async Task EnsureChunkHeaderWasReadAsync(
CancellationToken cancellationToken)
{
while (_currentChunkHeader == null)
{
cancellationToken.ThrowIfCancellationRequested();
// Read
var bytesRead = await _requestStream.ReadAsync(_readBuffer, 0, _readBuffer.Length);
HttpPrematureFinishException.ThrowIfZero(bytesRead);
// Append the data we just read to the header builder.
// If header is built after this call, we are done here.
int contentStartIndex;
if (_chunkHeaderBuilder.AppendBuffer(_readBuffer, 0, bytesRead, out contentStartIndex))
{
// Set current chunk metadata
_currentChunkHeader = _chunkHeaderBuilder.Result;
_currentChunkRemainingBytes = _chunkHeaderBuilder.Result.Length;
// If we read some bytes from the body, rollback those read.
_requestStream.TryRollbackFromIndex(
_readBuffer,
srcLength: bytesRead,
startIndex: contentStartIndex);
}
}
}
/// <summary>
/// Called when current chunk has no more data to read,
/// we'll do some cleaning here.
/// </summary>
async Task CompleteReadingCurrentChunkAsync()
{
// A chunk always nend with a new line character,
// let's skip it.
var bytesRead = await _requestStream.ReadAsync(_readBuffer, 0, _readBuffer.Length);
HttpPrematureFinishException.ThrowIfZero(bytesRead);
if (false == _lineBuilder.AppendBuffer(_readBuffer, 0, bytesRead, out int nextLineStartIndex))
{
throw new HttpBadRequestException(
"Chunk body must end with an empty line"
);
}
_lineBuilder.Reset();
_requestStream.TryRollbackFromIndex(_readBuffer, bytesRead, nextLineStartIndex);
// Prepare to read the next header
_chunkHeaderBuilder.Reset();
// Clear the header, so next ReadAsync() operation
// will attempt to read the next header
_currentChunkHeader = null;
}
public bool AppendBuffer(
byte[] buffer,
int start,
int count,
out int contentStartIndex)
{
Validation.RequireValidBuffer(buffer, start, count);
RequireNullResult();
// Early exit if there is no new line in the appended buffer;
contentStartIndex = default(int);
int nextLineStartIndex;
if (false == _lineBuilder.AppendBuffer(buffer, start, count, out nextLineStartIndex))
{
return(false);
}
// New line found in the supplied buffer!
// The chunk header ends here
contentStartIndex = nextLineStartIndex;
_result = BuildResult(_lineBuilder.Result);
return(true);
}
public void Reset()
{
_lineBuilder.Reset();
_result = null;
}