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/*
* Copyright (C) 2015 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 "shell_service.h"
#include <string.h>
#include <algorithm>
#include "adb_io.h"
ShellProtocol::ShellProtocol(int fd) : fd_(fd) {
buffer_[0] = kIdInvalid;
}
ShellProtocol::~ShellProtocol() {
}
bool ShellProtocol::Read() {
// Only read a new header if we've finished the last packet.
if (!bytes_left_) {
if (!ReadFdExactly(fd_, buffer_, kHeaderSize)) {
return false;
}
length_t packet_length;
memcpy(&packet_length, &buffer_[1], sizeof(packet_length));
bytes_left_ = packet_length;
data_length_ = 0;
}
size_t read_length = std::min(bytes_left_, data_capacity());
if (read_length && !ReadFdExactly(fd_, data(), read_length)) {
return false;
}
bytes_left_ -= read_length;
data_length_ = read_length;
return true;
}
bool ShellProtocol::Write(Id id, size_t length) {
buffer_[0] = id;
length_t typed_length = length;
memcpy(&buffer_[1], &typed_length, sizeof(typed_length));
return WriteFdExactly(fd_, buffer_, kHeaderSize + length);
}
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