media/mtp/MtpServer.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.
 */

#include <algorithm>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <chrono>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/time.h>

#define LOG_TAG "MtpServer"

#include "MtpDebug.h"
#include "IMtpDatabase.h"
#include "MtpDescriptors.h"
#include "MtpDevHandle.h"
#include "MtpFfsCompatHandle.h"
#include "MtpFfsHandle.h"
#include "MtpObjectInfo.h"
#include "MtpProperty.h"
#include "MtpServer.h"
#include "MtpStorage.h"
#include "MtpStringBuffer.h"
#include "android-base/strings.h"

namespace android {
static const int SN_EVENT_LOG_ID = 0x534e4554;

static const MtpOperationCode kSupportedOperationCodes[] = {
    MTP_OPERATION_GET_DEVICE_INFO,
    MTP_OPERATION_OPEN_SESSION,
    MTP_OPERATION_CLOSE_SESSION,
    MTP_OPERATION_GET_STORAGE_IDS,
    MTP_OPERATION_GET_STORAGE_INFO,
    MTP_OPERATION_GET_NUM_OBJECTS,
    MTP_OPERATION_GET_OBJECT_HANDLES,
    MTP_OPERATION_GET_OBJECT_INFO,
    MTP_OPERATION_GET_OBJECT,
    MTP_OPERATION_GET_THUMB,
    MTP_OPERATION_DELETE_OBJECT,
    MTP_OPERATION_SEND_OBJECT_INFO,
    MTP_OPERATION_SEND_OBJECT,
//    MTP_OPERATION_INITIATE_CAPTURE,
//    MTP_OPERATION_FORMAT_STORE,
    MTP_OPERATION_RESET_DEVICE,
//    MTP_OPERATION_SELF_TEST,
//    MTP_OPERATION_SET_OBJECT_PROTECTION,
//    MTP_OPERATION_POWER_DOWN,
    MTP_OPERATION_GET_DEVICE_PROP_DESC,
    MTP_OPERATION_GET_DEVICE_PROP_VALUE,
    MTP_OPERATION_SET_DEVICE_PROP_VALUE,
    MTP_OPERATION_RESET_DEVICE_PROP_VALUE,
//    MTP_OPERATION_TERMINATE_OPEN_CAPTURE,
    MTP_OPERATION_MOVE_OBJECT,
    MTP_OPERATION_COPY_OBJECT,
    MTP_OPERATION_GET_PARTIAL_OBJECT,
//    MTP_OPERATION_INITIATE_OPEN_CAPTURE,
    MTP_OPERATION_GET_OBJECT_PROPS_SUPPORTED,
    MTP_OPERATION_GET_OBJECT_PROP_DESC,
    MTP_OPERATION_GET_OBJECT_PROP_VALUE,
    MTP_OPERATION_SET_OBJECT_PROP_VALUE,
    MTP_OPERATION_GET_OBJECT_PROP_LIST,
//    MTP_OPERATION_SET_OBJECT_PROP_LIST,
//    MTP_OPERATION_GET_INTERDEPENDENT_PROP_DESC,
//    MTP_OPERATION_SEND_OBJECT_PROP_LIST,
//    MTP_OPERATION_GET_OBJECT_REFERENCES,
//    MTP_OPERATION_SET_OBJECT_REFERENCES,
//    MTP_OPERATION_SKIP,
    // Android extension for direct file IO
    MTP_OPERATION_GET_PARTIAL_OBJECT_64,
    MTP_OPERATION_SEND_PARTIAL_OBJECT,
    MTP_OPERATION_TRUNCATE_OBJECT,
    MTP_OPERATION_BEGIN_EDIT_OBJECT,
    MTP_OPERATION_END_EDIT_OBJECT,
};

static const MtpEventCode kSupportedEventCodes[] = {
    MTP_EVENT_OBJECT_ADDED,
    MTP_EVENT_OBJECT_REMOVED,
    MTP_EVENT_STORE_ADDED,
    MTP_EVENT_STORE_REMOVED,
    MTP_EVENT_DEVICE_PROP_CHANGED,
    MTP_EVENT_OBJECT_INFO_CHANGED,
};

MtpServer::MtpServer(IMtpDatabase* database, int controlFd, bool ptp,
                    const char *deviceInfoManufacturer,
                    const char *deviceInfoModel,
                    const char *deviceInfoDeviceVersion,
                    const char *deviceInfoSerialNumber)
    :   mDatabase(database),
        mPtp(ptp),
        mDeviceInfoManufacturer(deviceInfoManufacturer),
        mDeviceInfoModel(deviceInfoModel),
        mDeviceInfoDeviceVersion(deviceInfoDeviceVersion),
        mDeviceInfoSerialNumber(deviceInfoSerialNumber),
        mSessionID(0),
        mSessionOpen(false),
        mSendObjectHandle(kInvalidObjectHandle),
        mSendObjectFormat(0),
        mSendObjectFileSize(0),
        mSendObjectModifiedTime(0)
{
    bool ffs_ok = access(FFS_MTP_EP0, W_OK) == 0;
    if (ffs_ok) {
        bool aio_compat = android::base::GetBoolProperty("sys.usb.ffs.aio_compat", false);
        mHandle = aio_compat ? new MtpFfsCompatHandle(controlFd) : new MtpFfsHandle(controlFd);
    } else {
        mHandle = new MtpDevHandle();
    }
}

MtpServer::~MtpServer() {
}

void MtpServer::addStorage(MtpStorage* storage) {
    std::lock_guard<std::mutex> lg(mMutex);

    mStorages.push_back(storage);
    sendStoreAdded(storage->getStorageID());
}

void MtpServer::removeStorage(MtpStorage* storage) {
    std::lock_guard<std::mutex> lg(mMutex);
    auto iter = std::find(mStorages.begin(), mStorages.end(), storage);
    if (iter != mStorages.end()) {
        sendStoreRemoved(storage->getStorageID());
        mStorages.erase(iter);
    }
}

MtpStorage* MtpServer::getStorage(MtpStorageID id) {
    if (id == 0)
        return mStorages[0];
    for (MtpStorage *storage : mStorages) {
        if (storage->getStorageID() == id)
            return storage;
    }
    return nullptr;
}

bool MtpServer::hasStorage(MtpStorageID id) {
    if (id == 0 || id == 0xFFFFFFFF)
        return mStorages.size() > 0;
    return (getStorage(id) != nullptr);
}

void MtpServer::run() {
    if (mHandle->start(mPtp)) {
        ALOGE("Failed to start usb driver!");
        mHandle->close();
        return;
    }

    while (1) {
        int ret = mRequest.read(mHandle);
        if (ret < 0) {
            ALOGE("request read returned %d, errno: %d", ret, errno);
            if (errno == ECANCELED) {
                // return to top of loop and wait for next command
                continue;
            }
            break;
        }
        MtpOperationCode operation = mRequest.getOperationCode();
        MtpTransactionID transaction = mRequest.getTransactionID();

        ALOGV("operation: %s", MtpDebug::getOperationCodeName(operation));
        // FIXME need to generalize this
        bool dataIn = (operation == MTP_OPERATION_SEND_OBJECT_INFO
                    || operation == MTP_OPERATION_SET_OBJECT_REFERENCES
                    || operation == MTP_OPERATION_SET_OBJECT_PROP_VALUE
                    || operation == MTP_OPERATION_SET_DEVICE_PROP_VALUE);
        if (dataIn) {
            int ret = mData.read(mHandle);
            if (ret < 0) {
                ALOGE("data read returned %d, errno: %d", ret, errno);
                if (errno == ECANCELED) {
                    // return to top of loop and wait for next command
                    continue;
                }
                break;
            }
            ALOGV("received data:");
        } else {
            mData.reset();
        }

        if (handleRequest()) {
            if (!dataIn && mData.hasData()) {
                mData.setOperationCode(operation);
                mData.setTransactionID(transaction);
                ALOGV("sending data:");
                ret = mData.write(mHandle);
                if (ret < 0) {
                    ALOGE("request write returned %d, errno: %d", ret, errno);
                    if (errno == ECANCELED) {
                        // return to top of loop and wait for next command
                        continue;
                    }
                    break;
                }
            }

            mResponse.setTransactionID(transaction);
            ALOGV("sending response %04X", mResponse.getResponseCode());
            ret = mResponse.write(mHandle);
            const int savedErrno = errno;
            if (ret < 0) {
                ALOGE("request write returned %d, errno: %d", ret, errno);
                if (savedErrno == ECANCELED) {
                    // return to top of loop and wait for next command
                    continue;
                }
                break;
            }
        } else {
            ALOGV("skipping response\n");
        }
    }

    // commit any open edits
    int count = mObjectEditList.size();
    for (int i = 0; i < count; i++) {
        ObjectEdit* edit = mObjectEditList[i];
        commitEdit(edit);
        delete edit;
    }
    mObjectEditList.clear();

    mHandle->close();
}

void MtpServer::sendObjectAdded(MtpObjectHandle handle) {
    ALOGV("sendObjectAdded %d\n", handle);
    sendEvent(MTP_EVENT_OBJECT_ADDED, handle);
}

void MtpServer::sendObjectRemoved(MtpObjectHandle handle) {
    ALOGV("sendObjectRemoved %d\n", handle);
    sendEvent(MTP_EVENT_OBJECT_REMOVED, handle);
}

void MtpServer::sendObjectInfoChanged(MtpObjectHandle handle) {
    ALOGV("sendObjectInfoChanged %d\n", handle);
    sendEvent(MTP_EVENT_OBJECT_INFO_CHANGED, handle);
}

void MtpServer::sendStoreAdded(MtpStorageID id) {
    ALOGV("sendStoreAdded %08X\n", id);
    sendEvent(MTP_EVENT_STORE_ADDED, id);
}

void MtpServer::sendStoreRemoved(MtpStorageID id) {
    ALOGV("sendStoreRemoved %08X\n", id);
    sendEvent(MTP_EVENT_STORE_REMOVED, id);
}

void MtpServer::sendDevicePropertyChanged(MtpDeviceProperty property) {
    ALOGV("sendDevicePropertyChanged %d\n", property);
    sendEvent(MTP_EVENT_DEVICE_PROP_CHANGED, property);
}

void MtpServer::sendEvent(MtpEventCode code, uint32_t param1) {
    if (mSessionOpen) {
        mEvent.setEventCode(code);
        mEvent.setTransactionID(mRequest.getTransactionID());
        mEvent.setParameter(1, param1);
        if (mEvent.write(mHandle))
            ALOGE("Mtp send event failed: %s", strerror(errno));
    }
}

void MtpServer::addEditObject(MtpObjectHandle handle, MtpStringBuffer& path,
        uint64_t size, MtpObjectFormat format, int fd) {
    ObjectEdit*  edit = new ObjectEdit(handle, path, size, format, fd);
    mObjectEditList.push_back(edit);
}

MtpServer::ObjectEdit* MtpServer::getEditObject(MtpObjectHandle handle) {
    int count = mObjectEditList.size();
    for (int i = 0; i < count; i++) {
        ObjectEdit* edit = mObjectEditList[i];
        if (edit->mHandle == handle) return edit;
    }
    return nullptr;
}

void MtpServer::removeEditObject(MtpObjectHandle handle) {
    int count = mObjectEditList.size();
    for (int i = 0; i < count; i++) {
        ObjectEdit* edit = mObjectEditList[i];
        if (edit->mHandle == handle) {
            delete edit;
            mObjectEditList.erase(mObjectEditList.begin() + i);
            return;
        }
    }
    ALOGE("ObjectEdit not found in removeEditObject");
}

void MtpServer::commitEdit(ObjectEdit* edit) {
    mDatabase->rescanFile((const char *)edit->mPath, edit->mHandle, edit->mFormat);
}


bool MtpServer::handleRequest() {
    std::lock_guard<std::mutex> lg(mMutex);

    MtpOperationCode operation = mRequest.getOperationCode();
    MtpResponseCode response;

    mResponse.reset();

    if (mSendObjectHandle != kInvalidObjectHandle && operation != MTP_OPERATION_SEND_OBJECT) {
        mSendObjectHandle = kInvalidObjectHandle;
        mSendObjectFormat = 0;
        mSendObjectModifiedTime = 0;
    }

    int containertype = mRequest.getContainerType();
    if (containertype != MTP_CONTAINER_TYPE_COMMAND) {
        ALOGE("wrong container type %d", containertype);
        return false;
    }

    ALOGV("got command %s (%x)", MtpDebug::getOperationCodeName(operation), operation);

    switch (operation) {
        case MTP_OPERATION_GET_DEVICE_INFO:
            response = doGetDeviceInfo();
            break;
        case MTP_OPERATION_OPEN_SESSION:
            response = doOpenSession();
            break;
        case MTP_OPERATION_RESET_DEVICE:
        case MTP_OPERATION_CLOSE_SESSION:
            response = doCloseSession();
            break;
        case MTP_OPERATION_GET_STORAGE_IDS:
            response = doGetStorageIDs();
            break;
         case MTP_OPERATION_GET_STORAGE_INFO:
            response = doGetStorageInfo();
            break;
        case MTP_OPERATION_GET_OBJECT_PROPS_SUPPORTED:
            response = doGetObjectPropsSupported();
            break;
        case MTP_OPERATION_GET_OBJECT_HANDLES:
            response = doGetObjectHandles();
            break;
        case MTP_OPERATION_GET_NUM_OBJECTS:
            response = doGetNumObjects();
            break;
        case MTP_OPERATION_GET_OBJECT_REFERENCES:
            response = doGetObjectReferences();
            break;
        case MTP_OPERATION_SET_OBJECT_REFERENCES:
            response = doSetObjectReferences();
            break;
        case MTP_OPERATION_GET_OBJECT_PROP_VALUE:
            response = doGetObjectPropValue();
            break;
        case MTP_OPERATION_SET_OBJECT_PROP_VALUE:
            response = doSetObjectPropValue();
            break;
        case MTP_OPERATION_GET_DEVICE_PROP_VALUE:
            response = doGetDevicePropValue();
            break;
        case MTP_OPERATION_SET_DEVICE_PROP_VALUE:
            response = doSetDevicePropValue();
            break;
        case MTP_OPERATION_RESET_DEVICE_PROP_VALUE:
            response = doResetDevicePropValue();
            break;
        case MTP_OPERATION_GET_OBJECT_PROP_LIST:
            response = doGetObjectPropList();
            break;
        case MTP_OPERATION_GET_OBJECT_INFO:
            response = doGetObjectInfo();
            break;
        case MTP_OPERATION_GET_OBJECT:
            response = doGetObject();
            break;
        case MTP_OPERATION_GET_THUMB:
            response = doGetThumb();
            break;
        case MTP_OPERATION_GET_PARTIAL_OBJECT:
        case MTP_OPERATION_GET_PARTIAL_OBJECT_64:
            response = doGetPartialObject(operation);
            break;
        case MTP_OPERATION_SEND_OBJECT_INFO:
            response = doSendObjectInfo();
            break;
        case MTP_OPERATION_SEND_OBJECT:
            response = doSendObject();
            break;
        case MTP_OPERATION_DELETE_OBJECT:
            response = doDeleteObject();
            break;
        case MTP_OPERATION_COPY_OBJECT:
            response = doCopyObject();
            break;
        case MTP_OPERATION_MOVE_OBJECT:
            response = doMoveObject();
            break;
        case MTP_OPERATION_GET_OBJECT_PROP_DESC:
            response = doGetObjectPropDesc();
            break;
        case MTP_OPERATION_GET_DEVICE_PROP_DESC:
            response = doGetDevicePropDesc();
            break;
        case MTP_OPERATION_SEND_PARTIAL_OBJECT:
            response = doSendPartialObject();
            break;
        case MTP_OPERATION_TRUNCATE_OBJECT:
            response = doTruncateObject();
            break;
        case MTP_OPERATION_BEGIN_EDIT_OBJECT:
            response = doBeginEditObject();
            break;
        case MTP_OPERATION_END_EDIT_OBJECT:
            response = doEndEditObject();
            break;
        default:
            ALOGE("got unsupported command %s (%x)",
                    MtpDebug::getOperationCodeName(operation), operation);
            response = MTP_RESPONSE_OPERATION_NOT_SUPPORTED;
            break;
    }

    if (response != MTP_RESPONSE_OK)
      ALOGW("[MTP] got response 0x%X in command %s (%x)", response,
            MtpDebug::getOperationCodeName(operation), operation);
    if (response == MTP_RESPONSE_TRANSACTION_CANCELLED)
        return false;
    mResponse.setResponseCode(response);
    return true;
}

MtpResponseCode MtpServer::doGetDeviceInfo() {
    MtpStringBuffer   string;

    MtpObjectFormatList* playbackFormats = mDatabase->getSupportedPlaybackFormats();
    MtpObjectFormatList* captureFormats = mDatabase->getSupportedCaptureFormats();
    MtpDevicePropertyList* deviceProperties = mDatabase->getSupportedDeviceProperties();

    // fill in device info
    mData.putUInt16(MTP_STANDARD_VERSION);
    if (mPtp) {
        mData.putUInt32(0);
    } else {
        // MTP Vendor Extension ID
        mData.putUInt32(6);
    }
    mData.putUInt16(MTP_STANDARD_VERSION);
    if (mPtp) {
        // no extensions
        string.set("");
    } else {
        // MTP extensions
        string.set("microsoft.com: 1.0; android.com: 1.0;");
    }
    mData.putString(string); // MTP Extensions
    mData.putUInt16(0); //Functional Mode
    mData.putAUInt16(kSupportedOperationCodes,
            sizeof(kSupportedOperationCodes) / sizeof(uint16_t)); // Operations Supported
    mData.putAUInt16(kSupportedEventCodes,
            sizeof(kSupportedEventCodes) / sizeof(uint16_t)); // Events Supported
    mData.putAUInt16(deviceProperties); // Device Properties Supported
    mData.putAUInt16(captureFormats); // Capture Formats
    mData.putAUInt16(playbackFormats);  // Playback Formats

    mData.putString(mDeviceInfoManufacturer); // Manufacturer
    mData.putString(mDeviceInfoModel); // Model
    mData.putString(mDeviceInfoDeviceVersion); // Device Version
    mData.putString(mDeviceInfoSerialNumber); // Serial Number

    delete playbackFormats;
    delete captureFormats;
    delete deviceProperties;

    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doOpenSession() {
    if (mSessionOpen) {
        mResponse.setParameter(1, mSessionID);
        return MTP_RESPONSE_SESSION_ALREADY_OPEN;
    }
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;

    mSessionID = mRequest.getParameter(1);
    mSessionOpen = true;

    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doCloseSession() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    mSessionID = 0;
    mSessionOpen = false;
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetStorageIDs() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;

    int count = mStorages.size();
    mData.putUInt32(count);
    for (int i = 0; i < count; i++)
        mData.putUInt32(mStorages[i]->getStorageID());

    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetStorageInfo() {
    MtpStringBuffer   string;

    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;

    MtpStorageID id = mRequest.getParameter(1);
    MtpStorage* storage = getStorage(id);
    if (!storage)
        return MTP_RESPONSE_INVALID_STORAGE_ID;

    mData.putUInt16(storage->getType());
    mData.putUInt16(storage->getFileSystemType());
    mData.putUInt16(storage->getAccessCapability());
    mData.putUInt64(storage->getMaxCapacity());
    mData.putUInt64(storage->getFreeSpace());
    mData.putUInt32(1024*1024*1024); // Free Space in Objects
    string.set(storage->getDescription());
    mData.putString(string);
    mData.putEmptyString();   // Volume Identifier

    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetObjectPropsSupported() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectFormat format = mRequest.getParameter(1);
    MtpObjectPropertyList* properties = mDatabase->getSupportedObjectProperties(format);
    mData.putAUInt16(properties);
    delete properties;
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetObjectHandles() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (mRequest.getParameterCount() < 3)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpStorageID storageID = mRequest.getParameter(1);      // 0xFFFFFFFF for all storage
    MtpObjectFormat format = mRequest.getParameter(2);      // 0 for all formats
    MtpObjectHandle parent = mRequest.getParameter(3);      // 0xFFFFFFFF for objects with no parent
                                                            // 0x00000000 for all objects

    if (!hasStorage(storageID))
        return MTP_RESPONSE_INVALID_STORAGE_ID;

    MtpObjectHandleList* handles = mDatabase->getObjectList(storageID, format, parent);
    if (handles == NULL)
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    mData.putAUInt32(handles);
    delete handles;
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetNumObjects() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (mRequest.getParameterCount() < 3)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpStorageID storageID = mRequest.getParameter(1);      // 0xFFFFFFFF for all storage
    MtpObjectFormat format = mRequest.getParameter(2);      // 0 for all formats
    MtpObjectHandle parent = mRequest.getParameter(3);      // 0xFFFFFFFF for objects with no parent
                                                            // 0x00000000 for all objects
    if (!hasStorage(storageID))
        return MTP_RESPONSE_INVALID_STORAGE_ID;

    int count = mDatabase->getNumObjects(storageID, format, parent);
    if (count >= 0) {
        mResponse.setParameter(1, count);
        return MTP_RESPONSE_OK;
    } else {
        mResponse.setParameter(1, 0);
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    }
}

MtpResponseCode MtpServer::doGetObjectReferences() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);

    // FIXME - check for invalid object handle
    MtpObjectHandleList* handles = mDatabase->getObjectReferences(handle);
    if (handles) {
        mData.putAUInt32(handles);
        delete handles;
    } else {
        mData.putEmptyArray();
    }
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doSetObjectReferences() {
    if (!mSessionOpen)
        return MTP_RESPONSE_SESSION_NOT_OPEN;
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpStorageID handle = mRequest.getParameter(1);

    MtpObjectHandleList* references = mData.getAUInt32();
    if (!references)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpResponseCode result = mDatabase->setObjectReferences(handle, references);
    delete references;
    return result;
}

MtpResponseCode MtpServer::doGetObjectPropValue() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 2)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    MtpObjectProperty property = mRequest.getParameter(2);
    ALOGV("GetObjectPropValue %d %s (0x%04X)\n", handle,
          MtpDebug::getObjectPropCodeName(property), property);

    return mDatabase->getObjectPropertyValue(handle, property, mData);
}

MtpResponseCode MtpServer::doSetObjectPropValue() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 2)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    MtpObjectProperty property = mRequest.getParameter(2);
    ALOGV("SetObjectPropValue %d %s\n", handle,
            MtpDebug::getObjectPropCodeName(property));

    return mDatabase->setObjectPropertyValue(handle, property, mData);
}

MtpResponseCode MtpServer::doGetDevicePropValue() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpDeviceProperty property = mRequest.getParameter(1);
    ALOGV("GetDevicePropValue %s\n",
            MtpDebug::getDevicePropCodeName(property));

    return mDatabase->getDevicePropertyValue(property, mData);
}

MtpResponseCode MtpServer::doSetDevicePropValue() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpDeviceProperty property = mRequest.getParameter(1);
    ALOGV("SetDevicePropValue %s\n",
            MtpDebug::getDevicePropCodeName(property));

    return mDatabase->setDevicePropertyValue(property, mData);
}

MtpResponseCode MtpServer::doResetDevicePropValue() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpDeviceProperty property = mRequest.getParameter(1);
    ALOGV("ResetDevicePropValue %s\n",
            MtpDebug::getDevicePropCodeName(property));

    return mDatabase->resetDeviceProperty(property);
}

MtpResponseCode MtpServer::doGetObjectPropList() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 5)
        return MTP_RESPONSE_INVALID_PARAMETER;

    MtpObjectHandle handle = mRequest.getParameter(1);
    // use uint32_t so we can support 0xFFFFFFFF
    uint32_t format = mRequest.getParameter(2);
    uint32_t property = mRequest.getParameter(3);
    int groupCode = mRequest.getParameter(4);
    int depth = mRequest.getParameter(5);
   ALOGV("GetObjectPropList %d format: %s property: %s group: %d depth: %d\n",
            handle, MtpDebug::getFormatCodeName(format),
            MtpDebug::getObjectPropCodeName(property), groupCode, depth);

    return mDatabase->getObjectPropertyList(handle, format, property, groupCode, depth, mData);
}

MtpResponseCode MtpServer::doGetObjectInfo() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    MtpObjectInfo info(handle);
    MtpResponseCode result = mDatabase->getObjectInfo(handle, info);
    if (result == MTP_RESPONSE_OK) {
        char    date[20];

        mData.putUInt32(info.mStorageID);
        mData.putUInt16(info.mFormat);
        mData.putUInt16(info.mProtectionStatus);

        // if object is being edited the database size may be out of date
        uint32_t size = info.mCompressedSize;
        ObjectEdit* edit = getEditObject(handle);
        if (edit)
            size = (edit->mSize > 0xFFFFFFFFLL ? 0xFFFFFFFF : (uint32_t)edit->mSize);
        mData.putUInt32(size);

        mData.putUInt16(info.mThumbFormat);
        mData.putUInt32(info.mThumbCompressedSize);
        mData.putUInt32(info.mThumbPixWidth);
        mData.putUInt32(info.mThumbPixHeight);
        mData.putUInt32(info.mImagePixWidth);
        mData.putUInt32(info.mImagePixHeight);
        mData.putUInt32(info.mImagePixDepth);
        mData.putUInt32(info.mParent);
        mData.putUInt16(info.mAssociationType);
        mData.putUInt32(info.mAssociationDesc);
        mData.putUInt32(info.mSequenceNumber);
        mData.putString(info.mName);
        formatDateTime(info.mDateCreated, date, sizeof(date));
        mData.putString(date);   // date created
        formatDateTime(info.mDateModified, date, sizeof(date));
        mData.putString(date);   // date modified
        mData.putEmptyString();   // keywords
    }
    return result;
}

MtpResponseCode MtpServer::doGetObject() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    MtpStringBuffer pathBuf;
    int64_t fileLength;
    MtpObjectFormat format;
    int result = mDatabase->getObjectFilePath(handle, pathBuf, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;

    auto start = std::chrono::steady_clock::now();

    const char* filePath = (const char *)pathBuf;
    mtp_file_range mfr;
    struct stat sstat;
    uint64_t finalsize;
    bool transcode = android::base::GetBoolProperty("sys.fuse.transcode_mtp", false);
    bool filePathAccess = true;
    ALOGD("Mtp transcode = %d", transcode);

    // For performance reasons, only attempt a ContentResolver open when transcode is required.
    // This is fine as long as we don't transcode by default on the device. If we suddenly
    // transcode by default, we'll need to ensure that MTP doesn't transcode by default and we
    // might need to make a binder call to avoid transcoding or come up with a better strategy.
    if (transcode) {
        mfr.fd = mDatabase->openFilePath(filePath, true);
        fstat(mfr.fd, &sstat);
        finalsize = sstat.st_size;
        fileLength = finalsize;
        if (mfr.fd < 0) {
            ALOGW("Mtp open via IMtpDatabase failed for %s. Falling back to the original",
                  filePath);
            filePathAccess = true;
        } else {
            filePathAccess = false;
        }
    }

    if (filePathAccess) {
        mfr.fd = open(filePath, O_RDONLY);
        if (mfr.fd < 0) {
            return MTP_RESPONSE_GENERAL_ERROR;
        }
        fstat(mfr.fd, &sstat);
        finalsize = sstat.st_size;
    }

    mfr.offset = 0;
    mfr.length = fileLength;
    mfr.command = mRequest.getOperationCode();
    mfr.transaction_id = mRequest.getTransactionID();

    // then transfer the file
    int ret = mHandle->sendFile(mfr);
    if (ret < 0) {
        ALOGE("Mtp send file got error %s", strerror(errno));
        if (errno == ECANCELED) {
            result = MTP_RESPONSE_TRANSACTION_CANCELLED;
        } else {
            result = MTP_RESPONSE_GENERAL_ERROR;
        }
    } else {
        result = MTP_RESPONSE_OK;
    }

    auto end = std::chrono::steady_clock::now();
    std::chrono::duration<double> diff = end - start;
    ALOGV("Sent a file over MTP. Time: %f s, Size: %" PRIu64 ", Rate: %f bytes/s",
            diff.count(), finalsize, ((double) finalsize) / diff.count());
    closeObjFd(mfr.fd, filePath);
    return result;
}

MtpResponseCode MtpServer::doGetThumb() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    size_t thumbSize;
    void* thumb = mDatabase->getThumbnail(handle, thumbSize);
    if (thumb) {
        // send data
        mData.setOperationCode(mRequest.getOperationCode());
        mData.setTransactionID(mRequest.getTransactionID());
        mData.writeData(mHandle, thumb, thumbSize);
        free(thumb);
        return MTP_RESPONSE_OK;
    } else {
        return MTP_RESPONSE_GENERAL_ERROR;
    }
}

MtpResponseCode MtpServer::doGetPartialObject(MtpOperationCode operation) {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    MtpObjectHandle handle = mRequest.getParameter(1);
    uint64_t offset;
    uint32_t length;
    offset = mRequest.getParameter(2);
    if (operation == MTP_OPERATION_GET_PARTIAL_OBJECT_64) {
        // MTP_OPERATION_GET_PARTIAL_OBJECT_64 takes 4 arguments
        if (mRequest.getParameterCount() < 4)
            return MTP_RESPONSE_INVALID_PARAMETER;

        // android extension with 64 bit offset
        uint64_t offset2 = mRequest.getParameter(3);
        offset = offset | (offset2 << 32);
        length = mRequest.getParameter(4);
    } else {
        // MTP_OPERATION_GET_PARTIAL_OBJECT takes 3 arguments
        if (mRequest.getParameterCount() < 3)
            return MTP_RESPONSE_INVALID_PARAMETER;

        // standard GetPartialObject
        length = mRequest.getParameter(3);
    }
    MtpStringBuffer pathBuf;
    int64_t fileLength;
    MtpObjectFormat format;
    int result = mDatabase->getObjectFilePath(handle, pathBuf, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;
    if (offset + length > (uint64_t)fileLength)
        length = fileLength - offset;

    const char* filePath = (const char *)pathBuf;
    ALOGV("sending partial %s %" PRIu64 " %" PRIu32, filePath, offset, length);
    mtp_file_range  mfr;
    mfr.fd = open(filePath, O_RDONLY);
    if (mfr.fd < 0) {
        return MTP_RESPONSE_GENERAL_ERROR;
    }
    mfr.offset = offset;
    mfr.length = length;
    mfr.command = mRequest.getOperationCode();
    mfr.transaction_id = mRequest.getTransactionID();
    mResponse.setParameter(1, length);

    // transfer the file
    int ret = mHandle->sendFile(mfr);
    ALOGV("MTP_SEND_FILE_WITH_HEADER returned %d\n", ret);
    result = MTP_RESPONSE_OK;
    if (ret < 0) {
        if (errno == ECANCELED)
            result = MTP_RESPONSE_TRANSACTION_CANCELLED;
        else
            result = MTP_RESPONSE_GENERAL_ERROR;
    }
    closeObjFd(mfr.fd, filePath);
    return result;
}

MtpResponseCode MtpServer::doSendObjectInfo() {
    MtpStringBuffer path;
    uint16_t temp16;
    uint32_t temp32;

    if (mRequest.getParameterCount() < 2)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpStorageID storageID = mRequest.getParameter(1);
    MtpStorage* storage = getStorage(storageID);
    MtpObjectHandle parent = mRequest.getParameter(2);
    if (!storage)
        return MTP_RESPONSE_INVALID_STORAGE_ID;

    // special case the root
    if (parent == MTP_PARENT_ROOT) {
        path.set(storage->getPath());
        parent = 0;
    } else {
        int64_t length;
        MtpObjectFormat format;
        int result = mDatabase->getObjectFilePath(parent, path, length, format);
        if (result != MTP_RESPONSE_OK)
            return result;
        if (format != MTP_FORMAT_ASSOCIATION)
            return MTP_RESPONSE_INVALID_PARENT_OBJECT;
    }

    // read only the fields we need
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // storage ID
    if (!mData.getUInt16(temp16)) return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectFormat format = temp16;
    if (!mData.getUInt16(temp16)) return MTP_RESPONSE_INVALID_PARAMETER;  // protection status
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;
    mSendObjectFileSize = temp32;
    if (!mData.getUInt16(temp16)) return MTP_RESPONSE_INVALID_PARAMETER;  // thumb format
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // thumb compressed size
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // thumb pix width
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // thumb pix height
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // image pix width
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // image pix height
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // image bit depth
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // parent
    if (!mData.getUInt16(temp16)) return MTP_RESPONSE_INVALID_PARAMETER;
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;
    if (!mData.getUInt32(temp32)) return MTP_RESPONSE_INVALID_PARAMETER;  // sequence number
    MtpStringBuffer name, created, modified;
    if (!mData.getString(name)) return MTP_RESPONSE_INVALID_PARAMETER;    // file name
    if (name.isEmpty()) {
        ALOGE("empty name");
        return MTP_RESPONSE_INVALID_PARAMETER;
    }
    if (!mData.getString(created)) return MTP_RESPONSE_INVALID_PARAMETER;      // date created
    if (!mData.getString(modified)) return MTP_RESPONSE_INVALID_PARAMETER;     // date modified
    // keywords follow

    int type = storage->getType();
    if (type == MTP_STORAGE_REMOVABLE_RAM) {
        std::string str = android::base::Trim((const char*)name);
        name.set(str.c_str());
    }
    ALOGV("name: %s format: 0x%04X (%s)\n", (const char*)name, format,
          MtpDebug::getFormatCodeName(format));
    time_t modifiedTime;
    if (!parseDateTime(modified, modifiedTime))
        modifiedTime = 0;

    if ((strcmp(name, ".") == 0) || (strcmp(name, "..") == 0) ||
        (strchr(name, '/') != NULL)) {
        char errMsg[80];

        snprintf(errMsg, sizeof(errMsg), "Invalid name: %s", (const char *) name);
        ALOGE("%s (b/130656917)", errMsg);
        android_errorWriteWithInfoLog(SN_EVENT_LOG_ID, "130656917", -1, errMsg,
                                      strlen(errMsg));

        return MTP_RESPONSE_INVALID_PARAMETER;
    }
    if (path[path.size() - 1] != '/')
        path.append("/");
    path.append(name);

    // check space first
    if (mSendObjectFileSize > storage->getFreeSpace())
        return MTP_RESPONSE_STORAGE_FULL;
    uint64_t maxFileSize = storage->getMaxFileSize();
    // check storage max file size
    if (maxFileSize != 0) {
        // if mSendObjectFileSize is 0xFFFFFFFF, then all we know is the file size
        // is >= 0xFFFFFFFF
        if (mSendObjectFileSize > maxFileSize || mSendObjectFileSize == 0xFFFFFFFF)
            return MTP_RESPONSE_OBJECT_TOO_LARGE;
    }

    ALOGV("path: %s parent: %d storageID: %08X", (const char*)path, parent, storageID);
    MtpObjectHandle handle = mDatabase->beginSendObject((const char*)path, format,
            parent, storageID);
    ALOGD("handle: %d, parent: %d, storageID: %08X", handle, parent, storageID);
    if (handle == kInvalidObjectHandle) {
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    if (format == MTP_FORMAT_ASSOCIATION) {
        int ret = makeFolder((const char *)path);
        if (ret)
            return MTP_RESPONSE_GENERAL_ERROR;

        // SendObject does not get sent for directories, so call endSendObject here instead
        mDatabase->endSendObject(handle, MTP_RESPONSE_OK);
    }
    mSendObjectFilePath = path;
    // save the handle for the SendObject call, which should follow
    mSendObjectHandle = handle;
    mSendObjectFormat = format;
    mSendObjectModifiedTime = modifiedTime;

    mResponse.setParameter(1, storageID);
    mResponse.setParameter(2, parent);
    mResponse.setParameter(3, handle);

    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doMoveObject() {
    if (!hasStorage())
        return MTP_RESPONSE_GENERAL_ERROR;
    if (mRequest.getParameterCount() < 3)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle objectHandle = mRequest.getParameter(1);
    MtpStorageID storageID = mRequest.getParameter(2);
    MtpStorage* storage = getStorage(storageID);
    MtpObjectHandle parent = mRequest.getParameter(3);
    if (!storage)
        return MTP_RESPONSE_INVALID_STORAGE_ID;
    MtpStringBuffer path;
    MtpResponseCode result;

    MtpStringBuffer fromPath;
    int64_t fileLength;
    MtpObjectFormat format;
    MtpObjectInfo info(objectHandle);
    result = mDatabase->getObjectInfo(objectHandle, info);
    if (result != MTP_RESPONSE_OK)
        return result;
    result = mDatabase->getObjectFilePath(objectHandle, fromPath, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;

    // special case the root
    if (parent == 0) {
        path.set(storage->getPath());
    } else {
        int64_t parentLength;
        MtpObjectFormat parentFormat;
        result = mDatabase->getObjectFilePath(parent, path, parentLength, parentFormat);
        if (result != MTP_RESPONSE_OK)
            return result;
        if (parentFormat != MTP_FORMAT_ASSOCIATION)
            return MTP_RESPONSE_INVALID_PARENT_OBJECT;
    }

    if (path[path.size() - 1] != '/')
        path.append("/");
    path.append(info.mName);

    result = mDatabase->beginMoveObject(objectHandle, parent, storageID);
    if (result != MTP_RESPONSE_OK)
        return result;

    if (info.mStorageID == storageID) {
        ALOGV("Moving file from %s to %s", (const char*)fromPath, (const char*)path);
        if (renameTo(fromPath, path)) {
            PLOG(ERROR) << "rename() failed from " << fromPath << " to " << path;
            result = MTP_RESPONSE_GENERAL_ERROR;
        }
    } else {
        ALOGV("Moving across storages from %s to %s", (const char*)fromPath, (const char*)path);
        if (format == MTP_FORMAT_ASSOCIATION) {
            int ret = makeFolder((const char *)path);
            ret += copyRecursive(fromPath, path);
            if (ret) {
                result = MTP_RESPONSE_GENERAL_ERROR;
            } else {
                deletePath(fromPath);
            }
        } else {
            if (copyFile(fromPath, path)) {
                result = MTP_RESPONSE_GENERAL_ERROR;
            } else {
                deletePath(fromPath);
            }
        }
    }

    // If the move failed, undo the database change
    mDatabase->endMoveObject(info.mParent, parent, info.mStorageID, storageID, objectHandle,
            result == MTP_RESPONSE_OK);

    return result;
}

MtpResponseCode MtpServer::doCopyObject() {
    if (!hasStorage())
        return MTP_RESPONSE_GENERAL_ERROR;
    MtpResponseCode result = MTP_RESPONSE_OK;
    if (mRequest.getParameterCount() < 3)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle objectHandle = mRequest.getParameter(1);
    MtpStorageID storageID = mRequest.getParameter(2);
    MtpStorage* storage = getStorage(storageID);
    MtpObjectHandle parent = mRequest.getParameter(3);
    if (!storage)
        return MTP_RESPONSE_INVALID_STORAGE_ID;
    MtpStringBuffer path;

    MtpStringBuffer fromPath;
    int64_t fileLength;
    MtpObjectFormat format;
    MtpObjectInfo info(objectHandle);
    result = mDatabase->getObjectInfo(objectHandle, info);
    if (result != MTP_RESPONSE_OK)
        return result;
    result = mDatabase->getObjectFilePath(objectHandle, fromPath, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;

    // special case the root
    if (parent == 0) {
        path.set(storage->getPath());
    } else {
        int64_t parentLength;
        MtpObjectFormat parentFormat;
        result = mDatabase->getObjectFilePath(parent, path, parentLength, parentFormat);
        if (result != MTP_RESPONSE_OK)
            return result;
        if (parentFormat != MTP_FORMAT_ASSOCIATION)
            return MTP_RESPONSE_INVALID_PARENT_OBJECT;
    }

    // check space first
    if ((uint64_t) fileLength > storage->getFreeSpace())
        return MTP_RESPONSE_STORAGE_FULL;

    if (path[path.size() - 1] != '/')
        path.append("/");
    path.append(info.mName);

    MtpObjectHandle handle = mDatabase->beginCopyObject(objectHandle, parent, storageID);
    if (handle == kInvalidObjectHandle) {
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    ALOGV("Copying file from %s to %s", (const char*)fromPath, (const char*)path);
    if (format == MTP_FORMAT_ASSOCIATION) {
        int ret = makeFolder((const char *)path);
        ret += copyRecursive(fromPath, path);
        if (ret) {
            result = MTP_RESPONSE_GENERAL_ERROR;
        }
    } else {
        if (copyFile(fromPath, path)) {
            result = MTP_RESPONSE_GENERAL_ERROR;
        }
    }

    mDatabase->endCopyObject(handle, result);
    mResponse.setParameter(1, handle);
    return result;
}

MtpResponseCode MtpServer::doSendObject() {
    if (!hasStorage())
        return MTP_RESPONSE_GENERAL_ERROR;
    MtpResponseCode result = MTP_RESPONSE_OK;
    mode_t mask;
    int ret, initialData;
    bool isCanceled = false;
    struct stat sstat = {};

    auto start = std::chrono::steady_clock::now();

    if (mSendObjectHandle == kInvalidObjectHandle) {
        ALOGE("Expected SendObjectInfo before SendObject");
        result = MTP_RESPONSE_NO_VALID_OBJECT_INFO;
        goto done;
    }

    // read the header, and possibly some data
    ret = mData.read(mHandle);
    if (ret < MTP_CONTAINER_HEADER_SIZE) {
        result = MTP_RESPONSE_GENERAL_ERROR;
        goto done;
    }
    initialData = ret - MTP_CONTAINER_HEADER_SIZE;

    if (mSendObjectFormat == MTP_FORMAT_ASSOCIATION) {
        if (initialData != 0)
            ALOGE("Expected folder size to be 0!");
        mSendObjectHandle = kInvalidObjectHandle;
        mSendObjectFormat = 0;
        mSendObjectModifiedTime = 0;
        return result;
    }

    mtp_file_range  mfr;
    mfr.fd = open(mSendObjectFilePath, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
    if (mfr.fd < 0) {
        result = MTP_RESPONSE_GENERAL_ERROR;
        goto done;
    }
    fchown(mfr.fd, getuid(), FILE_GROUP);
    // set permissions
    mask = umask(0);
    fchmod(mfr.fd, FILE_PERM);
    umask(mask);

    if (initialData > 0) {
        ret = write(mfr.fd, mData.getData(), initialData);
    }

    if (ret < 0) {
        ALOGE("failed to write initial data");
        result = MTP_RESPONSE_GENERAL_ERROR;
    } else {
        mfr.offset = initialData;
        if (mSendObjectFileSize == 0xFFFFFFFF) {
            // tell driver to read until it receives a short packet
            mfr.length = 0xFFFFFFFF;
        } else {
            mfr.length = mSendObjectFileSize - initialData;
        }

        mfr.command = 0;
        mfr.transaction_id = 0;

        // transfer the file
        ret = mHandle->receiveFile(mfr, mfr.length == 0 &&
                initialData == MTP_BUFFER_SIZE - MTP_CONTAINER_HEADER_SIZE);
        if ((ret < 0) && (errno == ECANCELED)) {
            isCanceled = true;
        }
    }

    if (mSendObjectModifiedTime) {
        struct timespec newTime[2];
        newTime[0].tv_nsec = UTIME_NOW;
        newTime[1].tv_sec = mSendObjectModifiedTime;
        newTime[1].tv_nsec = 0;
        if (futimens(mfr.fd, newTime) < 0) {
            ALOGW("changing modified time failed, %s", strerror(errno));
        }
    }

    fstat(mfr.fd, &sstat);
    closeObjFd(mfr.fd, mSendObjectFilePath);

    if (ret < 0) {
        ALOGE("Mtp receive file got error %s", strerror(errno));
        unlink(mSendObjectFilePath);
        if (isCanceled)
            result = MTP_RESPONSE_TRANSACTION_CANCELLED;
        else
            result = MTP_RESPONSE_GENERAL_ERROR;
    }

done:
    // reset so we don't attempt to send the data back
    mData.reset();

    mDatabase->endSendObject(mSendObjectHandle, result == MTP_RESPONSE_OK);
    mSendObjectHandle = kInvalidObjectHandle;
    mSendObjectFormat = 0;
    mSendObjectModifiedTime = 0;

    auto end = std::chrono::steady_clock::now();
    std::chrono::duration<double> diff = end - start;
    uint64_t finalsize = sstat.st_size;
    ALOGV("Got a file over MTP. Time: %fs, Size: %" PRIu64 ", Rate: %f bytes/s",
            diff.count(), finalsize, ((double) finalsize) / diff.count());
    return result;
}

MtpResponseCode MtpServer::doDeleteObject() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    MtpObjectFormat format;
    // FIXME - support deleting all objects if handle is 0xFFFFFFFF
    // FIXME - implement deleting objects by format

    MtpStringBuffer filePath;
    int64_t fileLength;
    int result = mDatabase->getObjectFilePath(handle, filePath, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;

    // Don't delete the actual files unless the database deletion is allowed
    result = mDatabase->beginDeleteObject(handle);
    if (result != MTP_RESPONSE_OK)
        return result;

    bool success = deletePath((const char *)filePath);

    mDatabase->endDeleteObject(handle, success);
    return success ? result : MTP_RESPONSE_PARTIAL_DELETION;
}

MtpResponseCode MtpServer::doGetObjectPropDesc() {
    if (mRequest.getParameterCount() < 2)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectProperty propCode = mRequest.getParameter(1);
    MtpObjectFormat format = mRequest.getParameter(2);
    ALOGV("GetObjectPropDesc %s %s\n", MtpDebug::getObjectPropCodeName(propCode),
                                        MtpDebug::getFormatCodeName(format));
    MtpProperty* property = mDatabase->getObjectPropertyDesc(propCode, format);
    if (!property)
        return MTP_RESPONSE_OBJECT_PROP_NOT_SUPPORTED;
    property->write(mData);
    delete property;
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doGetDevicePropDesc() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpDeviceProperty propCode = mRequest.getParameter(1);
    ALOGV("GetDevicePropDesc %s\n", MtpDebug::getDevicePropCodeName(propCode));
    MtpProperty* property = mDatabase->getDevicePropertyDesc(propCode);
    if (!property)
        return MTP_RESPONSE_DEVICE_PROP_NOT_SUPPORTED;
    property->write(mData);
    delete property;
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doSendPartialObject() {
    if (!hasStorage())
        return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
    if (mRequest.getParameterCount() < 4)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    uint64_t offset = mRequest.getParameter(2);
    uint64_t offset2 = mRequest.getParameter(3);
    offset = offset | (offset2 << 32);
    uint32_t length = mRequest.getParameter(4);

    ObjectEdit* edit = getEditObject(handle);
    if (!edit) {
        ALOGE("object not open for edit in doSendPartialObject");
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    // can't start writing past the end of the file
    if (offset > edit->mSize) {
        ALOGD("writing past end of object, offset: %" PRIu64 ", edit->mSize: %" PRIu64,
            offset, edit->mSize);
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    const char* filePath = (const char *)edit->mPath;
    ALOGV("receiving partial %s %" PRIu64 " %" PRIu32, filePath, offset, length);

    // read the header, and possibly some data
    int ret = mData.read(mHandle);
    if (ret < MTP_CONTAINER_HEADER_SIZE)
        return MTP_RESPONSE_GENERAL_ERROR;
    int initialData = ret - MTP_CONTAINER_HEADER_SIZE;

    if (initialData > 0) {
        ret = pwrite(edit->mFD, mData.getData(), initialData, offset);
        offset += initialData;
        length -= initialData;
    }

    bool isCanceled = false;
    if (ret < 0) {
        ALOGE("failed to write initial data");
    } else {
        mtp_file_range  mfr;
        mfr.fd = edit->mFD;
        mfr.offset = offset;
        mfr.length = length;
        mfr.command = 0;
        mfr.transaction_id = 0;

        // transfer the file
        ret = mHandle->receiveFile(mfr, mfr.length == 0 &&
                initialData == MTP_BUFFER_SIZE - MTP_CONTAINER_HEADER_SIZE);
        if ((ret < 0) && (errno == ECANCELED)) {
            isCanceled = true;
        }
    }
    if (ret < 0) {
        mResponse.setParameter(1, 0);
        if (isCanceled)
            return MTP_RESPONSE_TRANSACTION_CANCELLED;
        else
            return MTP_RESPONSE_GENERAL_ERROR;
    }

    // reset so we don't attempt to send this back
    mData.reset();
    mResponse.setParameter(1, length);
    uint64_t end = offset + length;
    if (end > edit->mSize) {
        edit->mSize = end;
    }
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doTruncateObject() {
    if (mRequest.getParameterCount() < 3)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    ObjectEdit* edit = getEditObject(handle);
    if (!edit) {
        ALOGE("object not open for edit in doTruncateObject");
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    uint64_t offset = mRequest.getParameter(2);
    uint64_t offset2 = mRequest.getParameter(3);
    offset |= (offset2 << 32);
    if (ftruncate(edit->mFD, offset) != 0) {
        return MTP_RESPONSE_GENERAL_ERROR;
    } else {
        edit->mSize = offset;
        return MTP_RESPONSE_OK;
    }
}

MtpResponseCode MtpServer::doBeginEditObject() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    if (getEditObject(handle)) {
        ALOGE("object already open for edit in doBeginEditObject");
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    MtpStringBuffer path;
    int64_t fileLength;
    MtpObjectFormat format;
    int result = mDatabase->getObjectFilePath(handle, path, fileLength, format);
    if (result != MTP_RESPONSE_OK)
        return result;

    int fd = open((const char *)path, O_RDWR | O_EXCL);
    if (fd < 0) {
        ALOGE("open failed for %s in doBeginEditObject (%d)", (const char *)path, errno);
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    addEditObject(handle, path, fileLength, format, fd);
    return MTP_RESPONSE_OK;
}

MtpResponseCode MtpServer::doEndEditObject() {
    if (mRequest.getParameterCount() < 1)
        return MTP_RESPONSE_INVALID_PARAMETER;
    MtpObjectHandle handle = mRequest.getParameter(1);
    ObjectEdit* edit = getEditObject(handle);
    if (!edit) {
        ALOGE("object not open for edit in doEndEditObject");
        return MTP_RESPONSE_GENERAL_ERROR;
    }

    commitEdit(edit);
    removeEditObject(handle);
    return MTP_RESPONSE_OK;
}

}  // namespace android