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90ee2b0aa9bdb8397f312cb13a4273326767db42
EqualizerAPO/helpers/RegistryHelper.cpp
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jthedering 90ee2b0aa9 Version 0.9 
Added: Filter type "IIR", which allows to specify a user-defined IIR filter of arbitrary order with custom coefficients.
Improved: For playback devices, the APO is now installed both as GFX (post-mix) and LFX (pre-mix) APO. Normally the filtering happens in GFX, but the command "Stage" allows to select LFX to apply effects based on the number of input channels.
Added: Expression language. The commands "If", "ElseIf", "Else", "EndIf", "Eval" and inline expressions allow to change the filter behaviour based on runtime conditions.
Added: Command "Copy", which copies audio data between channels.
Added: Command "Delay", which delays the audio on the currently selected channels.
Improved: Configuration files are now locked exclusively for writing while reading them.
Improved: There is now a transition (10 ms) from old to new configuration after loading.
Improved: Substantial internal restructuring to improve extensibility and maintainability. Filtering commands now work exactly in the order they were specified.
Fixed: When the microphone input was in stereo but the application requested a mono stream, the audio was heavily distorted.
Fixed: The sine sweep generated by the Benchmark application had floating-point precision issues leading to severe artifacts when certain filters were applied.
2014-08-10 18:35:59 +00:00

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/*
This file is part of EqualizerAPO, a system-wide equalizer.
Copyright (C) 2012 Jonas Thedering
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <fstream>
#include <sstream>
#include <ObjBase.h>
#include <aclapi.h>
#include "StringHelper.h"
#include "RegistryHelper.h"
using namespace std;
DWORD RegistryHelper::windowsVersion = 0;
wstring RegistryHelper::readValue(wstring key, wstring valuename)
{
wstring result;
HKEY keyHandle = openKey(key, KEY_QUERY_VALUE | KEY_WOW64_64KEY);
LSTATUS status;
DWORD type;
DWORD bufSize;
status = RegQueryValueExW(keyHandle, valuename.c_str(), NULL, &type, NULL, &bufSize);
if(status != ERROR_SUCCESS)
{
RegCloseKey(keyHandle);
throw RegistryException(L"Error while reading registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
if(type != REG_SZ)
{
RegCloseKey(keyHandle);
throw RegistryException(L"Registry value " + key + L"\\" + valuename + L" has wrong type");
}
wchar_t* buf = new wchar_t[bufSize / sizeof(wchar_t) + 1];
status = RegQueryValueExW(keyHandle, valuename.c_str(), NULL, NULL, (LPBYTE)buf, &bufSize);
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
{
delete buf;
throw RegistryException(L"Error while reading registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
//Remove zero-termination
if(buf[bufSize / sizeof(wchar_t) - 1] == L'\0')
bufSize -= sizeof(wchar_t);
result = wstring((wchar_t*)buf, (wstring::size_type)bufSize/sizeof(wchar_t));
delete buf;
return result;
}
unsigned long RegistryHelper::readDWORDValue(wstring key, wstring valuename)
{
unsigned long result;
HKEY keyHandle = openKey(key, KEY_QUERY_VALUE | KEY_WOW64_64KEY);
LSTATUS status;
DWORD type;
DWORD bufSize;
status = RegQueryValueExW(keyHandle, valuename.c_str(), NULL, &type, NULL, &bufSize);
if(status != ERROR_SUCCESS)
{
RegCloseKey(keyHandle);
throw RegistryException(L"Error while reading registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
if(type != REG_DWORD)
{
RegCloseKey(keyHandle);
throw RegistryException(L"Registry value " + key + L"\\" + valuename + L" has wrong type");
}
BYTE* buf = new BYTE[bufSize];
status = RegQueryValueExW(keyHandle, valuename.c_str(), NULL, NULL, buf, &bufSize);
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
{
delete buf;
throw RegistryException(L"Error while reading registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
result = ((unsigned long*)buf)[0];
delete buf;
return result;
}
void RegistryHelper::writeValue(wstring key, wstring valuename, wstring value)
{
HKEY keyHandle = openKey(key, KEY_SET_VALUE | KEY_WOW64_64KEY);
LSTATUS status = RegSetValueExW(keyHandle, valuename.c_str(), 0, REG_SZ, (const BYTE*)value.c_str(), (DWORD)((value.size()+1)*sizeof(wchar_t)));
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while writing to registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
void RegistryHelper::writeMultiValue(wstring key, wstring valuename, wstring value)
{
HKEY keyHandle = openKey(key, KEY_SET_VALUE | KEY_WOW64_64KEY);
wchar_t* data = new wchar_t[value.size() + 2];
value._Copy_s(data, (value.size()+2)*sizeof(wchar_t), value.size());
data[value.size()] = L'\0';
data[value.size()+1] = L'\0';
LSTATUS status = RegSetValueExW(keyHandle, valuename.c_str(), 0, REG_MULTI_SZ, (const BYTE*)data, (DWORD)((value.size()+2)*sizeof(wchar_t)));
delete data;
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while writing to registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
void RegistryHelper::deleteValue(wstring key, wstring valuename)
{
HKEY keyHandle = openKey(key, KEY_SET_VALUE | KEY_WOW64_64KEY);
LSTATUS status = RegDeleteValueW(keyHandle, valuename.c_str());
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while deleting registry value " + key + L"\\" + valuename + L": " + StringHelper::getSystemErrorString(status));
}
void RegistryHelper::createKey(wstring key)
{
HKEY rootKey;
wstring subKey = splitKey(key, &rootKey);
HKEY keyHandle;
LSTATUS status = RegCreateKeyExW(rootKey, subKey.c_str(), 0, NULL, 0, KEY_SET_VALUE | KEY_WOW64_64KEY, NULL, &keyHandle, NULL);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while creating registry key " + key + L": " + StringHelper::getSystemErrorString(status));
RegCloseKey(keyHandle);
}
void RegistryHelper::deleteKey(wstring key)
{
HKEY rootKey;
wstring subKey = splitKey(key, &rootKey);
LSTATUS status = RegDeleteKeyExW(rootKey, subKey.c_str(), KEY_WOW64_64KEY, 0);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while deleting registry key " + key + L": " + StringHelper::getSystemErrorString(status));
}
void RegistryHelper::makeWritable(wstring key)
{
HKEY keyHandle = openKey(key, READ_CONTROL | WRITE_DAC | KEY_WOW64_64KEY);
DWORD descriptorSize = 0;
RegGetKeySecurity(keyHandle, DACL_SECURITY_INFORMATION, NULL, &descriptorSize);
PSECURITY_DESCRIPTOR oldSd = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, descriptorSize);
LSTATUS status = RegGetKeySecurity(keyHandle, DACL_SECURITY_INFORMATION, oldSd, &descriptorSize);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while getting security information for registry key " + key + L": " + StringHelper::getSystemErrorString(status));
BOOL aclPresent, aclDefaulted;
PACL oldAcl = NULL;
if(!GetSecurityDescriptorDacl(oldSd, &aclPresent, &oldAcl, &aclDefaulted))
throw RegistryException(L"Error in GetSecurityDescriptorDacl while ensuring writability");
PSID sid = NULL;
SID_IDENTIFIER_AUTHORITY authority = SECURITY_NT_AUTHORITY;
if(!AllocateAndInitializeSid(&authority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0, &sid))
throw RegistryException(L"Error in AllocateAndInitializeSid while ensuring writability");
EXPLICIT_ACCESS ea;
ea.grfAccessPermissions = KEY_ALL_ACCESS;
ea.grfAccessMode = SET_ACCESS;
ea.grfInheritance= SUB_CONTAINERS_AND_OBJECTS_INHERIT;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.TrusteeType = TRUSTEE_IS_GROUP;
ea.Trustee.ptstrName = (LPWSTR)sid;
PACL acl = NULL;
if(ERROR_SUCCESS != SetEntriesInAcl(1, &ea, oldAcl, &acl))
throw RegistryException(L"Error in SetEntriesInAcl while ensuring writability");
PSECURITY_DESCRIPTOR sd = (PSECURITY_DESCRIPTOR)LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
if(NULL == sd)
throw RegistryException(L"Error in LocalAlloc while ensuring writability");
if(!InitializeSecurityDescriptor(sd, SECURITY_DESCRIPTOR_REVISION))
throw RegistryException(L"Error in InitializeSecurityDescriptor while ensuring writability");
if(!SetSecurityDescriptorDacl(sd, TRUE, acl, FALSE))
throw RegistryException(L"Error in SetSecurityDescriptorDacl while ensuring writability");
status = RegSetKeySecurity(keyHandle, DACL_SECURITY_INFORMATION, sd);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while setting security information for registry key " + key + L": " + StringHelper::getSystemErrorString(status));
FreeSid(sid);
LocalFree(acl);
HeapFree(GetProcessHeap(), 0, oldSd);
LocalFree(sd);
}
void RegistryHelper::takeOwnership(wstring key)
{
HANDLE tokenHandle;
if(!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &tokenHandle))
throw RegistryException(L"Error in OpenProcessToken while taking ownership");
LUID luid;
if(!LookupPrivilegeValue(NULL, SE_TAKE_OWNERSHIP_NAME, &luid))
throw RegistryException(L"Error in LookupPrivilegeValue while taking ownership");
TOKEN_PRIVILEGES tp;
tp.PrivilegeCount = 1;
tp.Privileges[0].Luid = luid;
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
if(!AdjustTokenPrivileges(tokenHandle, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), NULL, NULL))
throw RegistryException(L"Error in AdjustTokenPrivileges while taking ownership");
HKEY keyHandle = openKey(key, WRITE_OWNER | KEY_WOW64_64KEY);
PSECURITY_DESCRIPTOR sd = (PSECURITY_DESCRIPTOR)LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
if(NULL == sd)
throw RegistryException(L"Error in SetPrivilege while taking ownership");
if(!InitializeSecurityDescriptor(sd, SECURITY_DESCRIPTOR_REVISION))
throw RegistryException(L"Error in InitializeSecurityDescriptor while taking ownership");
PSID sid = NULL;
SID_IDENTIFIER_AUTHORITY authority = SECURITY_NT_AUTHORITY;
if(!AllocateAndInitializeSid(&authority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0, &sid))
throw RegistryException(L"Error in AllocateAndInitializeSid while taking ownership");
if(!SetSecurityDescriptorOwner(sd, sid, FALSE))
throw RegistryException(L"Error in SetSecurityDescriptorOwner while taking ownership");
LSTATUS status = RegSetKeySecurity(keyHandle, OWNER_SECURITY_INFORMATION, sd);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while setting security information for registry key " + key + L": " + StringHelper::getSystemErrorString(status));
tp.Privileges[0].Attributes = 0;
if(!AdjustTokenPrivileges(tokenHandle, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), NULL, NULL))
throw RegistryException(L"Error in AdjustTokenPrivileges while taking ownership");
FreeSid(sid);
LocalFree(sd);
}
bool RegistryHelper::keyExists(wstring key)
{
bool result;
HKEY rootKey;
wstring subKey = splitKey(key, &rootKey);
HKEY keyHandle;
result = (RegOpenKeyExW(rootKey, subKey.c_str(), 0, KEY_QUERY_VALUE | KEY_WOW64_64KEY, &keyHandle) == ERROR_SUCCESS);
if(result)
RegCloseKey(keyHandle);
return result;
}
bool RegistryHelper::valueExists(wstring key, wstring valuename)
{
HKEY keyHandle = openKey(key, KEY_QUERY_VALUE | KEY_WOW64_64KEY);
DWORD type;
DWORD bufSize;
LSTATUS status = RegQueryValueExW(keyHandle, valuename.c_str(), NULL, &type, NULL, &bufSize);
RegCloseKey(keyHandle);
return status == ERROR_SUCCESS;
}
vector<wstring> RegistryHelper::enumSubKeys(wstring key)
{
vector<wstring> result;
HKEY keyHandle = openKey(key, KEY_ENUMERATE_SUB_KEYS | KEY_WOW64_64KEY);
wchar_t keyName[256];
DWORD keyLength = sizeof(keyName) / sizeof(wchar_t);
int i=0;
int itemCount=0;
LSTATUS status;
while((status = RegEnumKeyExW(keyHandle, i++, keyName, &keyLength, NULL, NULL, NULL, NULL)) == ERROR_SUCCESS)
{
keyLength = sizeof(keyName) / sizeof(wchar_t);
result.push_back(keyName);
}
RegCloseKey(keyHandle);
if(status != ERROR_NO_MORE_ITEMS)
throw RegistryException(L"Error while enumerating sub keys of registry key " + key + L": " + StringHelper::getSystemErrorString(status));
return result;
}
bool RegistryHelper::keyEmpty(wstring key)
{
HKEY keyHandle = openKey(key, KEY_QUERY_VALUE | KEY_WOW64_64KEY);
DWORD keyCount;
DWORD valueCount;
LSTATUS status = RegQueryInfoKeyW(keyHandle, NULL, NULL, NULL, &keyCount, NULL, NULL, &valueCount, NULL, NULL, NULL, NULL);
RegCloseKey(keyHandle);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while reading info for registry key " + key + L": " + StringHelper::getSystemErrorString(status));
return keyCount == 0 && valueCount == 0;
}
void RegistryHelper::saveToFile(wstring key, vector<wstring> valuenames, wstring filepath)
{
wofstream stream(filepath);
if(!stream.good())
throw RegistryException(L"Error while opening file " + filepath + L" for writing");
stream << L"Windows Registry Editor Version 5.00\n" << endl;
stream << L"[HKEY_LOCAL_MACHINE\\" << key << L"]" << endl;
for(vector<wstring>::iterator it = valuenames.begin(); it != valuenames.end(); it++)
{
wstring& valuename = *it;
wstring value = readValue(key, valuename);
stream << L"\"" << valuename << L"\"=\"" << value << L"\"" << endl;
}
stream << endl;
stream.close();
}
wstring RegistryHelper::getGuidString(GUID guid)
{
wchar_t* temp;
if(FAILED(StringFromCLSID(guid, &temp)))
throw RegistryException(L"Could not convert GUID to string");
std::wstring result(temp);
CoTaskMemFree(temp);
return result;
}
bool RegistryHelper::isWindowsVersionAtLeast(unsigned major, unsigned minor)
{
if(windowsVersion == 0)
{
DWORD handle;
DWORD size = GetFileVersionInfoSizeW(L"kernel32.dll", &handle);
if(size != 0)
{
void* data = malloc(size);
if(GetFileVersionInfo(L"kernel32.dll", handle, size, data))
{
VS_FIXEDFILEINFO* info;
UINT len;
if(VerQueryValueW(data, L"\\", (LPVOID*)&info, &len))
windowsVersion = info->dwProductVersionMS;
}
free(data);
}
}
// this will only work for major and minor up to 99
DWORD compareVersion = ((major / 10) << 20) + ((major % 10) << 16) + ((minor / 10) << 4) + (minor % 10);
return windowsVersion >= compareVersion;
}
HKEY RegistryHelper::openKey(const wstring& key, REGSAM samDesired)
{
HKEY rootKey;
wstring subKey = splitKey(key, &rootKey);
HKEY keyHandle;
LSTATUS status = RegOpenKeyExW(rootKey, subKey.c_str(), 0, samDesired, &keyHandle);
if(status != ERROR_SUCCESS)
throw RegistryException(L"Error while opening registry key " + key + L": " + StringHelper::getSystemErrorString(status));
return keyHandle;
}
wstring RegistryHelper::splitKey(const wstring& key, HKEY* rootKey)
{
size_t pos = key.find(L'\\');
if(pos == wstring::npos)
throw RegistryException(L"Key " + key + L" has invalid format");
wstring rootPart = key.substr(0, pos);
wstring pathPart = key.substr(pos+1);
wstring p = StringHelper::toUpperCase(rootPart);
if(p == L"HKEY_CLASSES_ROOT")
*rootKey = HKEY_CLASSES_ROOT;
else if(p == L"HKEY_CURRENT_CONFIG")
*rootKey = HKEY_CURRENT_CONFIG;
else if(p == L"HKEY_CURRENT_USER")
*rootKey = HKEY_CURRENT_USER;
else if(p == L"HKEY_LOCAL_MACHINE")
*rootKey = HKEY_LOCAL_MACHINE;
else if(p == L"HKEY_USERS")
*rootKey = HKEY_USERS;
else
throw RegistryException(L"Unknown root key " + rootPart);
return pathPart;
}
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