string.c_str(), sizeof(md5.md5));
+
+								adblogwrite("Sending MD5Check\n");
+								if (write(adb_control_twrp_fd, &md5, sizeof(md5)) < 1) {
+									stringstream str;
+									str << strerror(errno);
+									adblogwrite("Cannot write to adb_control_twrp_fd: " + str.str() + "\n");
+									close_restore_fds();
+									return -1;
+								}
+								read_from_adb = false; //don't read from adb until TWRP sends TWEOF
+								break;
+							}
+						}
+						if (adb_md5.updateMD5stream((unsigned char*)result, sizeof(result)) == -1)
+							adblogwrite("failed to update md5 stream\n");
+						dataChunkBytes += readbytes;
+
+						if (write(adb_write_fd, result, sizeof(result)) < 0) {
+							stringstream str;
+							str << strerror(errno);
+							adblogwrite("Cannot write to adb_write_fd\n" + str.str() + ". Retrying.\n");
+							while(write(adb_write_fd, result, sizeof(result)) < 0) {
+								adblogwrite("Cannot write to adb_write_fd\n" + str.str() + ". Retrying.\n");
+								continue;
+							}
+						}
+						if (dataChunkBytes == ((DATA_MAX_CHUNK_SIZE) - sizeof(result))) {
+							dataChunkBytes = 0;
+							break;
+						}
+						memset(&result, 0, sizeof(result));
+					}
+				}
+			}
+		}
+	}
+
+	stringstream str;
+	str << totalbytes;
+	adblogwrite(str.str() + " bytes restored from adbbackup\n");
+	return 0;
+}
+
+int main(int argc, char **argv) {
+	int index;
+	int ret = 0, pos = 0;
+	std::string command;
+	twrpback tw;
+
+	tw.adblogwrite("Starting adb backup and restore\n");
+	if (mkfifo(TW_ADB_BU_CONTROL, 0666) < 0) {
+		stringstream str;
+		str << strerror(errno);
+		tw.adblogwrite("Unable to create TW_ADB_BU_CONTROL fifo: " + str.str() + "\n");
+		unlink(TW_ADB_BU_CONTROL);
+		return -1;
+	}
+	if (mkfifo(TW_ADB_TWRP_CONTROL, 0666) < 0) {
+		stringstream str;
+		str << strerror(errno);
+		tw.adblogwrite("Unable to create TW_ADB_TWRP_CONTROL fifo: " + str.str() + "\n");
+		unlink(TW_ADB_TWRP_CONTROL);
+		unlink(TW_ADB_BU_CONTROL);
+		return -1;
+	}
+
+	command = argv[1];
+	for (index = 2; index < argc; index++) {
+		command = command + " " + argv[index];
+	}
+
+	pos = command.find("backup");
+	if (pos < 0) {
+		pos = command.find("restore");
+	}
+	command.erase(0, pos);
+	command.erase(std::remove(command.begin(), command.end(), '\''), command.end());
+	tw.adblogwrite("command: " + command + "\n");
+
+	if (command.substr(0, sizeof("backup") - 1) == "backup") {
+		tw.adblogwrite("Starting adb backup\n");
+		if (isdigit(*argv[1]))
+			tw.adbd_fd = atoi(argv[1]);
+		else
+			tw.adbd_fd = 1;
+		ret = tw.backup(command);
+	}
+	else if (command.substr(0, sizeof("restore") - 1) == "restore") {
+		tw.adblogwrite("Starting adb restore\n");
+		if (isdigit(*argv[1]))
+			tw.adbd_fd = atoi(argv[1]);
+		else
+			tw.adbd_fd = 0;
+		ret = tw.restore();
+	}
+	if (ret == 0)
+		tw.adblogwrite("Adb backup/restore completed\n");
+	else
+		tw.adblogwrite("Adb backup/restore failed\n");
+
+	if (unlink(TW_ADB_BU_CONTROL) < 0) {
+		stringstream str;
+		str << strerror(errno);
+		tw.adblogwrite("Unable to remove TW_ADB_BU_CONTROL: " + str.str());
+	}
+	unlink(TW_ADB_TWRP_CONTROL);
+	return ret;
+}
diff --git a/adbbu/twrpback.hpp b/adbbu/twrpback.hpp
new file mode 100644
index 000000000..752d35ea1
--- /dev/null
+++ b/adbbu/twrpback.hpp
@@ -0,0 +1,49 @@
+/*
+		Copyright 2013 to 2016 TeamWin
+		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/>.
+*/
+
+#include <fstream>
+
+#include "../orscmd/orscmd.h"
+#include "../variables.h"
+#include "../twcommon.h"
+
+class twrpback {
+public:
+	int adbd_fd;                                                             // adbd data stream
+
+	twrpback(void);
+	virtual ~twrpback(void);
+	int backup(std::string command);                                         // adb backup stream
+	int restore(void);                                                       // adb restore stream
+	void adblogwrite(std::string writemsg);                                  // adb debugging log function
+	void close_backup_fds();                                                 // close backup resources
+	void close_restore_fds();                                                // close restore resources
+
+private:
+	int read_fd;                                                             // ors input fd
+	int write_fd;                                                            // ors operation fd
+	int ors_fd;                                                              // ors output fd
+	int adb_control_twrp_fd;                                                 // fd for bu to twrp communication
+	int adb_control_bu_fd;                                                   // fd for twrp to bu communication
+	int adb_read_fd;                                                         // adb read data stream
+	int adb_write_fd;                                                        // adb write data stream
+	bool firstPart;                                                          // first partition in the stream
+	FILE *adbd_fp;                                                           // file pointer for adb stream
+	char cmd[512];                                                           // store result of commands
+	char operation[512];                                                     // operation to send to ors
+	std::ofstream adblogfile;                                                // adb stream log file
+	void adbloginit(void);                                                   // setup adb log stream file
+};