[BUG]: loglevel 0 and 1 from llama.cpp doesn't seem to be supported

[LoicDagnas]

Description

Since this PR on llama.cpp, log levels are not anymore between 2 and 5 but between 0 and 4 here. So I guess that the log level mapping should be adapted here.

Reproduction Steps

Adding with NativeLogConfig.llama_log_set(new LlamaSharpLogger()); this very naive custom logger:

internal sealed class LlamaSharpLogger : ILogger
{
    public IDisposable BeginScope<TState>(TState state) => default;

    public void Log<TState>(
        LogLevel logLevel,
        EventId eventId,
        TState state,
        Exception exception,
        Func<TState, Exception, string> formatter)
    {

    }

    public bool IsEnabled(LogLevel logLevel) => true;
}

any call to LlamaWeights.LoadFromFile("...") will fails with an ArgumentOutOfRangeException.

Environment & Configuration

• Operating system: Windows
• .NET runtime version: 8.0
• LLamaSharp version: 0.19
• CUDA version (if you are using cuda backend): 12
• CPU & GPU device: RTX 3000

Known Workarounds

No response

[martindevans]

Thanks for the detailed report!

You've located the correct location to fix the problem, would you be interested in putting together a PR with the necessary changes?