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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _MTP_PACKET_H
     18 #define _MTP_PACKET_H
     19 
     20 #include "MtpTypes.h"
     21 
     22 struct usb_request;
     23 
     24 namespace android {
     25 
     26 class MtpPacket {
     27 
     28 protected:
     29     uint8_t*            mBuffer;
     30     // current size of the buffer
     31     int                 mBufferSize;
     32     // number of bytes to add when resizing the buffer
     33     int                 mAllocationIncrement;
     34     // size of the data in the packet
     35     int                 mPacketSize;
     36 
     37 public:
     38                         MtpPacket(int bufferSize);
     39     virtual             ~MtpPacket();
     40 
     41     // sets packet size to the default container size and sets buffer to zero
     42     virtual void        reset();
     43 
     44     void                allocate(int length);
     45     void                dump();
     46     void                copyFrom(const MtpPacket& src);
     47 
     48     uint16_t            getContainerCode() const;
     49     void                setContainerCode(uint16_t code);
     50 
     51     uint16_t            getContainerType() const;
     52 
     53     MtpTransactionID    getTransactionID() const;
     54     void                setTransactionID(MtpTransactionID id);
     55 
     56     uint32_t            getParameter(int index) const;
     57     void                setParameter(int index, uint32_t value);
     58 
     59 #ifdef MTP_HOST
     60     int                 transfer(struct usb_request* request);
     61 #endif
     62 
     63 protected:
     64     uint16_t            getUInt16(int offset) const;
     65     uint32_t            getUInt32(int offset) const;
     66     void                putUInt16(int offset, uint16_t value);
     67     void                putUInt32(int offset, uint32_t value);
     68 };
     69 
     70 }; // namespace android
     71 
     72 #endif // _MTP_PACKET_H
     73