internal static async Task <Match> MatchLineAsync(this IAsyncEnumerator <byte> enumerator, Regex regex)
{
// Validate parameters.
if (enumerator == null)
{
throw new ArgumentNullException(nameof(enumerator));
}
if (regex == null)
{
throw new ArgumentNullException(nameof(regex));
}
// The line.
string line = await enumerator.ReadLineAsync().ConfigureAwait(false);
// Match.
Match match = regex.Match(line);
// If not successful, throw an exception.
if (!match.Success)
{
throw new InvalidOperationException($"The regular expression did not match the line. (regex: { regex }, line: { line }");
}
// Return the match.
return(match);
}
internal static async Task SetHeaderFieldsAsync(this HttpResponseMessage response,
IAsyncEnumerator <byte> enumerator,
CancellationToken cancellationToken)
{
// Validate parameters.
if (response == null)
{
throw new ArgumentNullException(nameof(response));
}
if (enumerator == null)
{
throw new ArgumentNullException(nameof(enumerator));
}
// The line.
string line;
// The field and value.
string field = null;
string value = null;
// While the line is not null or empty.
while (!string.IsNullOrEmpty(line = await enumerator.ReadLineAsync(cancellationToken).ConfigureAwait(false)))
{
// The match.
Match match;
// Does this match a folded value? If so, add to the previous value.
if ((match = FoldedHeaderFieldRegex.Match(line)).Success)
{
// Add to the previous value.
value += " " + match.GetGroupValue("value");
}
else if ((match = HeaderFieldRegex.Match(line)).Success)
{
// If the field and value are set, then set them now.
if (field != null && value != null)
{
response.Headers.TryAddWithoutValidation(field, value);
}
// Set the field and the value.
field = match.GetGroupValue("fieldName");
value = match.GetGroupValue("fieldValue");
}
}
// If the field and value are set, then set them now.
if (field != null && value != null)
{
response.Headers.TryAddWithoutValidation(field, value);
}
}
internal static async Task <HttpContent> ReadHttpContentFromChunkedTransferEncoding(this IAsyncEnumerator <byte> enumerator,
HttpResponseMessage response, CancellationToken cancellationToken)
{
// Validate parameters.
if (enumerator == null)
{
throw new ArgumentNullException(nameof(enumerator));
}
if (response == null)
{
throw new ArgumentNullException(nameof(response));
}
// The memory stream.
var ms = new MemoryStream();
// Continue forever.
while (true)
{
// Read the array buffer as a string.
string chunkSize = await enumerator.ReadLineAsync(cancellationToken).ConfigureAwait(false);
// Match.
Match match = ChunkSizeRegex.Match(chunkSize);
// Convert to a length.
int length = int.Parse(match.GetGroupValue("chunkSize"), NumberStyles.HexNumber);
// If 0, get out.
if (length == 0 && !match.Groups["chunkExtension"].Success)
{
// Get out.
break;
}
// While there are bytes to read.
while (length-- > 0 && await enumerator.MoveNext(cancellationToken).ConfigureAwait(false))
{
ms.WriteByte(enumerator.Current);
}
// Read the bytes.
var line = await enumerator.ReadLineBytesAsync(cancellationToken).ConfigureAwait(false);
// If not empty, throw.
if (line.Count > 0)
{
throw new InvalidOperationException("An unexpected byte sequence was encountered after processing chunked encoding data.");
}
}
// Set the header fields again. This is for extra headers that
// may be passed down.
await response.SetHeaderFieldsAsync(enumerator, cancellationToken).ConfigureAwait(false);
// Reset the memory stream.
ms.Seek(0, SeekOrigin.Begin);
// Return the content.
return(new StreamContent(ms));
}
