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