// constructors
public GridFSSeekableDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument)
: base(bucket, binding, filesCollectionDocument)
{
}
// constructors
public GridFSSeekableDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument)
: base(bucket, binding, filesCollectionDocument)
{
}
// constructors
protected GridFSDownloadStreamBase(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument)
{
_bucket = bucket;
_binding = binding;
_filesCollectionDocument = filesCollectionDocument;
}
// constructors
protected GridFSDownloadStreamBase(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument)
{
_bucket = bucket;
_binding = binding;
_filesCollectionDocument = filesCollectionDocument;
}
// constructors
public GridFSForwardOnlyDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument,
bool checkMD5)
: base(bucket, binding, filesCollectionDocument)
{
_checkMD5 = checkMD5;
if (_checkMD5)
{
_md5 = MD5.Create();
}
_lastChunkNumber = (int)((filesCollectionDocument.Length - 1) / filesCollectionDocument.ChunkSizeBytes);
_lastChunkSize = (int)(filesCollectionDocument.Length % filesCollectionDocument.ChunkSizeBytes);
if (_lastChunkSize == 0)
{
_lastChunkSize = filesCollectionDocument.ChunkSizeBytes;
}
}
// constructors
public GridFSForwardOnlyDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFilesCollectionDocument filesCollectionDocument,
bool checkMD5)
: base(bucket, binding, filesCollectionDocument)
{
_checkMD5 = checkMD5;
if (_checkMD5)
{
_md5 = MD5.Create();
}
_lastChunkNumber = (int)((filesCollectionDocument.Length - 1) / filesCollectionDocument.ChunkSizeBytes);
_lastChunkSize = (int)(filesCollectionDocument.Length % filesCollectionDocument.ChunkSizeBytes);
if (_lastChunkSize == 0)
{
_lastChunkSize = filesCollectionDocument.ChunkSizeBytes;
}
}
private async Task DownloadToStreamAsyncHelper(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, Stream destination, GridFSDownloadOptions options = null, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream(this, binding.Fork(), filesCollectionDocument, checkMD5))
{
var count = source.Length;
var buffer = new byte[filesCollectionDocument.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
await source.ReadBytesAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
await destination.WriteAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
count -= partialCount;
}
await source.CloseAsync(cancellationToken).ConfigureAwait(false);
}
}
private async Task DownloadToStreamHelperAsync(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, Stream destination, GridFSDownloadOptions options = null, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream(this, binding.Fork(), filesCollectionDocument, checkMD5))
{
var count = source.Length;
var buffer = new byte[filesCollectionDocument.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
await source.ReadBytesAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
await destination.WriteAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
count -= partialCount;
}
await source.CloseAsync(cancellationToken).ConfigureAwait(false);
}
}
private async Task<byte[]> DownloadAsBytesHelperAsync(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
if (filesCollectionDocument.Length > int.MaxValue)
{
throw new NotSupportedException("GridFS stored file is too large to be returned as a byte array.");
}
using (var destination = new MemoryStream((int)filesCollectionDocument.Length))
{
await DownloadToStreamHelperAsync(binding, filesCollectionDocument, destination, options, cancellationToken).ConfigureAwait(false);
return destination.GetBuffer();
}
}
private GridFSDownloadStream CreateDownloadStream(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, GridFSDownloadOptions options = null, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
var seekable = options.Seekable ?? false;
if (checkMD5 && seekable)
{
throw new ArgumentException("CheckMD5 can only be used when Seekable is false.");
}
if (seekable)
{
return new GridFSSeekableDownloadStream(this, binding, filesCollectionDocument);
}
else
{
return new GridFSForwardOnlyDownloadStream(this, binding, filesCollectionDocument, checkMD5);
}
}
private async Task <byte[]> DownloadAsBytesAsyncHelper(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
if (filesCollectionDocument.Length > int.MaxValue)
{
throw new NotSupportedException("GridFS stored file is too large to be returned as a byte array.");
}
using (var destination = new MemoryStream((int)filesCollectionDocument.Length))
{
await DownloadToStreamAsyncHelper(binding, filesCollectionDocument, destination, options, cancellationToken).ConfigureAwait(false);
return(destination.GetBuffer());
}
}
private GridFSDownloadStream CreateDownloadStream(IReadBindingHandle binding, GridFSFilesCollectionDocument filesCollectionDocument, GridFSDownloadOptions options = null, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
var seekable = options.Seekable ?? false;
if (checkMD5 && seekable)
{
throw new ArgumentException("CheckMD5 can only be used when Seekable is false.");
}
if (seekable)
{
return(new GridFSSeekableDownloadStream(this, binding, filesCollectionDocument));
}
else
{
return(new GridFSForwardOnlyDownloadStream(this, binding, filesCollectionDocument, checkMD5));
}
}
