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
25struct usb_device;
26struct usb_request;
27
28namespace android {
29
30class MtpPacket {
31
32protected:
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
41public:
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
67protected:
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