public async Task CopyToWithFullBufferAsync()
{
var content = new byte[1234];
var r = new Random();
r.NextBytes(content);
using (var testReadStream = new PartialReadStream(content, 100))
{
int bytesWritten = 0;
using (var testWriteStream = new WriteCallbackStream((bufferToWrite, offset, count) =>
{
Assert.Equal(250, bufferToWrite.Length);
bytesWritten += count;
if (bytesWritten < content.Length)
{
Assert.Equal(250, count);
}
else
{
Assert.Equal(content.Length % 250, count);
}
}))
{
await testReadStream.CopyToWithFullBufferAsync(testWriteStream, 250);
}
}
}
/// <summary>
/// Verifies that the stream reader reads multiple times when a stream
/// only returns a subset of the data from each Read.
/// </summary>
private static async Task TestReaderFromPartialReadStream(Func <ArrowStreamReader, RecordBatch, Task> verificationFunc)
{
RecordBatch originalBatch = TestData.CreateSampleRecordBatch(length: 100);
using (PartialReadStream stream = new PartialReadStream())
{
ArrowStreamWriter writer = new ArrowStreamWriter(stream, originalBatch.Schema);
await writer.WriteRecordBatchAsync(originalBatch);
stream.Position = 0;
ArrowStreamReader reader = new ArrowStreamReader(stream);
await verificationFunc(reader, originalBatch);
}
}
public async Task ReadBytes()
{
var content = new byte[100];
var r = new Random();
r.NextBytes(content);
var buffer = new byte[100];
using (var testReadStream = new PartialReadStream(content, buffer.Length / 2))
{
await testReadStream.ReadBytes(buffer, buffer.Length);
Assert.True(content.SequenceEqual(buffer));
}
}