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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/serial/serial_connection.h"
#include <string>
#include "base/file_path.h"
#include "base/string_util.h"
namespace extensions {
const char kSerialConnectionNotFoundError[] = "Serial connection not found";
SerialConnection::SerialConnection(const std::string& port,
int bitrate,
const std::string& owner_extension_id,
ApiResourceEventNotifier* event_notifier)
: ApiResource(owner_extension_id, event_notifier),
port_(port),
bitrate_(bitrate),
file_(base::kInvalidPlatformFileValue) {
CHECK(bitrate >= 0);
}
SerialConnection::~SerialConnection() {
Close();
}
bool SerialConnection::Open() {
bool created = false;
// It's the responsibility of the API wrapper around SerialConnection to
// validate the supplied path against the set of valid port names, and
// it is a reasonable assumption that serial port names are ASCII.
CHECK(IsStringASCII(port_));
FilePath file_path(FilePath::FromUTF8Unsafe(port_));
file_ = base::CreatePlatformFile(file_path,
base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ |
base::PLATFORM_FILE_WRITE | base::PLATFORM_FILE_EXCLUSIVE_READ |
base::PLATFORM_FILE_EXCLUSIVE_WRITE |
base::PLATFORM_FILE_TERMINAL_DEVICE, &created, NULL);
if (file_ == base::kInvalidPlatformFileValue) {
return false;
}
return PostOpen();
}
void SerialConnection::Close() {
if (file_ != base::kInvalidPlatformFileValue) {
base::ClosePlatformFile(file_);
file_ = base::kInvalidPlatformFileValue;
}
}
int SerialConnection::Read(scoped_refptr<net::IOBufferWithSize> io_buffer) {
DCHECK(io_buffer->data());
return base::ReadPlatformFileAtCurrentPos(file_,
io_buffer->data(),
io_buffer->size());
}
int SerialConnection::Write(scoped_refptr<net::IOBuffer> io_buffer,
int byte_count) {
DCHECK(io_buffer->data());
DCHECK(byte_count >= 0);
return base::WritePlatformFileAtCurrentPos(file_,
io_buffer->data(), byte_count);
}
void SerialConnection::Flush() {
base::FlushPlatformFile(file_);
}
} // namespace extensions
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