| public Read ( byte buffer, int offset, int count ) : int | ||
| buffer | byte | |
| offset | int | |
| count | int | |
| Результат | int | |
public override int Read(byte[] buffer, int offset, int count)
{
int startOffset = (int)(_position % _blockSize);
if (startOffset == 0 && (count % _blockSize == 0 || _position + count == Length))
{
// Aligned read - pass through to underlying stream.
WrappedStream.Position = _position;
int numRead = WrappedStream.Read(buffer, offset, count);
_position += numRead;
return(numRead);
}
long startPos = MathUtilities.RoundDown(_position, _blockSize);
long endPos = MathUtilities.RoundUp(_position + count, _blockSize);
if (endPos - startPos > int.MaxValue)
{
throw new IOException("Oversized read, after alignment");
}
byte[] tempBuffer = new byte[endPos - startPos];
WrappedStream.Position = startPos;
int read = WrappedStream.Read(tempBuffer, 0, tempBuffer.Length);
int available = Math.Min(count, read - startOffset);
Array.Copy(tempBuffer, startOffset, buffer, offset, available);
_position += available;
return(available);
}
public override int Read(byte[] buffer, int offset, int count)
{
try {
if (Interlocked.Increment(ref m_ReadNesting) != 1)
{
throw new NotSupportedException(SR.GetString(SR.net_io_invalidnestedcall, "Read", "read"));
}
if (m_HeadEOF)
{
return(WrappedStream.Read(buffer, offset, count));
}
else
{
int result = m_HeadStream.Read(buffer, offset, count);
m_HeadLength += result;
if (result == 0 && count != 0)
{
m_HeadEOF = true;
m_HeadStream.Close();
result = WrappedStream.Read(buffer, offset, count);
}
return(result);
}
}
finally {
Interlocked.Decrement(ref m_ReadNesting);
}
}
private void DoOperation(ModifyStream modifyStream, ModifyBuffer modifyBuffer, int count)
{
int startOffset = (int)(_position % _blockSize);
if (startOffset == 0 && (count % _blockSize == 0 || _position + count == Length))
{
WrappedStream.Position = _position;
modifyStream(WrappedStream, 0, count);
_position += count;
return;
}
long unalignedEnd = _position + count;
long alignedPos = MathUtilities.RoundDown(_position, _blockSize);
if (startOffset != 0)
{
WrappedStream.Position = alignedPos;
WrappedStream.Read(_alignmentBuffer, 0, _blockSize);
modifyBuffer(_alignmentBuffer, startOffset, 0, Math.Min(count, _blockSize - startOffset));
WrappedStream.Position = alignedPos;
WrappedStream.Write(_alignmentBuffer, 0, _blockSize);
}
alignedPos = MathUtilities.RoundUp(_position, _blockSize);
if (alignedPos >= unalignedEnd)
{
_position = unalignedEnd;
return;
}
int passthroughLength = (int)MathUtilities.RoundDown(_position + count - alignedPos, _blockSize);
if (passthroughLength > 0)
{
WrappedStream.Position = alignedPos;
modifyStream(WrappedStream, (int)(alignedPos - _position), passthroughLength);
}
alignedPos += passthroughLength;
if (alignedPos >= unalignedEnd)
{
_position = unalignedEnd;
return;
}
WrappedStream.Position = alignedPos;
WrappedStream.Read(_alignmentBuffer, 0, _blockSize);
modifyBuffer(_alignmentBuffer, 0, (int)(alignedPos - _position), (int)Math.Min(count - (alignedPos - _position), unalignedEnd - alignedPos));
WrappedStream.Position = alignedPos;
WrappedStream.Write(_alignmentBuffer, 0, _blockSize);
_position = unalignedEnd;
}
public async Task Parameterized_Methods_Are_Properly_Wrapped()
{
var strm = Substitute.For <Stream>();
strm.CanRead.Returns(true);
strm.CanWrite.Returns(true);
using (var wrprstrm = new WrappedStream(strm, false))
{
wrprstrm.Seek(0, SeekOrigin.Current);
strm.Received(1).Seek(0, SeekOrigin.Current);
wrprstrm.SetLength(10);
strm.Received(1).SetLength(10);
var arrByte = new byte[5];
wrprstrm.Read(arrByte, 0, arrByte.Length);
strm.Received(1).Read(arrByte, 0, arrByte.Length);
wrprstrm.Write(arrByte, 0, arrByte.Length);
strm.Received(1).Write(arrByte, 0, arrByte.Length);
var anotherStrm = new MemoryStream();
await wrprstrm.CopyToAsync(anotherStrm, 1, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1).CopyToAsync(anotherStrm, 1, CancellationToken.None).ConfigureAwait(false);
await wrprstrm.FlushAsync(CancellationToken.None).ConfigureAwait(false);
await strm.Received(1).FlushAsync(CancellationToken.None).ConfigureAwait(false);
await wrprstrm.WriteAsync(arrByte, 1, arrByte.Length, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1)
.WriteAsync(arrByte, 1, arrByte.Length, CancellationToken.None)
.ConfigureAwait(false);
await wrprstrm.ReadAsync(arrByte, 1, arrByte.Length, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1)
.ReadAsync(arrByte, 1, arrByte.Length, CancellationToken.None)
.ConfigureAwait(false);
wrprstrm.WriteByte(20);
strm.Received(1).WriteByte(20);
var _ = wrprstrm.Equals(null);
var __ = strm.Received(1).Equals(null);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (m_Position >= m_Offset + m_Size)
{
return(0);
}
if (m_Position + count > m_Offset + m_Size)
{
count = (int)(m_Offset + m_Size - m_Position);
}
int result = WrappedStream.Read(buffer, offset, count);
m_Position += result;
return(result);
}
public void WrappedStream_Tests()
{
var memoryStream = new MemoryStream(Enumerable.Range(0, 128).Select(i => (byte)i).ToArray(), false);
var buffer = new byte[128];
memoryStream.Position = 20;
var wrapper = new WrappedStream(memoryStream, 100);
var read = wrapper.Read(buffer, 0, 3);
CollectionAssert.AreEqual(new byte[] { 20, 21, 22 }, buffer.Take(read));
//do not pass the length of the wrapper
memoryStream.Position = 10;
wrapper = new WrappedStream(memoryStream, 2);
read = wrapper.Read(buffer, 0, 100);
CollectionAssert.AreEqual(new byte[] { 10, 11 }, buffer.Take(read));
//do not pass the length of the internal stream
memoryStream.Position = 126;
wrapper = new WrappedStream(memoryStream, 2);
read = wrapper.Read(buffer, 0, 100);
CollectionAssert.AreEqual(new byte[] { 126, 127 }, buffer.Take(read));
}
/// <summary> /// Reads a sequence of bytes from the current stream and advances the position /// within the stream by the number of bytes read. /// </summary> public override int Read(byte[] buffer, int offset, int count) => WrappedStream.Read(buffer, offset, count);
public override int Read(byte[] buffer, int offset, int count) => WrappedStream.Read(buffer, offset, Math.Min(count, 2));
public override int Read(byte[] buffer, int offset, int count)
{
return(WrappedStream.Read(buffer, offset, count));
}
/// <summary>
/// Reads a sequence of bytes from the current stream and advances the position
/// within the stream by the number of bytes read.
/// </summary>
public override int Read(byte[] buffer, int offset, int count)
{
ThrowIfDisposed();
return(WrappedStream.Read(buffer, offset, count));
}
public async Task Parameterized_Methods_Are_Properly_Wrapped()
{
var strm = Substitute.For <Stream>();
using (var wrprstrm = new WrappedStream(strm, false))
{
wrprstrm.Seek(0, SeekOrigin.Current);
strm.Received(1).Seek(0, SeekOrigin.Current);
wrprstrm.SetLength(10);
strm.Received(1).SetLength(10);
var arrByte = new byte[5];
wrprstrm.Read(arrByte, 0, arrByte.Length);
strm.Received(1).Read(arrByte, 0, arrByte.Length);
wrprstrm.Write(arrByte, 0, arrByte.Length);
strm.Received(1).Write(arrByte, 0, arrByte.Length);
var anotherStrm = new MemoryStream();
await wrprstrm.CopyToAsync(anotherStrm, 1, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1).CopyToAsync(anotherStrm, 1, CancellationToken.None).ConfigureAwait(false);
await wrprstrm.FlushAsync(CancellationToken.None).ConfigureAwait(false);
await strm.Received(1).FlushAsync(CancellationToken.None).ConfigureAwait(false);
await wrprstrm.WriteAsync(arrByte, 1, arrByte.Length, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1)
.WriteAsync(arrByte, 1, arrByte.Length, CancellationToken.None)
.ConfigureAwait(false);
await wrprstrm.ReadAsync(arrByte, 1, arrByte.Length, CancellationToken.None).ConfigureAwait(false);
await strm.Received(1)
.ReadAsync(arrByte, 1, arrByte.Length, CancellationToken.None)
.ConfigureAwait(false);
var cb = new AsyncCallback(ar => { });
var result = wrprstrm.BeginRead(arrByte, 0, arrByte.Length, cb, null);
strm.Received(1).BeginRead(arrByte, 0, arrByte.Length, cb, null);
wrprstrm.BeginWrite(arrByte, 0, arrByte.Length, cb, null);
strm.Received(1).BeginWrite(arrByte, 0, arrByte.Length, cb, null);
#if FEATURE_REMOTING
wrprstrm.CreateObjRef(null);
strm.Received(1).CreateObjRef(null);
wrprstrm.InitializeLifetimeService();
strm.Received(1).InitializeLifetimeService();
#else
Assert.True(Assert.Throws <RemotingException>(() => wrprstrm.CreateObjRef(null))
.Message.Equals(WrappedStream.RemotingErrorTxt));
Assert.True(Assert.Throws <RemotingException>(() => wrprstrm.InitializeLifetimeService())
.Message.Equals(WrappedStream.RemotingErrorTxt));
#endif
wrprstrm.EndRead(result);
strm.Received(1).EndRead(result);
wrprstrm.EndWrite(result);
strm.Received(1).EndWrite(result);
wrprstrm.WriteByte(20);
strm.Received(1).WriteByte(20);
wrprstrm.Equals(null);
strm.Received(1).Equals(null);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
bool isDoingWrite = false;
int result = -1;
if (Interlocked.Increment(ref m_ReadNesting) != 1)
{
throw new NotSupportedException(SR.GetString(SR.net_io_invalidnestedcall, "Read", "read"));
}
try {
if (m_BytesToSkip != 0L)
{
// Sometime we want to combine cached + live stream AND the user requested explicit range starts from not 0
byte[] tempBuffer = new byte[4096];
while (m_BytesToSkip != 0L)
{
int bytes = WrappedStream.Read(tempBuffer, 0, (m_BytesToSkip < (long)tempBuffer.Length? (int)m_BytesToSkip: tempBuffer.Length));
if (bytes == 0)
{
m_SeenReadEOF = true;
}
m_BytesToSkip -= bytes;
if (!m_ShadowStreamIsDead)
{
m_ShadowStream.Write(tempBuffer, 0, bytes);
}
}
}
result = WrappedStream.Read(buffer, offset, count);
if (result == 0)
{
m_SeenReadEOF = true;
}
if (m_ShadowStreamIsDead)
{
return(result);
}
isDoingWrite = true;
m_ShadowStream.Write(buffer, offset, result);
return(result);
}
catch (Exception e) {
if (e is ThreadAbortException || e is StackOverflowException || e is OutOfMemoryException)
{
throw;
}
GlobalLog.Print("ShadowReadStream::Read() Got Exception, disabling the shadow stream, stack trace = " + e.ToString());
if (!m_ShadowStreamIsDead)
{
// try to ignore even serious exception, since got nothing to loose?
m_ShadowStreamIsDead = true;
try {
if (m_ShadowStream is ICloseEx)
{
((ICloseEx)m_ShadowStream).CloseEx(CloseExState.Abort | CloseExState.Silent);
}
else
{
m_ShadowStream.Close();
}
}
catch (Exception ee) {
if (e is ThreadAbortException || e is StackOverflowException || e is OutOfMemoryException)
{
throw;
}
GlobalLog.Print("ShadowReadStream::Read() Got (ignoring) Exception, on shadow stream.Close, stack trace = " + ee.ToString());
}
}
if (!isDoingWrite || m_ThrowOnWriteError)
{
throw;
}
return(result);
}
finally {
Interlocked.Decrement(ref m_ReadNesting);
}
}