1 files changed, 387 insertions, 0 deletions
diff --git a/base/win/registry.cc b/base/win/registry.cc
new file mode 100644
index 0000000..545c337
--- /dev/null
+++ b/base/win/registry.cc
@@ -0,0 +1,387 @@
+// Copyright (c) 2010 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 "base/win/registry.h"
+
+#include <shlwapi.h>
+
+#include "base/logging.h"
+
+#pragma comment(lib, "shlwapi.lib")  // for SHDeleteKey
+
+namespace base {
+namespace win {
+
+RegistryValueIterator::RegistryValueIterator(HKEY root_key,
+                                             const wchar_t* folder_key) {
+  LONG result = RegOpenKeyEx(root_key, folder_key, 0, KEY_READ, &key_);
+  if (result != ERROR_SUCCESS) {
+    key_ = NULL;
+  } else {
+    DWORD count = 0;
+    result = ::RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL, NULL, &count,
+                               NULL, NULL, NULL, NULL);
+
+    if (result != ERROR_SUCCESS) {
+      ::RegCloseKey(key_);
+      key_ = NULL;
+    } else {
+      index_ = count - 1;
+    }
+  }
+
+  Read();
+}
+
+RegistryValueIterator::~RegistryValueIterator() {
+  if (key_)
+    ::RegCloseKey(key_);
+}
+
+bool RegistryValueIterator::Valid() const {
+  return key_ != NULL && index_ >= 0;
+}
+
+void RegistryValueIterator::operator++() {
+  --index_;
+  Read();
+}
+
+bool RegistryValueIterator::Read() {
+  if (Valid()) {
+    DWORD ncount = arraysize(name_);
+    value_size_ = sizeof(value_);
+    LRESULT r = ::RegEnumValue(key_, index_, name_, &ncount, NULL, &type_,
+                               reinterpret_cast<BYTE*>(value_), &value_size_);
+    if (ERROR_SUCCESS == r)
+      return true;
+  }
+
+  name_[0] = '\0';
+  value_[0] = '\0';
+  value_size_ = 0;
+  return false;
+}
+
+DWORD RegistryValueIterator::ValueCount() const {
+  DWORD count = 0;
+  HRESULT result = ::RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL, NULL,
+                                     &count, NULL, NULL, NULL, NULL);
+
+  if (result != ERROR_SUCCESS)
+    return 0;
+
+  return count;
+}
+
+RegistryKeyIterator::RegistryKeyIterator(HKEY root_key,
+                                         const wchar_t* folder_key) {
+  LONG result = RegOpenKeyEx(root_key, folder_key, 0, KEY_READ, &key_);
+  if (result != ERROR_SUCCESS) {
+    key_ = NULL;
+  } else {
+    DWORD count = 0;
+    HRESULT result = ::RegQueryInfoKey(key_, NULL, 0, NULL, &count, NULL, NULL,
+                                       NULL, NULL, NULL, NULL, NULL);
+
+    if (result != ERROR_SUCCESS) {
+      ::RegCloseKey(key_);
+      key_ = NULL;
+    } else {
+      index_ = count - 1;
+    }
+  }
+
+  Read();
+}
+
+RegistryKeyIterator::~RegistryKeyIterator() {
+  if (key_)
+    ::RegCloseKey(key_);
+}
+
+bool RegistryKeyIterator::Valid() const {
+  return key_ != NULL && index_ >= 0;
+}
+
+void RegistryKeyIterator::operator++() {
+  --index_;
+  Read();
+}
+
+bool RegistryKeyIterator::Read() {
+  if (Valid()) {
+    DWORD ncount = arraysize(name_);
+    FILETIME written;
+    LRESULT r = ::RegEnumKeyEx(key_, index_, name_, &ncount, NULL, NULL,
+                               NULL, &written);
+    if (ERROR_SUCCESS == r)
+      return true;
+  }
+
+  name_[0] = '\0';
+  return false;
+}
+
+DWORD RegistryKeyIterator::SubkeyCount() const {
+  DWORD count = 0;
+  HRESULT result = ::RegQueryInfoKey(key_, NULL, 0, NULL, &count, NULL, NULL,
+                                     NULL, NULL, NULL, NULL, NULL);
+
+  if (result != ERROR_SUCCESS)
+    return 0;
+
+  return count;
+}
+
+RegKey::RegKey()
+    : key_(NULL),
+      watch_event_(0) {
+}
+
+RegKey::RegKey(HKEY rootkey, const wchar_t* subkey, REGSAM access)
+    : key_(NULL),
+      watch_event_(0) {
+  if (rootkey) {
+    if (access & (KEY_SET_VALUE | KEY_CREATE_SUB_KEY | KEY_CREATE_LINK))
+      Create(rootkey, subkey, access);
+    else
+      Open(rootkey, subkey, access);
+  } else {
+    DCHECK(!subkey);
+  }
+}
+
+RegKey::~RegKey() {
+  Close();
+}
+
+void RegKey::Close() {
+  StopWatching();
+  if (key_) {
+    ::RegCloseKey(key_);
+    key_ = NULL;
+  }
+}
+
+bool RegKey::Create(HKEY rootkey, const wchar_t* subkey, REGSAM access) {
+  DWORD disposition_value;
+  return CreateWithDisposition(rootkey, subkey, &disposition_value, access);
+}
+
+bool RegKey::CreateWithDisposition(HKEY rootkey, const wchar_t* subkey,
+                                   DWORD* disposition, REGSAM access) {
+  DCHECK(rootkey && subkey && access && disposition);
+  Close();
+
+  LONG result = RegCreateKeyEx(rootkey,
+                               subkey,
+                               0,
+                               NULL,
+                               REG_OPTION_NON_VOLATILE,
+                               access,
+                               NULL,
+                               &key_,
+                               disposition);
+  if (result != ERROR_SUCCESS) {
+    key_ = NULL;
+    return false;
+  }
+
+  return true;
+}
+
+bool RegKey::Open(HKEY rootkey, const wchar_t* subkey, REGSAM access) {
+  DCHECK(rootkey && subkey && access);
+  Close();
+
+  LONG result = RegOpenKeyEx(rootkey, subkey, 0, access, &key_);
+  if (result != ERROR_SUCCESS) {
+    key_ = NULL;
+    return false;
+  }
+  return true;
+}
+
+bool RegKey::CreateKey(const wchar_t* name, REGSAM access) {
+  DCHECK(name && access);
+
+  HKEY subkey = NULL;
+  LONG result = RegCreateKeyEx(key_, name, 0, NULL, REG_OPTION_NON_VOLATILE,
+                               access, NULL, &subkey, NULL);
+  Close();
+
+  key_ = subkey;
+  return (result == ERROR_SUCCESS);
+}
+
+bool RegKey::OpenKey(const wchar_t* name, REGSAM access) {
+  DCHECK(name && access);
+
+  HKEY subkey = NULL;
+  LONG result = RegOpenKeyEx(key_, name, 0, access, &subkey);
+
+  Close();
+
+  key_ = subkey;
+  return (result == ERROR_SUCCESS);
+}
+
+DWORD RegKey::ValueCount() {
+  DWORD count = 0;
+  HRESULT result = RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL,
+                                   NULL, &count, NULL, NULL, NULL, NULL);
+  return (result != ERROR_SUCCESS) ? 0 : count;
+}
+
+bool RegKey::ReadName(int index, std::wstring* name) {
+  wchar_t buf[256];
+  DWORD bufsize = arraysize(buf);
+  LRESULT r = ::RegEnumValue(key_, index, buf, &bufsize, NULL, NULL,
+                             NULL, NULL);
+  if (r != ERROR_SUCCESS)
+    return false;
+  if (name)
+    *name = buf;
+  return true;
+}
+
+bool RegKey::ValueExists(const wchar_t* name) {
+  if (!key_)
+    return false;
+  HRESULT result = RegQueryValueEx(key_, name, 0, NULL, NULL, NULL);
+  return (result == ERROR_SUCCESS);
+}
+
+bool RegKey::ReadValue(const wchar_t* name, void* data,
+                       DWORD* dsize, DWORD* dtype) {
+  if (!key_)
+    return false;
+  HRESULT result = RegQueryValueEx(key_, name, 0, dtype,
+                                   reinterpret_cast<LPBYTE>(data), dsize);
+  return (result == ERROR_SUCCESS);
+}
+
+bool RegKey::ReadValue(const wchar_t* name, std::wstring* value) {
+  DCHECK(value);
+  const size_t kMaxStringLength = 1024;  // This is after expansion.
+  // Use the one of the other forms of ReadValue if 1024 is too small for you.
+  wchar_t raw_value[kMaxStringLength];
+  DWORD type = REG_SZ, size = sizeof(raw_value);
+  if (ReadValue(name, raw_value, &size, &type)) {
+    if (type == REG_SZ) {
+      *value = raw_value;
+    } else if (type == REG_EXPAND_SZ) {
+      wchar_t expanded[kMaxStringLength];
+      size = ExpandEnvironmentStrings(raw_value, expanded, kMaxStringLength);
+      // Success: returns the number of wchar_t's copied
+      // Fail: buffer too small, returns the size required
+      // Fail: other, returns 0
+      if (size == 0 || size > kMaxStringLength)
+        return false;
+      *value = expanded;
+    } else {
+      // Not a string. Oops.
+      return false;
+    }
+    return true;
+  }
+
+  return false;
+}
+
+bool RegKey::ReadValueDW(const wchar_t* name, DWORD* value) {
+  DCHECK(value);
+  DWORD type = REG_DWORD;
+  DWORD size = sizeof(DWORD);
+  DWORD result = 0;
+  if (ReadValue(name, &result, &size, &type) &&
+      (type == REG_DWORD || type == REG_BINARY) &&
+      size == sizeof(DWORD)) {
+    *value = result;
+    return true;
+  }
+
+  return false;
+}
+
+bool RegKey::WriteValue(const wchar_t* name, const void * data,
+                        DWORD dsize, DWORD dtype) {
+  DCHECK(data);
+
+  if (!key_)
+    return false;
+
+  HRESULT result = RegSetValueEx(
+      key_,
+      name,
+      0,
+      dtype,
+      reinterpret_cast<LPBYTE>(const_cast<void*>(data)),
+      dsize);
+  return (result == ERROR_SUCCESS);
+}
+
+bool RegKey::WriteValue(const wchar_t * name, const wchar_t* value) {
+  return WriteValue(name, value,
+      static_cast<DWORD>(sizeof(*value) * (wcslen(value) + 1)), REG_SZ);
+}
+
+bool RegKey::WriteValue(const wchar_t* name, DWORD value) {
+  return WriteValue(name, &value,
+      static_cast<DWORD>(sizeof(value)), REG_DWORD);
+}
+
+bool RegKey::DeleteKey(const wchar_t* name) {
+  return (!key_) ? false : (ERROR_SUCCESS == SHDeleteKey(key_, name));
+}
+
+bool RegKey::DeleteValue(const wchar_t* value_name) {
+  DCHECK(value_name);
+  HRESULT result = RegDeleteValue(key_, value_name);
+  return (result == ERROR_SUCCESS);
+}
+
+bool RegKey::StartWatching() {
+  if (!watch_event_)
+    watch_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
+
+  DWORD filter = REG_NOTIFY_CHANGE_NAME |
+                 REG_NOTIFY_CHANGE_ATTRIBUTES |
+                 REG_NOTIFY_CHANGE_LAST_SET |
+                 REG_NOTIFY_CHANGE_SECURITY;
+
+  // Watch the registry key for a change of value.
+  HRESULT result = RegNotifyChangeKeyValue(key_, TRUE, filter,
+                                           watch_event_, TRUE);
+  if (SUCCEEDED(result)) {
+    return true;
+  } else {
+    CloseHandle(watch_event_);
+    watch_event_ = 0;
+    return false;
+  }
+}
+
+bool RegKey::StopWatching() {
+  if (watch_event_) {
+    CloseHandle(watch_event_);
+    watch_event_ = 0;
+    return true;
+  }
+  return false;
+}
+
+bool RegKey::HasChanged() {
+  if (watch_event_) {
+    if (WaitForSingleObject(watch_event_, 0) == WAIT_OBJECT_0) {
+      StartWatching();
+      return true;
+    }
+  }
+  return false;
+}
+
+}  // namespace win
+}  // namespace base