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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>
namespace device {
namespace {
// Functor used to filter collections by report ID.
struct CollectionHasReportId {
explicit CollectionHasReportId(const 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 HidDeviceInfo& device_info,
const uint8_t report_id,
HidCollectionInfo* collection_info) {
std::vector<HidCollectionInfo>::const_iterator collection_iter =
std::find_if(device_info.collections.begin(),
device_info.collections.end(),
CollectionHasReportId(report_id));
if (collection_iter != device_info.collections.end()) {
if (collection_info) {
*collection_info = *collection_iter;
}
return true;
}
return false;
}
bool HasProtectedCollection(const HidDeviceInfo& device_info) {
return std::find_if(device_info.collections.begin(),
device_info.collections.end(),
CollectionIsProtected()) != device_info.collections.end();
}
} // namespace
HidConnection::HidConnection(const HidDeviceInfo& device_info)
: device_info_(device_info) {
has_protected_collection_ = HasProtectedCollection(device_info);
}
HidConnection::~HidConnection() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void HidConnection::Read(scoped_refptr<net::IOBufferWithSize> buffer,
const IOCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_.max_input_report_size == 0) {
// The device does not support input reports.
callback.Run(false, 0);
return;
}
int expected_buffer_size = device_info_.max_input_report_size;
if (device_info().has_report_id) {
expected_buffer_size++;
}
if (buffer->size() < expected_buffer_size) {
// Receive buffer is too small.
callback.Run(false, 0);
return;
}
PlatformRead(buffer, callback);
}
void HidConnection::Write(uint8_t report_id,
scoped_refptr<net::IOBufferWithSize> buffer,
const IOCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_.max_output_report_size == 0) {
// The device does not support output reports.
callback.Run(false, 0);
return;
}
if (IsReportIdProtected(report_id)) {
callback.Run(false, 0);
return;
}
PlatformWrite(report_id, buffer, callback);
}
void HidConnection::GetFeatureReport(
uint8_t report_id,
scoped_refptr<net::IOBufferWithSize> buffer,
const IOCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_.max_feature_report_size == 0) {
// The device does not support feature reports.
callback.Run(false, 0);
return;
}
if (IsReportIdProtected(report_id)) {
callback.Run(false, 0);
return;
}
int expected_buffer_size = device_info_.max_feature_report_size;
if (device_info().has_report_id) {
expected_buffer_size++;
}
if (buffer->size() < expected_buffer_size) {
// Receive buffer is too small.
callback.Run(false, 0);
return;
}
PlatformGetFeatureReport(report_id, buffer, callback);
}
void HidConnection::SendFeatureReport(
uint8_t report_id,
scoped_refptr<net::IOBufferWithSize> buffer,
const IOCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (device_info_.max_feature_report_size == 0) {
// The device does not support feature reports.
callback.Run(false, 0);
return;
}
if (IsReportIdProtected(report_id)) {
callback.Run(false, 0);
return;
}
PlatformSendFeatureReport(report_id, buffer, callback);
}
bool HidConnection::CompleteRead(scoped_refptr<net::IOBufferWithSize> buffer,
int bytes_read,
const IOCallback& callback) {
DCHECK_LE(bytes_read, buffer->size());
if (bytes_read == 0 || IsReportIdProtected(buffer->data()[0])) {
return false;
}
callback.Run(true, bytes_read);
return true;
}
bool HidConnection::IsReportIdProtected(const uint8_t report_id) {
HidCollectionInfo collection_info;
if (FindCollectionByReportId(device_info_, 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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