MtpRequestPacket.cpp revision 16864bae0f51c32c456da2c43adf7a057c0c4882 
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#include <stdio.h>
18#include <sys/types.h>
19#include <fcntl.h>
20
21#include "MtpRequestPacket.h"
22
23MtpRequestPacket::MtpRequestPacket()
24    :   MtpPacket(512)
25{
26}
27
28MtpRequestPacket::~MtpRequestPacket() {
29}
30
31#ifdef MTP_DEVICE
32int MtpRequestPacket::read(int fd) {
33    int ret = ::read(fd, mBuffer, mBufferSize);
34    if (ret >= 0)
35        mPacketSize = ret;
36    else
37        mPacketSize = 0;
38    return ret;
39}
40#endif
41
42#ifdef MTP_HOST
43    // write our buffer to the given endpoint (host mode)
44int MtpRequestPacket::write(struct usb_endpoint *ep)
45{
46    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
47    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
48    return transfer(ep, mBuffer, mPacketSize);
49}
50#endif
51