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Support reading longer registry value by dynamically allocating buffer size (#42)

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Sandeep Somavarapu 2025-02-10 17:56:51 +01:00 committed by GitHub
parent 5ec382d087
commit 9b1e64530a
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1 changed files with 20 additions and 6 deletions
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26
src/windows/RegistryPolicy.hh
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@ -74,18 +74,32 @@ private:
if (ERROR_SUCCESS != RegOpenKeyEx(root, registryKey.c_str(), 0, KEY_READ, &hKey)) if (ERROR_SUCCESS != RegOpenKeyEx(root, registryKey.c_str(), 0, KEY_READ, &hKey))
return std::nullopt; return std::nullopt;
BYTE buffer[1024]; DWORD bufferSize = 0;
DWORD bufferSize = sizeof(buffer);
DWORD type; DWORD type;
auto readResult = RegQueryValueEx(hKey, name.c_str(), 0, &type, buffer, &bufferSize); // First query to get required buffer size
auto result = RegQueryValueEx(hKey, name.c_str(), 0, &type, nullptr, &bufferSize);
if (ERROR_SUCCESS != result && ERROR_MORE_DATA != result)
{
RegCloseKey(hKey);
return std::nullopt;
}
if (std::find(supportedTypes.begin(), supportedTypes.end(), type) == supportedTypes.end())
{
RegCloseKey(hKey);
return std::nullopt;
}
std::vector<BYTE> buffer(bufferSize);
result = RegQueryValueEx(hKey, name.c_str(), 0, &type, buffer.data(), &bufferSize);
RegCloseKey(hKey); RegCloseKey(hKey);
if (ERROR_SUCCESS != readResult || if (ERROR_SUCCESS != result)
std::find(supportedTypes.begin(), supportedTypes.end(), type) == supportedTypes.end())
return std::nullopt; return std::nullopt;
return std::optional<T>{parseRegistryValue(buffer, bufferSize, type)}; return std::optional<T>{parseRegistryValue(buffer.data(), bufferSize, type)};
} }
}; };