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75 lines
2.1 KiB
75 lines
2.1 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MtpRequestPacket"
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "IMtpHandle.h"
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#include "MtpRequestPacket.h"
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#include <usbhost/usbhost.h>
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namespace android {
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MtpRequestPacket::MtpRequestPacket()
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: MtpPacket(512),
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mParameterCount(0)
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{
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}
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MtpRequestPacket::~MtpRequestPacket() {
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}
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#ifdef MTP_DEVICE
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int MtpRequestPacket::read(IMtpHandle *h) {
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int ret = h->read(mBuffer, mBufferSize);
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if (ret < 0) {
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// file read error
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return ret;
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}
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// request packet should have 12 byte header followed by 0 to 5 32-bit arguments
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const size_t read_size = static_cast<size_t>(ret);
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if (read_size >= MTP_CONTAINER_HEADER_SIZE
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&& read_size <= MTP_CONTAINER_HEADER_SIZE + 5 * sizeof(uint32_t)
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&& ((read_size - MTP_CONTAINER_HEADER_SIZE) & 3) == 0) {
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mPacketSize = read_size;
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mParameterCount = (read_size - MTP_CONTAINER_HEADER_SIZE) / sizeof(uint32_t);
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} else {
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ALOGE("Malformed MTP request packet");
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ret = -1;
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}
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return ret;
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}
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#endif
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#ifdef MTP_HOST
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// write our buffer to the given endpoint (host mode)
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int MtpRequestPacket::write(struct usb_request *request)
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{
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putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
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putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
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request->buffer = mBuffer;
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request->buffer_length = mPacketSize;
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return transfer(request);
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}
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#endif
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} // namespace android
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