/// <summary>
/// <see cref="HttpContent"/> implementation which provides a byte range view over a stream used to generate HTTP
/// 206 (Partial Content) byte range responses. If none of the requested ranges overlap with the current extend
/// of the selected resource represented by the <paramref name="content"/> parameter then an
/// <see cref="InvalidByteRangeException"/> is thrown indicating the valid Content-Range of the content.
/// </summary>
/// <param name="content">The stream over which to generate a byte range view.</param>
/// <param name="range">The range or ranges, typically obtained from the Range HTTP request header field.</param>
/// <param name="mediaType">The media type of the content stream.</param>
/// <param name="bufferSize">The buffer size used when copying the content stream.</param>
public ByteRangeStreamContent(Stream content, RangeHeaderValue range, MediaTypeHeaderValue mediaType, int bufferSize)
{
if (content == null)
{
throw new ArgumentNullException("content");
}
if (!content.CanSeek)
{
throw new ArgumentException("content", RS.Format(Resources.ByteRangeStreamNotSeekable, typeof(ByteRangeStreamContent).Name));
}
if (range == null)
{
throw new ArgumentNullException("range");
}
if (mediaType == null)
{
throw new ArgumentNullException("mediaType");
}
if (bufferSize < MinBufferSize)
{
throw new ArgumentOutOfRangeException("bufferSize", bufferSize, RS.Format(Resources.ArgumentMustBeGreaterThanOrEqualTo, MinBufferSize));
}
if (!range.Unit.Equals(SupportedRangeUnit, StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(RS.Format(Resources.ByteRangeStreamContentNotBytesRange, range.Unit, SupportedRangeUnit), "range");
}
try
{
// If we have more than one range then we use a multipart/byteranges content type as wrapper.
// Otherwise we use a non-multipart response.
if (range.Ranges.Count > 1)
{
// Create Multipart content and copy headers to this content
MultipartContent rangeContent = new MultipartContent(ByteRangesContentSubtype);
_byteRangeContent = rangeContent;
foreach (RangeItemHeaderValue rangeValue in range.Ranges)
{
try
{
ByteRangeStream rangeStream = new ByteRangeStream(content, rangeValue);
HttpContent rangeBodyPart = new StreamContent(rangeStream, bufferSize);
rangeBodyPart.Headers.ContentType = mediaType;
rangeBodyPart.Headers.ContentRange = rangeStream.ContentRange;
rangeContent.Add(rangeBodyPart);
}
catch (ArgumentOutOfRangeException)
{
// We ignore range errors until we check that we have at least one valid range
}
}
// If no overlapping ranges were found then stop
if (!rangeContent.Any())
{
ContentRangeHeaderValue actualContentRange = new ContentRangeHeaderValue(content.Length);
string msg = RS.Format(Resources.ByteRangeStreamNoneOverlap, range.ToString());
throw new InvalidByteRangeException(actualContentRange, msg);
}
}
else if (range.Ranges.Count == 1)
{
try
{
ByteRangeStream rangeStream = new ByteRangeStream(content, range.Ranges.First());
_byteRangeContent = new StreamContent(rangeStream, bufferSize);
_byteRangeContent.Headers.ContentType = mediaType;
_byteRangeContent.Headers.ContentRange = rangeStream.ContentRange;
}
catch (ArgumentOutOfRangeException)
{
ContentRangeHeaderValue actualContentRange = new ContentRangeHeaderValue(content.Length);
string msg = RS.Format(Resources.ByteRangeStreamNoOverlap, range.ToString());
throw new InvalidByteRangeException(actualContentRange, msg);
}
}
else
{
throw new ArgumentException(Resources.ByteRangeStreamContentNoRanges, "range");
}
// Copy headers from byte range content so that we get the right content type etc.
foreach (KeyValuePair<string, IEnumerable<string>> header in _byteRangeContent.Headers)
{
Headers.TryAddWithoutValidation(header.Key, header.Value);
}
_content = content;
_start = content.Position;
}
catch
{
if (_byteRangeContent != null)
{
_byteRangeContent.Dispose();
}
throw;
}
}
/// <summary>
/// <see cref="HttpContent"/> implementation which provides a byte range view over a stream used to generate HTTP
/// 206 (Partial Content) byte range responses. If none of the requested ranges overlap with the current extend
/// of the selected resource represented by the <paramref name="content"/> parameter then an
/// <see cref="InvalidByteRangeException"/> is thrown indicating the valid Content-Range of the content.
/// </summary>
/// <param name="content">The stream over which to generate a byte range view.</param>
/// <param name="range">The range or ranges, typically obtained from the Range HTTP request header field.</param>
/// <param name="mediaType">The media type of the content stream.</param>
/// <param name="bufferSize">The buffer size used when copying the content stream.</param>
public ByteRangeStreamContent(Stream content, RangeHeaderValue range, MediaTypeHeaderValue mediaType, int bufferSize)
{
if (content == null)
{
throw new ArgumentNullException("content");
}
if (!content.CanSeek)
{
throw new ArgumentException("content", RS.Format(Resources.ByteRangeStreamNotSeekable, typeof(ByteRangeStreamContent).Name));
}
if (range == null)
{
throw new ArgumentNullException("range");
}
if (mediaType == null)
{
throw new ArgumentNullException("mediaType");
}
if (bufferSize < MinBufferSize)
{
throw new ArgumentOutOfRangeException("bufferSize", bufferSize, RS.Format(Resources.ArgumentMustBeGreaterThanOrEqualTo, MinBufferSize));
}
if (!range.Unit.Equals(SupportedRangeUnit, StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(RS.Format(Resources.ByteRangeStreamContentNotBytesRange, range.Unit, SupportedRangeUnit), "range");
}
try
{
// If we have more than one range then we use a multipart/byteranges content type as wrapper.
// Otherwise we use a non-multipart response.
if (range.Ranges.Count > 1)
{
// Create Multipart content and copy headers to this content
MultipartContent rangeContent = new MultipartContent(ByteRangesContentSubtype);
_byteRangeContent = rangeContent;
foreach (RangeItemHeaderValue rangeValue in range.Ranges)
{
try
{
ByteRangeStream rangeStream = new ByteRangeStream(content, rangeValue);
HttpContent rangeBodyPart = new StreamContent(rangeStream, bufferSize);
rangeBodyPart.Headers.ContentType = mediaType;
rangeBodyPart.Headers.ContentRange = rangeStream.ContentRange;
rangeContent.Add(rangeBodyPart);
}
catch (ArgumentOutOfRangeException)
{
// We ignore range errors until we check that we have at least one valid range
}
}
// If no overlapping ranges were found then stop
if (!rangeContent.Any())
{
ContentRangeHeaderValue actualContentRange = new ContentRangeHeaderValue(content.Length);
string msg = RS.Format(Resources.ByteRangeStreamNoneOverlap, range.ToString());
throw new InvalidByteRangeException(actualContentRange, msg);
}
}
else if (range.Ranges.Count == 1)
{
try
{
ByteRangeStream rangeStream = new ByteRangeStream(content, range.Ranges.First());
_byteRangeContent = new StreamContent(rangeStream, bufferSize);
_byteRangeContent.Headers.ContentType = mediaType;
_byteRangeContent.Headers.ContentRange = rangeStream.ContentRange;
}
catch (ArgumentOutOfRangeException)
{
ContentRangeHeaderValue actualContentRange = new ContentRangeHeaderValue(content.Length);
string msg = RS.Format(Resources.ByteRangeStreamNoOverlap, range.ToString());
throw new InvalidByteRangeException(actualContentRange, msg);
}
}
else
{
throw new ArgumentException(Resources.ByteRangeStreamContentNoRanges, "range");
}
// Copy headers from byte range content so that we get the right content type etc.
foreach (KeyValuePair <string, IEnumerable <string> > header in _byteRangeContent.Headers)
{
Headers.TryAddWithoutValidation(header.Key, header.Value);
}
_content = content;
_start = content.Position;
}
catch
{
if (_byteRangeContent != null)
{
_byteRangeContent.Dispose();
}
throw;
}
}