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