/// <summary>
/// Deserialize UTF8 JSON bytes from the supplied stream onto a <typeparamref name="T"/> instance.
/// </summary>
/// <typeparam name="T">The type being deserialized.</typeparam>
/// <param name="stream"><see cref="Stream"/>.</param>
/// <param name="instance">Instance to deserialize onto.</param>
/// <param name="stateMachine"><see cref="DeserializeStateMachine{T}"/>.</param>
/// <param name="bufferSize">Initial size of the buffer to use when reading from the <paramref name="stream"/>.</param>
/// <param name="cancellationToken"><see cref="CancellationToken"/>.</param>
/// <returns>Task to await the operation.</returns>
public static async Task DeserializeAsync <T>(Stream stream, T instance, DeserializeStateMachine <T> stateMachine, int bufferSize = 8192, CancellationToken cancellationToken = default)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (stateMachine == null)
{
throw new ArgumentNullException(nameof(stateMachine));
}
byte[] buffer = RentBufferFunc(bufferSize);
try
{
int state = 0;
JsonReaderState?readerState = null;
ContinueSingleBuffer:
int offset = 0;
int bytesRead;
while (true)
{
Memory <byte> data = new(buffer);
#if NETSTANDARD2_0
bytesRead = await stream.ReadAsync(buffer, offset, buffer.Length - offset, cancellationToken).ConfigureAwait(false);
#else
bytesRead = await stream.ReadAsync(offset > 0?data[offset..] : data, cancellationToken).ConfigureAwait(false);
/// <summary>
/// Deserialize UTF8 JSON bytes from the supplied stream into a <typeparamref name="T"/> instance.
/// </summary>
/// <typeparam name="T">The type being deserialized.</typeparam>
/// <param name="stream"><see cref="Stream"/>.</param>
/// <param name="stateMachine"><see cref="DeserializeStateMachine{T}"/>.</param>
/// <param name="bufferSize">Initial size of the buffer to use when reading from the <paramref name="stream"/>.</param>
/// <param name="cancellationToken"><see cref="CancellationToken"/>.</param>
/// <returns>Deserialized instance of <typeparamref name="T"/>.</returns>
public static async Task <T> DeserializeAsync <T>(Stream stream, DeserializeStateMachine <T> stateMachine, int bufferSize = 8192, CancellationToken cancellationToken = default)
where T : new()
{
T instance = new();
await DeserializeAsync(stream, instance, stateMachine, bufferSize, cancellationToken).ConfigureAwait(false);
return(instance);
}
