device/usb/usb_ids.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "device/usb/usb_ids.h"
   6
   7 #include <stdlib.h>
   8
   9 #include "base/basictypes.h"
  10
  11 namespace device {
  12
  13 namespace {
  14
  15 static int CompareVendors(const void* a, const void* b) {
  16   const UsbVendor* vendor_a = static_cast<const UsbVendor*>(a);
  17   const UsbVendor* vendor_b = static_cast<const UsbVendor*>(b);
  18   return vendor_a->id - vendor_b->id;
  19 }
  20
  21 static int CompareProducts(const void* a, const void* b) {
  22   const UsbProduct* product_a = static_cast<const UsbProduct*>(a);
  23   const UsbProduct* product_b = static_cast<const UsbProduct*>(b);
  24   return product_a->id - product_b->id;
  25 }
  26
  27 }  // namespace
  28
  29 const UsbVendor* UsbIds::FindVendor(uint16_t vendor_id) {
  30   const UsbVendor key = {vendor_id, NULL, 0, NULL};
  31   void* result = bsearch(&key, vendors_, vendor_size_, sizeof(vendors_[0]),
  32                          &CompareVendors);
  33   if (!result)
  34     return NULL;
  35   return static_cast<const UsbVendor*>(result);
  36 }
  37
  38 const char* UsbIds::GetVendorName(uint16_t vendor_id) {
  39   const UsbVendor* vendor = FindVendor(vendor_id);
  40   if (!vendor)
  41     return NULL;
  42   return vendor->name;
  43 }
  44
  45 const char* UsbIds::GetProductName(uint16_t vendor_id, uint16_t product_id) {
  46   const UsbVendor* vendor = FindVendor(vendor_id);
  47   if (!vendor)
  48     return NULL;
  49
  50   const UsbProduct key = {product_id, NULL};
  51   void* result = bsearch(&key, vendor->products, vendor->product_size,
  52                          sizeof(vendor->products[0]), &CompareProducts);
  53   if (!result)
  54     return NULL;
  55   return static_cast<const UsbProduct*>(result)->name;
  56 }
  57
  58 }  // namespace device