rlz/win/lib/rlz_value_store_registry.cc - chromium/src - Git at Google

 // 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 "rlz/win/lib/rlz_value_store_registry.h"

 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "rlz/lib/assert.h"
 #include "rlz/lib/lib_values.h"
 #include "rlz/lib/rlz_lib.h"
 #include "rlz/lib/string_utils.h"
 #include "rlz/win/lib/registry_util.h"

 using base::ASCIIToUTF16;

 namespace rlz_lib {

 namespace {

 //
 // Registry keys:
 //
 //   RLZ's are stored as:
 //   <AccessPointName>  = <RLZ value> @ kRootKey\kLibKeyName\kRlzsSubkeyName.
 //
 //   Events are stored as:
 //   <AccessPointName><EventName> = 1 @
 //   HKCU\kLibKeyName\kEventsSubkeyName\GetProductName(product).
 //
 //   The OEM Deal Confirmation Code (DCC) is stored as
 //   kDccValueName = <DCC value> @ HKLM\kLibKeyName
 //
 //   The last ping time, per product is stored as:
 //   GetProductName(product) = <last ping time> @
 //   HKCU\kLibKeyName\kPingTimesSubkeyName.
 //
 // The server does not care about any of these constants.
 //
 const char kLibKeyName[]               = "Software\\Google\\Common\\Rlz";
 const wchar_t kGoogleKeyName[]         = L"Software\\Google";
 const wchar_t kGoogleCommonKeyName[]   = L"Software\\Google\\Common";
 const char kRlzsSubkeyName[]           = "RLZs";
 const char kEventsSubkeyName[]         = "Events";
 const char kStatefulEventsSubkeyName[] = "StatefulEvents";
 const char kPingTimesSubkeyName[]      = "PTimes";

 std::wstring GetWideProductName(Product product) {
   return ASCIIToUTF16(GetProductName(product));
 }

 void AppendBrandToString(std::string* str) {
   std::string brand(SupplementaryBranding::GetBrand());
   if (!brand.empty())
     base::StringAppendF(str, "\\_%s", brand.c_str());
 }

 // Function to get the specific registry keys.
 bool GetRegKey(const char* name, REGSAM access, base::win::RegKey* key) {
   std::string key_location;
   base::StringAppendF(&key_location, "%s\\%s", kLibKeyName, name);
   AppendBrandToString(&key_location);
   base::string16 key_location16 = ASCIIToUTF16(key_location);

   LONG ret;
   if (access & (KEY_SET_VALUE | KEY_CREATE_SUB_KEY | KEY_CREATE_LINK))
     ret = key->Create(HKEY_CURRENT_USER, key_location16.c_str(), access);
   else
     ret = key->Open(HKEY_CURRENT_USER, key_location16.c_str(), access);
   return ret == ERROR_SUCCESS;
 }

 bool GetPingTimesRegKey(REGSAM access, base::win::RegKey* key) {
   return GetRegKey(kPingTimesSubkeyName, access, key);
 }


 bool GetEventsRegKey(const char* event_type,
                      const rlz_lib::Product* product,
                      REGSAM access, base::win::RegKey* key) {
   std::string key_location;
   base::StringAppendF(&key_location, "%s\\%s", kLibKeyName,
                       event_type);
   AppendBrandToString(&key_location);

   if (product != NULL) {
     std::string product_name = GetProductName(*product);
     if (product_name.empty())
       return false;

     base::StringAppendF(&key_location, "\\%s", product_name.c_str());
   }
   base::string16 key_location16 = ASCIIToUTF16(key_location);

   LONG ret;
   if (access & (KEY_SET_VALUE | KEY_CREATE_SUB_KEY | KEY_CREATE_LINK))
     ret = key->Create(HKEY_CURRENT_USER, key_location16.c_str(), access);
   else
     ret = key->Open(HKEY_CURRENT_USER, key_location16.c_str(), access);
   return ret == ERROR_SUCCESS;
 }

 bool GetAccessPointRlzsRegKey(REGSAM access, base::win::RegKey* key) {
   return GetRegKey(kRlzsSubkeyName, access, key);
 }

 bool ClearAllProductEventValues(rlz_lib::Product product, const char* key) {
   std::wstring product_name = GetWideProductName(product);
   if (product_name.empty())
     return false;

   base::win::RegKey reg_key;
   GetEventsRegKey(key, NULL, KEY_WRITE, &reg_key);
   reg_key.DeleteKey(product_name.c_str());

   // Verify that the value no longer exists.
   base::win::RegKey product_events(
       reg_key.Handle(), product_name.c_str(), KEY_READ);
   if (product_events.Valid()) {
     ASSERT_STRING("ClearAllProductEvents: Key deletion failed");
     return false;
   }

   return true;
 }

 // Deletes a registry key if it exists and has no subkeys or values.
 // TODO: Move this to a registry_utils file and add unittest.
 bool DeleteKeyIfEmpty(HKEY root_key, const wchar_t* key_name) {
   if (!key_name) {
     ASSERT_STRING("DeleteKeyIfEmpty: key_name is NULL");
     return false;
   } else {  // Scope needed for RegKey
     base::win::RegKey key(root_key, key_name, KEY_READ);
     if (!key.Valid())
       return true;  // Key does not exist - nothing to do.

     base::win::RegistryKeyIterator key_iter(root_key, key_name);
     if (key_iter.SubkeyCount() > 0)
       return true;  // Not empty, so nothing to do

     base::win::RegistryValueIterator value_iter(root_key, key_name);
     if (value_iter.ValueCount() > 0)
       return true;  // Not empty, so nothing to do
   }

   // The key is empty - delete it now.
   base::win::RegKey key(root_key, L"", KEY_WRITE);
   return key.DeleteKey(key_name) == ERROR_SUCCESS;
 }

 }  // namespace

 // static
 std::wstring RlzValueStoreRegistry::GetWideLibKeyName() {
   return ASCIIToUTF16(kLibKeyName);
 }

 bool RlzValueStoreRegistry::HasAccess(AccessType type) {
   return HasUserKeyAccess(type == kWriteAccess);
 }

 bool RlzValueStoreRegistry::WritePingTime(Product product, int64_t time) {
   base::win::RegKey key;
   std::wstring product_name = GetWideProductName(product);
   return GetPingTimesRegKey(KEY_WRITE, &key) &&
       key.WriteValue(product_name.c_str(), &time, sizeof(time),
                      REG_QWORD) == ERROR_SUCCESS;
 }

 bool RlzValueStoreRegistry::ReadPingTime(Product product, int64_t* time) {
   base::win::RegKey key;
   std::wstring product_name = GetWideProductName(product);
   return GetPingTimesRegKey(KEY_READ, &key) &&
       key.ReadInt64(product_name.c_str(), time) == ERROR_SUCCESS;
 }

 bool RlzValueStoreRegistry::ClearPingTime(Product product) {
   base::win::RegKey key;
   GetPingTimesRegKey(KEY_WRITE, &key);

   std::wstring product_name = GetWideProductName(product);
   key.DeleteValue(product_name.c_str());

   // Verify deletion.
   uint64_t value;
   DWORD size = sizeof(value);
   if (key.ReadValue(
         product_name.c_str(), &value, &size, NULL) == ERROR_SUCCESS) {
     ASSERT_STRING("RlzValueStoreRegistry::ClearPingTime: Failed to delete.");
     return false;
   }

   return true;
 }

 bool RlzValueStoreRegistry::WriteAccessPointRlz(AccessPoint access_point,
                                                 const char* new_rlz) {
   const char* access_point_name = GetAccessPointName(access_point);
   if (!access_point_name)
     return false;

   base::string16 access_point_name16(ASCIIToUTF16(access_point_name));
   base::win::RegKey key;
   GetAccessPointRlzsRegKey(KEY_WRITE, &key);

   if (!RegKeyWriteValue(&key, access_point_name16.c_str(), new_rlz)) {
     ASSERT_STRING("SetAccessPointRlz: Could not write the new RLZ value");
     return false;
   }
   return true;
 }

 bool RlzValueStoreRegistry::ReadAccessPointRlz(AccessPoint access_point,
                                                char* rlz,
                                                size_t rlz_size) {
   const char* access_point_name = GetAccessPointName(access_point);
   if (!access_point_name)
     return false;

   size_t size = rlz_size;
   base::win::RegKey key;
   GetAccessPointRlzsRegKey(KEY_READ, &key);
   base::string16 access_point_name16 = ASCIIToUTF16(access_point_name);
   if (!RegKeyReadValue(key, access_point_name16.c_str(), rlz, &size)) {
     rlz[0] = 0;
     if (size > rlz_size) {
       ASSERT_STRING("GetAccessPointRlz: Insufficient buffer size");
       return false;
     }
   }
   return true;
 }

 bool RlzValueStoreRegistry::ClearAccessPointRlz(AccessPoint access_point) {
   const char* access_point_name = GetAccessPointName(access_point);
   if (!access_point_name)
     return false;

   base::string16 access_point_name16(ASCIIToUTF16(access_point_name));
   base::win::RegKey key;
   GetAccessPointRlzsRegKey(KEY_WRITE, &key);

   key.DeleteValue(access_point_name16.c_str());

   // Verify deletion.
   DWORD value;
   if (key.ReadValueDW(access_point_name16.c_str(), &value) == ERROR_SUCCESS) {
     ASSERT_STRING("SetAccessPointRlz: Could not clear the RLZ value.");
     return false;
   }
   return true;
 }

 bool RlzValueStoreRegistry::UpdateExistingAccessPointRlz(
     const std::string& brand) {
   return false;
 }

 bool RlzValueStoreRegistry::AddProductEvent(Product product,
                                             const char* event_rlz) {
   base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
   base::win::RegKey reg_key;
   GetEventsRegKey(kEventsSubkeyName, &product, KEY_WRITE, &reg_key);
   if (reg_key.WriteValue(event_rlz16.c_str(), 1) != ERROR_SUCCESS) {
     ASSERT_STRING("AddProductEvent: Could not write the new event value");
     return false;
   }

   return true;
 }

 bool RlzValueStoreRegistry::ReadProductEvents(Product product,
                                              std::vector<std::string>* events) {
   // Open the events key.
   base::win::RegKey events_key;
   GetEventsRegKey(kEventsSubkeyName, &product, KEY_READ, &events_key);
   if (!events_key.Valid())
     return false;

   // Append the events to the buffer.
   int num_values = 0;
   LONG result = ERROR_SUCCESS;
   for (num_values = 0; result == ERROR_SUCCESS; ++num_values) {
     // Max 32767 bytes according to MSDN, but we never use that much.
     const size_t kMaxValueNameLength = 2048;
     char buffer[kMaxValueNameLength];
     DWORD size = base::size(buffer);

     result = RegEnumValueA(events_key.Handle(), num_values, buffer, &size,
                            NULL, NULL, NULL, NULL);
     if (result == ERROR_SUCCESS)
       events->push_back(std::string(buffer));
   }

   return result == ERROR_NO_MORE_ITEMS;
 }

 bool RlzValueStoreRegistry::ClearProductEvent(Product product,
                                               const char* event_rlz) {
   base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
   base::win::RegKey key;
   GetEventsRegKey(kEventsSubkeyName, &product, KEY_WRITE, &key);
   key.DeleteValue(event_rlz16.c_str());

   // Verify deletion.
   DWORD value;
   if (key.ReadValueDW(event_rlz16.c_str(), &value) == ERROR_SUCCESS) {
     ASSERT_STRING("ClearProductEvent: Could not delete the event value.");
     return false;
   }

   return true;
 }

 bool RlzValueStoreRegistry::ClearAllProductEvents(Product product) {
   return ClearAllProductEventValues(product, kEventsSubkeyName);
 }

 bool RlzValueStoreRegistry::AddStatefulEvent(Product product,
                                              const char* event_rlz) {
   base::win::RegKey key;
   base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
   if (!GetEventsRegKey(kStatefulEventsSubkeyName, &product, KEY_WRITE, &key) ||
       key.WriteValue(event_rlz16.c_str(), 1) != ERROR_SUCCESS) {
     ASSERT_STRING(
         "AddStatefulEvent: Could not write the new stateful event");
     return false;
   }

   return true;
 }

 bool RlzValueStoreRegistry::IsStatefulEvent(Product product,
                                             const char* event_rlz) {
   DWORD value;
   base::win::RegKey key;
   GetEventsRegKey(kStatefulEventsSubkeyName, &product, KEY_READ, &key);
   base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
   return key.ReadValueDW(event_rlz16.c_str(), &value) == ERROR_SUCCESS;
 }

 bool RlzValueStoreRegistry::ClearAllStatefulEvents(Product product) {
   return ClearAllProductEventValues(product, kStatefulEventsSubkeyName);
 }

 void RlzValueStoreRegistry::CollectGarbage() {
   // Delete each of the known subkeys if empty.
   const char* const subkeys[] = {
     kRlzsSubkeyName,
     kEventsSubkeyName,
     kStatefulEventsSubkeyName,
     kPingTimesSubkeyName
   };

   for (size_t i = 0; i < base::size(subkeys); i++) {
     std::string subkey_name;
     base::StringAppendF(&subkey_name, "%s\\%s", kLibKeyName, subkeys[i]);
     AppendBrandToString(&subkey_name);
     base::string16 subkey_name16 = ASCIIToUTF16(subkey_name);

     VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, subkey_name16.c_str()));
   }

   // Delete the library key and its parents too now if empty.
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, GetWideLibKeyName().c_str()));
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleCommonKeyName));
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleKeyName));
 }

 ScopedRlzValueStoreLock::ScopedRlzValueStoreLock() {
   if (!lock_.failed())
     store_.reset(new RlzValueStoreRegistry);
 }

 ScopedRlzValueStoreLock::~ScopedRlzValueStoreLock() {
 }

 RlzValueStore* ScopedRlzValueStoreLock::GetStore() {
   return store_.get();
 }

 }  // namespace rlz_lib
	// 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 "rlz/win/lib/rlz_value_store_registry.h"

	#include "base/stl_util.h"
	#include "base/strings/stringprintf.h"
	#include "base/strings/utf_string_conversions.h"
	#include "base/win/registry.h"
	#include "rlz/lib/assert.h"
	#include "rlz/lib/lib_values.h"
	#include "rlz/lib/rlz_lib.h"
	#include "rlz/lib/string_utils.h"
	#include "rlz/win/lib/registry_util.h"

	using base::ASCIIToUTF16;

	namespace rlz_lib {

	namespace {

	//
	// Registry keys:
	//
	// RLZ's are stored as:
	// <AccessPointName> = <RLZ value> @ kRootKey\kLibKeyName\kRlzsSubkeyName.
	//
	// Events are stored as:
	// <AccessPointName><EventName> = 1 @
	// HKCU\kLibKeyName\kEventsSubkeyName\GetProductName(product).
	//
	// The OEM Deal Confirmation Code (DCC) is stored as
	// kDccValueName = <DCC value> @ HKLM\kLibKeyName
	//
	// The last ping time, per product is stored as:
	// GetProductName(product) = <last ping time> @
	// HKCU\kLibKeyName\kPingTimesSubkeyName.
	//
	// The server does not care about any of these constants.
	//
	const char kLibKeyName[] = "Software\\Google\\Common\\Rlz";
	const wchar_t kGoogleKeyName[] = L"Software\\Google";
	const wchar_t kGoogleCommonKeyName[] = L"Software\\Google\\Common";
	const char kRlzsSubkeyName[] = "RLZs";
	const char kEventsSubkeyName[] = "Events";
	const char kStatefulEventsSubkeyName[] = "StatefulEvents";
	const char kPingTimesSubkeyName[] = "PTimes";

	std::wstring GetWideProductName(Product product) {
	return ASCIIToUTF16(GetProductName(product));
	}

	void AppendBrandToString(std::string* str) {
	std::string brand(SupplementaryBranding::GetBrand());
	if (!brand.empty())
	base::StringAppendF(str, "\\_%s", brand.c_str());
	}

	// Function to get the specific registry keys.
	bool GetRegKey(const char* name, REGSAM access, base::win::RegKey* key) {
	std::string key_location;
	base::StringAppendF(&key_location, "%s\\%s", kLibKeyName, name);
	AppendBrandToString(&key_location);
	base::string16 key_location16 = ASCIIToUTF16(key_location);

	LONG ret;
	if (access & (KEY_SET_VALUE \| KEY_CREATE_SUB_KEY \| KEY_CREATE_LINK))
	ret = key->Create(HKEY_CURRENT_USER, key_location16.c_str(), access);
	else
	ret = key->Open(HKEY_CURRENT_USER, key_location16.c_str(), access);
	return ret == ERROR_SUCCESS;
	}

	bool GetPingTimesRegKey(REGSAM access, base::win::RegKey* key) {
	return GetRegKey(kPingTimesSubkeyName, access, key);
	}


	bool GetEventsRegKey(const char* event_type,
	const rlz_lib::Product* product,
	REGSAM access, base::win::RegKey* key) {
	std::string key_location;
	base::StringAppendF(&key_location, "%s\\%s", kLibKeyName,
	event_type);
	AppendBrandToString(&key_location);

	if (product != NULL) {
	std::string product_name = GetProductName(*product);
	if (product_name.empty())
	return false;

	base::StringAppendF(&key_location, "\\%s", product_name.c_str());
	}
	base::string16 key_location16 = ASCIIToUTF16(key_location);

	LONG ret;
	if (access & (KEY_SET_VALUE \| KEY_CREATE_SUB_KEY \| KEY_CREATE_LINK))
	ret = key->Create(HKEY_CURRENT_USER, key_location16.c_str(), access);
	else
	ret = key->Open(HKEY_CURRENT_USER, key_location16.c_str(), access);
	return ret == ERROR_SUCCESS;
	}

	bool GetAccessPointRlzsRegKey(REGSAM access, base::win::RegKey* key) {
	return GetRegKey(kRlzsSubkeyName, access, key);
	}

	bool ClearAllProductEventValues(rlz_lib::Product product, const char* key) {
	std::wstring product_name = GetWideProductName(product);
	if (product_name.empty())
	return false;

	base::win::RegKey reg_key;
	GetEventsRegKey(key, NULL, KEY_WRITE, &reg_key);
	reg_key.DeleteKey(product_name.c_str());

	// Verify that the value no longer exists.
	base::win::RegKey product_events(
	reg_key.Handle(), product_name.c_str(), KEY_READ);
	if (product_events.Valid()) {
	ASSERT_STRING("ClearAllProductEvents: Key deletion failed");
	return false;
	}

	return true;
	}

	// Deletes a registry key if it exists and has no subkeys or values.
	// TODO: Move this to a registry_utils file and add unittest.
	bool DeleteKeyIfEmpty(HKEY root_key, const wchar_t* key_name) {
	if (!key_name) {
	ASSERT_STRING("DeleteKeyIfEmpty: key_name is NULL");
	return false;
	} else { // Scope needed for RegKey
	base::win::RegKey key(root_key, key_name, KEY_READ);
	if (!key.Valid())
	return true; // Key does not exist - nothing to do.

	base::win::RegistryKeyIterator key_iter(root_key, key_name);
	if (key_iter.SubkeyCount() > 0)
	return true; // Not empty, so nothing to do

	base::win::RegistryValueIterator value_iter(root_key, key_name);
	if (value_iter.ValueCount() > 0)
	return true; // Not empty, so nothing to do
	}

	// The key is empty - delete it now.
	base::win::RegKey key(root_key, L"", KEY_WRITE);
	return key.DeleteKey(key_name) == ERROR_SUCCESS;
	}

	} // namespace

	// static
	std::wstring RlzValueStoreRegistry::GetWideLibKeyName() {
	return ASCIIToUTF16(kLibKeyName);
	}

	bool RlzValueStoreRegistry::HasAccess(AccessType type) {
	return HasUserKeyAccess(type == kWriteAccess);
	}

	bool RlzValueStoreRegistry::WritePingTime(Product product, int64_t time) {
	base::win::RegKey key;
	std::wstring product_name = GetWideProductName(product);
	return GetPingTimesRegKey(KEY_WRITE, &key) &&
	key.WriteValue(product_name.c_str(), &time, sizeof(time),
	REG_QWORD) == ERROR_SUCCESS;
	}

	bool RlzValueStoreRegistry::ReadPingTime(Product product, int64_t* time) {
	base::win::RegKey key;
	std::wstring product_name = GetWideProductName(product);
	return GetPingTimesRegKey(KEY_READ, &key) &&
	key.ReadInt64(product_name.c_str(), time) == ERROR_SUCCESS;
	}

	bool RlzValueStoreRegistry::ClearPingTime(Product product) {
	base::win::RegKey key;
	GetPingTimesRegKey(KEY_WRITE, &key);

	std::wstring product_name = GetWideProductName(product);
	key.DeleteValue(product_name.c_str());

	// Verify deletion.
	uint64_t value;
	DWORD size = sizeof(value);
	if (key.ReadValue(
	product_name.c_str(), &value, &size, NULL) == ERROR_SUCCESS) {
	ASSERT_STRING("RlzValueStoreRegistry::ClearPingTime: Failed to delete.");
	return false;
	}

	return true;
	}

	bool RlzValueStoreRegistry::WriteAccessPointRlz(AccessPoint access_point,
	const char* new_rlz) {
	const char* access_point_name = GetAccessPointName(access_point);
	if (!access_point_name)
	return false;

	base::string16 access_point_name16(ASCIIToUTF16(access_point_name));
	base::win::RegKey key;
	GetAccessPointRlzsRegKey(KEY_WRITE, &key);

	if (!RegKeyWriteValue(&key, access_point_name16.c_str(), new_rlz)) {
	ASSERT_STRING("SetAccessPointRlz: Could not write the new RLZ value");
	return false;
	}
	return true;
	}

	bool RlzValueStoreRegistry::ReadAccessPointRlz(AccessPoint access_point,
	char* rlz,
	size_t rlz_size) {
	const char* access_point_name = GetAccessPointName(access_point);
	if (!access_point_name)
	return false;

	size_t size = rlz_size;
	base::win::RegKey key;
	GetAccessPointRlzsRegKey(KEY_READ, &key);
	base::string16 access_point_name16 = ASCIIToUTF16(access_point_name);
	if (!RegKeyReadValue(key, access_point_name16.c_str(), rlz, &size)) {
	rlz[0] = 0;
	if (size > rlz_size) {
	ASSERT_STRING("GetAccessPointRlz: Insufficient buffer size");
	return false;
	}
	}
	return true;
	}

	bool RlzValueStoreRegistry::ClearAccessPointRlz(AccessPoint access_point) {
	const char* access_point_name = GetAccessPointName(access_point);
	if (!access_point_name)
	return false;

	base::string16 access_point_name16(ASCIIToUTF16(access_point_name));
	base::win::RegKey key;
	GetAccessPointRlzsRegKey(KEY_WRITE, &key);

	key.DeleteValue(access_point_name16.c_str());

	// Verify deletion.
	DWORD value;
	if (key.ReadValueDW(access_point_name16.c_str(), &value) == ERROR_SUCCESS) {
	ASSERT_STRING("SetAccessPointRlz: Could not clear the RLZ value.");
	return false;
	}
	return true;
	}

	bool RlzValueStoreRegistry::UpdateExistingAccessPointRlz(
	const std::string& brand) {
	return false;
	}

	bool RlzValueStoreRegistry::AddProductEvent(Product product,
	const char* event_rlz) {
	base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
	base::win::RegKey reg_key;
	GetEventsRegKey(kEventsSubkeyName, &product, KEY_WRITE, &reg_key);
	if (reg_key.WriteValue(event_rlz16.c_str(), 1) != ERROR_SUCCESS) {
	ASSERT_STRING("AddProductEvent: Could not write the new event value");
	return false;
	}

	return true;
	}

	bool RlzValueStoreRegistry::ReadProductEvents(Product product,
	std::vector<std::string>* events) {
	// Open the events key.
	base::win::RegKey events_key;
	GetEventsRegKey(kEventsSubkeyName, &product, KEY_READ, &events_key);
	if (!events_key.Valid())
	return false;

	// Append the events to the buffer.
	int num_values = 0;
	LONG result = ERROR_SUCCESS;
	for (num_values = 0; result == ERROR_SUCCESS; ++num_values) {
	// Max 32767 bytes according to MSDN, but we never use that much.
	const size_t kMaxValueNameLength = 2048;
	char buffer[kMaxValueNameLength];
	DWORD size = base::size(buffer);

	result = RegEnumValueA(events_key.Handle(), num_values, buffer, &size,
	NULL, NULL, NULL, NULL);
	if (result == ERROR_SUCCESS)
	events->push_back(std::string(buffer));
	}

	return result == ERROR_NO_MORE_ITEMS;
	}

	bool RlzValueStoreRegistry::ClearProductEvent(Product product,
	const char* event_rlz) {
	base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
	base::win::RegKey key;
	GetEventsRegKey(kEventsSubkeyName, &product, KEY_WRITE, &key);
	key.DeleteValue(event_rlz16.c_str());

	// Verify deletion.
	DWORD value;
	if (key.ReadValueDW(event_rlz16.c_str(), &value) == ERROR_SUCCESS) {
	ASSERT_STRING("ClearProductEvent: Could not delete the event value.");
	return false;
	}

	return true;
	}

	bool RlzValueStoreRegistry::ClearAllProductEvents(Product product) {
	return ClearAllProductEventValues(product, kEventsSubkeyName);
	}

	bool RlzValueStoreRegistry::AddStatefulEvent(Product product,
	const char* event_rlz) {
	base::win::RegKey key;
	base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
	if (!GetEventsRegKey(kStatefulEventsSubkeyName, &product, KEY_WRITE, &key) \|\|
	key.WriteValue(event_rlz16.c_str(), 1) != ERROR_SUCCESS) {
	ASSERT_STRING(
	"AddStatefulEvent: Could not write the new stateful event");
	return false;
	}

	return true;
	}

	bool RlzValueStoreRegistry::IsStatefulEvent(Product product,
	const char* event_rlz) {
	DWORD value;
	base::win::RegKey key;
	GetEventsRegKey(kStatefulEventsSubkeyName, &product, KEY_READ, &key);
	base::string16 event_rlz16(ASCIIToUTF16(event_rlz));
	return key.ReadValueDW(event_rlz16.c_str(), &value) == ERROR_SUCCESS;
	}

	bool RlzValueStoreRegistry::ClearAllStatefulEvents(Product product) {
	return ClearAllProductEventValues(product, kStatefulEventsSubkeyName);
	}

	void RlzValueStoreRegistry::CollectGarbage() {
	// Delete each of the known subkeys if empty.
	const char* const subkeys[] = {
	kRlzsSubkeyName,
	kEventsSubkeyName,
	kStatefulEventsSubkeyName,
	kPingTimesSubkeyName
	};

	for (size_t i = 0; i < base::size(subkeys); i++) {
	std::string subkey_name;
	base::StringAppendF(&subkey_name, "%s\\%s", kLibKeyName, subkeys[i]);
	AppendBrandToString(&subkey_name);
	base::string16 subkey_name16 = ASCIIToUTF16(subkey_name);

	VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, subkey_name16.c_str()));
	}

	// Delete the library key and its parents too now if empty.
	VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, GetWideLibKeyName().c_str()));
	VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleCommonKeyName));
	VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleKeyName));
	}

	ScopedRlzValueStoreLock::ScopedRlzValueStoreLock() {
	if (!lock_.failed())
	store_.reset(new RlzValueStoreRegistry);
	}

	ScopedRlzValueStoreLock::~ScopedRlzValueStoreLock() {
	}

	RlzValueStore* ScopedRlzValueStoreLock::GetStore() {
	return store_.get();
	}

	} // namespace rlz_lib