public BaseMatBlazorStream(IJSRuntime jsRuntime, ElementReference reference, MatFileUploadEntry entry)
{
_jsRuntime = jsRuntime;
_reference = reference;
_entry = entry;
_position = 0;
}
public BaseMatBlazorStreamReader(IJSRuntime jsRuntime, ElementReference reference, MatFileUploadEntry entry,
BaseMatFileUpload component)
{
_jsRuntime = jsRuntime;
_reference = reference;
_entry = entry;
_component = component;
}
// private readonly int _maxMessageSize;
// private readonly PreFetchingSequence<Block> _blockSequence;
// private Block? _currentBlock;
// private byte[] _currentBlockDecodingBuffer;
// private int _currentBlockDecodingBufferConsumedLength;
//
// public MatBlazorRemoteStream(IJSRuntime jsRuntime, ElementReference inputFileElement, MatFileUploadEntry entry,
// int maxMessageSize, int maxBufferSize)
// : base(jsRuntime, inputFileElement, entry)
// {
// _maxMessageSize = maxMessageSize;
// _blockSequence = new PreFetchingSequence<Block>(
// FetchBase64Block,
// (entry.Size + _maxMessageSize - 1) / _maxMessageSize,
// Math.Max(1, maxBufferSize / _maxMessageSize)); // Degree of parallelism on fetch
// _currentBlockDecodingBuffer = new byte[_maxMessageSize];
// }
//
// protected override async Task<int> CopyFileDataIntoBuffer(long sourceOffset, byte[] destination,
// int destinationOffset, int maxBytes, CancellationToken cancellationToken)
// {
// var totalBytesCopied = 0;
//
// while (maxBytes > 0)
// {
// // If we don't yet have a block, or it's fully consumed, get the next one
// if (!_currentBlock.HasValue ||
// _currentBlockDecodingBufferConsumedLength == _currentBlock.Value.LengthBytes)
// {
// // If we've already read some data, and the next block is still pending,
// // then just return now rather than awaiting
// if (totalBytesCopied > 0
// && _blockSequence.TryPeekNext(out var nextBlock)
// && !nextBlock.Base64.IsCompleted)
// {
// break;
// }
//
// _currentBlock = _blockSequence.ReadNext(cancellationToken);
// var currentBlockBase64 = await _currentBlock.Value.Base64;
//
// // As a possible future optimisation, if we know the current block will fit entirely in
// // the remaining destination space, we could decode directly into the destination without
// // going via _currentBlockDecodingBuffer. However that complicates the logic a lot.
// DecodeBase64ToBuffer(currentBlockBase64, _currentBlockDecodingBuffer, 0,
// _currentBlock.Value.LengthBytes);
// _currentBlockDecodingBufferConsumedLength = 0;
// }
//
// // How much of the current block can we fit into the destination?
// var numUnconsumedBytesInBlock =
// _currentBlock.Value.LengthBytes - _currentBlockDecodingBufferConsumedLength;
// var numBytesToTransfer = Math.Min(numUnconsumedBytesInBlock, maxBytes);
// if (numBytesToTransfer == 0)
// {
// break;
// }
//
// // Perform the copy
// Array.Copy(_currentBlockDecodingBuffer, _currentBlockDecodingBufferConsumedLength, destination,
// destinationOffset, numBytesToTransfer);
// maxBytes -= numBytesToTransfer;
// destinationOffset += numBytesToTransfer;
// _currentBlockDecodingBufferConsumedLength += numBytesToTransfer;
// totalBytesCopied += numBytesToTransfer;
// }
//
// return totalBytesCopied;
// }
//
// private Block FetchBase64Block(long index, CancellationToken cancellationToken)
// {
// var sourceOffset = index * _maxMessageSize;
// var blockLength = (int) Math.Min(_maxMessageSize, _entry.Size - sourceOffset);
// var task = _jsRuntime.InvokeAsync<string>(
// "matBlazor.matFileUpload.readFileData",
// cancellationToken,
// _inputFileElement,
// _entry.Id,
// index * _maxMessageSize,
// blockLength).AsTask();
// return new Block(task, blockLength);
// }
//
// private int DecodeBase64ToBuffer(string base64, byte[] buffer, int offset, int maxBytesToRead)
// {
// #if NETSTANDARD2_1
// var bufferWithOffset = new Span<byte>(buffer, offset, maxBytesToRead);
// return Convert.TryFromBase64String(base64, bufferWithOffset, out var actualBytesRead)
// ? actualBytesRead
// : throw new InvalidOperationException("Failed to decode base64 data");
// #else
// var bytes = Convert.FromBase64String(base64);
// if (bytes.Length > maxBytesToRead)
// {
// throw new InvalidOperationException($"Requested a maximum of {maxBytesToRead}, but received {bytes.Length}");
// }
// Array.Copy(bytes, 0, buffer, offset, bytes.Length);
// return bytes.Length;
// #endif
// }
//
// private readonly struct Block
// {
// public readonly Task<string> Base64;
// public readonly int LengthBytes;
//
// public Block(Task<string> base64, int lengthBytes)
// {
// Base64 = base64;
// LengthBytes = lengthBytes;
// }
// }
public MatBlazorRemoteStream(IJSRuntime jsRuntime, ElementReference reference, MatFileUploadEntry entry)
: base(jsRuntime, reference, entry)
{
}
public MatBlazorRemoteStreamReader(IJSRuntime jsRuntime, ElementReference reference, MatFileUploadEntry entry,
int messageSize, int messageLength, BaseMatFileUpload component)
: base(jsRuntime, reference, entry, component)
{
_messageSize = messageSize;
_messageLength = messageLength;
}
public async Task WriteToStreamAsync(MatFileUploadEntry matFileUploadEntry, Stream stream)
{
await new MatBlazorRemoteStreamReader(Js, Ref, matFileUploadEntry, MaxMessageSize, MaxMessageLength, this)
.WriteToStreamAsync(stream, CancellationToken.None);
}
public async Task <Stream> ReadAsStreamAsync(MatFileUploadEntry matFileUploadEntry)
{
return(new MatBlazorRemoteStream(Js, Ref, matFileUploadEntry));
}
