mtp/MtpDataPacket.cpp

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright (C) 2014 TeamWin - bigbiff and Dees_Troy mtp database conversion to c++
 *
 */

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>

#include <usbhost/usbhost.h>

#include "MtpDataPacket.h"
#include "MtpStringBuffer.h"
#include "MtpDebug.h"

#define MTP_BUFFER_SIZE 16384


MtpDataPacket::MtpDataPacket()
	:   MtpPacket(MTP_BUFFER_SIZE),   // MAX_USBFS_BUFFER_SIZE
		mOffset(MTP_CONTAINER_HEADER_SIZE)
{
}

MtpDataPacket::~MtpDataPacket() {
}

void MtpDataPacket::reset() {
	MtpPacket::reset();
	mOffset = MTP_CONTAINER_HEADER_SIZE;
}

void MtpDataPacket::setOperationCode(MtpOperationCode code) {
	MtpPacket::putUInt16(MTP_CONTAINER_CODE_OFFSET, code);
}

void MtpDataPacket::setTransactionID(MtpTransactionID id) {
	MtpPacket::putUInt32(MTP_CONTAINER_TRANSACTION_ID_OFFSET, id);
}

uint16_t MtpDataPacket::getUInt16() {
	int offset = mOffset;
	uint16_t result = (uint16_t)mBuffer[offset] | ((uint16_t)mBuffer[offset + 1] << 8);
	mOffset += 2;
	return result;
}

uint32_t MtpDataPacket::getUInt32() {
	int offset = mOffset;
	uint32_t result = (uint32_t)mBuffer[offset] | ((uint32_t)mBuffer[offset + 1] << 8) |
		   ((uint32_t)mBuffer[offset + 2] << 16)  | ((uint32_t)mBuffer[offset + 3] << 24);
	mOffset += 4;
	return result;
}

uint64_t MtpDataPacket::getUInt64() {
	int offset = mOffset;
	uint64_t result = (uint64_t)mBuffer[offset] | ((uint64_t)mBuffer[offset + 1] << 8) |
		   ((uint64_t)mBuffer[offset + 2] << 16) | ((uint64_t)mBuffer[offset + 3] << 24) |
		   ((uint64_t)mBuffer[offset + 4] << 32) | ((uint64_t)mBuffer[offset + 5] << 40) |
		   ((uint64_t)mBuffer[offset + 6] << 48)  | ((uint64_t)mBuffer[offset + 7] << 56);
	mOffset += 8;
	return result;
}

void MtpDataPacket::getUInt128(uint128_t& value) {
	value[0] = getUInt32();
	value[1] = getUInt32();
	value[2] = getUInt32();
	value[3] = getUInt32();
}

void MtpDataPacket::getString(MtpStringBuffer& string)
{
	string.readFromPacket(this);
}

Int8List* MtpDataPacket::getAInt8() {
	Int8List* result = new Int8List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getInt8());
	return result;
}

UInt8List* MtpDataPacket::getAUInt8() {
	UInt8List* result = new UInt8List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getUInt8());
	return result;
}

Int16List* MtpDataPacket::getAInt16() {
	Int16List* result = new Int16List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getInt16());
	return result;
}

UInt16List* MtpDataPacket::getAUInt16() {
	UInt16List* result = new UInt16List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getUInt16());
	return result;
}

Int32List* MtpDataPacket::getAInt32() {
	Int32List* result = new Int32List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getInt32());
	return result;
}

UInt32List* MtpDataPacket::getAUInt32() {
	UInt32List* result = new UInt32List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getUInt32());
	return result;
}

Int64List* MtpDataPacket::getAInt64() {
	Int64List* result = new Int64List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getInt64());
	return result;
}

UInt64List* MtpDataPacket::getAUInt64() {
	UInt64List* result = new UInt64List;
	int count = getUInt32();
	for (int i = 0; i < count; i++)
		result->push(getUInt64());
	return result;
}

void MtpDataPacket::putInt8(int8_t value) {
	allocate(mOffset + 1);
	mBuffer[mOffset++] = (uint8_t)value;
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putUInt8(uint8_t value) {
	allocate(mOffset + 1);
	mBuffer[mOffset++] = (uint8_t)value;
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putInt16(int16_t value) {
	allocate(mOffset + 2);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putUInt16(uint16_t value) {
	allocate(mOffset + 2);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putInt32(int32_t value) {
	allocate(mOffset + 4);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putUInt32(uint32_t value) {
	allocate(mOffset + 4);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putInt64(int64_t value) {
	allocate(mOffset + 8);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 32) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 40) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 48) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 56) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putUInt64(uint64_t value) {
	allocate(mOffset + 8);
	mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 32) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 40) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 48) & 0xFF);
	mBuffer[mOffset++] = (uint8_t)((value >> 56) & 0xFF);
	if (mPacketSize < mOffset)
		mPacketSize = mOffset;
}

void MtpDataPacket::putInt128(const int128_t& value) {
	putInt32(value[0]);
	putInt32(value[1]);
	putInt32(value[2]);
	putInt32(value[3]);
}

void MtpDataPacket::putUInt128(const uint128_t& value) {
	putUInt32(value[0]);
	putUInt32(value[1]);
	putUInt32(value[2]);
	putUInt32(value[3]);
}

void MtpDataPacket::putInt128(int64_t value) {
	putInt64(value);
	putInt64(value < 0 ? -1 : 0);
}

void MtpDataPacket::putUInt128(uint64_t value) {
	putUInt64(value);
	putUInt64(0);
}

void MtpDataPacket::putAInt8(const int8_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putInt8(*values++);
}

void MtpDataPacket::putAUInt8(const uint8_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putUInt8(*values++);
}

void MtpDataPacket::putAInt16(const int16_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putInt16(*values++);
}

void MtpDataPacket::putAUInt16(const uint16_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putUInt16(*values++);
}

void MtpDataPacket::putAUInt16(const UInt16List* values) {
	size_t count = (values ? values->size() : 0);
	putUInt32(count);
	for (size_t i = 0; i < count; i++)
		putUInt16((*values)[i]);
}

void MtpDataPacket::putAInt32(const int32_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putInt32(*values++);
}

void MtpDataPacket::putAUInt32(const uint32_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putUInt32(*values++);
}

void MtpDataPacket::putAUInt32(const UInt32List* list) {
	if (!list) {
		putEmptyArray();
	} else {
		size_t size = list->size();
		putUInt32(size);
		for (size_t i = 0; i < size; i++)
			putUInt32((*list)[i]);
	}
}

void MtpDataPacket::putAInt64(const int64_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putInt64(*values++);
}

void MtpDataPacket::putAUInt64(const uint64_t* values, int count) {
	putUInt32(count);
	for (int i = 0; i < count; i++)
		putUInt64(*values++);
}

void MtpDataPacket::putString(const MtpStringBuffer& string) {
	string.writeToPacket(this);
}

void MtpDataPacket::putString(const char* s) {
	MtpStringBuffer string(s);
	string.writeToPacket(this);
}

void MtpDataPacket::putString(const uint16_t* string) {
	int count = 0;
	for (int i = 0; i < 256; i++) {
		if (string[i])
			count++;
		else
			break;
	}
	putUInt8(count > 0 ? count + 1 : 0);
	for (int i = 0; i < count; i++)
		putUInt16(string[i]);
	// only terminate with zero if string is not empty
	if (count > 0)
		putUInt16(0);
}

#ifdef MTP_DEVICE 
int MtpDataPacket::read(int fd) {
	int ret = ::read(fd, mBuffer, MTP_BUFFER_SIZE);
	if (ret < MTP_CONTAINER_HEADER_SIZE)
		return -1;
	mPacketSize = ret;
	mOffset = MTP_CONTAINER_HEADER_SIZE;
	return ret;
}

int MtpDataPacket::write(int fd) {
	MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
	MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
	int ret = ::write(fd, mBuffer, mPacketSize);
	return (ret < 0 ? ret : 0);
}

int MtpDataPacket::writeData(int fd, void* data, uint32_t length) {
	allocate(length);
	memcpy(mBuffer + MTP_CONTAINER_HEADER_SIZE, data, length);
	length += MTP_CONTAINER_HEADER_SIZE;
	MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, length);
	MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
	int ret = ::write(fd, mBuffer, length);
	return (ret < 0 ? ret : 0);
}

#endif // MTP_DEVICE

#ifdef MTP_HOST
int MtpDataPacket::read(struct usb_request *request) {
	// first read the header
	request->buffer = mBuffer;
	request->buffer_length = mBufferSize;
	int32_t length = transfer(request);
	if (length >= MTP_CONTAINER_HEADER_SIZE) {
		// look at the length field to see if the data spans multiple packets
		uint32_t totalLength = MtpPacket::getUInt32(MTP_CONTAINER_LENGTH_OFFSET);
		allocate(totalLength);
		while (totalLength > (uint32_t)length) {
			request->buffer = mBuffer + length;
			request->buffer_length = totalLength - length;
			int ret = transfer(request);
			if (ret >= 0)
				length += ret;
			else {
				length = ret;
				break;
			}
		}
	}
	if (length >= 0)
		mPacketSize = length;
	return length;
}

int MtpDataPacket::readData(struct usb_request *request, void* buffer, int length) {
	int read = 0;
	while (read < length) {
		request->buffer = (char *)buffer + read;
		request->buffer_length = length - read;
		int ret = transfer(request);
		if (ret < 0) {
			return ret;
		}
		read += ret;
	}
	return read;
}

// Queue a read request.  Call readDataWait to wait for result
int MtpDataPacket::readDataAsync(struct usb_request *req) {
	if (usb_request_queue(req)) {
		MTPE("usb_endpoint_queue failed, errno: %d", errno);
		return -1;
	}
	return 0;
}

// Wait for result of readDataAsync
int MtpDataPacket::readDataWait(struct usb_device *device) {
	struct usb_request *req = usb_request_wait(device);
	return (req ? req->actual_length : -1);
}

int MtpDataPacket::readDataHeader(struct usb_request *request) {
	request->buffer = mBuffer;
	request->buffer_length = request->max_packet_size;
	int length = transfer(request);
	if (length >= 0)
		mPacketSize = length;
	return length;
}

int MtpDataPacket::writeDataHeader(struct usb_request *request, uint32_t length) {
	MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, length);
	MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
	request->buffer = mBuffer;
	request->buffer_length = MTP_CONTAINER_HEADER_SIZE;
	int ret = transfer(request);
	return (ret < 0 ? ret : 0);
}
int MtpDataPacket::write(struct usb_request *request) {
	MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
	MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);

	// send header separately from data
	request->buffer = mBuffer;
	request->buffer_length = MTP_CONTAINER_HEADER_SIZE;
	int ret = transfer(request);
	if (ret == MTP_CONTAINER_HEADER_SIZE) {
		request->buffer = mBuffer + MTP_CONTAINER_HEADER_SIZE;
		request->buffer_length = mPacketSize - MTP_CONTAINER_HEADER_SIZE;
		ret = transfer(request);
	}
	return (ret < 0 ? ret : 0);
}

int MtpDataPacket::write(struct usb_request *request, void* buffer, uint32_t length) {
	request->buffer = buffer;
	request->buffer_length = length;
	int ret = transfer(request);
	return (ret < 0 ? ret : 0);
}

#endif // MTP_HOST
void* MtpDataPacket::getData(int& outLength) const {
	int length = mPacketSize - MTP_CONTAINER_HEADER_SIZE;
	if (length > 0) {
		void* result = malloc(length);
		if (result) {
			memcpy(result, mBuffer + MTP_CONTAINER_HEADER_SIZE, length);
			outLength = length;
			return result;
		}
	}
	outLength = 0;
	return NULL;
}