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//
// Copyright 2017 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.
//
#include "h4_packetizer.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <unistd.h>
#include <cerrno>
#include "os/log.h"
#include "osi/include/osi.h"
namespace rootcanal {
H4Packetizer::H4Packetizer(int fd, PacketReadCallback command_cb,
PacketReadCallback event_cb,
PacketReadCallback acl_cb, PacketReadCallback sco_cb,
PacketReadCallback iso_cb,
ClientDisconnectCallback disconnect_cb)
: uart_fd_(fd),
h4_parser_(command_cb, event_cb, acl_cb, sco_cb, iso_cb),
disconnect_cb_(std::move(disconnect_cb)) {}
size_t H4Packetizer::Send(uint8_t type, const uint8_t* data, size_t length) {
struct iovec iov[] = {{&type, sizeof(type)},
{const_cast<uint8_t*>(data), length}};
ssize_t ret = 0;
do {
OSI_NO_INTR(ret = writev(uart_fd_, iov, sizeof(iov) / sizeof(iov[0])));
} while (-1 == ret && EAGAIN == errno);
if (ret == -1) {
LOG_ERROR("Error writing to UART (%s)", strerror(errno));
} else if (ret < static_cast<ssize_t>(length + 1)) {
LOG_ERROR("%d / %d bytes written - something went wrong...",
static_cast<int>(ret), static_cast<int>(length + 1));
}
return ret;
}
void H4Packetizer::OnDataReady(int fd) {
if (disconnected_) return;
ssize_t bytes_to_read = h4_parser_.BytesRequested();
std::vector<uint8_t> buffer(bytes_to_read);
ssize_t bytes_read;
OSI_NO_INTR(bytes_read = read(fd, buffer.data(), bytes_to_read));
if (bytes_read == 0) {
LOG_INFO("remote disconnected!");
disconnected_ = true;
disconnect_cb_();
return;
} else if (bytes_read < 0) {
if (errno == EAGAIN) {
// No data, try again later.
return;
} else if (errno == ECONNRESET) {
// They probably rejected our packet
disconnected_ = true;
disconnect_cb_();
return;
} else {
LOG_ALWAYS_FATAL("Read error in %d: %s", h4_parser_.CurrentState(),
strerror(errno));
}
}
h4_parser_.Consume(buffer.data(), bytes_read);
}
} // namespace rootcanal
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