fdb50e6f8e
MTP does not support partial writes of files (the entire file must be transferred at once). This makes it impossible to implement a FUSE file system for MTP with acceptable performance. To fix this problem, this change adds extended MTP operations to allow partial writes to files: SendPartialObject - allows writing a subset of a file, or appending to the end of a file TruncateObject - allows changing the size of a file BeginEditObject - must be called before using SendPartialObject and TruncateObject EndEditObject - commits changes to a file after it has been edited with SendPartialObject or TruncateObject We also add GetPartialObject64, which is the same as GetPartialObject but has a 64 bit offset rather than 32. Change-Id: I000930b787b00a2da0b57de9790053b2d71b86fd Signed-off-by: Mike Lockwood <lockwood@android.com>
141 lines
4.8 KiB
C++
141 lines
4.8 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _MTP_SERVER_H
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#define _MTP_SERVER_H
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#include "MtpRequestPacket.h"
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#include "MtpDataPacket.h"
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#include "MtpResponsePacket.h"
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#include "MtpEventPacket.h"
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#include "mtp.h"
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#include "MtpUtils.h"
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#include <utils/threads.h>
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namespace android {
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class MtpDatabase;
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class MtpStorage;
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class MtpServer {
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private:
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// file descriptor for MTP kernel driver
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int mFD;
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MtpDatabase* mDatabase;
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// group to own new files and folders
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int mFileGroup;
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// permissions for new files and directories
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int mFilePermission;
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int mDirectoryPermission;
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// current session ID
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MtpSessionID mSessionID;
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// true if we have an open session and mSessionID is valid
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bool mSessionOpen;
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MtpRequestPacket mRequest;
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MtpDataPacket mData;
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MtpResponsePacket mResponse;
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MtpEventPacket mEvent;
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MtpStorageList mStorages;
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// handle for new object, set by SendObjectInfo and used by SendObject
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MtpObjectHandle mSendObjectHandle;
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MtpObjectFormat mSendObjectFormat;
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MtpString mSendObjectFilePath;
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size_t mSendObjectFileSize;
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Mutex mMutex;
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// represents an MTP object that is being edited using the android extensions
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// for direct editing (BeginEditObject, SendPartialObject, TruncateObject and EndEditObject)
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struct ObjectEdit {
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MtpObjectHandle handle;
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MtpString path;
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uint64_t size;
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MtpObjectFormat format;
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int fd;
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};
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Vector<ObjectEdit*> mObjectEditList;
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public:
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MtpServer(int fd, MtpDatabase* database,
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int fileGroup, int filePerm, int directoryPerm);
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virtual ~MtpServer();
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MtpStorage* getStorage(MtpStorageID id);
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inline bool hasStorage() { return mStorages.size() > 0; }
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bool hasStorage(MtpStorageID id);
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void addStorage(MtpStorage* storage);
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void removeStorage(MtpStorage* storage);
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void run();
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void sendObjectAdded(MtpObjectHandle handle);
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void sendObjectRemoved(MtpObjectHandle handle);
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private:
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void sendStoreAdded(MtpStorageID id);
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void sendStoreRemoved(MtpStorageID id);
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void sendEvent(MtpEventCode code, uint32_t param1);
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void addEditObject(MtpObjectHandle handle, MtpString& path,
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uint64_t size, MtpObjectFormat format, int fd);
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ObjectEdit* getEditObject(MtpObjectHandle handle);
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void removeEditObject(MtpObjectHandle handle);
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void commitEdit(ObjectEdit* edit);
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bool handleRequest();
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MtpResponseCode doGetDeviceInfo();
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MtpResponseCode doOpenSession();
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MtpResponseCode doCloseSession();
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MtpResponseCode doGetStorageIDs();
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MtpResponseCode doGetStorageInfo();
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MtpResponseCode doGetObjectPropsSupported();
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MtpResponseCode doGetObjectHandles();
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MtpResponseCode doGetNumObjects();
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MtpResponseCode doGetObjectReferences();
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MtpResponseCode doSetObjectReferences();
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MtpResponseCode doGetObjectPropValue();
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MtpResponseCode doSetObjectPropValue();
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MtpResponseCode doGetDevicePropValue();
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MtpResponseCode doSetDevicePropValue();
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MtpResponseCode doResetDevicePropValue();
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MtpResponseCode doGetObjectPropList();
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MtpResponseCode doGetObjectInfo();
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MtpResponseCode doGetObject();
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MtpResponseCode doGetPartialObject(MtpOperationCode operation);
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MtpResponseCode doSendObjectInfo();
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MtpResponseCode doSendObject();
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MtpResponseCode doDeleteObject();
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MtpResponseCode doGetObjectPropDesc();
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MtpResponseCode doGetDevicePropDesc();
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MtpResponseCode doSendPartialObject();
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MtpResponseCode doTruncateObject();
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MtpResponseCode doBeginEditObject();
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MtpResponseCode doEndEditObject();
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};
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}; // namespace android
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#endif // _MTP_SERVER_H
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