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 27 namespace android { 28 29 MtpRequestPacket::MtpRequestPacket() 30 : MtpPacket(512), 31 mParameterCount(0) 32 { 33 } 34 35 MtpRequestPacket::~MtpRequestPacket() { 36 } 37 38 #ifdef MTP_DEVICE 39 int 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) 62 int 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
