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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 <android-base/macros.h>
21 
22 #include "MtpDebug.h"
23 #include "MtpTypes.h"
24 
25 struct usb_device;
26 struct usb_request;
27 
28 namespace android {
29 
30 class MtpPacket {
31 
32 protected:
33     uint8_t*            mBuffer;
34     // current size of the buffer
35     size_t              mBufferSize;
36     // number of bytes to add when resizing the buffer
37     size_t              mAllocationIncrement;
38     // size of the data in the packet
39     size_t              mPacketSize;
40 
41 public:
42     explicit            MtpPacket(int bufferSize);
43     virtual             ~MtpPacket();
44 
45     // sets packet size to the default container size and sets buffer to zero
46     virtual void        reset();
47 
48     void                allocate(size_t length);
49     void                dump();
50     void                copyFrom(const MtpPacket& src);
51 
52     uint16_t            getContainerCode() const;
53     void                setContainerCode(uint16_t code);
54 
55     uint16_t            getContainerType() const;
56 
57     MtpTransactionID    getTransactionID() const;
58     void                setTransactionID(MtpTransactionID id);
59 
60     uint32_t            getParameter(int index) const;
61     void                setParameter(int index, uint32_t value);
62 
63 #ifdef MTP_HOST
64     int                 transfer(struct usb_request* request);
65 #endif
66 
67 protected:
68     uint16_t            getUInt16(int offset) const;
69     uint32_t            getUInt32(int offset) const;
70     void                putUInt16(int offset, uint16_t value);
71     void                putUInt32(int offset, uint32_t value);
72 
73     DISALLOW_COPY_AND_ASSIGN(MtpPacket);
74 };
75 
76 }; // namespace android
77 
78 #endif // _MTP_PACKET_H
79