/// <summary>
/// Reads the raw image information from the specified stream.
/// </summary>
/// <param name="decoder">The decoder.</param>
/// <param name="stream">The <see cref="Stream"/> containing image data.</param>
public static async Task <IImageInfo> IdentifyAsync(this IImageDecoderInternals decoder, Stream stream)
{
if (stream.CanSeek)
{
return(decoder.Identify(stream));
}
using MemoryStream ms = decoder.Configuration.MemoryAllocator.AllocateFixedCapacityMemoryStream(stream.Length);
await stream.CopyToAsync(ms).ConfigureAwait(false);
ms.Position = 0;
return(decoder.Identify(ms));
}
/// <summary>
/// Reads the raw image information from the specified stream.
/// </summary>
/// <param name="decoder">The decoder.</param>
/// <param name="configuration">The configuration for the image.</param>
/// <param name="stream">The <see cref="Stream"/> containing image data.</param>
/// <param name="tooLargeImageExceptionFactory">Factory method to handle <see cref="InvalidMemoryOperationException"/> as <see cref="InvalidImageContentException"/>.</param>
/// <param name="cancellationToken">The token to monitor for cancellation requests.</param>
/// <exception cref="ArgumentNullException"><paramref name="stream"/> is null.</exception>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public static Task <IImageInfo> IdentifyAsync(
this IImageDecoderInternals decoder,
Configuration configuration,
Stream stream,
Func <InvalidMemoryOperationException, Size, InvalidImageContentException> tooLargeImageExceptionFactory,
CancellationToken cancellationToken)
{
try
{
using var bufferedReadStream = new BufferedReadStream(configuration, stream);
IImageInfo imageInfo = decoder.Identify(bufferedReadStream, cancellationToken);
return(Task.FromResult(imageInfo));
}
catch (InvalidMemoryOperationException ex)
{
InvalidImageContentException invalidImageContentException = tooLargeImageExceptionFactory(ex, decoder.Dimensions);
return(Task.FromException <IImageInfo>(invalidImageContentException));
}
catch (OperationCanceledException)
{
return(Task.FromCanceled <IImageInfo>(cancellationToken));
}
catch (Exception ex)
{
return(Task.FromException <IImageInfo>(ex));
}
}
public static IImageInfo Identify(
this IImageDecoderInternals decoder,
Configuration configuration,
Stream stream)
{
using var bufferedReadStream = new BufferedReadStream(configuration, stream);
try
{
return(decoder.Identify(bufferedReadStream, default));
}
catch (InvalidMemoryOperationException ex)
{
throw new InvalidImageContentException(decoder.Dimensions, ex);
}
}
/// <summary> /// Reads the raw image information from the specified stream. /// </summary> /// <param name="decoder">The decoder.</param> /// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param> /// <exception cref="ArgumentNullException"><paramref name="stream"/> is null.</exception> /// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns> public static Task <IImageInfo> IdentifyAsync(this IImageDecoderInternals decoder, BufferedReadStream stream) => Task.FromResult(decoder.Identify(stream));
