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// Copyright (c) 2014 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 "device/hid/hid_connection.h"
#include <algorithm>
#include "components/device_event_log/device_event_log.h"
namespace device {
namespace {
// Functor used to filter collections by report ID.
struct CollectionHasReportId {
explicit CollectionHasReportId(uint8_t report_id) : report_id_(report_id) {}
bool operator()(const HidCollectionInfo& info) const {
if (info.report_ids.size() == 0 ||
report_id_ == HidConnection::kNullReportId)
return false;
if (report_id_ == HidConnection::kAnyReportId)
return true;
return std::find(info.report_ids.begin(),
info.report_ids.end(),
report_id_) != info.report_ids.end();
}
private:
const uint8_t report_id_;
};
// Functor returning true if collection has a protected usage.
struct CollectionIsProtected {
bool operator()(const HidCollectionInfo& info) const {
return info.usage.IsProtected();
}
};
bool FindCollectionByReportId(const std::vector<HidCollectionInfo>& collections,
uint8_t report_id,
HidCollectionInfo* collection_info) {
std::vector<HidCollectionInfo>::const_iterator collection_iter = std::find_if(
collections.begin(), collections.end(), CollectionHasReportId(report_id));
if (collection_iter != collections.end()) {
if (collection_info) {
*collection_info = *collection_iter;
}
return true;
}
return false;
}
bool HasProtectedCollection(const std::vector<HidCollectionInfo>& collections) {
return std::find_if(collections.begin(), collections.end(),
CollectionIsProtected()) != collections.end();
}
} // namespace
HidConnection::HidConnection(scoped_refptr<HidDeviceInfo> device_info)
: device_info_(device_info), closed_(false) {
has_protected_collection_ =
HasProtectedCollection(device_info->collections());
}
HidConnection::~HidConnection() {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(closed_);
}
void HidConnection::Close() {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!closed_);
PlatformClose();
closed_ = true;
}
void HidConnection::Read(const ReadCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_->max_input_report_size() == 0) {
HID_LOG(USER) << "This device does not support input reports.";
callback.Run(false, NULL, 0);
return;
}
PlatformRead(callback);
}
void HidConnection::Write(scoped_refptr<net::IOBuffer> buffer,
size_t size,
const WriteCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_->max_output_report_size() == 0) {
HID_LOG(USER) << "This device does not support output reports.";
callback.Run(false);
return;
}
if (size > device_info_->max_output_report_size() + 1) {
HID_LOG(USER) << "Output report buffer too long (" << size << " > "
<< (device_info_->max_output_report_size() + 1) << ").";
callback.Run(false);
return;
}
DCHECK_GE(size, 1u);
uint8_t report_id = buffer->data()[0];
if (device_info_->has_report_id() != (report_id != 0)) {
HID_LOG(USER) << "Invalid output report ID.";
callback.Run(false);
return;
}
if (IsReportIdProtected(report_id)) {
HID_LOG(USER) << "Attempt to set a protected output report.";
callback.Run(false);
return;
}
PlatformWrite(buffer, size, callback);
}
void HidConnection::GetFeatureReport(uint8_t report_id,
const ReadCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_->max_feature_report_size() == 0) {
HID_LOG(USER) << "This device does not support feature reports.";
callback.Run(false, NULL, 0);
return;
}
if (device_info_->has_report_id() != (report_id != 0)) {
HID_LOG(USER) << "Invalid feature report ID.";
callback.Run(false, NULL, 0);
return;
}
if (IsReportIdProtected(report_id)) {
HID_LOG(USER) << "Attempt to get a protected feature report.";
callback.Run(false, NULL, 0);
return;
}
PlatformGetFeatureReport(report_id, callback);
}
void HidConnection::SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
size_t size,
const WriteCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_->max_feature_report_size() == 0) {
HID_LOG(USER) << "This device does not support feature reports.";
callback.Run(false);
return;
}
DCHECK_GE(size, 1u);
uint8_t report_id = buffer->data()[0];
if (device_info_->has_report_id() != (report_id != 0)) {
HID_LOG(USER) << "Invalid feature report ID.";
callback.Run(false);
return;
}
if (IsReportIdProtected(report_id)) {
HID_LOG(USER) << "Attempt to set a protected feature report.";
callback.Run(false);
return;
}
PlatformSendFeatureReport(buffer, size, callback);
}
bool HidConnection::CompleteRead(scoped_refptr<net::IOBuffer> buffer,
size_t size,
const ReadCallback& callback) {
DCHECK_GE(size, 1u);
uint8_t report_id = buffer->data()[0];
if (IsReportIdProtected(report_id)) {
HID_LOG(EVENT) << "Filtered a protected input report.";
return false;
}
callback.Run(true, buffer, size);
return true;
}
bool HidConnection::IsReportIdProtected(uint8_t report_id) {
HidCollectionInfo collection_info;
if (FindCollectionByReportId(device_info_->collections(), report_id,
&collection_info)) {
return collection_info.usage.IsProtected();
}
return has_protected_collection();
}
PendingHidReport::PendingHidReport() {}
PendingHidReport::~PendingHidReport() {}
PendingHidRead::PendingHidRead() {}
PendingHidRead::~PendingHidRead() {}
} // namespace device
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