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 28 namespace android { 29 MtpRequestPacket()30MtpRequestPacket::MtpRequestPacket() 31 : MtpPacket(512), 32 mParameterCount(0) 33 { 34 } 35 ~MtpRequestPacket()36MtpRequestPacket::~MtpRequestPacket() { 37 } 38 39 #ifdef MTP_DEVICE read(IMtpHandle * h)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) write(struct usb_request * request)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