private Buffer LoadBuffer(long position)
{
bool isLast = false;
if (position + bufferSize >= Length)
{
position = Math.Max(0, Length - bufferSize);
isLast = true;
}
var range = new CloudStorageResourceRange(position, Math.Min(bufferSize, Length - position));
Console.WriteLine($"Seekable stream requesting byte range at {range.Offset} length {range.Length}");
var objReq = Task.Run(() => { return(_CloudStorage.GetObjectStreamAsync(_ResourceName, range)); }).Result;
var ms = new MemoryStream((int)range.Length);
objReq.CopyTo(ms);
return(new Buffer()
{
Position = position,
Data = ms,
BytesAvail = ms.Length,
IsLast = isLast
});
}
public async Task <Stream> OpenAsync()
{
var range = new CloudStorageResourceRange(OffsetOfCompressedData, CompressedLength);
Console.WriteLine($"Cloud zip archive entry requesting byte range at {range.Offset} length {range.Length}");
var resp = await _CloudStorage.GetObjectStreamAsync(_ResourceName, range);
return(GetDataDecompressor(resp));
}
/// <summary>
/// Get Object
/// </summary>
/// <param name="resource"></param>
/// <param name="range">(optional)</param>
/// <returns></returns>
public async Task <Stream> GetObjectStreamAsync(
ICloudStorageResourceName resource, CloudStorageResourceRange range = null)
{
Stream stream = null;
if (resource is S3CloudStorageResourceName s3resource)
{
var req = new GetObjectRequest {
BucketName = s3resource.Name, Key = s3resource.ObjectKey
};
if (range != null)
{
req.ByteRange = new ByteRange(range.Offset, range.Offset + range.Length - 1);
}
var objectResponse = await S3Client.GetObjectAsync(req);
stream = objectResponse.ResponseStream;
}
return(stream);
}
