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      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
     59