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// Copyright (C) 2024 Vaughn Nugent
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
using System;
using System.Reflection;
using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
using NCResult = System.Int64;
namespace VNLib.Utils.Cryptography.Noscrypt.@internal
{
public static class NCUtil
{
internal static void CheckResult<T>(NCResult result, bool raiseOnFailure) where T : Delegate
{
//Only negative values are errors
if (result >= NC_SUCCESS)
{
return;
}
NCResult asPositive = -result;
// Error code are only 8 bits, if an argument error occured, the
// argument number will be in the next upper 8 bits
NCErrorCodes errorCode = (NCErrorCodes)(asPositive & 0xFF);
byte argNumber = (byte)(asPositive >> 8 & 0xFF);
switch (errorCode)
{
case NCErrorCodes.E_NULL_PTR:
RaiseNullArgExceptionForArgumentNumber<T>(argNumber);
break;
case NCErrorCodes.E_INVALID_ARG:
RaiseArgExceptionForArgumentNumber<T>(argNumber);
break;
case NCErrorCodes.E_ARGUMENT_OUT_OF_RANGE:
RaiseOORExceptionForArgumentNumber<T>(argNumber);
break;
case NCErrorCodes.E_INVALID_CTX:
throw new InvalidOperationException("The library context object is null or invalid");
case NCErrorCodes.E_OPERATION_FAILED:
RaiseOperationFailedException(raiseOnFailure);
break;
case NCErrorCodes.E_VERSION_NOT_SUPPORTED:
throw new NotSupportedException("The requested version is not supported");
default:
if (raiseOnFailure)
{
throw new InvalidOperationException($"The operation failed with error, code: {errorCode} for arugment {argNumber:x}");
}
break;
}
}
private static void RaiseOperationFailedException(bool raise)
{
if (raise)
{
throw new InvalidOperationException("The operation failed for an unknown reason");
}
}
private static void RaiseNullArgExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
{
//Get delegate parameters
Type type = typeof(T);
ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
throw new ArgumentNullException(arg.Name, "Argument is null or invalid cannot continue");
}
private static void RaiseArgExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
{
//Get delegate parameters
Type type = typeof(T);
ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
throw new ArgumentException("Argument is null or invalid cannot continue", arg.Name);
}
private static void RaiseOORExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
{
//Get delegate parameters
Type type = typeof(T);
ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
throw new ArgumentOutOfRangeException(arg.Name, "Argument is out of range of acceptable values");
}
}
}
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