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        mParameterCount(0)
32{
33}
34
35MtpRequestPacket::~MtpRequestPacket() {
36}
37
38#ifdef MTP_DEVICE
39int MtpRequestPacket::read(int fd) {
40    int ret = ::read(fd, mBuffer, mBufferSize);
41    if (ret < 0) {
42        // file read error
43        return ret;
44    }
45
46    // request packet should have 12 byte header followed by 0 to 5 32-bit arguments
47    if (ret >= MTP_CONTAINER_HEADER_SIZE
48            && ret <= MTP_CONTAINER_HEADER_SIZE + 5 * sizeof(uint32_t)
49            && ((ret - MTP_CONTAINER_HEADER_SIZE) & 3) == 0) {
50        mPacketSize = ret;
51        mParameterCount = (ret - MTP_CONTAINER_HEADER_SIZE) / sizeof(uint32_t);
52    } else {
53        ALOGE("Malformed MTP request packet");
54        ret = -1;
55    }
56    return ret;
57}
58#endif
59
60#ifdef MTP_HOST
61    // write our buffer to the given endpoint (host mode)
62int MtpRequestPacket::write(struct usb_request *request)
63{
64    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
65    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
66    request->buffer = mBuffer;
67    request->buffer_length = mPacketSize;
68    return transfer(request);
69}
70#endif
71
72}  // namespace android
73