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// Copyright 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/usb/usb_descriptors.h"
#include <algorithm>
namespace device {
namespace {
const uint8_t kStringDescriptorType = 0x03;
}
UsbEndpointDescriptor::UsbEndpointDescriptor()
: address(0),
direction(USB_DIRECTION_INBOUND),
maximum_packet_size(0),
synchronization_type(USB_SYNCHRONIZATION_NONE),
transfer_type(USB_TRANSFER_CONTROL),
usage_type(USB_USAGE_DATA),
polling_interval(0) {
}
UsbEndpointDescriptor::~UsbEndpointDescriptor() {
}
UsbInterfaceDescriptor::UsbInterfaceDescriptor()
: interface_number(0),
alternate_setting(0),
interface_class(0),
interface_subclass(0),
interface_protocol(0) {
}
UsbInterfaceDescriptor::~UsbInterfaceDescriptor() {
}
UsbConfigDescriptor::UsbConfigDescriptor()
: configuration_value(0),
self_powered(false),
remote_wakeup(false),
maximum_power(0) {
}
UsbConfigDescriptor::~UsbConfigDescriptor() {
}
bool ParseUsbStringDescriptor(const std::vector<uint8_t>& descriptor,
base::string16* output) {
if (descriptor.size() < 2 || descriptor[1] != kStringDescriptorType) {
return false;
}
// Let the device return a buffer larger than the actual string but prefer the
// length reported inside the descriptor.
size_t length = descriptor[0];
length = std::min(length, descriptor.size());
if (length < 2) {
return false;
} else if (length == 2) {
// Special case to avoid indexing beyond the end of |descriptor|.
*output = base::string16();
} else {
*output = base::string16(
reinterpret_cast<const base::char16*>(&descriptor[2]), length / 2 - 1);
}
return true;
}
} // namespace device
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