/// <summary>
/// Non rented array input, Array is Input
/// </summary>
/// <param name="array"></param>
/// <param name="readLength"></param>
public ReadResult(byte[] array, int readLength)
{
if (array is null)
{
ThrowHelpers.ByteArrayCannotBeNull();
}
if ((uint)readLength > (uint)array.Length)
{
ThrowHelpers.ReadLengthCannotBeOutOfBounds();
}
Array = array;
Source = null;
ReadLength = readLength;
IsArrayRented = false;
ShouldDisposeStream = false;
ShouldResetStreamPosition = false;
}
/// <summary>
/// Reads the file header - first (16) bytes from the file
/// </summary>
/// <param name="file">The file to work with</param>
/// <returns>Array of bytes</returns>
public static ReadResult ReadFileHeader(FileInfo file)
{
if (file is null)
{
ThrowHelpers.FileInfoCannotBeNull();
}
if (!file.Exists)
{
ThrowHelpers.FileDoesNotExist(file);
}
FileStream fileStream = file.OpenRead();
byte[] header = ArrayPool <byte> .Shared.Rent(MimeTypes.MaxHeaderSize);
int bytesRead = fileStream.Read(header, 0, MimeTypes.MaxHeaderSize);
return(new ReadResult(header, fileStream, bytesRead, isArrayRented: true, shouldDisposeStream: true, shouldResetStreamPosition: false));
}
//TODO Figure out how to handle non-seekable Streams
/// <summary>
/// Takes a stream does, not dispose of stream, resets read position to beginning though
/// </summary>
/// <param name="stream"></param>
/// <param name="MaxHeaderSize"></param>
/// <returns></returns>
public static async Task <ReadResult> ReadHeaderFromStreamAsync(Stream stream, bool shouldDisposeStream = false, bool shouldResetStreamPosition = true)
{
if (stream is null)
{
ThrowHelpers.StreamCannotBeNull();
}
if (!stream.CanRead)
{
ThrowHelpers.CannotReadFromStream();
}
if (stream.CanSeek && stream.Position > 0)
{
stream.Seek(0, SeekOrigin.Begin);
}
byte[] header = ArrayPool <byte> .Shared.Rent(MimeTypes.MaxHeaderSize);
int bytesRead = await stream.ReadAsync(header, 0, MimeTypes.MaxHeaderSize);
return(new ReadResult(header, stream, bytesRead, isArrayRented: true, shouldDisposeStream, shouldResetStreamPosition));
}
