public static IList<HttpBoundary> GetBoundaries(Stream stream)
{
if (stream == null)
throw new ArgumentNullException("stream");
var content = GetStreamContentAsString(stream);
var result = new List<HttpBoundary>();
var lines = content.Split(new[] { "\r\n" }, StringSplitOptions.None);
HttpBoundary currentBoundary = null;
var boundaryIsOpen = false;
var boundaryIsBinary = false;
String boundaryStartHeader = null;
for (var i = 0; i < lines.Length; i++)
{
var line = lines[i];
if (line.StartsWith("--", StringComparison.Ordinal))
{
boundaryStartHeader = line;
boundaryIsOpen = true;
currentBoundary = new HttpBoundary();
result.Add(currentBoundary);
}
else if (line.StartsWith("Content-Disposition", StringComparison.OrdinalIgnoreCase))
{
Debug.Assert(currentBoundary != null, "currentBoundary != null");
Debug.Assert(boundaryIsOpen == true, "boundaryIsOpen == true");
ParseDisposition(currentBoundary, line);
}
else if (line.StartsWith("Content-Type", StringComparison.OrdinalIgnoreCase))
{
Debug.Assert(currentBoundary != null, "currentBoundary != null");
Debug.Assert(boundaryIsOpen == true, "boundaryIsOpen == true");
boundaryIsBinary = ParseContentType(currentBoundary, line);
}
else if (line.Length == 0 && i < lines.Length - 1 && boundaryIsOpen)
{
var currentLine = lines[++i];
if (boundaryIsBinary)
{
var valueBuilder = new StringBuilder();
Debug.Assert(boundaryStartHeader != null, "boundaryStartHeader != null");
var boundaryEndHeader = String.Format(CultureInfo.InvariantCulture, "{0}--", boundaryStartHeader);
var notFirstLine = false;
while (currentLine != boundaryEndHeader)
{
if (notFirstLine)
valueBuilder.Append("\r\n"); /* We do not use AppendLine since we need "\r\n" always despite the platform. */
valueBuilder.Append(currentLine);
notFirstLine = true;
if (i < lines.Length - 1)
currentLine = lines[++i];
else
break;
}
currentBoundary.Value = valueBuilder.ToString();
boundaryIsBinary = false;
}
else
{
currentBoundary.Value = currentLine;
}
boundaryIsOpen = false;
}
}
return result;
}
private static void ParseDisposition(HttpBoundary currentBoundary, String line)
{
var regex = new Regex("Content-Disposition:\\s*(?<dispositionType>.+?);(?:\\s*(?<param>.+?)\\s*=\\s*\"(?<value>.+?)\"\\s*;?)*");
var match = regex.Match(line);
if (match != null)
{
var groups = match.Groups;
currentBoundary.DispositionType = groups["dispositionType"].Value;
var paramGroup = groups["param"];
var valueGroup = groups["value"];
for (var p = 0; p < paramGroup.Captures.Count; p++)
{
currentBoundary.Parameters.Add(
new HttpDispositionParameter()
{
Name = paramGroup.Captures[p].Value,
Value = valueGroup.Captures[p].Value
});
}
}
}
private static void ParseDisposition(HttpBoundary currentBoundary, String line)
{
Debug.Assert(_dispositionRegex != null, "_dispositionRegex != null");
var match = _dispositionRegex.Match(line);
if (match != null)
{
var groups = match.Groups;
currentBoundary.DispositionType = groups["dispositionType"].Value;
var paramGroup = groups["param"];
var valueGroup = groups["value"];
for (var p = 0; p < paramGroup.Captures.Count; p++)
{
currentBoundary.Parameters.Add(
new HttpDispositionParameter()
{
Name = paramGroup.Captures[p].Value,
Value = valueGroup.Captures[p].Value
});
}
}
}
private static Boolean ParseContentType(HttpBoundary currentBoundary, String line)
{
var regex = new Regex("Content-Type:\\s*(?<value>.+)");
var match = regex.Match(line);
if (match != null)
{
currentBoundary.ContentType = match.Groups["value"].Value;
return true;
}
return false;
}
private static Boolean ParseContentType(HttpBoundary currentBoundary, String line)
{
Debug.Assert(_contentTypeRegex != null, "_contentTypeRegex != null");
var match = _contentTypeRegex.Match(line);
if (match != null)
{
currentBoundary.ContentType = match.Groups["value"].Value;
return true;
}
return false;
}
