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gecko-dev/xpcom/ds/nsWindowsRegKey.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include <shlwapi.h>
#include <stdlib.h>
#include "nsWindowsRegKey.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "mozilla/Attributes.h"
#include "nsAutoPtr.h"
//-----------------------------------------------------------------------------
// According to MSDN, the following limits apply (in characters excluding room
// for terminating null character):
#define MAX_KEY_NAME_LEN 255
#define MAX_VALUE_NAME_LEN 16383
class nsWindowsRegKey MOZ_FINAL : public nsIWindowsRegKey
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIWINDOWSREGKEY
nsWindowsRegKey()
: mKey(nullptr)
, mWatchEvent(nullptr)
, mWatchRecursive(FALSE)
{
}
private:
~nsWindowsRegKey()
{
Close();
}
HKEY mKey;
HANDLE mWatchEvent;
BOOL mWatchRecursive;
};
NS_IMPL_ISUPPORTS1(nsWindowsRegKey, nsIWindowsRegKey)
NS_IMETHODIMP
nsWindowsRegKey::GetKey(HKEY *key)
{
*key = mKey;
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::SetKey(HKEY key)
{
// We do not close the older key!
StopWatching();
mKey = key;
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::Close()
{
StopWatching();
if (mKey) {
RegCloseKey(mKey);
mKey = nullptr;
}
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::Open(uint32_t rootKey, const nsAString &path, uint32_t mode)
{
Close();
LONG rv = RegOpenKeyExW((HKEY) rootKey, PromiseFlatString(path).get(), 0,
(REGSAM) mode, &mKey);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::Create(uint32_t rootKey, const nsAString &path, uint32_t mode)
{
Close();
DWORD disposition;
LONG rv = RegCreateKeyExW((HKEY) rootKey, PromiseFlatString(path).get(), 0,
nullptr, REG_OPTION_NON_VOLATILE, (REGSAM) mode, nullptr,
&mKey, &disposition);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::OpenChild(const nsAString &path, uint32_t mode,
nsIWindowsRegKey **result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIWindowsRegKey> child = new nsWindowsRegKey();
nsresult rv = child->Open((uintptr_t) mKey, path, mode);
if (NS_FAILED(rv))
return rv;
child.swap(*result);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::CreateChild(const nsAString &path, uint32_t mode,
nsIWindowsRegKey **result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIWindowsRegKey> child = new nsWindowsRegKey();
nsresult rv = child->Create((uintptr_t) mKey, path, mode);
if (NS_FAILED(rv))
return rv;
child.swap(*result);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::GetChildCount(uint32_t *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD numSubKeys;
LONG rv = RegQueryInfoKeyW(mKey, nullptr, nullptr, nullptr, &numSubKeys,
nullptr, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr);
if (rv != ERROR_SUCCESS)
return NS_ERROR_FAILURE;
*result = numSubKeys;
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::GetChildName(uint32_t index, nsAString &result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
FILETIME lastWritten;
wchar_t nameBuf[MAX_KEY_NAME_LEN + 1];
DWORD nameLen = sizeof(nameBuf) / sizeof(nameBuf[0]);
LONG rv = RegEnumKeyExW(mKey, index, nameBuf, &nameLen, nullptr, nullptr,
nullptr, &lastWritten);
if (rv != ERROR_SUCCESS)
return NS_ERROR_NOT_AVAILABLE; // XXX what's the best error code here?
result.Assign(nameBuf, nameLen);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::HasChild(const nsAString &name, bool *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
// Check for the existence of a child key by opening the key with minimal
// rights. Perhaps there is a more efficient way to do this?
HKEY key;
LONG rv = RegOpenKeyExW(mKey, PromiseFlatString(name).get(), 0,
STANDARD_RIGHTS_READ, &key);
if ((*result = (rv == ERROR_SUCCESS && key)))
RegCloseKey(key);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::GetValueCount(uint32_t *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD numValues;
LONG rv = RegQueryInfoKeyW(mKey, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, &numValues, nullptr, nullptr,
nullptr, nullptr);
if (rv != ERROR_SUCCESS)
return NS_ERROR_FAILURE;
*result = numValues;
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::GetValueName(uint32_t index, nsAString &result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
wchar_t nameBuf[MAX_VALUE_NAME_LEN];
DWORD nameLen = sizeof(nameBuf) / sizeof(nameBuf[0]);
LONG rv = RegEnumValueW(mKey, index, nameBuf, &nameLen, nullptr, nullptr,
nullptr, nullptr);
if (rv != ERROR_SUCCESS)
return NS_ERROR_NOT_AVAILABLE; // XXX what's the best error code here?
result.Assign(nameBuf, nameLen);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::HasValue(const nsAString &name, bool *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0, nullptr,
nullptr, nullptr);
*result = (rv == ERROR_SUCCESS);
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::RemoveChild(const nsAString &name)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegDeleteKeyW(mKey, PromiseFlatString(name).get());
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::RemoveValue(const nsAString &name)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegDeleteValueW(mKey, PromiseFlatString(name).get());
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::GetValueType(const nsAString &name, uint32_t *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0,
(LPDWORD) result, nullptr, nullptr);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::ReadStringValue(const nsAString &name, nsAString &result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD type, size;
const nsString &flatName = PromiseFlatString(name);
LONG rv = RegQueryValueExW(mKey, flatName.get(), 0, &type, nullptr, &size);
if (rv != ERROR_SUCCESS)
return NS_ERROR_FAILURE;
// This must be a string type in order to fetch the value as a string.
// We're being a bit forgiving here by allowing types other than REG_SZ.
if (type != REG_SZ && type == REG_EXPAND_SZ && type == REG_MULTI_SZ)
return NS_ERROR_FAILURE;
// The buffer size must be a multiple of 2.
if (size % 2 != 0)
return NS_ERROR_UNEXPECTED;
if (size == 0) {
result.Truncate();
return NS_OK;
}
// |size| may or may not include the terminating null character.
DWORD resultLen = size / 2;
result.SetLength(resultLen);
nsAString::iterator begin;
result.BeginWriting(begin);
if (begin.size_forward() != resultLen)
return NS_ERROR_OUT_OF_MEMORY;
rv = RegQueryValueExW(mKey, flatName.get(), 0, &type, (LPBYTE) begin.get(),
&size);
if (!result.CharAt(resultLen-1)) {
// The string passed to us had a null terminator in the final position.
result.Truncate(resultLen-1);
}
// Expand the environment variables if needed
if (type == REG_EXPAND_SZ) {
const nsString &flatSource = PromiseFlatString(result);
resultLen = ExpandEnvironmentStringsW(flatSource.get(), nullptr, 0);
if (resultLen > 0) {
nsAutoString expandedResult;
// |resultLen| includes the terminating null character
--resultLen;
expandedResult.SetLength(resultLen);
nsAString::iterator begin;
expandedResult.BeginWriting(begin);
if (begin.size_forward() != resultLen)
return NS_ERROR_OUT_OF_MEMORY;
resultLen = ExpandEnvironmentStringsW(flatSource.get(),
begin.get(),
resultLen + 1);
if (resultLen <= 0) {
rv = ERROR_UNKNOWN_FEATURE;
result.Truncate();
} else {
rv = ERROR_SUCCESS;
result = expandedResult;
}
}
}
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::ReadIntValue(const nsAString &name, uint32_t *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD size = sizeof(*result);
LONG rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0, nullptr,
(LPBYTE) result, &size);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::ReadInt64Value(const nsAString &name, uint64_t *result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD size = sizeof(*result);
LONG rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0, nullptr,
(LPBYTE) result, &size);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::ReadBinaryValue(const nsAString &name, nsACString &result)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
DWORD size;
LONG rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0,
nullptr, nullptr, &size);
if (rv != ERROR_SUCCESS)
return NS_ERROR_FAILURE;
result.SetLength(size);
nsACString::iterator begin;
result.BeginWriting(begin);
if (begin.size_forward() != size)
return NS_ERROR_OUT_OF_MEMORY;
rv = RegQueryValueExW(mKey, PromiseFlatString(name).get(), 0, nullptr,
(LPBYTE) begin.get(), &size);
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::WriteStringValue(const nsAString &name, const nsAString &value)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
// Need to indicate complete size of buffer including null terminator.
const nsString &flatValue = PromiseFlatString(value);
LONG rv = RegSetValueExW(mKey, PromiseFlatString(name).get(), 0, REG_SZ,
(const BYTE *) flatValue.get(),
(flatValue.Length() + 1) * sizeof(char16_t));
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::WriteIntValue(const nsAString &name, uint32_t value)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegSetValueExW(mKey, PromiseFlatString(name).get(), 0, REG_DWORD,
(const BYTE *) &value, sizeof(value));
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::WriteInt64Value(const nsAString &name, uint64_t value)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
LONG rv = RegSetValueExW(mKey, PromiseFlatString(name).get(), 0, REG_QWORD,
(const BYTE *) &value, sizeof(value));
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::WriteBinaryValue(const nsAString &name, const nsACString &value)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
const nsCString &flatValue = PromiseFlatCString(value);
LONG rv = RegSetValueExW(mKey, PromiseFlatString(name).get(), 0, REG_BINARY,
(const BYTE *) flatValue.get(), flatValue.Length());
return (rv == ERROR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowsRegKey::StartWatching(bool recurse)
{
if (NS_WARN_IF(!mKey))
return NS_ERROR_NOT_INITIALIZED;
if (mWatchEvent)
return NS_OK;
mWatchEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
if (!mWatchEvent)
return NS_ERROR_OUT_OF_MEMORY;
DWORD filter = REG_NOTIFY_CHANGE_NAME |
REG_NOTIFY_CHANGE_ATTRIBUTES |
REG_NOTIFY_CHANGE_LAST_SET |
REG_NOTIFY_CHANGE_SECURITY;
LONG rv = RegNotifyChangeKeyValue(mKey, recurse, filter, mWatchEvent, TRUE);
if (rv != ERROR_SUCCESS) {
StopWatching();
// On older versions of Windows, this call is not implemented, so simply
// return NS_OK in those cases and pretend that the watching is happening.
return (rv == ERROR_CALL_NOT_IMPLEMENTED) ? NS_OK : NS_ERROR_FAILURE;
}
mWatchRecursive = recurse;
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::StopWatching()
{
if (mWatchEvent) {
CloseHandle(mWatchEvent);
mWatchEvent = nullptr;
}
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::HasChanged(bool *result)
{
if (mWatchEvent && WaitForSingleObject(mWatchEvent, 0) == WAIT_OBJECT_0) {
// An event only gets signaled once, then it's done, so we have to set up
// another event to watch.
StopWatching();
StartWatching(mWatchRecursive);
*result = true;
} else {
*result = false;
}
return NS_OK;
}
NS_IMETHODIMP
nsWindowsRegKey::IsWatching(bool *result)
{
*result = (mWatchEvent != nullptr);
return NS_OK;
}
//-----------------------------------------------------------------------------
nsresult
NS_NewWindowsRegKey(nsIWindowsRegKey **result)
{
nsRefPtr<nsWindowsRegKey> key = new nsWindowsRegKey();
key.forget(result);
return NS_OK;
}
//-----------------------------------------------------------------------------
nsresult
nsWindowsRegKeyConstructor(nsISupports *delegate, const nsIID &iid,
void **result)
{
if (delegate)
return NS_ERROR_NO_AGGREGATION;
nsCOMPtr<nsIWindowsRegKey> key;
nsresult rv = NS_NewWindowsRegKey(getter_AddRefs(key));
if (NS_SUCCEEDED(rv))
rv = key->QueryInterface(iid, result);
return rv;
}
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