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 "IMtpHandle.h"
24#include "MtpRequestPacket.h"
25
26#include <usbhost/usbhost.h>
27
28namespace android {
29
30MtpRequestPacket::MtpRequestPacket()
31    :   MtpPacket(512),
32        mParameterCount(0)
33{
34}
35
36MtpRequestPacket::~MtpRequestPacket() {
37}
38
39#ifdef MTP_DEVICE
40int MtpRequestPacket::read(IMtpHandle *h) {
41    int ret = h->read(mBuffer, mBufferSize);
42    if (ret < 0) {
43        // file read error
44        return ret;
45    }
46
47    // request packet should have 12 byte header followed by 0 to 5 32-bit arguments
48    const size_t read_size = static_cast<size_t>(ret);
49    if (read_size >= MTP_CONTAINER_HEADER_SIZE
50            && read_size <= MTP_CONTAINER_HEADER_SIZE + 5 * sizeof(uint32_t)
51            && ((read_size - MTP_CONTAINER_HEADER_SIZE) & 3) == 0) {
52        mPacketSize = read_size;
53        mParameterCount = (read_size - MTP_CONTAINER_HEADER_SIZE) / sizeof(uint32_t);
54    } else {
55        ALOGE("Malformed MTP request packet");
56        ret = -1;
57    }
58    return ret;
59}
60#endif
61
62#ifdef MTP_HOST
63    // write our buffer to the given endpoint (host mode)
64int MtpRequestPacket::write(struct usb_request *request)
65{
66    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
67    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
68    request->buffer = mBuffer;
69    request->buffer_length = mPacketSize;
70    return transfer(request);
71}
72#endif
73
74}  // namespace android
75