Adding USB ID vendor and product lookups.

device/usb/usb_ids.cc

+// 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 "device/usb/usb_ids.h"
+
+#include <stdlib.h>
+
+#include "base/basictypes.h"
+
+namespace device {
+
+namespace {
+
+static int CompareVendors(const void* a, const void* b) {
+  const UsbVendor* vendor_a = static_cast<const UsbVendor*>(a);
+  const UsbVendor* vendor_b = static_cast<const UsbVendor*>(b);
+  return vendor_a->id - vendor_b->id;
+}
+
+static int CompareProducts(const void* a, const void* b) {
+  const UsbProduct* product_a = static_cast<const UsbProduct*>(a);
+  const UsbProduct* product_b = static_cast<const UsbProduct*>(b);
+  return product_a->id - product_b->id;
+}
+
+}  // namespace
+
+const UsbVendor* UsbIds::FindVendor(uint16_t vendor_id) {
+  const UsbVendor key = {vendor_id, NULL, 0, NULL};
+  void* result = bsearch(&key, vendors_, vendor_size_, sizeof(vendors_[0]),
+                         &CompareVendors);
+  if (!result)
+    return NULL;
+  return static_cast<const UsbVendor*>(result);
+}
+
+const char* UsbIds::GetVendorName(uint16_t vendor_id) {
+  const UsbVendor* vendor = FindVendor(vendor_id);
+  if (!vendor)
+    return NULL;
+  return vendor->name;
+}
+
+const char* UsbIds::GetProductName(uint16_t vendor_id, uint16_t product_id) {
+  const UsbVendor* vendor = FindVendor(vendor_id);
+  if (!vendor)
+    return NULL;
+
+  const UsbProduct key = {product_id, NULL};
+  void* result = bsearch(&key, vendor->products, vendor->product_size,
+                         sizeof(vendor->products[0]), &CompareProducts);
+  if (!result)
+    return NULL;
+  return static_cast<const UsbProduct*>(result)->name;
+}
+
+}  // namespace device