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