MtpRequestPacket.cpp revision 42d0b79a787814d42e4c6f9dfe14f13cc0f6a758 
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#define LOG_TAG "MtpRequestPacket"
18
19#include <stdio.h>
20#include <sys/types.h>
21#include <fcntl.h>
22
23#include "MtpRequestPacket.h"
24
25#include <usbhost/usbhost.h>
26
27namespace android {
28
29MtpRequestPacket::MtpRequestPacket()
30    :   MtpPacket(512)
31{
32}
33
34MtpRequestPacket::~MtpRequestPacket() {
35}
36
37#ifdef MTP_DEVICE
38int MtpRequestPacket::read(int fd) {
39    int ret = ::read(fd, mBuffer, mBufferSize);
40    if (ret >= 0)
41        mPacketSize = ret;
42    else
43        mPacketSize = 0;
44    return ret;
45}
46#endif
47
48#ifdef MTP_HOST
49    // write our buffer to the given endpoint (host mode)
50int MtpRequestPacket::write(struct usb_request *request)
51{
52    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
53    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
54    request->buffer = mBuffer;
55    request->buffer_length = mPacketSize;
56    return transfer(request);
57}
58#endif
59
60}  // namespace android
61